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WO2010116493A1 - Compound needle with lock mechanism - Google Patents

Compound needle with lock mechanism Download PDF

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Publication number
WO2010116493A1
WO2010116493A1 PCT/JP2009/057136 JP2009057136W WO2010116493A1 WO 2010116493 A1 WO2010116493 A1 WO 2010116493A1 JP 2009057136 W JP2009057136 W JP 2009057136W WO 2010116493 A1 WO2010116493 A1 WO 2010116493A1
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WO
WIPO (PCT)
Prior art keywords
needle
cap
lock member
inner needle
tapered
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/JP2009/057136
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French (fr)
Japanese (ja)
Inventor
英也 齋藤
晶洋 猿谷
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Unisis Corp
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Unisis Corp
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Filing date
Publication date
Application filed by Unisis Corp filed Critical Unisis Corp
Priority to JP2009531650A priority Critical patent/JP4550161B1/en
Priority to PCT/JP2009/057136 priority patent/WO2010116493A1/en
Publication of WO2010116493A1 publication Critical patent/WO2010116493A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M25/00—Catheters; Hollow probes
    • A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/06—Body-piercing guide needles or the like
    • A61M25/0606—"Over-the-needle" catheter assemblies, e.g. I.V. catheters

Definitions

  • the present invention relates to a compound needle used for spinal anesthesia and the like.
  • the outer needle is first inserted into the body, and then the thin inner needle is inserted through the outer needle to a predetermined position in the body, and an anesthetic solution is injected from the proximal end side of the inner needle with a syringe. Initially, this type of compound needle did not have a means for fixing the inner needle to the outer needle.
  • the original compound needle of this type does not have a means to fix the inner needle to the outer needle, so that even if the inner needle is inserted through the outer needle until the tip reaches an anesthetic position, the patient's Due to the movement of the body and the operation of connecting the syringe barrel to the proximal end of the inner needle, the position of the tip of the inner needle may shift, and anesthesia may not work as expected, or the anesthetic solution may be wasted. .
  • Patent Document 1 a compound needle shown in Patent Document 1 below has been proposed.
  • This is a compound needle that has a cylindrical base at the proximal end of the outer needle and inserts the inner needle inside from the rear end of the cylindrical base toward the distal direction.
  • a cylindrical cap with a tapered end and a slit in the axial direction is attached to the inside of the cylindrical base of the outer needle base end with Then, when the cylindrical cap is advanced to the distal end side, the distal end portion of the cylindrical cap enters the tapered portion inside the cylindrical base portion to reduce the diameter, and the inserted inner needle is tightened and locked, and the cylindrical cap is retracted. If it does, a front-end
  • This invention makes it a subject to develop the compound needle
  • the present invention relates to a compound needle having an outer needle having a cylindrical base at the proximal end and an inner needle that is inserted from the rear end of the cylindrical base and protrudes from the distal end of the outer needle.
  • An insertion hole through which the inner needle is inserted has a cylindrical shape formed in the axial direction, and an insertion portion in front of the flange portion formed on the outer peripheral surface of the axial intermediate portion is inserted into the cylindrical base portion from the rear,
  • a locking member having a tapered surface whose outer diameter is reduced toward the rear side at the rear end, and a slit in which the cylindrical wall is cut in the axial direction; It has a cylindrical shape, a screw thread is formed on the inner peripheral surface of the front end portion to be screwed with a screw thread formed on the outer peripheral surface of the rear end portion of the cylindrical base portion, and has an insertion hole through which the inner needle is inserted.
  • the taper surface of the lock member enters the taper recess of the cap, the insertion hole of the portion where the taper surface is formed is reduced, and the inserted inner needle is tightened
  • the cap is locked and the cap is rotated in the opposite direction and the cap is retracted, the tapered recess of the cap is retracted with respect to the taper surface of the lock member, the diameter of the insertion hole of the lock member is expanded, and the lock of the inner needle is released.
  • the taper surface of the lock member shrinks and the inner needle is tightened and fixed.
  • the lock member moves forward with the flange contacting the rear end surface of the cylindrical base. Because there is no, the inner needle will not advance unexpectedly.
  • both the outer peripheral surface of the insertion portion of the lock member and the inner peripheral surface of the cylindrical base portion into which the insertion portion is inserted can be tapered. (Claim 2) By doing in this way, the insertion part of a lock member can be easily inserted in the rear-end part of a cylindrical base part.
  • the slit can also be formed in the flange portion. (Claim 3) By doing so, when the cap is advanced to lock the inner needle, the taper surface of the lock member is easily reduced in diameter, and the inner needle can be securely tightened and fixed.
  • the inner needle can be fixed (locked) with respect to the outer needle at an arbitrary position. The position will not shift. Also, when the cap is advanced to lock the inner needle, the taper surface of the lock member shrinks and the inner needle is tightened and fixed. However, the lock member moves forward with the flange contacting the rear end surface of the cylindrical base. Therefore, the inner needle will not move forward unintentionally, so that there is no risk of damaging the nerve tissue and the like, and the drug solution can be reliably injected into a predetermined portion.
  • FIG. 1 It is a top view of compound needle 1 of an example. It is principal part sectional drawing which cut
  • FIG. 1 It is a top view of compound needle 1 of an example. It is principal part sectional drawing which cut
  • FIG. 1 It is a top view of compound needle 1 of an example. It is principal part sectional drawing which cut
  • the compound needle 1 of the embodiment has an outer needle 2 and an inner needle 5.
  • a cylindrical base 3 is fixed to the proximal end of the outer needle 2.
  • the outer needle 2 and the cylindrical base 3 are formed with insertion holes through which the inner needle 5 is inserted over the entire axial direction.
  • the cylindrical base 3 has a thread 3 a on the outer peripheral surface of the cylindrical rear end, which is screwed with the screw 4 a on the inner peripheral surface of the tip of the cap 4. .
  • the insertion portion 7a of the lock member 7 is inserted into the rear end portion.
  • the inner peripheral surface 3b of the portion is tapered so that the inner diameter becomes smaller toward the front side.
  • a blade 3c is fixed to the middle part of the cylindrical base 3 slightly forward.
  • the lock member 7 is made of plastic, has a substantially cylindrical shape, and has an insertion hole 7e through which the inner needle is inserted in the axial direction.
  • a flange portion 7b bulging in an annular shape is formed in the intermediate portion in the axial direction, and an insertion portion 7a to be inserted into the rear end portion of the cylindrical base portion 3 is provided in front of the flange portion 7b.
  • the outer peripheral surface of the insertion portion 7a has a taper shape corresponding to the inner peripheral surface 3b of the cylindrical base 3 and the outer diameter decreases toward the front side.
  • the flange portion 7 b comes into contact with the rear end surface of the cylindrical base portion 3 and the lock member 7 is positioned.
  • a tapered surface 7c having an outer diameter that decreases toward the rear side is formed, and further, three slits 7d in which the cylindrical wall is cut in the axial direction are formed.
  • the slit 7d extends further forward and reaches a part of the flange portion 7b and the insertion portion 7a.
  • the number and length of the slits are appropriately designed so that the insertion hole in the tapered surface 7c can be sufficiently reduced in diameter so that the inner needle can be securely fastened and fixed.
  • the cap 4 is made of plastic and has a substantially cylindrical shape, and a screw thread 4a is formed on the inner peripheral surface of the front end part to be screwed with the screw thread 3a formed on the outer peripheral surface of the rear end part of the cylindrical base part 3.
  • the rear end portion has an insertion hole 4c through which the inner needle 5 is inserted, and a tapered recess 4b in which a tapered surface whose inner diameter is reduced toward the rear side corresponding to the tapered surface 7c of the lock member 7 is formed.
  • FIG. 5 shows a state where the inner needle is not inserted. However, when the inner needle is inserted, the insertion hole 7e in the portion where the tapered surface 7c is formed is appropriately reduced in diameter, and the inner needle is contracted. It is fastened and fixed by the diameter of the insertion hole 7e and is locked.
  • the outer needle 2 (the lock member 7 and the cap 4 are already mounted) is inserted into the patient's body.
  • a stylet (not shown) that closes the hole at the tip of the needle
  • damage to the patient's tissue can be reduced as in the conventional case.
  • the inner needle 5 is inserted through the insertion hole 4c on the rear end side of the cap 4, and the needle tip is advanced to a predetermined position in the patient's body. Even when the inner needle 5 is inserted, a stylet (not shown) that closes the hole at the tip of the inner needle can be used as in the prior art.
  • the cap 4 is rotated to fix the inner needle 5 to the outer needle 2. At this time, there is no possibility that the inner needle 5 moves forward.
  • a syringe (not shown) is connected to the inner needle base 6 on the proximal end side of the inner needle 5 to inject the drug solution into the body.
  • the inner needle that is locked may be removed together with the outer needle, or the cap 4 is rotated to unlock the inner needle 5, the inner needle 5 is removed from the outer needle 2, and finally Alternatively, the outer needle 2 may be removed from the body.
  • the compound needle of the present invention is not limited to the embodiment, and it is needless to say that various modifications can be made within the scope described in the claims.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Pulmonology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

A compound needle in which an inner needle does not advance when a cap is advanced to lock the inner needle. A compound needle provided with an outer needle having a tubular base at the base end of the outer needle, and also with an inner needle inserted from the rear end of the tubular base and protruded from the tip of the outer needle. The compound needle has a lock member having an insertion section located forward of a flange section formed on the outer peripheral surface of an axially intermediate section, a tapered surface provided at the rear end of the lock member and having an outer diameter reduced toward the rear of the lock member, and a slit formed by axially cutting a tube wall of the lock member. The insertion section of the lock member is inserted into the tubular base from behind. When a cap is rotated and advanced toward the front end thereof, the tapered surface of the lock member enters a tapered recess in the cap to reduce the diameter of an insertion hole where the tapered surface is formed. This tightens the inserted inner needle to set the inner needle to a locked state. Because the flange section is in contact with the rear end surface of the tubular base to prevent the lock member from advancing, the inner needle does not unintentionally advance.

Description

ロック機構付複合針Compound needle with lock mechanism

　本発明は、脊髄麻酔などに使用される複合針に関する。 The present invention relates to a compound needle used for spinal anesthesia and the like.

　脊髄麻酔などを行う場合、注射針は細いものを使用した方が手術後の頭痛が軽減されるが、細い注射針のみを体内に差し込むと注射針が折れてしまうおそれがある。そこで、先ず外針を体内に差し込み、その後細い内針を外針の内部を通して体内の所定の位置まで差し込み、内針の基端側から注射筒で麻酔液を注入するのである。当初この種の複合針は、内針を外針に対して固定できる手段を有していなかった。 When performing spinal anesthesia, etc., using a thin needle reduces the headache after surgery, but if only a thin needle is inserted into the body, the needle may break. Therefore, the outer needle is first inserted into the body, and then the thin inner needle is inserted through the outer needle to a predetermined position in the body, and an anesthetic solution is injected from the proximal end side of the inner needle with a syringe. Initially, this type of compound needle did not have a means for fixing the inner needle to the outer needle.

　当初のこの種の複合針は内針を外針に対して固定できる手段を有していないので、外針の中を通して内針をその先端が麻酔する位置に達するまで挿入しても、患者の体の動きや、内針の基端に注射筒を接続する作業によって、内針先端の位置がずれてしまい、麻酔が思うように効かなかったり、麻酔液が無駄になってしまう場合があった。 The original compound needle of this type does not have a means to fix the inner needle to the outer needle, so that even if the inner needle is inserted through the outer needle until the tip reaches an anesthetic position, the patient's Due to the movement of the body and the operation of connecting the syringe barrel to the proximal end of the inner needle, the position of the tip of the inner needle may shift, and anesthesia may not work as expected, or the anesthetic solution may be wasted. .

　このような課題を解決するため、下記特許文献１に示す複合針が提案されている。これは、外針の基端に筒状基部を有し、筒状基部の後端から先端方向に向けて内部に内針を挿通する複合針で、内側に先端側ほど径が細くなるテーパ部が形成された外針基端の筒状基部の内部に、後端方向から、先細りのテーパ状をなし軸方向のスリットが形成された先端部を有する筒状キャップを軸方向に進退自在に装着し、筒状キャップを先端側に進出させると、筒状キャップの先端部が前記筒状基部内側のテーパ部に入り込んで縮径し、挿通した内針を締め付けてロックし、筒状キャップを後退させると先端部が筒状基部内側のテーパ部から後退して拡径し、内針のロックが解除されるものである。 In order to solve such a problem, a compound needle shown in Patent Document 1 below has been proposed. This is a compound needle that has a cylindrical base at the proximal end of the outer needle and inserts the inner needle inside from the rear end of the cylindrical base toward the distal direction. A cylindrical cap with a tapered end and a slit in the axial direction is attached to the inside of the cylindrical base of the outer needle base end with Then, when the cylindrical cap is advanced to the distal end side, the distal end portion of the cylindrical cap enters the tapered portion inside the cylindrical base portion to reduce the diameter, and the inserted inner needle is tightened and locked, and the cylindrical cap is retracted. If it does, a front-end | tip part will recede from the taper part inside a cylindrical base, and will expand in diameter, and the lock | rock of an inner needle will be cancelled | released.

特開２００１－１７８８２３号公報JP 2001-178823 A

　前記特許文献１の複合針は、内針をロックさせるために筒状キャップを前進させると、筒状キャップの先端部が縮径して内針を締め付け固定するので、内針を締め付け固定た状態でさらに前進し、その結果内針も前進することになる。例えば脊髄麻酔において、内針をロックするときに内針が前進してしまい、神経組織に損傷を与えてしまう等のおそれがある。 In the compound needle of Patent Document 1, when the cylindrical cap is advanced to lock the inner needle, the tip of the cylindrical cap is reduced in diameter and the inner needle is fastened and fixed. Therefore, the inner needle is fastened and fixed. As a result, the inner needle moves forward. For example, in spinal anesthesia, when the inner needle is locked, the inner needle may move forward and damage nerve tissue.

　本発明は、内針をロックさせるためにキャップを前進させた場合、内針が前進するおそれのない複合針を開発することを課題とするものである。 This invention makes it a subject to develop the compound needle | hook which does not have a possibility of an inner needle moving forward, when a cap is advanced in order to lock an inner needle.

　本発明は、基端に筒状基部を有する外針と、該筒状基部の後端から挿入して前記外針の先端部から突出させる内針を有する複合針において、
　内針を挿通する挿通孔が軸方向に形成された筒状をなし、その軸方向中間部の外周面に形成されたフランジ部よりも前方の挿入部が前記筒状基部に後方から挿入され、後端部に、後側ほど外径が小さくなるテーパ面と、筒壁が軸方向に切断されたスリットを有するロック部材と、
　筒状をなし、前端部内周面に前記筒状基部の後端部外周面に形成された螺条と螺合する螺条が形成され、後端部に内針を挿通する挿通孔を有すると共に、前記ロック部材のテーパ面に対応するテーパ面が形成されたテーパ凹部を有するキャップを有し、
　前記キャップを回して先端側に進出させると、前記ロック部材のテーパ面が前記キャップのテーパ凹部に入り込んで該テーパ面が形成されている部分の挿通孔を縮径し挿通した内針を締め付けてロックし、前記キャップを反対方向に回して後退させると、前記キャップのテーパ凹部が前記ロック部材のテーパ面に対して後退して前記ロック部材の挿通孔が拡径し内針のロックが解除されることを特徴とする複合針である。（請求項１） The present invention relates to a compound needle having an outer needle having a cylindrical base at the proximal end and an inner needle that is inserted from the rear end of the cylindrical base and protrudes from the distal end of the outer needle.
An insertion hole through which the inner needle is inserted has a cylindrical shape formed in the axial direction, and an insertion portion in front of the flange portion formed on the outer peripheral surface of the axial intermediate portion is inserted into the cylindrical base portion from the rear, A locking member having a tapered surface whose outer diameter is reduced toward the rear side at the rear end, and a slit in which the cylindrical wall is cut in the axial direction;
It has a cylindrical shape, a screw thread is formed on the inner peripheral surface of the front end portion to be screwed with a screw thread formed on the outer peripheral surface of the rear end portion of the cylindrical base portion, and has an insertion hole through which the inner needle is inserted. A cap having a tapered recess formed with a tapered surface corresponding to the tapered surface of the lock member;
When the cap is turned and advanced to the tip side, the taper surface of the lock member enters the taper recess of the cap, the insertion hole of the portion where the taper surface is formed is reduced, and the inserted inner needle is tightened When the cap is locked and the cap is rotated in the opposite direction and the cap is retracted, the tapered recess of the cap is retracted with respect to the taper surface of the lock member, the diameter of the insertion hole of the lock member is expanded, and the lock of the inner needle is released. It is a compound needle characterized by that. (Claim 1)

　内針をロックするためにキャップを前進させると、ロック部材のテーパ面が縮径して内針を締め付け固定するが、ロック部材はフランジ部が筒状基部の後端面に当接して前進することがないので、内針が意に反して前進してしまうことがない。 When the cap is moved forward to lock the inner needle, the taper surface of the lock member shrinks and the inner needle is tightened and fixed. However, the lock member moves forward with the flange contacting the rear end surface of the cylindrical base. Because there is no, the inner needle will not advance unexpectedly.

　本発明において、前記ロック部材の挿入部の外周面と、前記筒状基部の前記挿入部が挿入される内周面を、共に、前側ほど径が小さくなるテーパ状とすることができる。（請求項２）
　このようにすることで、ロック部材の挿入部を筒状基部の後端部に容易に挿入することができる。 In the present invention, both the outer peripheral surface of the insertion portion of the lock member and the inner peripheral surface of the cylindrical base portion into which the insertion portion is inserted can be tapered. (Claim 2)
By doing in this way, the insertion part of a lock member can be easily inserted in the rear-end part of a cylindrical base part.

　また、本発明において、前記スリットを前記フランジ部にも形成することができる。（請求項３）
　このようにすることで、内針をロックするためにキャップを前進させたときロック部材のテーパ面が容易に縮径され、内針を確実に締め付け固定できる。 In the present invention, the slit can also be formed in the flange portion. (Claim 3)
By doing so, when the cap is advanced to lock the inner needle, the taper surface of the lock member is easily reduced in diameter, and the inner needle can be securely tightened and fixed.

　本発明の複合針は、内針を外針に対して任意のところで固定（ロック）できるので、患者の体の動きや、内針の基端に注射筒を接続する作業によって、内針先端の位置がずれてしまうことがない。また、内針をロックするためにキャップを前進させると、ロック部材のテーパ面が縮径して内針を締め付け固定するが、ロック部材はフランジ部が筒状基部の後端面に当接して前進することがないので、内針が意に反して前進してしまうことがないので、神経組織などを傷つけるおそれがなく、確実に所定の部分に薬液を注入できる。 In the compound needle of the present invention, the inner needle can be fixed (locked) with respect to the outer needle at an arbitrary position. The position will not shift. Also, when the cap is advanced to lock the inner needle, the taper surface of the lock member shrinks and the inner needle is tightened and fixed. However, the lock member moves forward with the flange contacting the rear end surface of the cylindrical base. Therefore, the inner needle will not move forward unintentionally, so that there is no risk of damaging the nerve tissue and the like, and the drug solution can be reliably injected into a predetermined portion.

実施例の複合針１の平面図である。It is a top view of compound needle 1 of an example. 複合針１を軸方向に縦断した要部断面図である。It is principal part sectional drawing which cut | disconnected the compound needle | hook 1 to the axial direction. 内針を取り外した複合針１の背面図である。It is a rear view of the compound needle 1 which removed the inner needle. ロック部材７の側面図及び背面図である。It is the side view and back view of the lock member 7. キャップ４を前進させた状態の断面説明図である。It is sectional explanatory drawing of the state which advanced the cap 4. FIG.

　以下、実施例を表した図面に基づいて本発明を詳細に説明する。
　実施例の複合針１は、外針２と内針５を有する。外針２の基端には筒状基部３が固定されている。外針２及び筒状基部３には、その軸方向全体にわたって内針５が挿通される挿通孔が形成されている。筒状基部３はプラスチック製で、図２に示すように、円筒状の後端部の外周面に螺条３ａを有し、これはキャップ４の先端部内周面の螺条４ａと螺合する。後端部の中にはロック部材７の挿入部７ａが挿入される。当該部分の内周面３ｂは前側ほど内径が小さくなるようなテーパ状となっている。筒状基部３のやや前よりの中間部には羽根３ｃが固定されている。外針を穿刺する際、キャップを回して内針を固定する際など、羽根を摘んで作業することで、容易かつ確実にこれらの作業を行うことができる。 Hereinafter, the present invention will be described in detail with reference to the drawings showing examples.
The compound needle 1 of the embodiment has an outer needle 2 and an inner needle 5. A cylindrical base 3 is fixed to the proximal end of the outer needle 2. The outer needle 2 and the cylindrical base 3 are formed with insertion holes through which the inner needle 5 is inserted over the entire axial direction. As shown in FIG. 2, the cylindrical base 3 has a thread 3 a on the outer peripheral surface of the cylindrical rear end, which is screwed with the screw 4 a on the inner peripheral surface of the tip of the cap 4. . The insertion portion 7a of the lock member 7 is inserted into the rear end portion. The inner peripheral surface 3b of the portion is tapered so that the inner diameter becomes smaller toward the front side. A blade 3c is fixed to the middle part of the cylindrical base 3 slightly forward. When the outer needle is punctured, when the cap is turned and the inner needle is fixed, the work can be easily and reliably performed by picking the blade.

　ロック部材７はプラスチック製で、概略円筒状をなしており、軸方向に内針が挿通する挿通孔７ｅが形成されている。軸方向の中間部には、環状に膨出したフランジ部７ｂが形成され、それよりも前方が筒状基部３の後端部内に挿入される挿入部７ａとなっている。挿入部７ａの外周面は筒状基部３の内周面３ｂと対応して、前側ほど外径が小さくなるテーパ状となっている。挿入部７ａを筒状基部３の後端部に挿入すると、フランジ部７ｂが筒状基部３の後端面に当接してロック部材７が位置決めされる。ロック部材７の後端部には、後側ほど外径が小さくなるテーパ面７ｃが形成され、さらに、筒壁が軸方向に切断された３本のスリット７ｄが形成されている。スリット７ｄは、さらに前方に延びていて、フランジ部７ｂ及び挿入部７ａの一部に至っている。スリットの本数や長さは、テーパ面７ｃの部分の挿通孔が充分縮径して内針を確実に締め付け固定できるように、適宜設計される。 The lock member 7 is made of plastic, has a substantially cylindrical shape, and has an insertion hole 7e through which the inner needle is inserted in the axial direction. A flange portion 7b bulging in an annular shape is formed in the intermediate portion in the axial direction, and an insertion portion 7a to be inserted into the rear end portion of the cylindrical base portion 3 is provided in front of the flange portion 7b. The outer peripheral surface of the insertion portion 7a has a taper shape corresponding to the inner peripheral surface 3b of the cylindrical base 3 and the outer diameter decreases toward the front side. When the insertion portion 7 a is inserted into the rear end portion of the cylindrical base portion 3, the flange portion 7 b comes into contact with the rear end surface of the cylindrical base portion 3 and the lock member 7 is positioned. At the rear end portion of the lock member 7, a tapered surface 7c having an outer diameter that decreases toward the rear side is formed, and further, three slits 7d in which the cylindrical wall is cut in the axial direction are formed. The slit 7d extends further forward and reaches a part of the flange portion 7b and the insertion portion 7a. The number and length of the slits are appropriately designed so that the insertion hole in the tapered surface 7c can be sufficiently reduced in diameter so that the inner needle can be securely fastened and fixed.

　キャップ４はプラスチック製で概略円筒状をなし、前端部の内周面に筒状基部３の後端部外周面に形成された螺条３ａと螺合する螺条４ａが形成されている。後端部には、内針５を挿通する挿通孔４ｃを有すると共に、ロック部材７のテーパ面７ｃに対応する後側ほど内径が小さくなるテーパ面が形成されたテーパ凹部４ｂを有する。 The cap 4 is made of plastic and has a substantially cylindrical shape, and a screw thread 4a is formed on the inner peripheral surface of the front end part to be screwed with the screw thread 3a formed on the outer peripheral surface of the rear end part of the cylindrical base part 3. The rear end portion has an insertion hole 4c through which the inner needle 5 is inserted, and a tapered recess 4b in which a tapered surface whose inner diameter is reduced toward the rear side corresponding to the tapered surface 7c of the lock member 7 is formed.

　キャップ４を筒状基部３に対して回転させて前進させると、図５に示されるように、テーパ凹部４ｂのテーパ面がロック部材７のテーパ面７ｃに対して滑りながら前進するので、テーパ面７ｃが縮径するように内側に移動し、これに伴ってテーパ面７ｃが形成されている部分の挿通孔７ｅが縮径する。
　図５は内針が挿通されていない状態を示しているが、内針が挿通されていると、テーパ面７ｃが形成されている部分の挿通孔７ｅが適度に縮径し、内針が縮径した挿通孔７ｅによって締め付け固定され、ロック状態となる。 When the cap 4 is rotated and advanced with respect to the cylindrical base 3, the taper surface of the taper recess 4b advances while sliding with respect to the taper surface 7c of the lock member 7, as shown in FIG. 7c moves inward so as to reduce the diameter, and the insertion hole 7e in the portion where the tapered surface 7c is formed is reduced accordingly.
FIG. 5 shows a state where the inner needle is not inserted. However, when the inner needle is inserted, the insertion hole 7e in the portion where the tapered surface 7c is formed is appropriately reduced in diameter, and the inner needle is contracted. It is fastened and fixed by the diameter of the insertion hole 7e and is locked.

　ロック状態から、キャップ４を逆方向に回転して後退させると、テーパ凹部４ｂのテーパ面がロック部材７のテーパ面７ｃに対して滑りながら後退するので、テーパ面７ｃがその弾性により拡径するように外側に移動して復帰し、挿通孔７ｅによる締め付け固定が解除され、内針がアンロック状態となる。 When the cap 4 is rotated backward in the locked state and retracted, the taper surface of the taper recess 4b retracts while sliding with respect to the taper surface 7c of the lock member 7, so that the taper surface 7c expands due to its elasticity. Thus, it moves outward and returns, the tightening and fixing by the insertion hole 7e is released, and the inner needle is unlocked.

　次に複合針１の使用方法について説明する。まず、外針２のみ（ロック部材７、キャップ４はすでに装着されている）を患者の体内に差し込む。この場合、針先端の穴を塞ぐスタイレット（図示せず）を使用すると患者の組織の損傷を低減できるのは従来と同様である。次ぎに（スタイレットを使用した場合はこれを取り除き）、内針５をキャップ４の後端側の挿通孔４ｃから挿通し、その針先を患者の体内の所定の位置まで進入させる。内針５を挿通するときも、内針の先端の穴を塞ぐスタイレット（図示せず）を使用できるのは従来と同様である。
　次にキャップ４を回転させて内針５を外針２に対して固定する。このとき内針５が前進してしまうおそれがない。そして、スタイレットを使用した場合にはこれを取り除き、内針５の基端側の内針基部６に注射筒（図示せず）を接続し薬液を体内に注入する。注入が完了すると、ロックされたままの内針を外針と一緒に抜き取っても良いし、キャップ４を回転させて内針５のロックを解除し、内針５を外針２から抜き取り、最後に外針２を体内から抜き取るようにしても良い。 Next, a method for using the compound needle 1 will be described. First, only the outer needle 2 (the lock member 7 and the cap 4 are already mounted) is inserted into the patient's body. In this case, if a stylet (not shown) that closes the hole at the tip of the needle is used, damage to the patient's tissue can be reduced as in the conventional case. Next (when the stylet is used, it is removed), the inner needle 5 is inserted through the insertion hole 4c on the rear end side of the cap 4, and the needle tip is advanced to a predetermined position in the patient's body. Even when the inner needle 5 is inserted, a stylet (not shown) that closes the hole at the tip of the inner needle can be used as in the prior art.
Next, the cap 4 is rotated to fix the inner needle 5 to the outer needle 2. At this time, there is no possibility that the inner needle 5 moves forward. When the stylet is used, it is removed, and a syringe (not shown) is connected to the inner needle base 6 on the proximal end side of the inner needle 5 to inject the drug solution into the body. When the injection is completed, the inner needle that is locked may be removed together with the outer needle, or the cap 4 is rotated to unlock the inner needle 5, the inner needle 5 is removed from the outer needle 2, and finally Alternatively, the outer needle 2 may be removed from the body.

　本発明の複合針は実施例に限るものではなく、特許請求の範囲に記載された範囲内において、種々の変形を加えることができるのはもちろんである。 The compound needle of the present invention is not limited to the embodiment, and it is needless to say that various modifications can be made within the scope described in the claims.

　１　複合針
　２　外針
　３　筒状基部
　３ａ　螺条
　３ｂ　内周面
　３ｃ　羽根
　４　キャップ
　４ａ　螺条
　４ｂ　テーパ凹部
　４ｃ　挿通孔
　５　内針
　６　内針基部
　７　ロック部材
　７ａ　挿入部
　７ｂ　フランジ部
　７ｃ　テーパ面
　７ｄ　スリット
　７ｅ　挿通孔 DESCRIPTION OF SYMBOLS 1 Compound needle 2 Outer needle 3 Cylindrical base part 3a Screw 3b Inner peripheral surface 3c Blade | wing 4 Cap 4a Screw 4b Taper recessed part 4c Insertion hole 5 Inner needle 6 Inner needle base 7 Lock member 7a Insertion part 7b Flange part 7c Tapered surface 7d Slit 7e Insertion hole

Claims (3)

　基端に筒状基部を有する外針と、該筒状基部の後端から挿入して前記外針の先端部から突出させる内針を有する複合針において、
　内針を挿通する挿通孔が軸方向に形成された筒状をなし、その軸方向中間部の外周面に形成されたフランジ部よりも前方の挿入部が前記筒状基部に後方から挿入され、後端部に、後側ほど外径が小さくなるテーパ面と、筒壁が軸方向に切断されたスリットを有するロック部材と、
　筒状をなし、前端部内周面に前記筒状基部の後端部外周面に形成された螺条と螺合する螺条が形成され、後端部に内針を挿通する挿通孔を有すると共に、前記ロック部材のテーパ面に対応するテーパ面が形成されたテーパ凹部を有するキャップを有し、
　前記キャップを回して先端側に進出させると、前記ロック部材のテーパ面が前記キャップのテーパ凹部に入り込んで該テーパ面が形成されている部分の挿通孔を縮径し挿通した内針を締め付けてロックし、前記キャップを反対方向に回して後退させると、前記キャップのテーパ凹部が前記ロック部材のテーパ面に対して後退して前記ロック部材の挿通孔が拡径し内針のロックが解除されることを特徴とする複合針。 In a composite needle having an outer needle having a cylindrical base at the proximal end and an inner needle inserted from the rear end of the cylindrical base and protruding from the distal end of the outer needle,
An insertion hole through which the inner needle is inserted has a cylindrical shape formed in the axial direction, and an insertion portion in front of the flange portion formed on the outer peripheral surface of the axial intermediate portion is inserted into the cylindrical base portion from the rear, A locking member having a tapered surface whose outer diameter is reduced toward the rear side at the rear end, and a slit in which the cylindrical wall is cut in the axial direction;
It has a cylindrical shape, a screw thread is formed on the inner peripheral surface of the front end portion to be screwed with a screw thread formed on the outer peripheral surface of the rear end portion of the cylindrical base portion, and has an insertion hole through which the inner needle is inserted. A cap having a tapered recess formed with a tapered surface corresponding to the tapered surface of the lock member;
When the cap is turned and advanced to the tip side, the tapered surface of the lock member enters the tapered recess of the cap, the insertion hole of the portion where the tapered surface is formed is reduced, and the inserted inner needle is tightened. When the cap is locked and the cap is rotated in the opposite direction and the cap is retracted, the tapered recess of the cap is retracted with respect to the taper surface of the lock member, the diameter of the insertion hole of the lock member is expanded, and the lock of the inner needle is released. A compound needle characterized by that. 　前記ロック部材の挿入部の外周面と、前記筒状基部の前記挿入部が挿入される内周面が、共に、前側ほど径が小さくなるテーパ状となっている請求項１に記載の複合針。 2. The composite needle according to claim 1, wherein an outer peripheral surface of the insertion portion of the lock member and an inner peripheral surface into which the insertion portion of the cylindrical base portion is inserted are both tapered toward the front side. . 　前記スリットが前記フランジ部にも形成されている請求項１又は２に記載の複合針。
  The compound needle according to claim 1 or 2, wherein the slit is also formed in the flange portion.
PCT/JP2009/057136 2009-04-07 2009-04-07 Compound needle with lock mechanism Ceased WO2010116493A1 (en)

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JP2021049233A (en) * 2019-09-26 2021-04-01 メディカル・イノベイション株式会社 Introducer needle

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JPH0951954A (en) * 1995-08-15 1997-02-25 Nippon Zeon Co Ltd Guide wire fixture and catheter set including the same
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Publication number Priority date Publication date Assignee Title
EP2591817A1 (en) * 2011-11-11 2013-05-15 Sanofi-Aventis Deutschland GmbH Needle assembly, drug delivery device and needle dispenser
WO2013068414A1 (en) * 2011-11-11 2013-05-16 Sanofi-Aventis Deutschland Gmbh Needle assembly, drug delivery device and needle dispenser
CN104010680A (en) * 2011-11-11 2014-08-27 赛诺菲-安万特德国有限公司 Needle assemblies, drug delivery devices and needle dispensers
JP2021049233A (en) * 2019-09-26 2021-04-01 メディカル・イノベイション株式会社 Introducer needle

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