WO2010061675A1 - Catheter, method of inserting catheter into body, and method of extracting catheter - Google Patents

Abstract

A catheter for leading a medication into the body of a mammal including a human being.  The catheter is provided with an anchor section (10) provided to a side surface of the catheter and configured so that the shape of the anchor section is changed by operation from the outside of the body and that the catheter is anchored in the body, a wire member (12) mounted to an anchor (13) which is located at the front end of the catheter, having a base end located outside the body, and provided along an inner path (14) of the catheter.  The catheter is anchored in the body or released from the body by changing the shape of the anchor section (10) by advancing or retracting the wire member (12) relative to the base end side from the position of the anchor (13).

Description

Catheter, method for inserting catheter into body and method for extracting catheter from body

The present invention relates to a catheter which can be anchored in the body of a mammal including human and which guides a drug into the body, a method of inserting the catheter into the body, and a method of extracting the catheter from the body.

Conventionally, a catheter is used to introduce a drug into the body of a mammal including human. In this conventional catheter, a puncture needle having an internal passage is attached to the tip of a flexible tube (see Patent Document 1). In order to fix such a catheter in place, it is common practice to bandage the catheter on the body surface.

Japanese Patent Application Laid-Open No. 3-57457

By the way, although it is preferable that a catheter in the body is similarly anchored to an organ in the body, if a member for anchoring is provided, the presence of the member for anchoring anchors the process of insertion and withdrawal of the catheter. And it takes time and effort.

The present invention has been made in view of the above, and it is a catheter that can be reliably anchored in the body without affecting the process of insertion and removal of the catheter, a method of inserting the catheter into the body, and a catheter The purpose is to provide a method for the removal of

In order to solve the problems described above and achieve the purpose, a catheter according to the present invention is a catheter for guiding a drug into the body of a mammal including human, which is provided on the side of the catheter and shaped by external operation. Are provided with anchoring portions for anchoring the catheter in the body.

In the catheter according to the present invention, in the above-described invention, a tube for guiding the drug into the body, and at least one drug discharge hole provided at the tip of the tube and discharging the drug led to the tube into the body A drug administration unit, and the anchor unit is provided in the drug administration unit.

In the catheter according to the present invention, in the above-described invention, the catheter according to the present invention comprises a wire having a tip attached to a predetermined portion of the catheter, a proximal end located outside the body, and disposed along the catheter; It is characterized in that the wire is advanced or retracted with respect to the catheter on the proximal side from the position to change the shape of the anchoring portion.

Further, in the above-mentioned invention, the catheter according to the present invention is characterized in that the wire is a metal wire.

In the catheter according to the present invention, in the above-described invention, the anchoring portion is provided on the catheter proximal to the attachment position of the wire and is a more flexible portion than the other portions of the catheter, By pulling the wire toward the proximal side with respect to the catheter on the proximal side from the attachment position of the wire to the catheter, the anchoring portion which is the flexible portion is compressed, and the anchoring portion is radially outward It is characterized by being raised.

In the catheter according to the present invention, in the above-described invention, the anchoring portion may be a protrusion projecting outward from the catheter, a core member provided inside the protrusion, and the wire relative to the wire. And a joint for pivotally attaching the core member, and pulling the wire rod toward the proximal end side with respect to the catheter on the proximal end side from the attachment position of the wire rod to the catheter relative to the wire rod The core material is pivoted, and an angle formed by the projecting direction of the projection with respect to the axial direction of the catheter is changed.

In the catheter according to the present invention, in the above-described invention, the catheter further includes a tip that can be separated at the tip, and a protrusion that is provided in the internal passage, and the wire is attached at the tip to the tip. The proximal end is located outside the body through the internal passage of the catheter, and the anchor portion is provided on the catheter proximal to the protrusion and is a more flexible site than other parts of the catheter, By pulling the wire toward the proximal end with respect to the catheter, the distal end is locked at the projection when the distal end moves proximally through the internal passage in the catheter. A compressive pressure is applied to the anchoring portion which is the flexible portion, and the anchoring portion bulges in a radially outward direction.

In the catheter according to the present invention, in the above-described invention, the distal end portion is a punctured portion having a sharpened distal end, and the punctured portion at the distal end portion in a state where the distal end portion is locked by the projection. Are all configured to be housed within the internal passageway of the catheter.

Further, in the above-described invention, the catheter according to the present invention is provided with a coupled portion which is attached to a predetermined portion of the catheter and which can be coupled or engaged with the wire in the inner passage of the catheter. By pushing or pulling the coupled or engaged wire proximally, the coupled or engaged position is advanced or retracted relative to the proximal catheter to change the shape of the anchoring portion. It is characterized by

Further, in the above-described invention, the catheter according to the present invention is a delivery unit which is located on the proximal end side of the catheter from the anchoring portion and which delivers a drug toward the distal direction of the catheter; A distal end portion located on the distal end side is further included, and the shape of the anchoring portion is configured to be changed by relatively moving the delivery portion and the distal end portion.

Further, according to the method of inserting a catheter according to the present invention into the body, the catheter is inserted into the body of a living tissue by inserting a catheter having a wire and an anchor portion projecting to the outer surface by pulling the wire. A method of puncturing the catheter with the tissue so that the anchor portion is positioned in the body tissue, with the anchor portion not protruding, pulling the wire to project the anchor portion; And fixing the position of the catheter and the living tissue by the anchoring portion.

Further, a method of extracting the catheter according to the present invention from the body is a catheter having a wire and an anchoring portion whose protrusion is reduced from the outer surface by pushing or pulling the wire, which is anchored to a living tissue. A method for withdrawing the catheter from the body tissue, wherein the proximal end of the catheter is held and the wire is pushed or pulled to reduce the protrusion from the outer surface of the anchoring portion, and And withdrawing the catheter from the living tissue.

According to the present invention, the anchoring portion provided on the side of the catheter for guiding the drug into the mammalian body, including human beings, anchors the catheter in the body by changing its shape by operation from outside the body. The catheter can be anchored in the body reliably without affecting the process of insertion and removal of the catheter.

FIG. 1 is a schematic view showing a state in which the catheter according to Embodiment 1 of the present invention is applied to a human body. FIG. 2 is a perspective view showing a detailed configuration of a drug administration unit of the catheter shown in FIG. FIG. 3 is a cross-sectional view showing the detailed configuration of the drug administration unit of the catheter shown in FIG. FIG. 4 is a flowchart showing the procedure for inserting the catheter into the body. FIG. 5 is a flow chart showing the procedure for extracting the catheter from the body. FIG. 6 is a perspective view showing a detailed configuration of a drug administration unit of a catheter according to a second embodiment of the present invention. FIG. 7 is a cross-sectional view showing the detailed configuration of the drug administration unit of the catheter shown in FIG. FIG. 8 is a perspective view showing a detailed configuration of a drug administration unit of a catheter according to a third embodiment of the present invention. FIG. 9 is a cross-sectional view showing the detailed configuration of the drug administration unit of the catheter shown in FIG. FIG. 10 is a cross-sectional view showing the configuration of a modification of the catheter shown in FIG. FIG. 11 is a cross-sectional view showing the detailed configuration of the medicine administration section of the catheter according to the fourth embodiment of the present invention. FIG. 12 is a cross-sectional view showing the configuration of Modification 1 in which the position of the medicine discharge hole of the catheter shown in FIG. 3 is changed. FIG. 13 is a cross-sectional view showing the configuration of Modification 2 in which the position of the medicine discharge hole of the catheter shown in FIG. 3 is changed. FIG. 14 is a cross-sectional view showing the configuration of Modification 3 in which the configuration of the wire is removed from the catheter shown in FIG.

Hereinafter, embodiments of a catheter according to the present invention will be described in detail with reference to the drawings. The present invention is not limited by the embodiment.

Embodiment 1
FIG. 1 is a schematic view showing a state in which a drug administration device having a catheter according to Embodiment 1 of the present invention is applied to a human body. FIG. 2 is a perspective view showing a state in which the drug administration unit of the catheter shown in FIG. 1 is anchored to an internal organ. Furthermore, FIG. 3 is a cross-sectional view showing the configuration of the drug administration unit including a change in the state of the anchoring unit. In FIG. 1, several tens of ml of a drug such as an anticancer drug is continuously and intensively discharged over a long period of about one week to an administration target which is a mammal including human, for example, an internal organ 4 such as the liver. It shows the case of planned administration. The term "drug" as used herein includes liquid and gel drugs.

In FIGS. 1 to 3, the drug administration device 100 has a catheter 1 and a drug administration device main body 3 for supplying a drug to the catheter 1. The catheter 1 is provided with a tube 2 made of a biocompatible soft polyethylene and the like, and a distal end of the tube 2, and a drug administration made of hard titanium or molded polyethylene terephthalate (PET) resin, etc. And 8. The drug administration unit 8 punctures the internal organ 4. A stopper 7 is provided between the tube 2 and the drug administration unit 8, and the stopper 7 rests on the surface of the internal organ 4 to define the relative position between the internal organ 4 and the drug administration unit 8. The stopper 7 can be moved and adjusted along the axial direction of the catheter 1.

The drug administration device main body 3 is fixed to the body surface 6 and supplies the drug to the catheter 1 side as described above. The drug administration device main body 3 variably controls the pushing pressure of the drug. The drug administration device main body 3 does not have to be attached to the body surface 6. For example, the drug administration device main body 3 may be implanted in the body or may be spaced apart from the body.

As shown in FIG. 2, in the drug administration unit 8, the drug discharge hole 9 is provided on the side surface, and the anchor portion 10 protruding in the radially outward direction is provided between the pointed tip 11 and the drug discharge hole 9. . The anchoring portion 10 is raised from the surface of the catheter 1 at least while the catheter 1 is indwelled in the body, and anchors the catheter 1 in the internal organ 4. In addition, the shape of this mooring part 10 is deformable by operation from the outside of the body, as will be described later.

It is preferable that the position of the anchoring portion 10 be in the vicinity of the medicine discharge hole 9 because the medicine discharge position is stabilized. However, the position of the anchoring portion 10 is not limited to the vicinity of the drug discharge hole 9, and can be provided at an appropriate position in view of the arrangement of the target organ and surrounding tissue from among the sites where the catheter 1 is introduced into the body. . Moreover, you may provide the mooring part 10 not only in one place but in multiple places.

FIG. 3 is a cross-sectional view for explaining the shape change of the mooring portion 10. FIG. 3A shows the state of the catheter 1 before or during insertion into the body. A wire 12 such as a metal wire passes through the inner passage 14 of the catheter 1, and the tip of the wire 12 is attached to the catheter 1 by an anchor 13. The proximal end of the catheter 1 protrudes from the opening on the proximal end side of the inner passage 14 of the catheter 1 outside the body. The anchoring portion 10 has a thin film portion 15 whose thickness is thinner than that of the other conduit portion of the catheter 1, and the thin film portion 15 is more flexible than the other conduit portion of the catheter 1.

In the state of FIG. 3A, the catheter 1 is inserted to a desired position of the affected area 5. That is, the operator pulls the distal end portion to bring the anchor portion 10 into the extended state shown in FIG. 3A, holds the affected area, and punctures the catheter (FIG. 4: step S101). After the insertion, as shown by the arrow in FIG. 3 (a), when the operator pulls the wire 12 toward the proximal end side, as shown in FIG. 3 (b), the distal end portion of the catheter 1 together with the anchor 13 Move to the proximal side of the catheter 1. By this movement, a compressive pressure is applied to the thin film portion 15, and the thin film portion 15 bulges radially outward. The catheter 1 is anchored to the affected area 5 by the thin film portion 15 of the anchor portion 10 being raised. And an operator fixes so that the proximal end of the wire 12 may not move with respect to the proximal end of the catheter 1 (FIG. 4: step S102).

Thereafter, when the administration of the drug by the catheter 1 is completed, as shown in FIG. 3C, when the operator further pulls the wire 12 to the proximal end side of the catheter 1, the projection by the thin film portion 15 of the anchoring portion 10 is a catheter It will be in the state inclined to the front end side of 1 (FIG. 5: step S201). In this case, the anchoring portion 10 is less resistant to the direction of withdrawal of the catheter 1 from the body, and is easier to pull out. That is, the catheter 1 can be easily removed from the body by pulling out the entire catheter 1 (FIG. 5: step S202) while maintaining the state of FIG. 3 (c).

In step S201, the wire 12 is pulled to the base end side, but the protrusion of the anchoring portion 10 may be reduced by pushing the wire 12 from the base end side. That is, when the wire 12 has a certain degree of rigidity, by pushing the wire 12 from the base end side from the anchored state shown in FIG. It moves and as shown to Fig.3 (a), the thin film part 15 of the anchoring part 10 becomes flat. In other words, pushing the wire 12 from the proximal end restores the anchored state of FIG. 3 (b) to the punctured state of FIG. 3 (a). In this restored state, the catheter 1 can be easily removed from the body by pulling out the entire catheter 1.

In the first embodiment, the anchoring portion 10 does not get in the way when inserting or removing the catheter 1, and the catheter 1 can be smoothly inserted / removed while the catheter 1 is reliably anchored in the body by the anchoring portion 10 during drug administration. Therefore, stable drug administration can be performed.

If the elasticity of the thin film portion 15 is sufficiently large, the state of FIG. 3B is restored to the state of FIG. 3A by releasing the fixation of the wire 12. The fixation may be released.

Moreover, although the metal wire, thread | yarn, a string, etc. can be used for the wire 12, it is not limited to this. The use of a metal wire as the wire 12 can prevent the pressure in the insertion direction from causing a phenomenon in which the catheter 1, particularly the thin film portion 15 is folded like an accordion, when inserted into the internal passage 14 of the catheter 1 So preferred.

Second Embodiment
Next, a second embodiment of the present invention will be described. In the second embodiment, as shown in FIG. 6, a spike-like protruding portion 16 is provided as a mooring portion. FIG. 7 is a cross-sectional view showing the configuration of a drug administration portion of a catheter according to a second embodiment of the present invention. As shown in FIG. 7A, the wire 17 is inserted into the internal passage 14 of the catheter 1, and the wire 17 is inserted into the inside of the projecting portion 16 by the pivot joint 19 provided at the position corresponding to the projecting portion 16. It is pivotally connected to the proximal end of the embedded rod-shaped core 18. The distal end stopper 21 is provided at the distal end of the wire rod 17, and the distal end stopper 21 abuts on the distal end surface of the internal passage 14 of the catheter 1 to inhibit the further advancement of the wire rod 17 in the distal direction. Further, the intermediate stopper 20 is provided in the vicinity of the proximal end side of the protruding portion 16 in the wire rod 17, and the intermediate stopper 20 is closer to the proximal end than the intermediate stopper 20 in the internal passage 14 near the proximal end side of the projecting portion 16. Abutment of the abutment projection 22 provided on the rear side prevents the wire rod 17 from retreating further.

In the state of FIG. 7A, the distal end stopper 21 is in contact with the distal end surface, and in this case, the core 18 is inclined toward the proximal end side of the catheter 1 with respect to the axis of the wire 17 Similarly, the protrusion direction of the protrusion 16 is inclined to the proximal end side of the catheter 1 to facilitate insertion of the catheter 1 into the body.

Here, as shown in FIG. 7 (a), when the wire 17 is pulled to the proximal end side of the catheter 1, as shown in FIG. 7 (b), the core 18 is orthogonal to the axis of the wire 17. Thus, the protrusion 16 protrudes radially outward with respect to the axis of the catheter 1. As a result, the catheter 1 is anchored in the body.

Thereafter, when the administration of the drug is completed, as shown in FIG. 7 (b), the wire 17 is further pulled toward the proximal end side of the catheter 1 until the intermediate stopper 20 abuts on the contact projection 22. As shown in c), since the core material 18 is inclined to the distal end side with respect to the axis of the wire rod 17, the projection direction of the projection 16 is also inclined to the distal end side of the catheter 1 and It becomes easy to pull out.

The shape of the projecting portion 16 is not limited to the spike shape, and may be, for example, a disk shape or a donut shape having an opening at the central portion similar to the shape of the anchoring portion 10 shown in FIG.

Third Embodiment
Next, a third embodiment of the present invention will be described. In this third embodiment, as shown in FIG. 8, a plug 23 which is a separable tip is provided at the tip of the catheter 1, and the anchor 23 is formed on the tip side of the catheter 1 by using this plug 23. It is a thing.

FIG. 9 is a cross-sectional view showing a configuration of a drug administration unit of a catheter according to a third embodiment of the present invention. As shown in FIG. 9A, the plug 23 is partially accommodated in the inner passage of the catheter 1 at the tip of the drug administration unit 8 of the catheter 1. The wire 24 is attached to the plug 23 through the internal passage of the catheter 1. The anchoring portion 25 is formed with a thin film portion 27 thinner than the other conduit portion 26 of the catheter 1 as in the first embodiment. Further, the abutment step 28 is provided at the tip of the internal passage of the catheter 1, and the proximal end of the plug 23 abuts on the abutment step 28, thereby restricting the movement of the catheter 1 to the proximal side. There is.

When the wire 24 is pulled to the proximal end side of the catheter 1 in the state of FIG. 9A, as shown in FIG. 9B, the thin film portion 27 of the anchoring portion 25 bulges radially outward, The catheter 1 is anchored in the body by the anchor portion 25.

Thereafter, when the administration of the drug by the catheter 1 is completed, the wire 24 is further pulled to the proximal end side of the catheter 1 to cause a deformation in which the protuberances of the anchoring portion 25 incline to the distal end side. The restriction on the movement of the plug 23 to the proximal side is released. As a result, the plug 23 passes through the inner passage together with the wire 24 and is taken out from the proximal end opening of the catheter 1.

When the plug 23 and the wire 24 are removed from the catheter 1, as shown in FIG. 9 (c), the anchoring portion 25 of the catheter 1 in the body elastically recovers, and the protrusion in the radial direction disappears. Mooring is released. As a result, the catheter 1 can be easily withdrawn from the body outside.

As shown in FIG. 10, a cover 11c may be provided to cover the tip 11 of the plug 23. By providing the cover portion 11c, the distal end portion 11 is accommodated in the internal passage 14 even when the catheter is in the indwelling state.

Embodiment 4
Next, the fourth embodiment of the present invention will be described. In the first to third embodiments described above, the wires 12 and 24 are integrally coupled to the anchor 13 and the plug 23, and the wire 17 and the core 18 are in the coupled state from the beginning through the pivot joint 19. However, in the fourth embodiment, when the wire corresponding to the wire 12, 24, 17 is separated and configured to produce the anchored state of the mooring portion 10, 25 or the protrusion 16, the wire is used as the anchor 13, 13, The plug 23 or the core 18 and the pivot joint 19 are joined together.

For example, in the case of corresponding to the first embodiment, as shown in FIG. 11A, a protrusion 36 stretched from the anchor 13 is provided so as to project from the distal end surface of the internal passage 14 of the catheter 1.

After that, when the catheter 1 is anchored in the body, a forceps probe 32 having a forceps 35 at its tip is inserted into the internal passage 14 instead of the wire 12 and the forceps 35 make projections 36 as shown in FIG. By holding, the forceps probe 32 and the anchor 13 are in a coupled state.

Thereafter, as in the first embodiment, pulling the forceps probe 32 to the proximal end side of the catheter 1 forms a state in which the anchoring portion 10 is raised, whereby the catheter 1 is anchored in the body. After that, when the administration of the drug by the catheter 1 is finished, as shown in FIG. 11 (d), the raised state of the anchor portion 10 is obtained by pulling the forceps probe 32 further to the proximal end of the catheter 1. Inclined distally to facilitate withdrawal of the catheter 1 from the body.

As described above, the fourth embodiment can be applied to the second and third embodiments by using the wire rods 17 and 24 as the above-described forceps probes. Moreover, in Embodiment 4 mentioned above, although an example of the coupling | bonding by the processus | protrusion 36 and the forceps 35 was shown, it does not restrict to this, for example, wire rod 12,17,24, anchor 13, core 18, and rotation joint 19 , And the hooks in which the plug 23 engages with each other.

Further, in FIG. 3B, the medicine discharge hole 9 → the mooring portion 10 → the anchor 13 is disposed from the proximal end side, but this disposition is arbitrary, and for example, as shown in FIG. From the side, the mooring portion 10 → the drug discharge hole 9 → the anchor 13 may be sequentially arranged, or as shown in FIG. 13, from the base end side, the mooring portion 10 → anchor 13 → the drug discharge hole 9 is sequentially arranged May be

By the way, in the first to fourth embodiments described above, the anchor portion 10 is raised using the wire rods 12, 17, 24 or the insulator probe 32. However, the present invention is not limited to this, the wire rods 12, 17, 24, or insulators For example, as shown in FIG. 14, a wire or the like may not be provided in the inner passage 14 without using the probe 32. In this case, the delivery portion 41 on the proximal side of the anchoring portion 10 and / or the puncture portion 42 on the distal end side are relatively extended or contracted by raising or lowering the anchoring portion 10 as shown by the arrows. Become.

The first to fourth embodiments and the modifications described above can be combined as appropriate.

Reference Signs List 1 catheter 2 tube 3 drug administration device main body 4 internal organ 5 affected area 6 body surface 7 stopper 8 drug administration portion 9 drug ejection hole 10, 25 anchored portion 11 tip portion 11 c cover portion 12, 17, 24 wire rod 13 anchor 14 internal passage 15 , 27 thin film portion 16 protrusion portion 18 core 19 rotation joint 20 intermediate stopper 21 tip stopper 22 contact projection 23 plug 28 contact step 32 forceps probe 35 forceps 36 projection 41 delivery portion 42 puncture portion

Claims (12)

A catheter for guiding drugs into the body of mammals including humans,
What is claimed is: 1. A catheter comprising a anchoring portion provided on the side of the catheter and having a shape changed by manipulation from outside the body to anchor the catheter in the body. A tube for introducing the drug into the body,
A drug administration unit provided at the tip of the tube and having at least one drug discharge hole for discharging the drug introduced into the tube into the body;
Equipped with
The catheter according to claim 1, wherein the anchoring portion is provided in the drug administration portion. The distal end is attached to a predetermined site of the catheter, the proximal end is outside the body, and comprises a wire disposed along the catheter;
The catheter according to claim 1, wherein the shape of the anchor portion is changed by advancing or retracting the wire from the attachment position of the wire with respect to the catheter on the proximal side. The catheter according to claim 3, wherein the wire is a metal wire. The anchoring portion is provided on the catheter proximal to the attachment position of the wire, and is a portion that is more flexible than other portions of the catheter,
By pulling the wire toward the proximal end with respect to the catheter on the proximal side from the attachment position of the wire to the catheter, the anchoring portion which is the flexible portion is compressed, and the anchoring portion is outside the diameter The catheter according to claim 3, characterized in that it bulges in a direction. The mooring section is
A projection projecting outward from the catheter;
A core material provided inside the protrusion;
A joint pivotally attaching the core to the wire;
Equipped with
The core is rotated relative to the wire by pulling the wire toward the proximal side with respect to the catheter on the proximal side from the attachment position of the wire to the catheter, and the core relative to the axial direction of the catheter The catheter according to claim 3, wherein an angle formed by the projecting direction of the projecting portion changes. A separable tip at the tip,
A projection provided in the inner passage,
And further
The wire is attached at its distal end to the distal end, the proximal end is located outside the body through the internal passage of the catheter,
The anchoring portion is provided on the catheter proximal to the protrusion, and is a portion that is more flexible than other portions of the catheter,
By pulling the wire toward the proximal end with respect to the catheter, the distal end is locked at the projection when the distal end moves proximally through the internal passage in the catheter. The catheter according to claim 3, characterized in that compressed pressure is applied to the anchoring portion which is the flexible portion, and the anchoring portion bulges in the radially outward direction. The tip end is a puncturing portion with a pointed tip,
8. The apparatus according to claim 7, wherein all the puncturing portions of the tip end portion are accommodated in the inner passage of the catheter in a state where the tip end portion is locked by the projection portion. catheter. And a coupled portion attached to a predetermined portion of the catheter and capable of being coupled or engaged with the wire in an inner passage of the catheter;
By pushing or pulling the wire coupled or engaged with the coupled portion toward the proximal side, the coupled position or engaged position is advanced or retracted relative to the catheter on the proximal side to thereby hold the anchoring portion. The catheter according to claim 1, wherein the shape of is changed. A delivery portion which is proximal to the catheter from the anchoring portion and which delivers a drug toward the distal direction of the catheter;
A distal end portion located closer to the distal end side of the catheter than the anchoring portion;
And have
The catheter according to claim 1, characterized in that the shape of the anchoring portion is changed by relatively moving the delivery portion and the tip portion. A method of inserting a catheter having a wire and a catheter having an anchor portion projecting on the outer surface by pulling the wire into a living tissue, into the body of the catheter,
A puncturing step of puncturing the catheter with a living tissue to position the anchoring portion in the living tissue in a state where the anchoring portion is not protruded;
Fixing the position of the catheter and the living tissue with the anchoring portion by pulling the wire to cause the anchoring portion to protrude;
A method of inserting a catheter into the body, comprising: What is claimed is: 1. A catheter having a wire and an anchor portion in which the protrusion is reduced from the outer surface by pushing or pulling the wire, the catheter anchored to the living tissue being extracted from the living tissue. There,
An anchorage reduction step to hold the proximal end of the catheter and to push or pull the wire to reduce protrusion of the anchor from the outer surface;
Extracting the catheter from the living tissue;
A method of extracting a catheter from the body, comprising:

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