[go: up one dir, main page]

WO2016125250A1 - Électrode d'électrostimulation médicale - Google Patents

Électrode d'électrostimulation médicale Download PDF

Info

Publication number
WO2016125250A1
WO2016125250A1 PCT/JP2015/052955 JP2015052955W WO2016125250A1 WO 2016125250 A1 WO2016125250 A1 WO 2016125250A1 JP 2015052955 W JP2015052955 W JP 2015052955W WO 2016125250 A1 WO2016125250 A1 WO 2016125250A1
Authority
WO
WIPO (PCT)
Prior art keywords
elastic
linear
stimulation electrode
electrical stimulation
elastic member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2015/052955
Other languages
English (en)
Japanese (ja)
Inventor
直輝 大高
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Olympus Corp filed Critical Olympus Corp
Priority to PCT/JP2015/052955 priority Critical patent/WO2016125250A1/fr
Priority to JP2016572976A priority patent/JP6438497B2/ja
Publication of WO2016125250A1 publication Critical patent/WO2016125250A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/02—Details
    • A61N1/04—Electrodes
    • A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode

Definitions

  • the present invention relates to a medical electrical stimulation electrode.
  • the medical electrical stimulation electrode includes a stimulation electrode part and an elastic member that presses the stimulation electrode part against the inner wall of the blood vessel.
  • the elastic member is folded when an external force is applied, and is inserted into the blood vessel together with the stimulation electrode portion in the folded state.
  • the elastic member expands.
  • the stimulation electrode portion is pressed against the inner wall of the blood vessel.
  • the elastic member is locked to the blood vessel.
  • 6,057,836 discloses a conductive lead body having a proximal end configured to connect to a pulse generator and at least one electrode configured to deliver an electrical pulse across a vessel wall (stimulation electrode).
  • a nerve stimulation lead including a distal end portion including a portion and a lead anchor (elastic member).
  • the lead anchor in the nerve stimulation lead is configured to expand from a folded shape to an expanded shape formed in advance.
  • the distal end portion of the nerve stimulation lead is coupled to the outside of the lead anchor.
  • the lead anchor presses the tip of the nerve stimulation lead against the blood vessel wall. As a result, the position of the tip of the nerve stimulation lead in the blood vessel is fixed.
  • the stimulation electrode unit In order to appropriately perform electrical stimulation, the stimulation electrode unit needs to be accurately positioned at a stimulation site that appropriately stimulates a stimulation target such as a nerve.
  • a stimulation target such as a nerve.
  • the nerve stimulation lead described in Patent Document 1 is disposed on the inner wall of a blood vessel, it can be disposed at the stimulation site by rotating within the blood vessel.
  • Patent Document 1 describes that the distal end portion of the nerve stimulation lead is rearranged by reintroducing a guide member such as a guide catheter or a guide wire into the blood vessel and folding the lead anchor. .
  • the radial pressing force acting on the inner wall of the blood vessel from the distal end portion and the lead anchor of the nerve stimulation lead becomes uneven in the circumferential direction of the inner wall of the blood vessel.
  • the reaction force acting on each part of the lead anchor from the inner wall of the blood vessel also varies. Accordingly, there is a concern that the portion of the lead anchor that receives an excessive reaction force changes with time during the indwelling period, and the pressing force on the blood vessel wall further decreases.
  • the present invention has been made in view of the above problems, and an object thereof is to provide a medical electrical stimulation electrode that can be stably placed in a blood vessel even when folding is repeated.
  • the electrical stimulation electrode for medical use is formed in a closed loop by bending a linear elastic body, and a connection end where both ends of the linear elastic body are connected, and the connection end And a pair of first linear parts extending from the linearly spaced apart elastic body, and ends of the pair of first linear parts extending in the extending direction.
  • An elastic support having a plurality of elastic members each formed with a second linear portion including at least one bent portion in the middle, and at least one of the plurality of elastic members for applying electrical stimulation through the inner wall of the blood vessel.
  • a stimulating electrode portion arranged in one piece, a wiring electrically connected to the stimulating electrode portion, a linear extension, and the connecting end portions of the plurality of elastic members are connected to a tip member, respectively, And a lead portion through which the wiring is inserted.
  • the elastic support member is engaged with the plurality of elastic members at the first linear portion. Accordingly, an opening surrounding the central axis is formed by the linear elastic body including the second linear part, which is formed in a bowl shape centering on the central axis of the tip member of the lead part. Also good.
  • the elastic support may be formed in a rotationally symmetric shape with the central axis as the axis of symmetry.
  • the bent portion is a V-shaped first convex in a direction away from the connecting end portion. You may provide a bending part.
  • the bent portion is a V-shaped second convex in a direction approaching the connecting end portion. You may provide a bending part.
  • each of the plurality of elastic members covers a linear core material and the core material. And a covering member to be provided.
  • the core material may be a super elastic wire.
  • the plurality of elastic members are arranged such that the stimulation electrode portion is disposed and the wiring is incorporated. 1 and a second elastic member that does not have the stimulation electrode portion and the wiring, and the bending rigidity of the core material in the first elastic member is determined by the core in the second elastic member. By making it lower than the bending rigidity of the material, the elastic restoring force generated in the radial direction when the elastic support is reduced by a certain amount may be equalized.
  • the plurality of core members provided in the plurality of elastic members have two or more types having different bending rigidity.
  • the elastic restoring force generated in the radial direction may vary depending on the position in the circumferential direction.
  • the medical electrical stimulation electrode of the present invention has an effect that it can be stably placed in a blood vessel even if folding is repeated.
  • FIG. 6 is a F view in FIG. 5. It is a D view in FIG. 4B. It is the E view in FIG. 4B.
  • FIG. 11A It is a typical top view which shows the structure of the stimulation electrode part of the medical electrical stimulation electrode of embodiment of this invention. It is HH sectional drawing in FIG. 9A. It is JJ sectional drawing in FIG. 9A. It is KK sectional drawing in FIG. It is a G view in FIG. FIG. 11B is an LL sectional view in FIG. 11A. It is a schematic diagram which shows the external appearance of a patient when the medical electrical stimulation electrode of embodiment of this invention is detained in the patient's body. It is a schematic diagram which shows the state which indwelled the medical electrical stimulation electrode of embodiment of this invention in the superior vena cava.
  • FIG. 14A It is a schematic diagram which shows the state of the deformation
  • FIG. 1 is a schematic configuration diagram showing a configuration of a medical electrical stimulation electrode according to an embodiment of the present invention.
  • FIG. 2A is a schematic front view showing the configuration of the elastic support of the medical electrical stimulation electrode according to the embodiment of the present invention.
  • FIG. 2B is a side view as viewed in A in FIG. 2A.
  • FIG. 3 is a schematic perspective view showing the configuration of the elastic member of the medical electrical stimulation electrode according to the embodiment of the present invention.
  • 4A is a plan view as viewed from B in FIG. 4B is a side view as seen from C in FIG. 4A.
  • FIG. 1 is a schematic configuration diagram showing a configuration of a medical electrical stimulation electrode according to an embodiment of the present invention.
  • FIG. 2A is a schematic front view showing the configuration of the elastic support of the medical electrical stimulation electrode according to the embodiment of the present invention.
  • FIG. 2B is a side view as viewed in A in FIG. 2A.
  • FIG. 3 is a schematic perspective view showing the configuration of
  • FIG. 5 is a schematic front view showing the configuration of an example of the elastic member of the medical electrical stimulation electrode according to the embodiment of the present invention.
  • FIG. 6 is an F view in FIG.
  • FIG. 7 is a view as viewed from D in FIG. 4B.
  • FIG. 8 is an E view in FIG. 4B.
  • FIG. 9A is a schematic plan view showing the configuration of the stimulation electrode portion of the medical electrical stimulation electrode according to the embodiment of the present invention.
  • FIG. 9B is a cross-sectional view taken along line HH in FIG. 9A.
  • 10A is a cross-sectional view taken along line JJ in FIG. 9A.
  • 10B is a cross-sectional view taken along the line KK in FIG.
  • FIG. 11A is a G view in FIG.
  • FIG. 11B is a cross-sectional view taken along line LL in FIG. 11A.
  • An electrical stimulation system 100 shown in FIG. 1 is a system that applies electrical stimulation to surrounding nerve tissue through the inner wall of a blood vessel.
  • the electrical stimulation system 100 is inserted into a patient's blood vessel and left in place for a certain period.
  • the electrical stimulation system 100 is different from a system that performs nerve stimulation over a long period of time by implanting the entire system in the body.
  • the electrical stimulation system 100 is suitable for performing nerve stimulation for a short period of time.
  • the electrical stimulation system 100 includes the medical electrical stimulation electrode 1 of the present embodiment and the electrical stimulation device 8.
  • the medical electrical stimulation electrode 1 stimulates a nerve from within a blood vessel.
  • the electrical stimulation device 8 applies a stimulation pulse to the medical electrical stimulation electrode 1.
  • the medical electrical stimulation electrode 1 includes stimulation electrodes 21 and 22 (stimulation electrode portion), a lead portion 3, and an elastic support body 2.
  • the stimulation electrodes 21 and 22 apply electrical stimulation through the inner wall of the blood vessel.
  • the lead portion 3 is formed in a linear shape and passes through a wiring (not shown) electrically connected to the stimulation electrodes 21 and 22.
  • the elastic support 2 is connected to the tip member 3 b of the lead portion 3.
  • the medical electrical stimulation electrode 1 is introduced into a patient's blood vessel with the lead portion 3 inserted through a tubular guide sheath 7.
  • the distal end (front end portion) and the rear end (rear end portion) in the insertion direction with respect to the blood vessel of the patient are simply referred to as “front end”. (Front end) "and" rear end (rear end) ".
  • the elastic support body 2 When the elastic support body 2 reaches the indwelling position, the elastic support body 2 is pushed into the blood vessel from the distal end of the guide sheath 7. The elastic support 2 expands when pushed out, as will be described later. Thereby, the elastic support body 2 contacts the inner wall of the patient's blood vessel. The elastic support 2 is placed in the patient's blood vessel.
  • an antithrombotic coating is applied to a surface that comes into contact with blood on a member or a part inserted into a blood vessel of a patient in order to suppress thrombus generation.
  • a tube made of polyurethane or polyamide can be used as the guide sheath 7.
  • the dimensions of the tubular portion of the guide sheath 7 in the present embodiment are an outer diameter of 2.8 mm, an inner diameter of 2 mm, and a length of 300 mm.
  • a branch portion 7 b is provided at the rear end portion of the guide sheath 7.
  • a liquid feeding pipe 6 is connected to the side of the branch part 7b.
  • the liquid feeding tube 6 communicates with a conduit formed inside the guide sheath 7.
  • the liquid feeding tube 6 can continuously administer a drug solution such as heparin, which is an antithrombotic agent, into the guide sheath 7.
  • a seal part 7a made of an O-ring or the like is provided inside the branch part 7b.
  • the lead portion 3 is inserted through the seal portion 7a.
  • the seal portion 7 a maintains water tightness between the pipe line in the guide sheath 7 and the lead portion 3.
  • a connector 6a is provided at the end of the liquid feeding pipe 6 opposite to the branching portion 7b.
  • a liquid feeding means (not shown), for example, a luer lock connector for connecting a syringe piston pump or the like can be adopted.
  • the lead portion 3 includes a lead tube 3a that is a flexible tubular member. At both ends of the lead tube 3a, a hard tip member 3b and a hard branch part 3c to which the liquid feeding pipe 5 is connected are provided. The tip member 3 b is disposed at the first end that is the tip of the lead portion 3.
  • a wiring portion 3d is inserted into the lead tube 3a. The wiring part 3d is electrically connected to the stimulation electrodes 21 and 22. The wiring part 3d extends to the outside from the opening of the branch part 3c.
  • a connector 3e that is electrically connected to the electrical stimulation device 8 is coupled to the end of the wiring portion 3d in the extending direction. As the connector 3e, for example, a known IS1 type connector can be employed.
  • the lead tube 3a for example, a resin tube having an outer diameter of 1 mm to 3 mm and a total length of about 500 mm can be employed.
  • the resin used for the lead tube 3a is not particularly limited.
  • a polyurethane tube having excellent biocompatibility can be adopted as the lead tube 3a.
  • the outer diameter of the lead tube 3a is smaller than the inner diameter of the guide sheath 7 so that a gap is formed between the inner diameter of the guide sheath 7 and the guide sheath 7 can be fitted to the seal portion 7a of the guide sheath 7 so as to be able to advance and retract.
  • the outer diameter of the lead tube 3a is preferably about 2.5 mm.
  • the tip member 3 b is a tubular part that connects the elastic support 2.
  • the tip member 3b is connected to the tip of the lead tube 3a.
  • An engagement hole 3f extending toward the rear end is formed at the center of the front end of the front end member 3b.
  • the engagement hole 3f engages a converging portion 27 described later of the elastic support 2.
  • As the hole shape of the engagement hole 3f an appropriate shape capable of engaging the converging portion 27 around the central axis O can be adopted.
  • the engagement hole 3f is a hexagonal hole.
  • the hole center of the engagement hole 3f is coaxial with the central axis O.
  • the outer diameter of the tip member 3b is substantially the same (including the same case) as the outer diameter of the lead tube 3a.
  • the step on the outer peripheral surface of the tip member 3b is not less than 0 mm and not more than 0.2 mm. For this reason, the distal end member 3b can be inserted into the guide sheath 7 at the distal end portion of the guide sheath 7 so as to be able to advance and retract.
  • the tip member 3b is made of a titanium alloy.
  • As the hole shape of the engagement hole 3f a hexagonal hole is adopted corresponding to the outer shape of the converging portion 27 described later.
  • the lead portion 3 is inserted through the seal portion 7a at the rear end portion of the guide sheath 7 so as to be able to advance and retreat.
  • the rear end portion of the lead portion 3 is exposed to the outside of the guide sheath 7 through the seal portion 7a.
  • the branch portion 3 c is provided at the rear end portion of the lead portion 3 exposed to the outside of the guide sheath 7.
  • the liquid feeding pipe 5 communicates with a pipe line (not shown) in the lead portion 3.
  • the liquid feeding tube 5 can supply, for example, a chemical solution such as heparin, which is an antithrombotic agent, into the lead portion 3.
  • a discharge port (not shown) is formed at the tip of the lead part 3.
  • the drug solution supplied into the lead portion 3 through the liquid feeding tube 5 can be continuously administered into the blood vessel through emitted light (not shown).
  • a connector 5 a is provided at the end of the liquid feeding pipe 5 opposite to the lead portion 3.
  • a liquid feeding means for example, a luer lock connector for connecting a syringe piston pump or the like can be adopted.
  • the elastic support 2 includes elastic members 20A, 20B, and 20C that are formed in a closed loop by bending a linear elastic body.
  • the elastic members 20A, 20B, and 20C are formed in a bowl shape centered on a central axis O that is obtained by extending the central axis of the tip member 3b to the tip side.
  • the elastic members 20A, 20B, and 20C are combined while being shifted in the circumferential direction, and are formed in a bowl shape having rotational symmetry about the central axis O.
  • the circumferential direction is a direction around the central axis O.
  • the end (end portion) of the elastic support 2 connected to the lead portion 3 is referred to as a base end (base end portion) of the elastic support 2.
  • the end (end) opposite to the base end (base end) of the elastic support 2 is referred to as the tip (tip) of the elastic support 2.
  • an end (end part) close to the tip of the elastic support 2 is a tip (tip part) of each part, and an end (end part) close to the base end of the elastic support 2 is a base of each part. It is called the end (base end).
  • the elastic members 20 ⁇ / b> A, 20 ⁇ / b> B, and 20 ⁇ / b> C that are adjacent to each other in the circumferential direction are fixed by an elastic member fixing portion 34 (a knot portion) at an intermediate portion near the tip.
  • the base end portions of the elastic members 20A, 20B, and 20C are all bundled and fixed to form a converging portion 27 (nodule portion).
  • the outer shape of the elastic support 2 proceeds from the tip member 3b of the lead portion 3 toward the tip of the elastic support 2 along the central axis O (the left side in FIG. 2A). As the diameter gradually increases, the diameter becomes substantially constant, and further toward the tip, the diameter decreases.
  • the maximum outer diameter of the elastic support 2 is larger than the inner diameter of the blood vessel so that the inner wall of the blood vessel can be pressed in the blood vessel in which the elastic support 2 is placed.
  • the elastic support 2 is elastically deformable, but will be described below in a natural state unless otherwise specified.
  • the natural state of the elastic support 2 is an assembled state in which deformation is negligible even if an external force does not act or acts. Since the elastic support 2 is lightweight, deformation due to its own weight can be ignored within the scope of the following description.
  • the direction along the central axis O is the axial direction
  • the direction around the central axis O is the circumferential direction
  • the central axis O intersects the central axis O in a plane orthogonal to the central axis O.
  • the direction along the line is referred to as the radial direction.
  • the side closer to the distal end member 3b may be referred to as the proximal end side
  • the side farther from the distal end member 3b may be referred to as the distal end side.
  • a direction away from the central axis O may be referred to as a radial outer side (outer side), and a direction approaching the central axis O may be referred to as a radial inner side (inner side).
  • the elastic members 20A, 20B, and 20C have the same shape except that the stimulation electrodes 21 and 22 are disposed only on the elastic member 20A.
  • the shape of the elastic member 20A will be described, and the description of the elastic members 20B and 20C will be omitted by attaching a common reference numeral consisting of “numerals + lowercase letters” to the same shape portion. .
  • the subscripts A, B, and C are added after the lowercase letter of this symbol.
  • the connecting end 20aB (20aC) in the elastic member 20B (20C) refers to a portion having the same shape as the connecting end 20aA in the elastic member 20A.
  • the elastic member 20A is formed in a closed loop shape by bending a single linear elastic body.
  • the closed loop shape of the elastic member 20A is three-dimensional.
  • unit is demonstrated.
  • the natural state of the elastic member 20A alone is a state in which deformation is negligible even if an external force does not act or acts. As shown in FIG.
  • the elastic member 20 ⁇ / b> A includes a connecting end portion 20 a ⁇ / i> A, a base end side linear portion 20 b ⁇ / i> A (first linear portion) from the first end portion E ⁇ b> 1 of the linear elastic body toward the second end portion E ⁇ b> 2.
  • the bent portion 33fA first linear portion
  • the second linear portion 20cA the bent portion 33hA (first linear portion)
  • the proximal end linear portion 20dA first linear portion
  • connecting end portion 20eA are provided in this order.
  • the connecting end portions 20aA and 20eA are portions for fixing the elastic member 20A to the converging portion 27 described later and engaging the tip member 3b via the converging portion 27.
  • the connecting end portions 20aA and 20eA are each linearly extended along the first axis O1.
  • the connecting end portions 20aA and 20eA are arranged in parallel and close to each other across the first axis O1.
  • the coupling end portions 20aA and 20eA are engaged with the tip member 3b via the converging portion 27 so that the central axis O and the first axis O1 are coaxial.
  • the method for fixing the connecting end portions 20aA and 20eA and the converging portion 27 is not particularly limited.
  • the fixing method of the connecting end portions 20aA and 20eA and the converging portion 27 can be appropriately selected according to the material of the converging portion 27.
  • adhesion, welding, caulking, or the like can be adopted as a method for fixing the connecting end portions 20aA, 20eA and the converging portion 27.
  • the proximal end side linear portions 20bA and 20dA are U-shaped portions extending as a whole from the distal ends of the connecting end portions 20aA and 20eA.
  • the proximal end side linear portions 20bA and 20dA are disposed on a plane S2 including the first axis O1 and passing through the central axes of the coupling end portions 20aA and 20eA.
  • the proximal side linear portions 20bA and 20dA are symmetrical with respect to the first axis O1 in the plane S2. That is, as shown in FIG. 4A, the base-side linear portions 20bA and 20dA are inclined toward the distal end side (the left side in the drawing in FIG.
  • the proximal end side linear portions 20bA and 20dA are gradually separated from the first axis O1 toward the distal end side.
  • the proximal end side linear portions 20bA and 20dA are substantially parallel to the first axis O1 (including the parallel case) at the respective distal end portions.
  • the proximal-side linear portion 20bA (20dA) can be configured by a curved portion, a broken line portion, or a combination of the curved portion and the broken line portion that protrudes in a direction away from the first axis O1.
  • the shape of the proximal-side linear portion 20bA (20dA) adopts a curved shape in which the average change rate of the inclination with respect to the first axis O1 varies between the proximal end portion and the distal end portion.
  • the average change rate of the inclination with respect to the first axis O1 is larger in the proximal side region b1 (d1) of the proximal side linear portion 20bA (20dA) than in the distal side region b2 (d2). .
  • the change in curvature in the path from the base end region b1 (d1) to the second linear portion 20cA may be continuous or discontinuous.
  • the curvature at the boundary between the first linear portion 20cA and the second linear portion 20cA may be continuous or discontinuous.
  • the curvature and direction at the distal end portions of the proximal end linear portions 20bA and 20dA can be appropriately set in consideration of the deformation state in the blood vessel at the indwelling position and the pressing force against the inner wall of the blood vessel.
  • the base end side linear portions 20bA and 20dA adopt a shape that is inclined so as to be separated from each other toward the tip. For this reason, the distal ends of the base end side linear portions 20bA and 20dA are most separated in the direction perpendicular to the first axis O1 in the natural state.
  • the bent portion 33hA is formed in a U-shape between the distal end of the proximal end side linear portion 20dA and the proximal end of a second linear portion 20cA described later.
  • the bent portion 33hA protrudes on the opposite side to the second linear portion 20cA with respect to the plane S2.
  • the “U-shape” is not limited to a shape in which two parallel straight portions are connected by an arcuate curved portion.
  • the two straight portions may be parallel to each other non-parallel.
  • the bending portion may be curved with a curve other than the arc.
  • the bending portion may be constituted by a broken line made of a straight line or a curved line.
  • the curved portion may be replaced with a straight portion.
  • the shape composed of one straight line portion bent at the ends of two straight line portions is also “U-shaped”.
  • the bent portion 33hA of the present embodiment includes a first portion h1, a second portion h2, and a third portion h3.
  • the first portion h1 is a linear portion that is bent at the tip of the proximal end linear portion 20dA.
  • the first portion h1 may be linear or curved.
  • the first portion h1 is linear as an example.
  • An example of the bending angle ⁇ 1 of the first portion h1 can be in the range of 90 ° ⁇ 30 °.
  • the length of the first portion h ⁇ b> 1 is longer than the longitudinal direction of the stimulation electrode 22. Examples of the length of the first portion h1 include 4.5 mm or more and 7.0 mm or less.
  • the bending angle ⁇ 1 is a smaller angle (an angle measured in the bending) among the angles formed by the first portion h1 and the distal end portion of the proximal end linear portion 20dA.
  • the second portion h2 is a linear portion that is bent at the tip in the protruding direction of the first portion h1.
  • the second portion h2 extends in parallel to the plane S2 at a position (see FIG. 4A) that is on the extension line of the proximal end side linear portion 20dA when viewed from the normal direction of the plane S2.
  • the second portion h2 may be linear or curved.
  • the second portion h2 is linear as an example. Examples of the length of the second portion h2 include 3.0 mm or more and 7.0 mm or less.
  • the third portion h3 is a linear portion that is bent at the distal end in the extending direction of the second portion h2 and connected to the base end of the second linear portion 20cA described later.
  • the third portion h3 may be linear or curved.
  • the third portion h3 is linear as an example.
  • Examples of the bending angle ⁇ 2 of the third portion h3 include a range of 90 ° ⁇ 30 ° (range of 60 ° or more and 120 ° or less).
  • the bending angle ⁇ 2 is a smaller angle (an angle measured in the bending) among the angles formed by the third portion h3 and the second portion h2.
  • the tip of the third portion h3 is located on the plane S2 in the present embodiment.
  • the connecting portion between the third portion h3 and the second linear portion 20cA is drawn to be bent.
  • whether or not the connection portion is bent as shown in the drawing is determined by the bending angle ⁇ 2 and the angle ⁇ with respect to the plane S2 of the second linear portion 20cA described later. It is not essential that the connecting portion bends.
  • the base end portion of the second linear portion 20cA described later is seen from the direction along the first axis O1 (see FIG.
  • the plane S1 is a plane that includes the first axis O1 and is orthogonal to the plane S2.
  • the base end portion of the second linear portion 20cA is inclined inward (near the center in FIG. 4B) by an angle ⁇ with respect to the normal line of the plane S2. Further, when viewed from the direction along the normal line of the plane S2 (see FIG. 4A), the base end portion of the second linear portion 20cA is bent in the direction toward the plane S1 toward the distal end side.
  • the distal end portion of the third portion h3 and the proximal end portion of the second linear portion 20cA are bent in a V shape when viewed as a three-dimensional shape. ing. Further, the distal end portion of the third portion h3 and the proximal end portion of the second linear portion 20cA are bent even when viewed along the normal line of the plane S2.
  • a bent portion formed by the distal end portion of the third portion h3 and the proximal end portion of the second linear portion 20cA is hereinafter referred to as a bent portion 20hA.
  • the stimulation electrode 22 is disposed on the first portion h1.
  • a stimulation electrode 21 is disposed on the third portion h3.
  • the stimulation electrode 22 is disposed at an intermediate portion of the first portion h1 so that the longitudinal direction thereof is along the central axis direction of the first portion h1.
  • a part of the stimulation electrode 22 is exposed on the surface that is radially outward with respect to the first axis O1.
  • the stimulation electrode 21 is disposed at an intermediate portion of the third portion h3 so that the longitudinal direction thereof is along the central axis direction of the third portion h3.
  • a part of the stimulation electrode 21 is exposed on the surface that is radially outward with respect to the first axis O1.
  • the position of the stimulation electrode 22 (21) in the central axis direction in the first portion h1 (third portion h3) is not particularly limited as long as electrical stimulation can be applied to the nerve tissue to be stimulated.
  • a stimulation electrode may be installed in the second portion h2 in FIG. 5, and another stimulation electrode may be installed in the second portion h2 of the bent portion 33fA described later.
  • the stimulation electrode when each stimulation electrode is inserted into the blood vessel, the stimulation electrode can be arranged in parallel with the running of the vagus nerve P6. Moreover, it can arrange
  • the detailed configuration of the stimulation electrodes 21 and 22 will be described after the elastic member 20A is further described.
  • bent portion 33hA has been described above.
  • the bent portion 33hB (33hC) of the elastic member 20B (20C) is configured in the same manner as the bent portion 33hA, except that the stimulation electrodes 21 and 22 are omitted.
  • the bent portion 33fA of the elastic member 20A will be described. As shown in FIG. 8, the bent portion 33fA is formed in a U-shape between the distal end of the proximal end side linear portion 20bA and the proximal end of a second linear portion 20cA described later. Similar to the bent portion 33hA, the bent portion 33fA protrudes on the opposite side to the second linear portion 20cA with respect to the plane S2.
  • the bent portion 33fA of the present embodiment includes a first portion f1, a second portion f2, and a third portion f3.
  • the outer shape of the bent portion 33fA may be different from the bent portion 33hA provided at a position facing the plane S1 (see FIG. 3).
  • the outer shape of the bent portion 33fA is plane-symmetric with the bent portion 33hA with respect to the plane S1. That is, the first part f1, the second part f2, and the third part f3 have the same outer shape as the first part h1, the second part h2, and the third part h3 in the bent part 33hA, respectively.
  • a bent portion 20fA similar to the bent portion 20hA is formed by the tip portion of the third portion h3 and the second linear portion 20cA.
  • the stimulation electrodes 21 and 22 are not arranged in the bent portion 33fA.
  • the tip of the third portion h3 of the bent portion 33hA and the tip of the third portion f3 of the bent portion 33fA are located on the third axis O3 orthogonal to the first axis O1 on the plane S2.
  • bent portion 33fA has been described above. As shown in FIG. 8, the bent portion 33fB (33fC) of the elastic member 20B (20C) is configured similarly to the bent portion 33fA.
  • the base end side linear portion 20d and the bent portion 33h, and the base end side linear portion 20b and the bent portion 33f described above are a pair in which linear elastic bodies are extended away from the connecting end portions 20a and 20e, respectively. 1st linear part is comprised.
  • the second linear portion 20cA is a portion that is connected at both ends to the ends of the extending direction of the pair of first linear portions and includes at least one bent portion in the middle between both ends. As shown in FIGS. 5 and 8, in the present embodiment, the second linear portion 20cA gradually moves away from the plane S2 from the tip of the third portions f3 and h3 in the bent portions 33fA and 33hA toward the tip side. It is extended in an oblique direction. As shown in FIG. 4A, the second linear portion 20cA is curved in a convex shape projecting toward the tip as a whole.
  • the second linear portion 20cA can be configured by a curved portion, a broken line portion, or a combination of the curved portion and the broken line portion that protrudes in a direction away from the third axis O3.
  • the shape of the second linear portion 20cA is formed in a C shape or a mountain shape that is plane-symmetric with respect to the plane S1.
  • the second linear portion 20cA is inclined toward the plane S1 from the tip of the third portion f3 (h3) of the bent portion 33fA (33hA) in the proximal region c1 (c3) close to the bent portion 33fA (33hA). It is extended in the shape of a curve or a straight line.
  • a bent portion 20kA in which the linear linear portion is bent at the top portion 20gA is formed at the center of the distal end side region c2 between the proximal end side regions c1 and c3. .
  • the top portion 20gA is located on the plane S1.
  • the bent portion 20kA constitutes a V-shaped first bent portion that is convex in a direction away from the connecting end portions 20aA and 20eA.
  • the bending angle of the bent portion 20kA is ⁇ 3.
  • the bending angle ⁇ 3 may be an obtuse angle or an acute angle. Examples of the bending angle ⁇ 3 include a range of 5 ° to 120 °. Within the bend of the bent portion 20 kA, there may be a curvature with a radius of curvature of 5 mm or less formed for processing convenience.
  • the shape of the distal end side region c2 excluding the bent portion 20kA may be a curved shape or a linear shape.
  • the shape of the distal end side region c2 excluding the bent portion 20kA is, for example, a curved shape protruding outward in the radial direction with respect to the first axis O1.
  • the plane S3 is a virtual plane that includes the third axis O3 and intersects the plane S2 at an angle ⁇ .
  • the angle ⁇ may be, for example, 5 ° or more and 90 ° or less.
  • the bent portion 20kA is inclined by an angle ⁇ 2 closer to the plane S2 than the plane S3.
  • the angle ⁇ 2 may be an angle at which each apex 20gA contacts the inner wall of the blood vessel in a deformed state in which the elastic support 2 is inserted into the blood vessel.
  • the angle ⁇ 2 may be an angle at which each apex 20gA does not contact the inner wall of the blood vessel.
  • the magnitude of the angle ⁇ 2 can be, for example, 5 ° or more and 90 ° or less.
  • bent portions 20jA are formed at the connection portions between the base end portion of the bent portion 20kA and the second linear portion 20cA excluding the bent portion 20kA.
  • the angle ⁇ 2 may be 0 ° or an angle inclined to the opposite side with respect to the plane S3.
  • the top portion 20gA is strongly pressed against the inner wall of the blood vessel.
  • the entire outer shape of the elastic member 20A is symmetrical with respect to the plane S1.
  • the elastic member 20A As shown in FIGS. 9A and 9B, in the elastic member 20A, the outer peripheral surface of the wire 23X (core material), which is a linear elastic body, is covered with an outer covering 26 (covering member).
  • the wire 23X an appropriate metal wire that hardly causes plastic deformation can be adopted.
  • the metal wire suitable as the wire 23X include a shape memory alloy and a superelastic wire.
  • the cross-sectional shape in a direction orthogonal to the longitudinal direction of the wire 23X (hereinafter simply referred to as a cross-sectional shape) is not particularly limited.
  • a rectangular cross section or a circular cross section can be employed.
  • the cross-sectional shape of the wire 23X include, for example, a square cross section or a rectangular cross section with a side length of 0.1 mm to 0.3 mm, and a circular cross section with a diameter of 0.1 mm to 0.3 mm. be able to.
  • the cross-sectional shape of the wire 23X is a square.
  • the wire 23X employs a superelastic wire of 0.27 mm ⁇ 0.27 mm as an example.
  • the outer covering 26 is a covering member that forms the outermost peripheral surface of the elastic member 20 ⁇ / b> A except for the exposed portions of the stimulation electrodes 21 and 22. Therefore, when the outer covering 26 is introduced into the blood vessel, the outer peripheral surface comes into contact with blood, a living tissue such as the inner wall of the blood vessel. For this reason, the outer covering 26 is formed of an insulating material that can be deformed together with the wire 23X and is excellent in biocompatibility. The surface of the outer coating 26 is formed smoothly so as not to cause thrombus. Examples of a material suitable for the outer coating 26 include a polyurethane resin and a polyimide resin. The outer covering 26 is melt-bonded so as not to include an air layer with the wire 23X by heat fusion.
  • the stimulation electrodes 21 and 22 differ only in the arrangement position in the elastic member 20A, and both have the same configuration.
  • the stimulation electrode 21 (22) is formed of a metal tube having biocompatibility such as a platinum iridium alloy, for example.
  • a part of the stimulation electrode 21 (22) is exposed to the outer periphery of the elastic member 20A through the opening 26a of the outer covering 26.
  • the exposed portion has a cylindrical surface shape having a curvature along the outer peripheral surface of the outer coating 26.
  • the shape of the exposed portion viewed from the direction along the third axis O3 is substantially rectangular (including a rectangular shape).
  • a cylindrical tube member having a diameter of 0.8 mm and a length of 4 mm is employed as the stimulation electrode 21 (22).
  • the shape of the exposed portion of the stimulation electrode 21 (22) is 0.5 mm wide and 3.8 mm long.
  • the longitudinal direction of the exposed portion coincides with the extending direction of the outer coating 26.
  • the exposed shape of the stimulation electrode 21 (22) is not limited to this.
  • the exposed shape of the stimulation electrode 21 (22) may be an oval shape or an oval shape that is long in the axial direction of the wire 23X.
  • a tubular insulating member 24 for preventing a short circuit with the wire 23X is inserted into the stimulation electrode 21 (22).
  • a wire 23 ⁇ / b> X is inserted into the insulating member 24.
  • a wiring 25 is electrically connected to the inner peripheral surface of the stimulation electrode 21 (22) buried in the outer covering 26.
  • the wiring 25 constitutes a wiring part 3d (see FIG. 1).
  • As the wiring 25, for example, a stranded wire made of a nickel cobalt alloy (35NLT25% Ag material) having bending resistance is covered with an electrical insulating material (for example, ETFE (polytetrafluoroethylene) having a thickness of 20 ⁇ m).
  • ETFE polytetrafluoroethylene
  • the internal structure of the elastic members 20B and 20C includes a wire 23Y (core material) instead of the wire 23X of the elastic member 20A, and includes stimulation electrodes 21 and 22, an insulating member 24, and wiring 25. It is a deleted configuration.
  • the wire 23Y is made of the same material as the wire 23X. However, the wire 23Y may be different from the cross-sectional shape of the wire 23X.
  • Examples of the cross-sectional shape of the wire 23Y include, for example, a square cross section or a rectangular cross section with a side length of 0.2 mm to 0.5 mm, and a circular cross section with a diameter of 0.2 mm to 0.5 mm. be able to.
  • the cross-sectional shape of the wire 23Y is a square.
  • the wire 23Y employs a super-elastic wire of 0.27 mm ⁇ 0.27 mm, similar to the wire 23X.
  • the elastic member 20B (20C) does not have the wiring 25. Therefore, the elastic member 20B (20C) does not contribute to the bending rigidity due to the wiring 25. For this reason, if the cross-sectional shape orthogonal to the longitudinal direction of the wire 23Y (hereinafter simply referred to as the cross-sectional shape) is the same cross-sectional shape as the wire 23X, the bending rigidity of the elastic member 20B (20C) is greater than the bending rigidity of the elastic member 20A. descend. If the cross-sectional shape of the wire 23Y is changed so that the cross-sectional secondary moment related to bending is greater than that of the wire 23X, the bending rigidity of the elastic members 20A, 20B, and 20C can be made substantially the same.
  • the cross-sectional shape orthogonal to the longitudinal direction of the wire 23Y hereinafter simply referred to as the cross-sectional shape
  • the bending rigidity of the elastic member 20B (20C) is greater than the bending rigidity of the elastic member 20A. descend.
  • the bending rigidity of the elastic members 20A, 20B, and 20C becomes approximately the same without changing the bending rigidity of the wires 23X and 23Y.
  • the cross-sectional secondary moments of the wires 23X and 23Y are the same, but the bending rigidity of the elastic members 20A, 20B, and 20C is approximately the same.
  • the bending stiffnesses of the elastic members 20A, 20B, and 20C do not need to be strictly matched.
  • the flexural rigidity of each of the elastic members 20A, 20B, and 20C is such that the elastic restoring force generated in the radial direction when the elastic support 2 is reduced by a certain amount after being assembled as the elastic support 2 can be equalized.
  • “can be equalized” means that the variation in elastic restoring force is within 10%.
  • the elastic members 20A, 20B, and 20C are arranged rotationally symmetrical. For this reason, if the variation of each bending rigidity of elastic member 20A, 20B, 20C is kept to 10% or less, the elastic restoring force in the elastic support body 2 can be equalized.
  • the elastic restoring force at the time of diameter reduction can be equalized.
  • a certain amount when measuring the elastic restoring force can be appropriately set to a value. For example, a value close to the amount of diameter reduction when placed in the blood vessel may be used. In this case, the measured elastic restoring force is substantially equal to the pressing force acting on the blood vessel.
  • the elastic member 20 ⁇ / b> A constitutes a first elastic member in which a stimulation electrode portion is disposed and a wiring is incorporated.
  • the elastic members 20B and 20C constitute a second elastic member having no stimulation electrode portion and wiring.
  • Such elastic members 20A, 20B, and 20C are assembled as the elastic support 2.
  • the arrangement of the elastic members 20A, 20B, and 20C in the natural state of the assembled elastic support 2 will be described.
  • the elastic members 20A, 20B, and 20C have the first axis O1 aligned with the center axis O.
  • the top portions 20gA, 20gB, and 20gC are spaced apart at equal intervals in the circumferential direction with respect to the central axis O.
  • the projecting direction of the second linear portion 20 c is directed radially outward with respect to the central axis O.
  • the arrangement order of the elastic members 20 is the order of the elastic members 20A, 20B, and 20C in the counterclockwise direction in the drawing.
  • the base end side linear portions 20bA and 20dB, the base end side linear portions 20bB and 20dC, and the base end side linear portions 20bC and 20dA are respectively located on the base end side by the elastic member fixing portion 64. It is fixed.
  • the position and length of the elastic member fixing portion 64 can be appropriately set in consideration of the balance of the pressing force during deformation.
  • the base end side linear portions 20bA and 20dB, the base end side linear portions 20bB and 20dC, and the base end side linear portions 20bC and 20dA are not limited to the base end side, but the entire longitudinal direction is caused by the elastic member fixing portion 64. It may be fixed.
  • each base end side linear part 20b, 20d may be fixed by the elastic member fixing part 64.
  • the range from the distal end member 3b side to 2/3 is fixed in each of the proximal end side linear portions 20b and 20d.
  • Each elastic member fixing portion 64 can be formed by fusing and welding the outer coverings 26 of each elastic member 20 or bonding them with an adhesive or the like.
  • the length and forming method of the elastic member fixing portion 64 are not limited to the above.
  • fixed part 64 may be provided in the some dot form spaced apart in the longitudinal direction of each base end side linear part 20b, 20d.
  • the bent portions 33fA and 33hB, the bent portions 33fB and 33hC, and the bent portions 33fC and 33hA have U-shaped openings facing each other.
  • Adjacent second linear portions 20c intersect each other.
  • Adjacent second linear portions 20c are fixed by elastic member fixing portions 34 (nodal portions) at positions where they intersect each other.
  • the proximal end side linear portions 20b and 20d of the adjacent elastic members are fixed to each other by the elastic member fixing portion 64, the proximal end side linear portions 20b, Even if 20d is deformed, the shape of the pressing portion 35 is less likely to change when viewed from the outside in the radial direction. For this reason, the press range by the press part 35 can be stabilized.
  • LP is formed (see FIG. 2B).
  • the circular path LP is a path that passes through the elastic member fixing portion 34 that is separated from the central axis O once and closes around the central axis O.
  • a linear portion constituting a part of the circulation path LP is hereinafter referred to as a circumferential line portion CL.
  • the circumferential line-shaped portion CL includes bent portions 20 kA, 20 kB, and 20 kC.
  • the circuit path LP forms an opening surrounding the central axis O in the elastic support 2 by a linear elastic body including the second linear portion.
  • each elastic member fixing portion 34 may be formed by fusing and welding the outer coverings 26 of each elastic member 20.
  • Each elastic member fixing portion 34 may be formed by bonding the outer coverings 26 of the respective elastic members 20 using an adhesive.
  • the circulation path LP is formed in a shape that does not protrude from the cylindrical surface C0 in the natural state of the elastic support body 2.
  • the cylindrical surface C0 is a virtual cylindrical surface that extends along the central axis O through the elastic member fixing portion 34.
  • each bending part 33h and 33f are located in the radial direction outer side of the cylindrical surface C0.
  • the bent portions 33 h and 33 f constitute the outermost peripheral portion of the elastic support 2.
  • the diameter of the circumscribed cylindrical surface C1 of each of the bent portions 33h and 33f is larger than the inner diameter of the blood vessel into which the elastic support body 2 is inserted.
  • each of the bent portions 33h and 33f is a portion that presses the inner wall of the blood vessel outward in the radial direction according to the deformation amount when the elastic support 2 is deformed in the blood vessel.
  • each pressing portion 35 the bent portions 33 h and 33 f that are fixed by the elastic member fixing portion 34 and make a pair are referred to as a pressing portion 35.
  • the first portions h 1, f 1 and the third portions h 3, f 3 are extended substantially along the circumferential direction of the elastic support 2.
  • the second portions h ⁇ b> 2 and f ⁇ b> 2 are separated from each other in the circumferential direction and extend substantially parallel to the axial direction.
  • the base end of each pressing portion 35 is connected to the base end side linear portions 20d and 20b that curve inward in the radial direction toward the base end of the elastic support body 2, respectively.
  • the connecting end portions 20aA, 20eA, 20aB, 20eB, 20aC, and 20eC connected to the base ends of the base end side linear portions 20bA, 20dA, 20bB, 20dB, 20bC, and 20dC are integrated by the converging portion 27. It is bundled and fixed.
  • the converging part 27 is formed by inserting each connecting end part 20a and each connecting end part 20e into a tubular member made of a titanium alloy, followed by caulking.
  • the outer shape of the converging portion 27 is a hexagonal column shape that can be fitted into the engagement hole 3f.
  • the converging part 27 is inserted into a hexagonal engagement hole 3f formed coaxially with the central axis O in the tip member 3b and engaged in the circumferential direction.
  • the focusing portion 27 is fixed to the tip member 3b by, for example, adhesion.
  • the converging portion 27 and the tip member 3b are in a relationship between the shaft portion and the hole portion having hexagonal cross sections that are fitted to each other.
  • the converging part 27 and the tip member 3b are engaged around the central axis O so as not to rotate. For this reason, when the lead part 3 is rotated around the central axis O, the elastic support 2 also rotates around the central axis O according to the rotation angle of the lead part 3.
  • the wiring 25 extending from the connecting end portions 20aA and 20eA passes through the interior of the distal end member 3b and extends into the lead tube 3a.
  • the wiring 25 is grouped as a wiring part 3d inside the lead tube 3a.
  • the position of the wiring portion 3d is fixed by a fixing portion 3g in the lead tube 3a and extends to the rear end portion of the lead tube 3a.
  • the wiring part 3d extends to the outside from the branch part 3c (see FIG. 1).
  • each base end side linear portion 20b and each base end side linear portion 20d can be formed by rotating a U-shape around the central axis O. They are arranged along a semi-spindle shape.
  • Each pressing portion 35 constitutes the outermost peripheral portion in the intermediate portion in the axial direction.
  • Each second linear portion 20c on the distal end side of each elastic member fixing portion 34 is disposed along a shape that decreases in diameter toward the central axis O toward the distal end side.
  • each elastic member 20 In the natural state of the assembled state of the elastic support 2 described above, no external force other than gravity acts on the elastic support 2. Since each elastic member 20 is lightweight, deformation of the elastic support 2 due to gravity can be ignored. However, the elastic members 20A, 20B, and 20C intersect each other, and are fixed to each other by the elastic member fixing portion 34 at the intersecting positions. By being restrained in this way, the elastic member 20 receives an external force from the other elastic members 20. Therefore, in the natural state of the assembled state of the elastic support body 2, each elastic member 20 is deformed into a shape different from the shape of the single natural state.
  • the electrical stimulation device 8 is a device portion that generates electrical stimulation between the pair of stimulation electrodes 21 and 22 based on the operation of the operator when the medical electrical stimulation electrode 1 is placed in a blood vessel.
  • the power supply and the control part are provided at least.
  • the power supply outputs a pulsed signal waveform.
  • a control part produces
  • the electrical stimulation device 8 is electrically connected to the wiring portion 3 d in the lead portion 3 via a connector 3 e.
  • the signal waveform output from the electrical stimulation device 8 is generated with a constant current system or a constant voltage system biphasic waveform group with a predetermined interval.
  • the condition of the signal waveform can be appropriately set as necessary for electrical stimulation. Specifically, for example, it is possible to output a signal waveform such as generating a biphasic waveform with a frequency of 20 Hz and a pulse width of 50 ⁇ sec to 400 ⁇ sec from 3 to 20 seconds per minute. is there.
  • a signal waveform such as generating a biphasic waveform with a frequency of 20 Hz and a pulse width of 50 ⁇ sec to 400 ⁇ sec from 3 to 20 seconds per minute. is there.
  • one of the stimulation electrodes 21 and 22 acts as a plus side electrode, and the other acts as a minus side electrode.
  • FIG. 12 is a schematic view showing a state outside the patient's body when the medical electrical stimulation electrode according to the embodiment of the present invention is placed in the patient's body.
  • FIG. 13 is a schematic view showing a state in which the medical electrical stimulation electrode according to the embodiment of the present invention is placed in the superior vena cava.
  • FIG. 14A is a schematic diagram showing a state of deformation in the blood vessel of the elastic support of the medical electrical stimulation electrode according to the embodiment of the present invention.
  • 14B is a side view of the M view in FIG. 14A.
  • FIG. 15A is a side view showing the shape of the elastic support of the medical electrical stimulation electrode according to the embodiment of the present invention in a reduced diameter state.
  • FIG. 15B is a side view showing the natural shape of the elastic support of the medical electrical stimulation electrode according to the embodiment of the present invention.
  • the surgeon cuts the vicinity of the neck of the patient P to form an opening P1.
  • a known introducer or dilator (not shown) is attached to the opening P 1, and the medical electrical stimulation electrode 1 accommodated in the guide sheath 7 is introduced together with the guide sheath 7.
  • the medical electrical stimulation electrode 1 is introduced while confirming the positions of the wires 23X and 23Y, the wiring 25, the elastic support 2 (all not shown in FIG. 12) and the like under the X-ray.
  • the distal end of the guide sheath 7 reaches the vicinity of the indwelling position in the superior vena cava P3 (blood vessel) through the right external jugular vein P2 (blood vessel), the elastic support 2 is pushed out of the guide sheath 7.
  • the elastic support body 2 pushed into the superior vena cava P3 expands in the superior vena cava P3 in order to return to the natural state by the elastic restoring force. Since the outer diameter of the elastic support 2 in the natural state is smaller than the inner diameter of the superior vena cava P3, the elastic support 2 is pressed against the inner wall V1 of the superior vena cava P3. Thereby, the elastic support body 2 is elastically deformed by the reaction from the inner wall V1. The elastic support body 2 is reduced in diameter to be smaller than the natural state.
  • the inner wall V ⁇ b> 1 is in close contact with the outer peripheral portion of the elastic support 2 while being deformed by receiving a pressing force from the elastic support 2. For this reason, the elastic support body 2 is locked to the inner wall V1 of the superior vena cava P3 in contact with the frictional force.
  • an electrical stimulation is applied to the stimulation electrodes 21 and 22, and for example, an appropriate indwelling position is searched while monitoring the heart rate of the patient P. Perform a search action.
  • the surgeon corrects the indwelling position of the elastic support 2 as necessary. If the lead portion 3 is rotated, the elastic support 2 is rotated together with the lead portion 3. For this reason, the surgeon can adjust the positions of the stimulation electrodes 21 and 22 in the circumferential direction in the superior vena cava P3.
  • the guide sheath 7 is pulled out to the proximal end side, and only the medical electrical stimulation electrode 1 is left in the blood vessel as shown in FIG. In this way, the placement of the elastic support 2 is completed.
  • the electrical stimulation apparatus 8 will apply electrical stimulation at an appropriate timing. Thereby, the electrical stimulation required for the vagus nerve P6 of the patient P can be applied via the inner wall V1.
  • the medical electrical stimulation electrode 1 is pulled out in the direction opposite to the inserted path.
  • the medical electrical stimulation electrode 1 is extracted out of the body of the patient P.
  • the elastic support body 2 has a shape along the semi-spindle shape whose outer peripheral portion is reduced in diameter toward the tip member 3b, it can be pulled out smoothly.
  • FIGS. 14A and 14B An example of the deformation state of the elastic support 2 is shown in FIGS. 14A and 14B.
  • the elastic support body 2 comes into contact with the inner wall V1 from a portion that is the outermost peripheral portion in the radial direction, and receives a reaction radially inward from these contact portions.
  • the elastic members 20A, 20B, and 20C are deformed. That is, first, each pressing portion 35 comes into contact with the inner wall V1 and is pressed radially inward. Thereby, each circumferential line-shaped portion CL is compressed radially inward via each elastic member fixing portion 34.
  • FIG. 14B it is schematically drawn in order to avoid the overlap of the lines and make the illustration easy to see.
  • FIG. 15A and 15B which represented more precisely the diameter-reduced state which inserted the elastic support body 2 in M view of FIG. 14A, and the natural state seen from the same direction.
  • the diameter of the elastic support 2 is reduced according to the inner wall V1 of the superior vena cava P3 until the outermost peripheral portion is inscribed in a virtual cylindrical surface C4 coaxial with the central axis O.
  • each pressing portion 35 is inscribed in the cylindrical surface C4.
  • the base end portion of the second linear portion 20c of each pressing portion 35 is connected to each bending portion 33h (33f) via the bending portion 20h (20f) and extends toward the radially inner side. Yes.
  • intersect is located on the virtual cylindrical surface C3 smaller in diameter than the cylindrical surface C4.
  • each pressing portion 35 is inscribed in the circumscribed cylindrical surface C1, and each elastic member fixing portion 34 is a virtual cylindrical surface C0 having a smaller diameter than the circumscribed cylindrical surface C1. Corresponds to being located above.
  • each pressing portion 35 is pressed radially inward from the natural state to reduce the diameter, the distance between the bent portions 20h and 20f that are both ends of each second linear portion 20c is reduced (see the arrow in FIG. 15B).
  • the second linear portion 20c is bent around the top portion 20g by an external force acting on both ends of the second linear portion 20c.
  • the top portion 20g of the second linear portion 20c moves radially outward (see the white arrow in FIG. 15B).
  • the bending angles of the bent portions 20 h and 20 f tend to be slightly larger than the natural state of the elastic support 2.
  • the state where the bent portions 20h and 20f are bent is maintained.
  • the positional relationship in which each elastic member fixing portion 34 is located radially inward from the cylindrical surface where the bent portions 20h and 20f are located is maintained. Therefore, the diameter of the cylindrical surface C3 in the reduced diameter state is smaller than the diameter of the cylindrical surface C4.
  • the diameter difference between the cylindrical surfaces C4 and C3 is smaller than the diameter difference between the circumscribed cylindrical surface C1 and the cylindrical surface C0.
  • each apex 20g moves radially outward along with the diameter reduction of the elastic support 2, and therefore protrudes radially outward from the cylindrical surface C3 depending on the position of the elastic member fixing portion 34.
  • each top 20g may move radially outward from the cylindrical surface C4.
  • the top 20g contacts the inner wall V1.
  • the top portion 20g moves outward in the radial direction, it is elastically deformed, and the portion where the tip end portion of the second linear portion 20c closely adheres along the inner wall V1 increases.
  • each top 20g moves in the reduced diameter state of the elastic support 2 depends on the shape of each elastic member 20, the position of the elastic member fixing portion 34, and the outer diameter at the time of diameter reduction. In general, the closer the distance between the bent portions 20h, 20f and the elastic member fixing portion 34, the easier the top portions 20g move outward in the radial direction. Accordingly, if the outer diameter of the elastic support 2, the shape of each elastic member 20, and the position of the elastic member fixing portion 34 are appropriately set according to the inner diameter of the indwelling blood vessel, 20g can be in contact with the inner wall of the blood vessel or not.
  • each apex 20g can be brought into contact with or not in contact with the inner wall of the blood vessel by changing the angle ⁇ 2 of the bent portion 20k with respect to the plane S3.
  • the description will be made on the assumption that the top portion 20g is positioned radially inward from the cylindrical surface C3 in the reduced diameter state.
  • each pressing portion 35 moves in the radial direction until it is positioned on the cylindrical surface C3.
  • each pressing portion 35 is in contact with the inner wall V1 of the superior vena cava P3 and forms the inner wall V1 in the radial direction at a position of 120 ° in the circumferential direction. Press outward.
  • each circumferential line-shaped portion CL is located inside the cylindrical surface C3 where the elastic member fixing portion 34 is located, and is not in contact with the inner wall V1 of the superior vena cava P3.
  • the circumferential line portion CL is a closed loop shape having a constant line length by being fixed by the elastic member fixing portion 34, and is a ring-shaped spring member that can expand and contract in the radial direction. For this reason, as shown in FIGS. 14A and 14B, the elastic restoring force of each circumferential line-shaped portion CL due to the deformation is applied to the elastic member fixing portion 34 even when the top portions 20g are not in contact with the inner wall V1. For this reason, each circumferential line-shaped part CL urges the pressing part 35 radially outward. With such a configuration, each pressing portion 35 is elastically supported by each circumferential line portion CL on the distal end side of the elastic support 2.
  • each pressing portion 35 is elastically supported by the respective proximal end side linear portions 20b and 20d which are elastic members supported by the converging portion 27 on the proximal end side of the elastic support body 2.
  • the elastic support body 2 in a reduced diameter state presses the inner wall V ⁇ b> 1 equally in three directions by the respective pressing portions 35.
  • the press part 35 is gathered in three places of the circumferential direction.
  • the inner wall of the blood vessel can be pressed more firmly.
  • the stimulation electrodes 21 and 22 can be more reliably and stably pressed against the inner wall V1.
  • each pressing part 35 is equally pressed radially outward by the elastic restoring force of the circumferential line-shaped part CL, the indwelling position can be stabilized even with a small contact area.
  • the elastic support 2 of the present embodiment has an outer shape that conforms to a semi-spindle shape that swells toward the converging portion 27 as a whole, although the tip is reduced in diameter. For this reason, compared with the shape which contact
  • Each elastic member 20 forms a bowl-like structure fixed by the elastic member fixing portion 34.
  • the elastic support body 2 can urge the inner wall V1 more stably as compared with a case where, for example, arc-shaped elastic members are spaced apart in the circumferential direction.
  • the elastic support 2 may move in the axial direction of the blood vessel in the process of determining the indwelling position. For this reason, the elastic support 2 may be repeatedly housed in the guide sheath 7 and pushed out from the guide sheath 7.
  • the elastic support body 2 When the elastic support body 2 is accommodated in the guide sheath 7, the elastic support body 2 is drawn into the guide sheath 7 having a smaller diameter than the blood vessel from the expanded diameter state in the blood vessel. Thereby, in the elastic support body 2, each elastic member 20 is crushed in the radial direction toward the central axis O.
  • each proximal end side linear part 20b, 20d has a shape that narrows toward the proximal end side, when accommodated in the guide sheath 7, it is accommodated smoothly, and the partial load is small.
  • the elastic support body 2 has a larger diameter toward the tip, and each circumferential line-shaped portion CL resists deformation at the tip as a spring member.
  • a particularly large load is applied to the distal end side of each elastic member 20 of the elastic support body 2.
  • FIG. 16 is a schematic diagram for explaining the operation of the elastic member of the medical electrical stimulation electrode according to the embodiment of the present invention.
  • FIG. 17 is a schematic diagram for explaining the operation of the elastic member of the comparative example.
  • FIG. 18 is a schematic enlarged view showing a deformed state of the top of the elastic member of the medical electrical stimulation electrode according to the embodiment of the present invention and the top of the elastic member of the comparative example.
  • FIG. 16A schematically shows the shape of the elastic member 20 ⁇ / b> A in the natural state of the elastic support 2.
  • the elastic support 2 constitutes a closed loop, and the bending angle ⁇ 3 ′ of the bent portion 20kA is slightly smaller than each of the bendings ⁇ 3 in the natural state of the elastic member 20A.
  • the reason why the bending angle is ⁇ 3 ′ is that, in the assembled state of the elastic support 2, the elastic member 20A is fixed to the elastic members 20B and 20C and elastically deformed.
  • FIG. 16B when the elastic support 2 is accommodated in the guide sheath 7, the elastic support 2 is reduced in diameter.
  • the widest bent portions 20hA and 20fA in the elastic support 2 move toward the central axis O and come into contact with the inner wall of the guide sheath 7.
  • An external force acts on the second linear portion 20cA toward the central axis O at both ends connected to the bent portions 20hA and 20fA.
  • This external force acts as a bending moment on the center in the longitudinal direction of the second linear portion 20cA.
  • the bent portion 20kA the vicinity of the top portion 20gA is bent in advance. That is, a crease is attached in the vicinity of the top portion 20gA.
  • the bent portion 20kA is bent by the elastic member 20A, the bending angle is easily reduced.
  • the second linear portion 20cA is smoothly folded around the top portion 20gA.
  • the bending angle ⁇ 3 ′ of the bent portion 20kA gradually decreases to ⁇ 4 close to 0 °.
  • transformation at the time of diameter reduction of the elastic support body 2 was demonstrated in the example of the elastic member 20A, the deformation
  • the elastic support 2 when the diameter of the elastic support 2 is reduced, plastic deformation of the elastic support 2 is suppressed. Therefore, when the elastic support 2 is pushed out from the guide sheath 7 and expanded in diameter, as shown in FIG. 16C, the elastic support 2 returns to the natural state when no external force is applied. For example, the bending angle of the bent portion 20 kA returns from ⁇ 4 to ⁇ 3 ′. In this way, the elastic support 2 only repeats elastic deformation even if it is repeatedly housed in the guide sheath 7 and pushed out from the guide sheath 7, so that the pressing force that presses the inner wall of the blood vessel decreases. There is nothing to do. Since the medical electrical stimulation electrode 1 includes such an elastic support 2, the medical electrical stimulation electrode 1 can be stably placed in the blood vessel even if the folding is repeated.
  • the elastic support 2 will be further described in comparison with a comparative example.
  • the elastic support of the comparative example includes elastic members 50 shown in FIG. 17A in place of the elastic members 20A, 20B, and 20C.
  • the elastic member 50 includes a second linear portion 50c instead of the second linear portion 20cA of the elastic member 20A.
  • the second linear portion 50c is a linear portion made of an arc.
  • the second linear portion 50c is inclined by an angle ⁇ with respect to the plane S2 in the natural state, like the second linear portion 20cA excluding the bent portion 20kA. Both ends of the second linear portion 50c are connected to the bent portions 20hA and 20fA in the same manner as the second linear portion 20cA.
  • the diameter of the second linear portion 50c in the natural state of the elastic member 50 is larger than the outer diameter of the elastic support in the natural state.
  • the 2nd linear part 50c is provided with the top part 50g which is a part of circular arc in the position used as the front-end
  • FIG. 17A schematically shows one elastic member 50 in the natural state of the elastic support of the comparative example. Since the elastic member 50 is slightly elastically deformed in the natural state of the elastic support, the second linear portion 50c is slightly different from the natural arcuate shape of the elastic member 50. However, since the amount of deformation is small, the vicinity of the top portion 50g of the second linear portion 50c is substantially arc-shaped. As shown in FIG. 17B, when the elastic support body of the comparative example is accommodated in the guide sheath 7, the elastic member 50 also moves toward the central axis O and abuts against the inner wall of the guide sheath 7.
  • the same external force as the second linear portion 20cA acts on the second linear portion 50c. Since the second linear portion 50c is the same as the substantially arc-shaped beam, the external force acting on the second linear portion 50c deforms each position acting in the longitudinal direction of the second linear portion 50c substantially evenly. . For this reason, the 2nd linear part 50c resists the 2nd linear part 50c whole with respect to external force. That is, the curvature of the second linear portion 50c gradually increases, and the curved shape gradually changes.
  • the portion where the load increases is concentrated in the intermediate portion of the second linear portion 50c including the top portion 50g.
  • the inner diameter of the guide sheath 7 is much smaller than the outer diameter of the elastic support, the distal end of the second linear portion 50c must be bent below the inner diameter of the guide sheath 7.
  • the vicinity of the top portion 50g in the natural state is an arc having a small curvature, it is substantially the same as the bent portion opened at about 180 °.
  • the amount of deformation in the vicinity of the top 50g when the diameter is reduced is larger than that of the second linear portion 20cA that is deformed from the bending angle ⁇ 3 ′ smaller than 180 °.
  • a large stress is concentrated on the distal end portion of the second linear portion 50c as compared with the second linear portion 20cA, and plastic deformation occurs.
  • the second linear portion 20cA is formed with a bent portion 20kA, and the top portion 20gA is composed of a plastically processed corner 20 portion G.
  • the linear elastic body extending from the corner portion 20G is deformed as a beam having the corner portion 20G as a support end.
  • the bending angle changes greatly because the beam bends.
  • looking at the shape after deformation indicated by the two-dot chain line in FIG. 18A the outside of the corner portion 20G does not extend so much and the inside of the bending is not compressed so much. I understand that. Therefore, plastic deformation does not occur in the corner portion 20G, and the bending angle can return to the natural state.
  • the second linear portion 50c of the comparative example has an arc shape with a small curvature in the natural state indicated by the solid line. It can be seen that in order for the second linear portion 50c to be in a reduced diameter state indicated by a two-dot chain line, extremely large bending deformation needs to occur locally in the vicinity of the top portion 50g.
  • the second linear portion 50c is accommodated in the guide sheath 7 in a state of being bent at an angle ⁇ 5, for example, in the vicinity of the top portion 50g.
  • the angle ⁇ 5 is approximately the same as the bending angle ⁇ 4 when the elastic support 2 is accommodated. Since the top portion 50g is plastically deformed, as shown in FIG. 17C, even if the elastic member 50 is taken out from the guide sheath 7, an angle ⁇ 6 (however, ⁇ 6> ⁇ 5) is present in the vicinity of the top portion 50g. An open bend is formed. The vicinity of the top 50g does not return to the original arc.
  • the elastic support body of the comparative example when the housing in the guide sheath 7 and the extrusion from the guide sheath 7 are repeated, the outer diameter of the elastic support body 2 gradually decreases. Thereby, the pressing force to the blood vessel is reduced, and there is a possibility that it cannot be stably placed on the inner wall of the blood vessel.
  • FIG. 19 is a schematic diagram illustrating a configuration of a main part of an elastic member used for the medical electrical stimulation electrode according to the first modification of the embodiment of the present invention.
  • the medical electrostimulation electrode of this modification includes an elastic member 60 whose main part is shown in FIG. 19 in place of the elastic members 20A, 20B, and 20C in the medical electrostimulation electrode 1 of the above embodiment.
  • an elastic member 60 whose main part is shown in FIG. 19 in place of the elastic members 20A, 20B, and 20C in the medical electrostimulation electrode 1 of the above embodiment.
  • each elastic member 60 of the present modification includes a bent portion 60 k instead of the bent portion 20 k of the elastic member 20.
  • One of the elastic members 60 includes the stimulation electrodes 21, 22 and the like, similarly to the elastic member 20A.
  • the bending portion 60k is the same as the bending portion 20k except that a bending portion having a radius of curvature R (where R> 0) is formed in the bending when bending is performed.
  • the radius of curvature R in the bending of the bent portion 60k is not particularly limited as long as it is equal to or less than the bending radius R determined from the maximum arc that can be inserted into the guide sheath 7.
  • the maximum arc that can be inserted into the guide sheath 7 is an arc having a radius of curvature that is 1 ⁇ 2 of the inner diameter of the guide sheath 7.
  • the maximum value of the radius of curvature R in bending may be obtained by subtracting the thickness of the elastic member 60 from the radius of curvature of such an arc.
  • the radius of curvature R is preferably as small as possible.
  • the elastic member 60 of the present modification by setting the radius of curvature R in the bending of the bent portion 60k within an appropriate range, the elastic deformation of the elastic support of the present modification when the diameter is reduced can be prevented. Can be prevented. For this reason, according to the medical electrical stimulation electrode of this modification using the elastic member 60, even if folding is repeated, it can be stably placed in the blood vessel.
  • the bending portion of the apex portion 20g of the bent portion 60k of the elastic member 60 is a curved portion having a radius of curvature R. For this reason, when forming the bending part 60k, the bending process of the vicinity of the top part 20g becomes easy.
  • the linear elastic body used for the elastic member 60 it is possible to employ a material that is difficult to be plastically deformed.
  • FIG. 20 is a schematic plan view showing a configuration of an elastic member used for the medical electrical stimulation electrode of the second modified example of the embodiment of the present invention.
  • the medical electrostimulation electrode of this modification includes the elastic member 70 shown in FIG. 20 in place of the elastic members 20A, 20B, and 20C in the medical electrostimulation electrode 1 of the above embodiment.
  • the elastic member 70 shown in FIG. 20 in place of the elastic members 20A, 20B, and 20C in the medical electrostimulation electrode 1 of the above embodiment.
  • each elastic member 70 of the present modification includes a bent portion 70 k instead of the bent portion 20 k of the elastic member 20.
  • One of the elastic members 70 includes stimulation electrodes 21 and 22 and the like, similarly to the elastic member 20A.
  • the bent portion 70k is a bent portion that opens in a V shape from the top portion 20g toward the proximal end side of the elastic member 70.
  • the bent portion 70k constitutes a V-shaped first bent portion that is convex in a direction away from the connecting end portions 20a and 20e.
  • the bending angle ⁇ 7 of the bent portion 70k is smaller than the bent angle ⁇ 3 of the bent portion 20k of the above embodiment.
  • the shape of the 2nd linear part 20c except the bending part 70k is the same as that of the said embodiment.
  • the bent part 70k is formed with a bent part 70j at the connection part with the second linear part 20c.
  • the bent portion 20j in the above embodiment is formed by inclining the bent portion 20k by an angle ⁇ 2 with respect to the plane S3.
  • the bent part 20j is a linear part smoothly connected when viewed from the direction along the normal line of the plane S3 by rotating the bent part 20k so that the angle ⁇ 2 becomes 0 °.
  • the bent portion 70j is bent in a V shape when viewed from the direction along the normal line of the plane S3 by rotating the bent portion 70k so that the angle ⁇ 2 becomes 0 °. That is, the bending angle ⁇ 8 at the bending portion 70j is smaller than the bending angle at the bending portion 20j.
  • the bending portion 70j has an opening angle between the bent portion 70k and the second linear portion 20c as viewed from the direction along the normal line of the plane S3. It is smaller than the opening angle with the part 20c. Therefore, as shown in FIG. 20, the opening angle between the bent portion 70k and the second linear portion 20c viewed from the direction along the normal line of the plane S2 (the vertical direction in the drawing) is also the bent portion of the above embodiment. The opening angle between 20k and the second linear portion 20c is small.
  • the bending angle ⁇ 7 of the bent portion 70k is smaller than that in the above embodiment, when the diameter of the elastic support of this modification is reduced, the load on the top 20g is further reduced. For this reason, even if the diameter reduction and the diameter expansion are repeated, the plastic deformation in the top portion 20g is further less likely to occur. According to the medical electrical stimulation electrode of this modification using the elastic member 70, even if folding is repeated, it can be stably placed in the blood vessel.
  • the bent portion 70j is formed in the vicinity of the bent portion 70k of the elastic member 70.
  • the bent portion 70j is further bent than the bent portion 20j of the above-described embodiment when viewed from the direction along the normal line of the plane S2. For this reason, when the diameter of the elastic support of the present modification is reduced, the bending angle of the bent portion 70j is expanded, so that the deformation stress at the time of diameter reduction is dispersed. Also in this respect, since the load on the top portion 20g is relieved, plastic deformation in the top portion 20g is further difficult to occur.
  • FIG. 21 is a schematic plan view showing a configuration of an elastic member used for the medical electrical stimulation electrode of the third modified example of the embodiment of the present invention.
  • FIG. 22 is a schematic front view showing a configuration of an elastic member used for the medical electrical stimulation electrode of the third modified example of the embodiment of the present invention.
  • the medical electrostimulation electrode of this modification includes the elastic member 80 shown in FIG. 21 instead of the elastic members 20A, 20B, and 20C in the medical electrostimulation electrode 1 of the above embodiment.
  • the elastic member 80 shown in FIG. 21 instead of the elastic members 20A, 20B, and 20C in the medical electrostimulation electrode 1 of the above embodiment.
  • each elastic member 80 of the present modification includes bent portions 80k and 80n instead of the bent portion 20k of the elastic member 20.
  • One of the elastic members 80 includes stimulation electrodes 21, 22 and the like, like the elastic member 20A.
  • the bent portion 80k is a bent portion that opens in a V shape from the top portion 20g toward the proximal end side of the elastic member 80.
  • the bent portion 80k constitutes a V-shaped first bent portion that is convex in a direction away from the connecting end portions 20a and 20e.
  • the bent portion 80n is a V-shaped bent portion in which a linear elastic body extending from the bent portion 80k is bent at the bent portion 80m.
  • the bent portion 80n is connected to the second linear portion 20c at the bent portion 80p.
  • the bent portions 80n are respectively formed on the sides of the bent portion 80k.
  • Each of the bent portions 80n constitutes a V-shaped second bent portion that is convex in a direction approaching the connecting end portions 20a and 20e.
  • the bending angles of the bent portions 80k and 80n are not particularly limited. Further, the bending angles of the bent portions 80k and 80n may be the same or different from each other. Each bending angle can be made smaller than the bending angle ⁇ 3 of the above embodiment. As shown in FIG. 22A, the bent portions 80k and 80n are inclined by an angle ⁇ 2 with respect to the plane S3, as in the above embodiment. That is, the bent portions 80k and 80n are located on the same plane.
  • the elastic support in the medical electrical stimulation electrode according to this modification includes an elastic member 80 having bent portions 80k and 80n. For this reason, when the diameter of the elastic support is reduced, both of the bent portions 80k and 80n are elastically deformed so that the bending angle is reduced. For this reason, when the load similar to the said embodiment acts at the time of diameter reduction, a load is disperse
  • the bent portion 80n is disposed closer to the proximal end side of the elastic member 20 than the bent portion 80k. For this reason, it is possible to provide a plurality of bent portions having a shallow bending angle without increasing the axial length of the elastic support. As a result, it is possible to reduce the size of the elastic support for the medical electrical stimulation electrode.
  • This modification is an example in which the bent part 80n does not have to have the top part (bent part 80m) on the plane S1 which is the symmetry plane of the elastic member.
  • FIG. 23 is a schematic front view showing a configuration of an elastic member used for the medical electrical stimulation electrode of the fourth modified example of the embodiment of the present invention.
  • the medical electrostimulation electrode of this modification includes an elastic member 81 shown in FIGS. 21 and 22 instead of the elastic members 20A, 20B, and 20C in the medical electrostimulation electrode 1 of the above embodiment.
  • an elastic member 81 shown in FIGS. 21 and 22 instead of the elastic members 20A, 20B, and 20C in the medical electrostimulation electrode 1 of the above embodiment.
  • each elastic member 81 of the present modification includes bent portions 80k and 80n in the same manner as in the third modified example, instead of the bent portion 20k of the elastic member 20.
  • One of the elastic members 80 includes stimulation electrodes 21, 22 and the like, like the elastic member 20A.
  • the bent portion 80n is located on the plane S3. Therefore, a bent portion 80j is formed between the top portion 20g and the bent portion 80m.
  • This modification is the same as the third modification except that the bent portions 80k and 80n are not located on the same plane. For this reason, according to the medical electrical stimulation electrode of this modification using the elastic member 81, even if folding is repeated, it can be stably placed in the blood vessel.
  • FIG. 24 is a schematic plan view showing a configuration of an elastic member used for the medical electrical stimulation electrode of the fifth modified example of the embodiment of the present invention.
  • FIG. 25 is a schematic front view showing a configuration of an elastic member used for the medical electrical stimulation electrode of the fifth modified example of the embodiment of the present invention.
  • the medical electrostimulation electrode of this modification includes the elastic member 90 shown in FIG. 24 instead of the elastic members 20A, 20B, and 20C in the medical electrostimulation electrode 1 of the above embodiment.
  • the elastic member 90 shown in FIG. 24 instead of the elastic members 20A, 20B, and 20C in the medical electrostimulation electrode 1 of the above embodiment.
  • each elastic member 90 of this modification includes a bent portion 90k instead of the bent portion 20k of the elastic member 20.
  • One of the elastic members 90 includes stimulation electrodes 21 and 22 and the like, like the elastic member 20A.
  • the bent portion 90k is formed in a V shape having a top portion 90g on the base end side.
  • the top 90g is located on the plane S1.
  • the end of the bent portion 90k opposite to the top 90g is connected to the second linear portion 20c via the bent portion 90m.
  • the bending angle at the top 90g of the bent portion 90k is ⁇ 9.
  • the bending angle ⁇ 9 can be the same angle as ⁇ 3 in the above embodiment.
  • Within the bend of the bent portion 90k there may be a curvature with a radius of curvature of 5 mm or less formed for processing convenience.
  • the bent portion 90k is inclined by an angle ⁇ 2 with respect to the plane S3, like the bent portion 20k of the above embodiment.
  • the bent portion 90k constitutes a V-shaped second bent portion that is convex in a direction approaching the connecting end portions 20aA and 20eA.
  • This modification is an example in which the second linear portion 20c has only the second bent portion.
  • the elastic support in the medical electrical stimulation electrode according to this modification includes an elastic member 90 having a bent portion 90k.
  • the bent portion 90k differs from the bent portion 20k of the above-described embodiment mainly in the convex direction. For this reason, the load at the time of diameter reduction is disperse
  • the example in which the stimulation electrode unit is arranged in the superior vena cava to stimulate the vagus nerve is described as an example.
  • the stimulation electrode unit may stimulate nerves other than the vagus nerve.
  • the stimulation electrode unit can be disposed in an appropriate blood vessel that can transmit the stimulation to the nerve that performs the stimulation.
  • the elastic support has a shape that is three-fold rotationally symmetric about the central axis.
  • the elastic support can also have a rotationally symmetric shape of three or more times.
  • strict rotational symmetry is not required as long as the elastic support can apply a substantially equal pressing force to the inner wall of the blood vessel when the diameter of the elastic support is reduced.
  • a substantially rotationally symmetric shape in which the shape of each elastic member is not symmetrical due to variations due to manufacturing errors or distortion due to assembly errors is also possible.
  • the overall shape is close to rotational symmetry, a substantially rotationally symmetric shape having a shape portion that does not have rotational symmetry in part is also possible.
  • the formation position of the pressing part is formed at a position that divides the circumferential direction into three equal parts, but the shape of the pressing part is different, or the pressing part is slightly different from the position that divides the circumferential direction into three equal parts Etc. are acceptable.
  • the base end side linear portions 20b and 20d of the adjacent elastic members are described as an example in which the elastic member fixing portions 64 are fixed to each other.
  • the elastic member fixing portion 64 may be deleted, and the proximal side linear portions 20b and 20d may be separated from each other in the circumferential direction.
  • the wires 23X and 23Y are coated with the outer coating 26 .
  • a linear body in which a metal wire is coated with a resin can be employed. Since the resin coating in this case is further covered with the outer coating 26, it does not come into direct contact with the living body, and therefore an appropriate resin material can be employed.
  • the bending rigidity of the wire 23X which is the core material in the first elastic member
  • the bending rigidity of the wire 23Y which is the core material in the second elastic member.
  • the bending rigidity of each of the elastic members 20A, 20B, and 20C can be easily made equal.
  • the cross-sectional shape of the wire 23Y is changed so that the cross-sectional secondary moment related to bending is larger than that of the wire 23X.
  • the bending rigidity of the elastic members 20A, 20B, and 20C can be made substantially the same. Furthermore, it is also possible to make each bending rigidity of elastic member 20A, 20B, 20C correspond.
  • the method of changing the cross-sectional shapes of the wires 23X and 23Y may be changed to be similar to each other or may be changed by using different shapes. In the case of a non-similar shape, for example, the long side and the short side may be arbitrarily changed in a rectangular cross section. Furthermore, when making it a non-similar shape, you may change the kind of cross-sectional shape.
  • the method of changing the bending rigidity of the wires 23X and 23Y is not limited to changing the second moment of section.
  • the bending rigidity of each other may be changed by manufacturing the wires 23X and 23Y using materials having different longitudinal elastic modulus.
  • the elastic members 20A, 20B, and 20C have the same bending rigidity, the elastic restoring force when the elastic support 2 is reduced by a certain amount will be described as an example. did.
  • the elastic restoring force when the diameter of the elastic support 2 is reduced by a certain amount may be made uneven in the circumferential direction.
  • the bending rigidity of the elastic members 20A, 20B, and 20C may be two types. Further, all of the bending rigidity of the elastic members 20A, 20B, and 20C may be different.
  • the elastic restoring force when the cross-sectional shape of the blood vessel is deviated from a perfect circle, if the elastic restoring force is equalized when the diameter is reduced to match the perfect circular cross-section, an uneven pressing force acts on the inner wall of the blood vessel. .
  • the position of the elastic support 2 may become unstable when the patient moves.
  • the elastic restoring force when the diameter is reduced in accordance with the circular cross-section in advance is appropriately non-uniform, when the elastic support 2 is deformed to match the cross-sectional shape of the blood vessel, It is possible to equalize the pressing force acting on the inner wall in the circumferential direction. In this case, even when the cross-sectional shape of the blood vessel is deviated from a perfect circle, the position of the elastic support 2 can be stabilized.
  • the entire second linear portion 20c can be configured only by a bent portion formed in a V shape having a top at the tip.
  • the top of the bent portion is formed of a bent portion.
  • the inner diameter of the guide sheath 7 is used. Compared to the above, a curved portion having a smaller radius of curvature can be formed in the bend.

Landscapes

  • Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Electrotherapy Devices (AREA)

Abstract

L'invention concerne une électrode d'électrostimulation médicale comprenant : un support élastique constitué d'une pluralité d'éléments élastiques formés en repliant des corps élastiques linéaires en boucles fermées, chaque élément élastique étant doté d'une extrémité de raccordement sur laquelle les deux extrémités du corps élastique linéaire respectives sont raccordées ; une paire de premières parties linéaires qui comprennent des parties du corps élastique linéaire s'étendant depuis l'extrémité de raccordement et s'éloignant l'une de l'autre, et une seconde partie linéaire qui comprend deux extrémités qui sont raccordées aux extrémités distales de la paire de premières parties linéaires dans le sen d'extension, et qui présentent au moins une partie de pliage entre les deux extrémités ; une partie d'électrode de stimulation disposée sur au moins l'un des éléments élastiques de la pluralité d'éléments élastiques afin de fournir un stimulus électrique par l'intermédiaire de la paroi intérieure d'un vaisseau sanguin ; un câblage connecté électriquement à la partie d'électrode de stimulation ; et une partie de fil qui s'étend de manière linéaire et présente un élément d'extrémité distale auquel l'extrémité de raccordement de chacun des éléments élastiques de la pluralité d'éléments élastiques est raccordé, le câblage étant introduit à travers la partie de fil.
PCT/JP2015/052955 2015-02-03 2015-02-03 Électrode d'électrostimulation médicale Ceased WO2016125250A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2015/052955 WO2016125250A1 (fr) 2015-02-03 2015-02-03 Électrode d'électrostimulation médicale
JP2016572976A JP6438497B2 (ja) 2015-02-03 2015-02-03 医療用電気刺激電極

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2015/052955 WO2016125250A1 (fr) 2015-02-03 2015-02-03 Électrode d'électrostimulation médicale

Publications (1)

Publication Number Publication Date
WO2016125250A1 true WO2016125250A1 (fr) 2016-08-11

Family

ID=56563615

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/052955 Ceased WO2016125250A1 (fr) 2015-02-03 2015-02-03 Électrode d'électrostimulation médicale

Country Status (2)

Country Link
JP (1) JP6438497B2 (fr)
WO (1) WO2016125250A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021067498A1 (fr) * 2019-10-01 2021-04-08 Epineuron Technologies Inc. Systèmes et procédés pour administrer une thérapie neurorégénérative et réduire la douleur postopératoire et chronique
US11247045B2 (en) 2017-10-25 2022-02-15 Epineuron Technologies Inc. Systems and methods for delivering neuroregenerative therapy
US11247043B2 (en) 2019-10-01 2022-02-15 Epineuron Technologies Inc. Electrode interface devices for delivery of neuroregenerative therapy
US11247044B2 (en) 2017-10-25 2022-02-15 Epineuron Technologies Inc. Devices for delivering neuroregenerative therapy

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993004734A1 (fr) * 1990-03-06 1993-03-18 Daniel Galley Systeme d'electrode epidurale appelee a etre introduite dans l'espace epidural
JP2010516405A (ja) * 2007-01-30 2010-05-20 カーディアック ペースメイカーズ， インコーポレイテッド ステント様アンカーを有する神経細胞刺激用リード
JP2010516384A (ja) * 2007-01-30 2010-05-20 カーディアック ペースメイカーズ， インコーポレイテッド 二重らせんリード構成
JP2013236662A (ja) * 2012-05-11 2013-11-28 Olympus Corp 神経刺激電極および神経刺激システム

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008070189A2 (fr) * 2006-12-06 2008-06-12 The Cleveland Clinic Foundation Procédé et système pour traiter une insuffisance cardiaque aiguë par neuromodulation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993004734A1 (fr) * 1990-03-06 1993-03-18 Daniel Galley Systeme d'electrode epidurale appelee a etre introduite dans l'espace epidural
JP2010516405A (ja) * 2007-01-30 2010-05-20 カーディアック ペースメイカーズ， インコーポレイテッド ステント様アンカーを有する神経細胞刺激用リード
JP2010516384A (ja) * 2007-01-30 2010-05-20 カーディアック ペースメイカーズ， インコーポレイテッド 二重らせんリード構成
JP2013236662A (ja) * 2012-05-11 2013-11-28 Olympus Corp 神経刺激電極および神経刺激システム

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11247045B2 (en) 2017-10-25 2022-02-15 Epineuron Technologies Inc. Systems and methods for delivering neuroregenerative therapy
US11247044B2 (en) 2017-10-25 2022-02-15 Epineuron Technologies Inc. Devices for delivering neuroregenerative therapy
US12318608B2 (en) 2017-10-25 2025-06-03 Epineuron Technologies Inc. Devices and methods for delivering neuroregenerative therapy
WO2021067498A1 (fr) * 2019-10-01 2021-04-08 Epineuron Technologies Inc. Systèmes et procédés pour administrer une thérapie neurorégénérative et réduire la douleur postopératoire et chronique
US11247043B2 (en) 2019-10-01 2022-02-15 Epineuron Technologies Inc. Electrode interface devices for delivery of neuroregenerative therapy
US11364381B2 (en) 2019-10-01 2022-06-21 Epineuron Technologies Inc. Methods for delivering neuroregenerative therapy and reducing post-operative and chronic pain

Also Published As

Publication number Publication date
JPWO2016125250A1 (ja) 2017-11-16
JP6438497B2 (ja) 2018-12-12

Similar Documents

Publication Publication Date Title
US20230023767A1 (en) Tube-cut helical fixation anchor for electrotherapy device
AU2008210862B2 (en) Neurostimulating lead having a stent-like anchor
US7856707B2 (en) Method for performing a coplanar connection between a conductor and a contact on an implantable lead
US7953496B2 (en) Implantable lead with isolated contact coupling
JP2838500B2 (ja) 人体植え込み型の医療用電気リード
EP2125106B1 (fr) Configurations en spirale pour la stabilisation d'une dérivation intravasculaire
JP5525624B2 (ja) ２以上の区域を有するコイル導体を備えた医療用リード線および該コイル導体の構築方法
JP4500314B2 (ja) 医療リードの固定法
US20070038278A1 (en) Tubular lead electrodes and methods
CA2298667A1 (fr) Conducteur endocardiaque a petit cable et a tube guide expose
JP6438497B2 (ja) 医療用電気刺激電極
US11395921B2 (en) Intravascular electrode arrays for neuromodulation
JP6557507B2 (ja) 医療用電気刺激電極
US20030199949A1 (en) Stylet for an implantable lead
JP6335025B2 (ja) 医療用電気刺激電極
JP6400676B2 (ja) 医療用電気刺激電極及び医療用電気刺激装置
JP6654915B2 (ja) 医療用電気刺激電極および医療用電気刺激装置
JP6626381B2 (ja) 神経刺激電極および電極カテーテルシステム
JP6454113B2 (ja) 医療用電気刺激電極
JP6608677B2 (ja) 神経刺激電極
JP2016007437A (ja) 医療用電気刺激電極
JP2017164045A (ja) 神経刺激電極
JP2016077801A (ja) 電極ユニットおよび神経刺激システム
JP2016007263A (ja) 医療用リード

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15881067

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2016572976

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15881067

Country of ref document: EP

Kind code of ref document: A1