JP2015188570A - Detention needle for extracorporeal circulation - Google Patents

Detention needle for extracorporeal circulation Download PDF

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JP2015188570A
JP2015188570A JP2014067490A JP2014067490A JP2015188570A JP 2015188570 A JP2015188570 A JP 2015188570A JP 2014067490 A JP2014067490 A JP 2014067490A JP 2014067490 A JP2014067490 A JP 2014067490A JP 2015188570 A JP2015188570 A JP 2015188570A
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needle
portion
outer tube
inner
inner needle
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JP6344944B2 (en )
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敏昭 千葉
Toshiaki Chiba
敏昭 千葉
寛 二村
Hiroshi Futamura
寛 二村
藤原 真人
Masato Fujiwara
真人 藤原
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日機装株式会社
Nikkiso Co Ltd
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M25/00Catheters; Hollow probes
    • A61M25/01Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/06Body-piercing guide needles or the like
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/14Dialysis systems; Artificial kidneys; Blood oxygenators; Reciprocating systems for treatment of body fluids, e.g. single needle systems for haemofiltration, pheris
    • A61M1/30Reciprocating systems, alternately withdrawing blood from and returning it to the patient, e.g. single-lumen-needle dialysis or single needle systems for haemofiltration, pheresis
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/36Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
    • A61M1/3621Extra-corporeal blood circuits
    • A61M1/3653Interfaces between patient blood circulation and extra-corporal blood circuit
    • A61M1/3659Cannulae pertaining to extracorporeal circulation
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M25/00Catheters; Hollow probes
    • A61M25/01Introducing, guiding, advancing, emplacing or holding catheters
    • A61M25/06Body-piercing guide needles or the like
    • A61M25/0612Devices for protecting the needle; Devices to help insertion of the needle, e.g. wings or holders
    • A61M25/0643Devices having a blunt needle tip, e.g. due to an additional inner component
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/158Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M39/00Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
    • A61M39/02Access sites
    • A61M39/06Haemostasis valves, i.e. gaskets sealing around a needle, catheter or the like, closing on removal thereof
    • A61M2039/062Haemostasis valves, i.e. gaskets sealing around a needle, catheter or the like, closing on removal thereof used with a catheter
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M39/00Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
    • A61M39/02Access sites
    • A61M39/06Haemostasis valves, i.e. gaskets sealing around a needle, catheter or the like, closing on removal thereof
    • A61M39/0606Haemostasis valves, i.e. gaskets sealing around a needle, catheter or the like, closing on removal thereof without means for adjusting the seal opening or pressure

Abstract

PROBLEM TO BE SOLVED: To provide a detention needle for extracorporeal circulation which enables each movement operation into a storing position in an inner needle.SOLUTION: A detention needle for extracorporeal circulation comprises: an external cylindrical needle base 15 provided at the rear end of an external cylindrical needle 3; an inner needle base 7 provided at the rear end of an inner needle 2 and insertable into the external cylindrical needle base 15 when the inner needle 2 is inserted into the external cylindrical needle 3; a portion to be locked 34 provided to the inner needle base 7; two locking portions provided to the external cylindrical needle base 15, the portions including a projection position locking portion 35 which can lock the portion to be locked 34 at a projection position, and a storing position locking portion 36 which can lock the portion to be locked 34 at a storing position; an energizing member 31 for energizing the inner needle 2 in a direction moving from the projection position to the storing position; and a locking release operation member 37 for releasing the locking of the portion to be locked 34 and the projection position locking portion 35. When the locking of the projection position locking portion 35 and the portion to be locked 34 is released by the locking release operation member 37, the inner needle 2 moves from the projection position to the storing position by the energizing force of the energizing member 31, thereby the portion to be locked 34 is locked at the storing position locking portion 36.

Description

本発明は、血液の体外循環を行う際に患者の血管に穿刺され、留置して使用する体外循環用留置針に関する。 The present invention is pierced into the patient's blood vessel in performing extracorporeal circulation of blood, to an indwelling needle for extracorporeal circulation for use in indwelling.

従来、血液の体外循環(例えば、透析などの血液浄化治療のために行われる血液体外循環)においては、患者の血管に留置針を穿刺して留置し、この留置針に血液回路を接続する。 Conventionally, blood extracorporeal circulation (e.g., blood extracorporeal circulation is performed for the blood purification therapy such as hemodialysis) in, and placed by puncturing the indwelling needle in the patient's blood vessel, connecting the blood circuit in this indwelling needle. 一般的には、動脈および静脈に留置針を1本ずつ留置し、これらの留置針を血液回路の両血液導出入接手部にそれぞれ接続する。 Generally, the indwelling needle arterial and venous indwelled one by one, these indwelling needle is connected to both blood outlet Nyuse' hand portion of the blood circuit.

そして、留置針については、血管への穿刺時には内針の穿刺部を外筒針から突出し、穿刺後には内針の穿刺部を外筒針内に収納して血管内に留置し、穿刺部による血管の損傷を防ぐことができる構成が提案されている(例えば、特許文献1および特許文献2参照)。 And, for the indwelling needle protrudes a puncture of the inner needle at the time of puncture into a blood vessel from the outside tube needle, after puncturing accommodating the puncture of the inner needle into the outer tube needle indwelled in a blood vessel, the blood vessel by the puncture configuration can prevent the damage has been proposed (e.g., see Patent Document 1 and Patent Document 2).

実用新案登録第3121840号公報 Utility Model Registration No. 3121840 discloses 特開2001−245980号公報 JP 2001-245980 JP

ところが、上記した特許文献に記載の留置針において、内針の穿刺部を突出位置から収納位置へ移動させるには、内針と外筒針との係止を解除してから内針をスライド操作し、穿刺部が収納位置まで到達したら再び内針と外筒針とを係止して移動を規制しなければならず、内針の収納操作に手間が掛かる。 However, in the indwelling needle disclosed in Patent Document described above, in order to move the puncture of the inner needle from the projected position to the retracted position the inner needle slide operation after releasing the locking of the inner needle and the outer tube needle Metropolitan , must restrict the movement engages the inner needle and the outer tube needle Metropolitan again when it reaches the puncturing portion to the storage position, time-consuming in the storage operation of the inner needle. 特に、家庭透析などの場合、患者が留置針を片腕に穿刺した状態で自ら内針の収納操作を行おうとする場合には、留置針を穿刺していない側の片手のみで複雑な操作をしなければならず、患者への負担が大きい。 In particular, in the case of such as home dialysis, when you attempt to storage operation of its own within the needle with the patient was a puncture in one arm of the indwelling needle, a complicated operation only on the side of the one hand you do not puncture the indwelling needle there must, a large burden on the patient.

本発明は、上記した事情に鑑みてなされたものであり、その目的は、内針の収納位置への移動操作を簡単に行うことができる体外循環用留置針を提供しようとするものである。 The present invention has been made in view of the above, an object thereof is intended to provide an indwelling needle for extracorporeal circulation that can perform the move operation of the storage position of the inner needle easily.

本発明は、上記目的を達成するために提案されたものであり、請求項1に記載のものは、先端に開口を有する管状体で形成された外筒針と、該外筒針内に挿通され、先端に穿刺部を有する内針とを備え、前記内針が、前記穿刺部が前記外筒針の先端から突出された突出位置と、前記外筒針内に収納された収納位置との間で移動可能に構成された体外循環用留置針であって、 The present invention has been proposed in order to achieve the above object, the one described in claim 1, an outer tube needle formed by a tubular body having an opening at the tip is inserted into the outer tube needle, and a inner needle having a piercing portion to the tip, the inner needle, and a projecting position that protrudes the puncture unit from the distal end of the outer tube needle, movable between a retracted been stowed position within said outer tube needle a configured indwelling needle extracorporeal circulation in,
前記外筒針の後端に設けられた外筒針基部と、 An outer tube needle base provided at the rear end of the outer tube needle,
前記内針の後端に設けられ、前記外筒針内に前記内針が挿通されたときに前記外筒針基部内に進入可能な内針基部と、 Provided at a rear end of the inner needle, an inner needle base which can enter into the outer tube needle within the base when the inner needle is inserted into the outer tube needle,
前記内針基部または前記外筒針基部のいずれか一方に設けられた被係止部と、他方に設けられて、前記被係止部を前記突出位置で係止可能な突出位置係止部、および前記収納位置で係止可能な収納位置係止部と、 And the engaged portion provided on one of the inner needle base or the outer tube needle base provided on the other, the engaged portion capable of engaging projecting position locking part at the projecting position, and and lockable storage position locking part in the storage position,
前記外筒針基部と前記内針基部との間に配置され、前記内針を前記突出位置から前記収納位置に移動する方向へ付勢する付勢部材と、 Disposed between the inner hub and the outer tube needle base, a biasing member for biasing said inner needle from said projected position in the direction to move to the storage position,
前記被係止部と前記突出位置係止部との係止を解除可能な係止解除操作部材と、を備え、 And an unlocking operation member capable release the engagement between the and the engaged portion the projecting position locking unit,
前記係止解除操作部材により前記突出位置係止部と前記被係止部との係止が解除されると、前記付勢部材の付勢力によって、前記内針が前記突出位置から前記収納位置へ移動し、前記被係止部が前記収納位置係止部に係止されることを特徴とする体外循環用留置針である。 When the locking is released and the engagement releasing operation the projecting position locking part of a member and the engaged portion by the biasing force of the biasing member, the inner needle into the storage position from the projecting position moving said an indwelling needle for extracorporeal circulation, characterized in that the locked portion is locked in the storage position locking unit.

請求項2に記載のものは、前記係止解除操作部材は、前記突出位置係止部によって係止された前記被係止部を外方から押圧可能な状態で配置され、 The pump of Claim 2, wherein the unlocking operation member is disposed in a depressible condition the engaged portion which is engaged by said projecting position locking part from the outside,
前記係止解除操作部材を前記被係止部側へ向けて押圧操作すると、前記被係止部が前記係止解除操作部材から受ける押圧力により移動して前記突出位置係止部から外れることを特徴とする請求項1に記載の体外循環用留置針である。 When pressed toward the locking release operating member to the locked portion side, said the engaged portion is disengaged from the projecting position locking part moves by the pressing force received from the unlocking operation member it is indwelling needle extracorporeal circulation according to claim 1, wherein.

請求項3に記載のものは、前記被係止部は、前記内針基部の外周部に片持ち状態で支持された突起であり、 The pump of Claim 3, wherein the engaged portion is a projection which is supported in a cantilever state to the outer peripheral portion of the inner hub,
前記突出位置係止部および収納位置係止部は、前記内針の移動方向に沿って並ぶ状態で前記外筒針基部に開設された貫通穴であり、 It said projecting position locking unit and housing position locking part is a through hole opened in the outer tube needle base in a state arranged along the moving direction of the inner needle,
前記係止解除操作部材は、前記外筒針基部に片持ち状態で支持された部材であり、前記突出位置係止部に対向する箇所には、前記突出位置係止部内に進入可能な操作突起が突設されたことを特徴とする請求項2に記載の体外循環用留置針である。 The engagement releasing operation member, the outer tube needle is a member which is supported in a cantilever state to the base, at a location opposite to the projecting position locking unit, the projecting position locking unit enters possible operation projections in the is extracorporeal circulation indwelling needle according to claim 2, characterized in that projecting.

請求項4に記載のものは、前記内針を管状体で形成して、血管内に留置されたときに血管内と当該内針の内部空間とを先端開口を介して連通可能とし、 The pump of Claim 4, to form the inner needle in the tubular body, the internal space of the endovascular and the inner needle through a distal opening to enable communication when it is placed in a blood vessel,
前記内針の外周面と当該外筒針の内周面との間に形成される外周空間と、 And an outer peripheral space formed between the outer surface and the inner peripheral surface of the outer tube needle of the inner needle,
該外周空間の両端部を液密状態に閉塞するとともに、前記内針を摺動可能な状態で密着保持する保持部材と、 With closing the both end portions of the outer peripheral space in a liquid-tight state, and the holding member for tightly held within the needle slidable state,
前記外筒針の先端側のうち前記保持部材よりも後方の外周面に形成されて前記外周空間を開放し、血管内に留置されたときに血管内と前記外周空間とを連通する開口部と、を備え、 An opening for communicating the outer peripheral space within the blood vessel when said outer than the holding members of the distal end side is formed on the outer peripheral surface of the rear opening the outer peripheral space of the tube needle, it is placed in a blood vessel, equipped with a,
前記内針の内部空間と血液回路の血液導出入接手部の一端とを前記内針基部により連通可能とし、 And one end of the blood outlet Nyuse' hand portion of the interior space and the blood circuit of the inner needle to enable communication by said hub,
前記外周空間と血液回路の血液導出入接手部の他端とを前記外筒針基部により連通可能とし、 The other end of the blood outlet Nyuse' hand portion of the outer peripheral space with the blood circuit to allow communication by the outer tube needle base,
前記内針基部および前記外筒針基部を介して血液を体外循環可能にすることを特徴とする請求項1から請求項3のいずれかに記載の体外循環用留置針である。 Is extracorporeal circulation indwelling needle according to any one of claims 1 to claim 3, wherein allowing extracorporeal circulation of blood through the inner hub and the outer tube needle base.

請求項5に記載のものは、前記外筒針基部は、前記内針および前記外筒針と同軸上に位置して前記内針基部が進入可能な基部本体と、該基部本体から分岐して前記血液回路の前記血液導出入接手部の他端を接続可能な分岐部とを備えて構成され、前記分岐部の内部には、前記外周空間から分岐して連通する分岐連通空間部を形成し、 The pump of Claim 5, wherein the outer tube needle base, the inner needle and the outer tube needle and the base body which can enter said inner needle base positioned coaxially, the blood is branched from the base body are configured with said blood outlet Nyuse' connectable to the other end of the hand portion branching of the circuit, in the interior of the branch portion, to form a branch communication space portion communicating with the branch from the outer peripheral space,
前記外筒針の前記外筒針基部側に位置する前記保持部材のうち前記外周空間に臨ませた端面を、前記分岐連通空間部の分岐基端側の縁部に揃えて配置して、前記保持部材の前記端面と前記分岐連通空間部の前記縁部とのなす角を鈍角に設定したことを特徴とする請求項4に記載の体外循環用留置針である。 Wherein an end face to face to the outer peripheral space of the holding member, and aligned with the edge of the branched base end side of the branch communication space portion, the holding member located in the outer tube needle proximal of the outer tube needle is extracorporeal circulation indwelling needle according to claim 4, characterized in that the angle between the edge of said end face and the branch communication space portion is set to an obtuse angle.

請求項6に記載のものは、前記外筒針基部は、前記内針および前記外筒針と同軸上に位置して前記内針基部が進入可能な基部本体と、該基部本体から分岐して前記血液回路の前記血液導出入接手部の他端を接続可能な分岐部とを備えて構成され、前記分岐部の内部には、前記外周空間から分岐して連通する分岐連通空間部を形成し、 The pump of Claim 6, wherein the outer tube needle base, the inner needle and the outer tube needle and the base body which can enter said inner needle base positioned coaxially, the blood is branched from the base body are configured with said blood outlet Nyuse' connectable to the other end of the hand portion branching of the circuit, in the interior of the branch portion, to form a branch communication space portion communicating with the branch from the outer peripheral space,
前記外筒針の前記外筒針基部側に位置する前記保持部材と前記分岐連通空間部との間には、前記内針が挿通される内針挿通部を形成し、 Between the holding member and the branch communication space portion positioned in the outer tube needle proximal of the outer tube needle forms the inner needle insertion portion into which the inner needle is inserted,
該内針挿通部のうち前記外周空間に臨ませた端面を前記分岐連通空間部の分岐基端側の縁部に揃えて配置して、前記内針挿通部の前記端面と前記分岐連通空間部の前記縁部とのなす角を鈍角に設定したことを特徴とする請求項4に記載の体外循環用留置針である。 Arranged aligned an end face to face to the outer peripheral space of the inner needle insertion portion to the edge portion of the branched base end side of the branch communication space portion, wherein said end surface of the inner needle insertion section branch communicating space is extracorporeal circulation indwelling needle according to claim 4, characterized in that the angle between the edges is set to an obtuse angle.

請求項7に記載のものは、前記内針挿通部のうち前記内針が挿通される内針挿通孔の内周面と前記内針の外周面との間隙を、血栓となり得る血液の成分が入らない寸法に設定したことを特徴とする請求項6に記載の体外循環用留置針である。 The pump of Claim 7, the gap between the inner peripheral surface and the outer peripheral surface of the inner needle of the inner needle insertion hole through which the inner needle of the inner needle insertion portion is inserted, a component of blood that can be thrombus it was set to a dimension that does not enter an extracorporeal circulation indwelling needle according to claim 6, characterized in.

本発明によれば、以下のような優れた効果を奏する。 The present invention exhibits the following excellent effects.
請求項1に記載の発明によれば、突出位置および収納位置に内針を簡単に移動させることができる。 According to the invention described in claim 1, it is possible to move the inner needle easily the protruding position and the storage position. したがって、内針の移動操作、詳しくは血管への穿刺後に突出位置から収納位置へ移動する操作を迅速に行うことができ、体外循環用留置針の留置準備作業を効率よく実行することができる。 Accordingly, the moving operation of the inner needle, details can be carried out quickly the operation of moving from the protruding position after puncture into a blood vessel to the storage position, it is possible to perform efficiently the indwelling preparation of the indwelling needle extracorporeal circulation. また、配置された内針が不用意にずれてしまうことを阻止することができる。 Further, it is possible to prevent the inner needle which is arranged inadvertently displaced. これにより、体外循環用留置針を血管へ穿刺する際に内針の穿刺部が外筒針内に収納されてしまったり、外筒針を血管内に留置している最中に内針の穿刺部が外筒針の先端から突出してしまったりする不都合をなくすことができる。 Thus, the indwelling needle for extracorporeal circulation or puncture of the inner needle when the puncture into the blood vessel is too long and is housed in the outer tube needle, the puncture of the inner needle while being placed outside tube needle into the blood vessel it is possible to eliminate a disadvantage that the or accidentally protruding from the distal end of the outer tube needle. さらに、係止解除操作部材を操作するだけで内針の収納位置への移動操作を簡単に行うことができる。 Furthermore, it is possible to perform the operation of moving the storage position of the inner needle easily only by operating the unlocking operation member. したがって、体外循環用留置針の留置準備作業を迅速に済ませることができる。 Therefore, it is possible to dispense quickly indwelling preparation of the indwelling needle extracorporeal circulation.

請求項2に記載の発明によれば、係止解除操作部材を被係止部側へ向けて押圧操作すると、被係止部が係止解除操作部材から受ける押圧力により移動して突出位置係止部から外れるので、係止解除操作部材を押すだけで、内針の穿刺部の収納作業を簡単に行うことができる。 According to the invention described in claim 2, when pressed toward the locking release operating member to the locked portion, projecting position engaging moved by the pressing force locked portion receives from the unlocking operation member since out of the stop unit, by simply pressing the latch release operating member, it is possible to perform storage operations of puncture of the inner needle easily.

請求項3によれば、内針の穿刺部の収納作業を簡単に行える構成を簡単に実現することができる。 According to claim 3, it is possible to easily realize a configuration capable of performing storage operations puncture of the inner needle easily.

請求項4に記載の発明によれば、血管への穿刺後に内針を抜き取らずに血液の循環路の一部として活用することができ、血管への穿刺のためだけに用いられる部材を血液の循環路を構成する部材とは別個に備える必要がない。 According to the invention described in claim 4, without disconnecting the inner needle after puncture into a blood vessel it can be utilized as part of the circulation path of the blood, a member used only for puncture into a blood vessel of the blood it is not necessary to separately include the members constituting the circulation path. これにより、針先が太くなり過ぎないダブルルーメン構造の体外循環用留置針を実現することができ、血管への穿刺時に激しい痛みが伴う不都合を抑えることができる。 Thus, it is possible to realize the indwelling needle for extracorporeal circulation of double lumen structure needlepoint is not too thick, it is possible to suppress the inconvenience associated with severe pain during puncture into the blood vessel. また、内針を体外循環用留置針から抜き取る必要がないことから、内針の穿刺部が作業者(血液の体外循環を準備する作業者)に誤って刺さってしまう虞がない。 Further, the inner needle since there is no need to withdraw from the indwelling needle extracorporeal circulation, there is no possibility that the puncturing portion of the inner needle will be stuck by mistake the operator (worker of preparing an extracorporeal blood circulation). さらに、内針を収納位置に移動することで、内針の穿刺部が血管内に露出することを避けることができ、体外循環用留置針の留置中に内針の穿刺部が血管を不用意に傷つける不都合を避けることができる。 Moreover, by moving the inner needle in the storage position, it is possible to prevent the puncture of the inner needle is exposed within the blood vessel, puncture of the inner needle during indwelling of the indwelling needle extracorporeal circulation blood vessel inadvertently it is possible to avoid a disadvantage that hurt.

請求項5に記載の発明によれば、保持部材の端面と分岐連通空間部の縁部とのなす角を鈍角に設定したので、分岐連通空間部の分岐基端側の縁部に鋭角部が形成されたとしても、この鋭角部に血液が接触して血球破壊(溶血)が生じてしまう不都合を、内針を保持する保持部材の一部を利用して避けることができる。 According to the invention of claim 5, since the angle between the end face and the branch communication space portion of the edge portion of the holding member is set to an obtuse angle, the acute angle portion on the edge portion of the branched base end side of the branch communication space portion even if they are formed, a disadvantage that the blood comes into contact hemolysis (hemolysis) occurs in the acute angle portion, it can be avoided by using a part of the holding member for holding the inner needle. また、分岐連通空間部と保持部材との間で血液が滞留し難くなり、滞留によって血栓が発生してしまうこと、さらには血栓が血管内に送られてしまうことを抑制することができる。 Further, the blood becomes difficult to stay between the holding member and the branch communication space portion, the thrombus by retention occurs, and further it is possible to prevent the thrombi will be fed into the vessel.

請求項6に記載の発明によれば、内針挿通部の端面と分岐連通空間部の縁部とのなす角を鈍角に設定したので、分岐連通空間部の分岐基端側の縁部に鋭角部が形成されたとしても、この鋭角部に血液が接触して血球破壊(溶血)が生じてしまう不都合を、簡単な構成の内針挿通部により避けることができる。 According to the invention of claim 6, since the angle between the end face and the branch communication space portion of the edge of the inner needle insertion portion is set to an obtuse angle, an acute angle to the edge of the branched base end side of the branch communication space portion even part is formed, a disadvantage that the blood comes into contact hemolysis (hemolysis) occurs in the acute angle portion, it can be avoided by the inner needle insertion portion of a simple configuration. また、分岐連通空間部と内針挿通部との間で血液が滞留し難くなり、滞留によって血栓が発生してしまうこと、さらには血栓が血管内に送られてしまうことを抑制することができる。 Further, the blood becomes difficult to stay between the branch communication space portion and the inner needle insertion portion, the thrombus occurs by residence, it can be further suppressed that the thrombus will be fed into the vessel .

請求項7に記載の発明によれば、内針挿通部のうち内針が挿通される内針挿通孔の内周面と内針の外周面との間隙を、血栓となり得る血液の成分が入らない寸法に設定したので、内針挿通孔内で血栓が発生してしまう不都合を避けることができる According to the invention described in claim 7, the gap between the inner peripheral surface and the inner needle outer peripheral surface of the inner needle insertion holes among the needle of the inner needle insertion portion is inserted, a component of blood that can be thrombus entering Having set free size, it is possible to avoid a disadvantage that the thrombus within the inner needle insertion hole occurs

体外循環用留置針の外観図である。 It is an external view of the indwelling needle extracorporeal circulation. 体外循環用留置針の断面図であり、(a)は内針を突出位置に移動した状態の断面図、(b)は内針を収納位置に移動した状態の断面図である。 It is a cross-sectional view of the indwelling needle extracorporeal circulation is a cross-sectional view of a state that has moved (a) is a cross sectional view showing a state in which moving the inner needle in the projecting position, (b) is the inner needle in the storage position. 体外循環用留置針の針先の説明図であり、(a)は内針を突出位置に移動した状態の説明図および各位置における断面図、(b)は内針を収納位置に移動した状態の説明図である。 Is an explanatory view of the needle tip of the indwelling needle extracorporeal circulation, (a) shows the cross sectional view in illustration and the position of the state in which moving the inner needle in the projecting position, (b) the state in which moving the inner needle in the storage position it is an illustration of. 分岐部とシール部材との配置を説明する拡大断面図である。 It is an enlarged cross-sectional view for explaining the arrangement of the branch portion and the seal member. 内針配置機構の要部説明図であり、(a)は外観図、(b)は断面図である。 A main part illustrating the inner needle deployment mechanism, (a) shows the external view, (b) is a cross-sectional view. 内針挿通部が形成された外筒針基部の要部説明図である。 It illustrates the main part of the inner needle insertion portion is formed outside tube needle base. 外筒針本体の先端部を縮径して保持部材を形成した体外循環用留置針の針先の説明図であり、(a)は内針を突出位置に移動した状態の説明図および各位置における断面図、(b)は内針を収納位置に移動した状態の説明図である。 In the outer tube needle is an explanatory view of the needle tip of the indwelling needle extracorporeal circulation forming a reduced diameter to the holding member to the front end portion of the main body, (a) shows the state in which moving the inner needle in the projecting position diagram and the position sectional view, illustrates a state in which moving the inner needle in retracted position (b).

以下、本発明を実施するための形態を図面に基づいて説明する。 It will be described below with reference embodiments of the present invention with reference to the drawings.
体外循環用留置針1は、図1および図2に示すように、それぞれ管状体で形成された内針2と外筒針3とを備え、外筒針3内に内針2を挿通して、当該体外循環用留置針1の要部となる針4を二重管構造で構成している。 Extracorporeal circulation indwelling needle 1, as shown in FIGS. 1 and 2, each comprise a inner needle 2 is formed in the tubular body and the outer tube needle 3, and inserting the inner needle 2 into the outer tube needle 3, the the needle 4 which is a main part for extracorporeal circulation indwelling needle 1 is constituted by a double pipe structure. そして、内針2の先端および外筒針3の先端を尖らせて患者の血管に穿刺可能とし、患者の血液を体外循環させる血液回路5に内針2の基端と外筒針3の基端とを接続して、血管と血液回路5との間で血液を循環可能としている。 Then, the inner needle 2 in the distal end and a pointed outer tube needle 3 of the front end to allow puncture into a blood vessel of a patient, the patient's blood proximal end of the inner needle 2 into the blood circuit 5 for extracorporeal circulation and the outer tube needle 3 of the proximal end connect the, thereby enabling circulation of blood between a blood vessel and the blood circuit 5.

内針2は、細長い金属管で構成されており、当該内針2の内部には、血液を通液可能とする内部空間2aを内針2の全長に亘って形成し、内部空間2aの両端には先端開口2bおよび基端開口2cを開設して外方へ開放している。 The inner needle 2 is composed of a elongated metal tube, inside of the inner needle 2, blood was formed over the entire length of the inner space 2a of the inner needle 2 which enables passed through both ends of the inner space 2a are open outward opened front end opening 2b and the proximal opening 2c in. また、内針2のうち先端開口2bが開設された先端(図2(a)中、左端)には穿刺部2dを有している。 Furthermore, (in FIG. 2 (a), the left end) tip end opening 2b of the inner needle 2 is opened and a puncturing unit 2d to.

さらに、内針2の後端、言い換えると基端開口2cが開設された基端(図2(a)中、右端)には内針基部7を備えている。 Furthermore, (in FIG. 2 (a), the right end) rear end of the inner needle 2, in other words end groups proximal end opening 2c is open and includes an inner needle base 7 in. 内針基部7は、内針2と同軸上に位置するプラスチック製の円筒状部材であり、当該内針基部7の内部には内針連通空間部8を形成し、当該内針連通空間部8の内針2側(図2(a)中、左側)を内針2の基端開口2cに連通する一方、内針連通空間部8の中央部を挟んで内針2とは反対側(図2(a)中、右側)を外方へ開放している。 Inner needle base 7 is a plastic cylindrical member located on the inner needle 2 and coaxially in the interior of the inner needle base 7 to form the inner needle communicating space 8, the inner needle communicating space 8 inner needle 2 side (in FIG. 2 (a), the left side) while communicating with the inner needle 2 of proximal end opening 2c to the opposite side (Fig. the inner needle 2 across the central portion of the inner needle communicating space 8 of in 2 (a), it is open on the right side) to the outside. さらに、内針基部7の外周のうち内針連通空間部8の開放口側に位置する箇所には、血液回路5の両端にそれぞれ設けられた血液導出入接手部(ロックリング)5a,5bのうちの一端(図1においては、血液導出入接手部5a)が螺合可能な内針側おねじ部9が形成されている。 Furthermore, the portions located on the mouth opening side in the inner needle communication space portion 8 of the outer periphery of the inner needle base 7, a blood outlet Nyuse' hand portions provided at both ends of the blood circuit 5 (locking ring) 5a, 5b of the (in FIG. 1, a blood outlet Nyuse' hand portion 5a) of which one end can be screwed a inner needle side external thread portion 9 is formed. そして、血液回路5の端部を前記開放口に当接し、この状態で血液導出入接手部5aを内針側おねじ部9へ螺合すると、血液回路5と内針基部7とが液密状態で密着して、血液回路5と内部空間2aとが内針基部7内の内針連通空間部8を介して連通するように構成されている。 Then, an end portion of the blood circuit 5 abuts against the mouth opening, when screwing the blood outlet Nyuse' hand portion 5a to the inner needle side male threaded portion 9 in this state, and the blood circuit 5 and the inner needle base 7 is liquid-tight in close contact state, and is configured to communicate with the blood circuit 5 and the internal space 2a via the inner needle communicating space 8 inside the inner needle base 7.

外筒針3は、血管内に留置可能であり、内針2が内側に挿通されて穿刺部2dが先端から突出可能な外筒針本体13と、当該外筒針3の先端部として外筒針本体13の先端に装着された外筒針先端部14とから構成されている。 Outer tube needle 3 is capable indwelling in a blood vessel, the inner needle 2 puncture 2d is inserted inside the outer tube needle body 13 can be protruded from the distal end, the outer tube needle body 13 as the distal end portion of the outer tube needle 3 and a loaded outer tube needle tip 14. the tip. そして、外筒針3の後端(図2(a)中、右端)には外筒針基部15を接続している。 Then, (in FIG. 2 (a), the right end) the rear end of the outer tube needle 3 is connected to the outer tube needle base 15 in.

外筒針本体13は、図2および図3に示すように、可撓性を有するプラスチック(例えば、ポリプロピレンやポリエチレン)で構成された長尺な円管状の部材で構成された長尺な円管状の部材であり、当該外筒針本体13の外径と外筒針先端部14の外径とを同じ寸法に設定して、外筒針本体13と外筒針先端部14との継ぎ目に段差が形成されることを避けている。 Outer tube needle body 13, as shown in FIGS. 2 and 3, a flexible plastic (e.g., polypropylene or polyethylene) long circular tube made of a member of the configured elongated circular tubular in a member, by setting the outer diameter of the outer tube needle tip 14 of the outer tube needle body 13 to the same dimensions, the step is formed joint between the outer tube needle body 13 and the outer tube needle tip 14 a is avoided. さらに、図3(a)に示すように、外筒針本体13の内径を内針2の外径よりもひと回り大きく設定(言い換えると、内針2の外径が当該外筒針本体13の内径よりもひと回り小さくなるように設定)して、内針2の外周面と外筒針本体13の内周面との間に血液が通過可能な外周空間16の一部(先端側部分)16aを筒状に形成している。 Furthermore, as shown in FIG. 3 (a), in other words slightly set greater than the outer diameter of the inner diameter of the inner needle 2 out tube needle body 13 (rather than the outer diameter of the inner needle 2 is the inner diameter of the outer tube needle body 13 slightly so as set) to reduce the inner and outer peripheral surfaces and the outer tube needle portion (distal portion of the blood can pass through outer peripheral space 16 between the inner peripheral surface of the main body 13 of the needle 2) 16a in a cylindrical shape It is formed. そして、外筒針本体13のうち外筒針先端部14寄りの外周面には、外周空間16を開放する開口部17を複数(本実施形態では4つ)開設し、該開口部17が外筒針3の先端側のうち外筒針先端部14よりも後方(言い換えると、外筒針先端部14よりも外筒針3の基端側にずれた箇所)に位置するように構成されている。 Then, the outer peripheral surface of the inner outer tube needle tip 14 near the outer tube needle body 13, an opening 17 for opening the outer peripheral space 16 a plurality (four in this embodiment) opened, the opening 17 is the outer tube needle 3 rear (in other words, portions which are shifted to the base end side of the outer tube needle 3 than the outer tube needle tip 14) than among outer tube needle tip 14 on the distal end side of which is configured to be positioned. なお、本実施形態においては、外筒針先端部14寄りに2箇所開口部17を開設し、これらの開口部17から数ミリ外筒針基部15側に移動した位置に2箇所開口部17を開設している。 In the present embodiment, it opened the outer tube needle tip 14 closer to the two places opening 17, two places opening 17 opened from the openings 17 to the position moved to several millimeters outside tube needle base 15 side ing. 外筒針先端部14寄りの2箇所の開口部17は、外筒針3の軸方向から見て180度位相がずれて位置し、外筒針基部15寄りの2箇所の開口部17は、外筒針3の軸方向から見て外筒針先端部14寄りの各開口部17から90度位相がずれて位置するように構成されている。 Opening 17 of the two positions of the outer tube needle tip 14 closer, when viewed from the axial direction of the outer tube needle 3 positioned 180 degrees out of phase, the opening 17 of the two positions of the outer tube needle base 15 toward the outer tube needle 3 It is constructed as viewed from the axial direction from the opening 17 of the outer tube needle tip 14 closer to 90 degrees out of phase positioned misaligned.

外筒針本体13の先端部に備えられた外筒針先端部14は、外筒針本体13よりも硬いプラスチックで構成された短尺な円管状の部品であり、先細り形状を呈し、全長が穿刺部2dの長さL1よりも十分に長い寸法L2に設定されている(図3(b)参照)。 Outer tube needle tip 14 provided at the distal end portion of the outer tube needle body 13 is a short circular tubular part made of a hard plastic than the outer tube needle body 13 exhibits a tapered shape, the total length of the puncture section 2d is set to a sufficiently long length L2 than the length L1 (see Figure 3 (b)). したがって、外筒針3は、先端に薄肉テーパ状部を有する。 Thus, the outer tube needle 3 has a thin tapered portion to the tip. また、外筒針先端部14内の貫通空間部14aには、外筒針3内に挿通された内針2の穿刺部2dを収納可能とし、外筒針先端部14の内径を内針2の外径と同じ寸法、あるいは内針2の外径よりも極僅かに大きい寸法に設定し、外筒針先端部14の内周面を内針2の外周面に液密状態、且つ摺動可能な状態で密着させている。 The outer tube needle into the through-space portion 14a in the tip portion 14, the puncture 2d of the inner needle 2 that is inserted into the outer tube needle 3 and can be stored, an outer tube needle outer diameter inner diameter of the inner needle 2 in the distal end portion 14 and set to the same size or only slightly larger than the outer diameter of the inner needle 2, the outer tube needle liquid-tight inner peripheral surface to the outer peripheral surface of the inner needle 2 in the distal portion 14, and in slidable state They are brought into close contact. これにより、外筒針先端部14は、外周空間16の先端部を液密状態に閉塞して内針2の先端開口2bと外周空間16とを連通不能とし、さらには、本発明における保持部材の一部として機能して、内針2の先端部を摺動可能な状態で密着保持している。 Thus, the outer tube needle tip 14, the distal end opening 2b and the outer peripheral space 16 of the inner needle 2 and a communicating impossible to close the front end portion of the outer peripheral space 16 in a liquid-tight state, and further, the holding member of the present invention functions as a part, is in close contact holding the leading end of the inner needle 2 in a slidable state. さらに、外筒針先端部14の基部(外筒針本体13側に位置する端部)には、外筒針本体13内に挿入されるジョイント部14bを縮径して形成し、該ジョイント部14bの外周面と外筒針本体13の内周面とを液密状態で密着させている。 Further, the outer tube needle into the base of the tip portion 14 (end portion located on the outer tube needle body 13 side), the joint portion 14b which is inserted into the outer tube needle body 13 formed reduced in diameter, the outer periphery of the joint portion 14b the surface and the inner peripheral surface of the outer tube needle body 13 are brought into close contact with a liquid-tight state.

なお、外筒針先端部14と外筒針本体13とからなる外筒針3は、例えば、予め準備された外筒針本体13の端部に外筒針先端部14をインサート成型してもよいし、あるいは、外筒針先端部14と外筒針本体13とを予め別個に成形し、外筒針本体13と、該外筒針本体13に挿入されたジョイント部14bとを接着したり溶着したりしてもよい。 The outer tube needle 3 made of the outer tube needle tip 14 and the outer tube needle body 13. may, for example, the outer tube needle tip 14 may be insert-molded to the end portion of the outer tube needle body 13 which is prepared in advance or, previously molded separately of the outer tube needle tip 14 and the outer tube needle body 13, the outer tube needle and main body 13 may or welding or bonding the joint portion 14b which is inserted into the outer tube needle body 13.

外筒針本体13の基端(図2(a)中、右端)に接続された外筒針基部15は、図1および図2に示すように、内針2および外筒針3と同軸上に位置する基部本体21と、該基部本体21から分岐した分岐部22とを一体成型して構成された略y字状のプラスチック製部材であり、基部本体21には、内針2が外筒針3内に挿通された状態で内針基部7を進入させて収納可能とし、分岐部22には血液回路5の端部を接続可能としている。 The proximal end of the outer tube needle body 13 (FIGS. 2 (a) in the right end) outer tube needle base 15 connected to, as shown in FIGS. 1 and 2, located on the inner needle 2 and the outer tube needle 3 coaxially a base body 21, a plastic member having a substantially y-shaped configured by integrally molding a branch portion 22 that branches from the base body 21, the base body 21, the inner needle 2 is outer tube needle 3 is advancing the inner needle base 7 by inserted state and can be rack mounted, the branch portion 22 is set to be connected to an end portion of the blood circuit 5. 具体的に説明すると、基部本体21は、内針2および外筒針3と同軸上に位置する円筒状を呈しており、外筒針3が接続される先端部21aを、内針基部7が収納可能となる基端部21bよりも縮径している。 More specifically, the base body 21 has a cylindrical shape which is located on the inner needle 2 and the outer tube needle 3 coaxially, a front end portion 21a of the outer tube needle 3 is connected, the inner needle base 7 can be stored It is reduced in diameter than the base end portion 21b to be. そして、基部本体21の先端部21aには、内針2を外筒針3内に通す挿通空間部21cを基部本体21の中心軸上に貫通して、挿通空間部21cの内周面と内針2の外周面との間に外周空間16の一部(基部内部分)16bを筒状に形成して外筒針3内の外周空間16の先端側部分16aへ連通している。 Then, the distal end portion 21a of the base body 21, through the insertion space 21c through the inner needle 2 into the outer tube needle 3 on the central axis of the base body 21, the inner and the inner peripheral surface of the insertion space 21c needle some of the outer peripheral space 16 to form a (base inside portion) 16b in a cylindrical shape and communicates with the distal portion 16a of the outer peripheral space 16 of the outer tube needle 3 between the second outer peripheral surface. さらに、基部本体21の基端部21bには、内針基部7よりもひと回り大きな収納空間部21dを形成して挿通空間部21cへ連通している(図2(b)参照)。 Further, the base end portion 21b of the base body 21, and communicates with the insertion space 21c to form a large storage space 21d slightly from the inner needle base 7 (see Figure 2 (b)). また、収納空間部21dのうち当該収納空間部21dの中央部を挟んで基部本体21の先端部21aとは反対側(図2(a)中、右側)を開放し、この開放口から外方に内針側おねじ部9を露出させた状態で収納空間部21dに内針基部7を収納できるように構成されている。 Also, the sides of the central portion of the housing space portion 21d and the leading end portion 21a of the base body 21 opens the opposite side (in FIG. 2 (a), the right side), outwardly from the opening port of the housing space portion 21d It is configured to be housed inner needle base 7 in the housing space portion 21d in a state of exposing the inner needle side externally threaded portion 9 to.

さらに、収納空間部21dと挿通空間部21cとの連通箇所、言い換えると挿通空間部21cのうち内針2が差し入れられる挿通口にはシリコンゴム製などのシール部材23を配置して挿通空間部21cの挿通口を塞いでいる。 Furthermore, communication points between the housing space portion 21d and the insertion space 21c, in other words through space insertion space portion 21c and the sealing member 23 is disposed such silicone rubber is in the insertion opening of needle 2 is posted out of 21c It is blocking the insertion port. また、シール部材23のうち挿通空間部21cの延長線上にはシール貫通孔23aを内針2よりも極僅かに大きい直径で貫通し、シール部材23(詳しくはシール貫通孔23aの内周面)が内針2の外周面に液密状態、且つ摺動可能な状態で密着できるように構成されている。 Moreover, (the inner circumferential surface of the details seal the through-hole 23a) seal on the extension of the insertion space 21c of the member 23 through the polar diameter slightly greater than the inner needle 2 seals the through hole 23a, the sealing member 23 There liquid-tight to the outer peripheral surface of the inner needle 2, and is constructed and to allow contact in a sliding state. これにより、シール部材23は、外周空間16の基端部を液密状態に閉塞して収納空間部21dと外周空間16とを連通不能とし、さらには、本発明における保持部材の一部として機能して、内針2の基端部を摺動可能な状態で密着保持している。 Thus, the sealing member 23, and a housing space portion 21d and the outer peripheral space 16 closes the base end portion of the outer peripheral space 16 in a liquid tight state and a communicating impossible, further functions as a part of the holding member in the present invention and is in close contact holds the base end portion of the inner needle 2 in a slidable state.

そして、基部本体21の先端部21aの外周部には、エラストマー等の軟質材で構成された筒状の突出片基部26を嵌着し、該突出片基部26の外周部から平板状の突出片(針固定用翼部)27を体外循環用留置針1の両側方へ向けて突出し、該突出片27と患者の腕とを粘着テープ等で貼り合わせて体外循環用留置針1を患者に固定できるように構成されている。 Then, the outer peripheral portion of the distal end portion 21a of the base body 21, the tubular projecting piece base 26 made of a soft material such as an elastomer is fitted, flat plate-like projecting piece from the outer periphery of the projecting piece base 26 fixing projecting toward the (needle securing wings) 27 to both sides of the extracorporeal circulation indwelling needle 1, the projecting piece 27 and the indwelling needle 1 for extracorporeal circulation by bonding the arm of the patient with adhesive tape or the like to a patient It is configured to be able. なお、突出片27は、突出片基部26を介さずに外筒針基部15へ直接装着されていてもよいし、あるいは外筒針基部15に一体成型されていてもよい。 Incidentally, the projecting piece 27 may be attached directly to the outer tube needle base 15 without passing through the projecting piece base 26, or the outer tube needle base 15 may be integrally molded.

分岐部22は、基部本体21の先端部21aの側面から分岐して基部本体21の基端部21bの側方へ向かって突出した円筒形状を呈しており、当該分岐部22の内部には、挿通空間部21cから分岐した分岐連通空間部22aを分岐部22の軸方向に沿って形成している。 Branch unit 22 has a cylindrical shape projecting toward the side of the base end portion 21b of the base body 21 branches from the side surface of the distal end portion 21a of the base body 21, the inside of the branch portion 22, the branch communicating space portion 22a branching from the insertion space 21c is formed along the axial direction of the branch portion 22. また、該分岐連通空間部22aのうち分岐部22の突出端側に位置する部分を挿通空間部21c側に位置する部分よりも拡径するとともに突出端から外方へ開放し、分岐部22の外周のうち分岐連通空間部22aの開放口側に位置する箇所には、血液回路5の両端にそれぞれ設けられた血液導出入接手部(ロックリング)5a,5bのうちの他端(図1においては、血液導出入接手部5b)が螺合可能な分岐側おねじ部24が形成されている。 Further, from the projecting end as well as diameter larger than the portion that is located the portion located on the projecting end side of the branch portion 22 into the insertion space 21c side of the branch communication space portion 22a opened outwardly, the branch portion 22 the portion located on the opening port side of the branch communication space portion 22a of the outer peripheral blood derived Nyuse' hand portions provided at both ends of the blood circuit 5 (locking ring) 5a, at the other end (Fig. 1 of 5b is blood outlet Nyuse' hand portion 5b) is threadably branch side externally threaded portion 24 is formed. そして、血液回路5の端部を前記開放口に当接し、この状態で血液導出入接手部5bを分岐側おねじ部24へ螺合すると、血液回路5と分岐部22とが液密状態で密着して、血液回路5と外周空間16とが外筒針基部15内の挿通空間部21cおよび分岐連通空間部22aを介して連通するように構成されている。 Then, an end portion of the blood circuit 5 abuts against the mouth opening, when screwing the blood outlet Nyuse' hand portion 5b to the branch side externally threaded portion 24 in this state, the blood circuit 5 and the branch portion 22 in a liquid tight state close contact with, and is configured such that the blood circuit 5 and the outer peripheral space 16 is communicated via a through-space portion 21c and the branch communication space portion 22a in the outer tube needle base 15. さらに、図4に示すように、分岐連通空間部22aの分岐基端側の縁部22bには、シール部材23のうち外周空間16の基部内部分16bに臨ませた端面23b(図4中、左端面)を揃えて配置して、シール部材23の端面23bと分岐連通空間部22aの縁部22bとのなす角αを鈍角に設定している。 Furthermore, as shown in FIG. 4, the edge portion 22b of the branch base end side of the branch communication space portion 22a, in the end surface 23b (FIG. 4 to face the base in section 16b of the outer peripheral space 16 of the sealing member 23, and aligns left end surface) is set an angle α between the end face 23b of the seal member 23 and the edge portion 22b of the branch communication space portion 22a at an obtuse angle.

このような構成の体外循環用留置針1においては、内針2が外筒針3内に挿通した状態で内針基部7を十分に外筒針3側へ前進すると、図2(a)および図3(a)に示すように、内針2がシール部材23および外筒針先端部14により両端部を保持された状態で突出位置に移動して穿刺部2dが外筒針3から突出し、体外循環用留置針1の針先を血管へ穿刺可能となる。 In such extracorporeal circulation indwelling needle 1 having the configuration, when the inner needle 2 to advance the inner hub 7 to adequately outer tube needle 3 side in a state of being inserted into the outer tube needle 3, FIG. 2 (a) and 3 (a), the protruding puncture 2d moves to the projecting position in a state where the inner needle 2 is held at both ends by a seal member 23 and the outer tube needle tip 14 from the outer tube needle 3, the retention extracorporeal circulation the needle tip of the needle 1 can puncture into the blood vessel. また、内針2が突出位置に位置する状態から内針基部7を引き出すと、図2(b)および図3(b)に示すように、内針2がシール部材23および外筒針先端部14により両端部を保持された状態で収納位置に移動して、穿刺部2dが外筒針3内に収納される。 Also, when the inner needle 2 draw the inner needle base 7 from the state located at the projecting position, FIG. 2 (b) and as shown in FIG. 3 (b), the inner needle 2 the sealing member 23 and the outer tube needle tip 14 and moved to the collapsed position with both ends held by the puncture unit 2d is housed in the outer tube needle 3.

そして、外筒針基部15と内針基部7との間には、内針2を突出位置から収納位置に移動する方向へ付勢するコイルばね等の付勢部材31と、内針2を突出位置または収納位置に配置可能(位置決め可能)とする内針配置機構32とを備えている。 The outside between the tube needle base 15 and the inner needle base 7, a biasing member 31 such as a coil spring for biasing the inner needle 2 from projecting position in a direction to move the retracted position, the projecting position the inner needle 2 or the storage position can be placed and a inner needle deployment mechanism 32, (positionable). 付勢部材31は、収納空間部21d内に配置された部材であり、図2および図4に示すように、一端を外筒針基部15内のシール部材23のうち収納空間部21dに臨ませた端面23cへ係合し、他端を内針基部7へ係合して、付勢部材31の付勢力により内針基部7および内針2を突出位置から収納位置に移動させる方向へ付勢している。 The biasing member 31 is a member disposed in the housing space portion 21d, as shown in FIGS. 2 and 4, to face the one end in the housing space portion 21d of the sealing member 23 of the outer tube needle base 15. engages the end surface 23c, engages the other end to the inner needle base 7, the inner hub 7 and the inner needle 2 is urged from the projected position in the direction to be moved to the collapsed position by the biasing force of the biasing member 31 ing.

内針配置機構32は、体外循環用留置針1のうち内針2を挟んで突出片27とは反対側(言い換えると、体外循環用留置針1を粘着テープで腕に固定したときに腕とは反対側を向く箇所)に配置された構成であり、図5に示すように、内針基部7に設けられた被係止部34と、外筒針基部15に設けられて被係止部34を係止可能な突出位置係止部35および収納位置係止部36と、外筒針基部15に設けられて被係止部34と突出位置係止部35との係止を解除可能な係止解除操作部材37とを備えて構成されている。 Inner needle deployment mechanism 32, the opposite side (in other words the projecting piece 27 across the out inner needle 2 of extracorporeal circulation indwelling needle 1, and arms when the for indwelling needle 1 extracorporeal circulation was fixed to the arm by adhesive tape opposite a configuration which is arranged at a position) facing, as shown in FIG. 5, the engaged portion 34 provided on the inner needle base 7, the locked provided outside tube needle base 15 34 a lockable projecting position locking part 35 and the storage position locking part 36, the outer tube needle releasably locking the engagement between the engaged portion 34 and the projecting position locking part 35 provided on the base portion 15 It is constituted by a release operating member 37. 具体的に説明すると、内針基部7の外周部に、人の指先よりも十分に小さい円形突起状(例えば、直径3〜4mmの円形突起状)の被係止部34を被係止支持腕部39により片持ち状態で支持して収納空間部21d内で揺動可能とし、基部本体21の外周部には、内針2の移動方向に沿って並んだ2つの円形状の貫通穴を開設して収納空間部21dへ連通し、外筒針3側(図5(a)中、左側)に位置する貫通穴を突出位置係止部35とし、収納空間部21dの開放側(図5(a)中、右側)に位置する貫通穴を収納位置係止部36としている。 More specifically, the outer peripheral portion of the inner needle base 7, human sufficiently small circular protruding than the fingertip (e.g., circular projection having a diameter 3-4 mm) the engaged support arms engaged portion 34 of the supported in a cantilever state and pivotable in the storage space portion 21d by section 39, the outer peripheral portion of the base body 21, opening the two circular through-holes aligned along the moving direction of the inner needle 2 and communicates the housing space section 21d, (in FIG. 5 (a), left) outer tube needle 3-side through holes located a projecting position locking part 35, the open side (FIG. 5 (a storage space 21d ) in, and a through hole located on the right side) and the storage position locking part 36. そして、突出位置係止部35および収納位置係止部36の開口寸法を、被係止部34よりもひと回り大きいが人の指先が進入不能な寸法にそれぞれ設定し、さらには、突出位置係止部35および収納位置係止部36の貫通(深さ)寸法は、被係止部34が外部に突出しない程度の寸法を有している。 Then, the opening dimension of the projecting position locking part 35 and the storage position locking part 36, set respectively in the size larger but human fingertips that are impossible enters dimensions than the locked portion 34, further, projecting position locking penetration (depth) dimension of the parts 35 and storage position locking part 36 has a size enough to locked portion 34 does not protrude to the outside. これらの設定により、突出位置係止部35または収納位置係止部36へ係止している被係止部34に人の指先が不用意に触れてしまう不都合、ひいては被係止部34の係止状態が不用意に解除されてしまう不都合を阻止するように構成されている。 These settings disadvantages human fingertips would touch accidentally the locked portion 34 which is locked to the projecting position locking part 35 or the housing position locking part 36, thus engaging the engaging portion 34 stop state is configured to prevent a disadvantage that is released inadvertently.

また、図5(b)に示すように、基部本体21の先端部21aに嵌着された突出片基部26のうち、外筒針基部15を挟んで突出片27とは反対側(図5(b)中、突出片基部26の上側)から係止解除操作部材37を基端部21b側へ片持ち支持状態で延設し、係止解除操作部材37の延設端部(揺動可能な自由端部)のうち基端部21bの外周面に臨む箇所(具体的には、突出位置係止部35に対向する箇所)には、突出位置係止部35内には進入できるが収納位置係止部36内には進入できない操作突起37aを突設している。 Further, as shown in FIG. 5 (b), of the fitting has been projecting piece base 26 to the tip portion 21a of the base body 21, opposite to the protruding piece 27 across the outer tube needle base 15 (FIG. 5 (b ) in, and extending in a support cantilever state from the upper side) of the latch release operating member 37 to the proximal end portion 21b side of the projecting piece base 26, the extension end portion of the latch release operating member 37 (swingable free the locations (specifically facing the outer circumferential surface of the base end portion 21b of the end portion), the portion) opposed to the projecting position locking part 35, it can enter the stowed position engaging the projecting position locking part 35 and projecting the operating projection 37a which can not enter the inside stop portion 36. そして、係止解除操作部材37を突出位置係止部35側へ向けて撓ませれば、突出位置係止部35によって係止される被係止部34を操作突起37aにより基部本体21の外方から押圧できるように構成されている。 Then, if bent toward the unlocking operation member 37 to the extended position locking part 35 side, out of the base body 21 by the operation protrusion 37a of the locked portion 34 to be engaged by a projecting position locking part 35 and it is configured so that it can be pressed from the side. なお、係止解除操作部材37および被係止支持腕部39は、内針基部7や外筒針基部15よりも撓み易い材質(例えば、エラストマーや軟質塩化ビニール樹脂等の軟質材)で形成されることが好適である。 Incidentally, the latch release operating member 37 and engaged support arm portion 39 is formed in an easy material bent than the inner needle base 7 and the outer tube needle base 15 (e.g., an elastomer or a soft vinyl chloride resin or the like soft material) it is preferable.

次に、体外循環用留置針1の作用について説明する。 Next, a description of the operation for extracorporeal circulation indwelling needle 1. なお、体外循環用留置針1においては、予め被係止部34を突出位置係止部35へ係止して内針2を突出位置に配置しておく。 In the extracorporeal circulation indwelling needle 1, previously placed the inner needle 2 in a protruding position engages the previously engaged portion 34 to the projecting position locking part 35.
体外循環用留置針1を用いて患者の血液を体外循環させるには、まず、血液回路5の一端を外筒針基部15へ接続するとともに他端を内針基部7へ接続して、血液回路5の一端には分岐連通空間部22a、外周空間16、開口部17を連通する一方、血液回路5の他端には内針連通空間部8、内部空間2aを連通する。 Using extracorporeal circulation indwelling needle 1 To extracorporeal circulation of the patient's blood, first connect the other end to the inner needle base 7 with connecting one end of the blood circuit 5 outside tube needle base 15, the blood circuit 5 branch communication space portion 22a at one end, the outer peripheral space 16, while communicating the opening 17, the other end of the blood circuit 5 inner needle communicating space 8, which communicates the internal space 2a. 体外循環用留置針1に血液回路5を接続したならば、内針2が突出位置でシール部材23および外筒針先端部14に保持された状態で体外循環用留置針1の先端(具体的には、外筒針先端部14から突出した穿刺部2d)を患者の血管へ穿刺する。 Once connected to the blood circuit 5 for extracorporeal circulation indwelling needle 1, the inner needle 2 is sealing member 23 and the outer tube needle tip 14 while being held for extracorporeal circulation indwelling needle 1 at the tip (specifically in the projecting position punctures the outer tube needle puncture 2d protruding from the tip 14) to the patient's blood vessel. そして、外筒針本体13の側部に開設された開口部17が血管内に到達するまで挿入し、開口部17により血管内と外周空間16とを連通する。 Then, inserted to the opening 17 which is opened to the side of the outer tube needle body 13 has reached into the blood vessel, communicating the intravascular and the outer space 16 by the opening 17.

体外循環用留置針1を血管へ穿刺したならば、内針配置機構32の係止解除操作部材37を被係止部34側へ向けて押圧操作する。 If the for extracorporeal circulation indwelling needle 1 is punctured into a blood vessel, it is pressed toward the unlocking operation member 37 of the inner needle deployment mechanism 32 to the locked portion 34 side. すると、被係止部34が係止解除操作部材37の操作突起37aから受ける押圧力により収納空間部21d側へ移動して突出位置係止部35から外れるとともに被係止支持腕部39が内針基部7側へ撓む。 Then, the engaged portion 34 inner is the engaged support arm portion 39 together with the outside from the pressing force by the housing space portion 21d projecting position engaging moved to the side stop portion 35 which receives from the operating projection 37a of the locking release operating member 37 It flexes needle base 7 side. さらに、被係止部34と突出位置係止部35との係止が解除されたことにより内針基部7および内針2の移動が許容され、内針基部7および内針2が付勢部材31の付勢力により突出位置から収納位置へ移動して、穿刺部2dを外筒針先端部14内へ収納する。 Further, the allowable movement of the inner needle base 7 and the inner needle 2 by the engagement of the engaged portion 34 and the projecting position locking part 35 is released, the inner needle base 7 and the inner needle 2 is urging member by the urging force of 31 to move from the protruding position to the storage position, for accommodating a puncture 2d outside tube needle tip 14. そして、収納位置係止部36に臨んだ被係止部34が撓み状態の被係止支持腕部39の復元力により移動して、図5(b)において二点鎖線で示すように、収納位置係止部36へ係止(収納位置係止部36内に進入)し、内針基部7および内針2が収納位置に停留される。 Then, it faces the storage position locking part 36 is moved by the restoring force of the engaged support arm portion 39 of the bending state is locked portion 34, as indicated by the two-dot chain line in FIG. 5 (b), the housing to the position locking part 36 and locking (enters the storage position locking part 36), the inner needle base 7 and the inner needle 2 is stationary in the storage position. このようにして内針2が収納位置に配置されると、血管が開口部17、外周空間16、分岐連通空間部22aを介して血液回路5の一端に連通する一方、外筒針先端部14、外筒針先端部14内に収納された穿刺部2d、内部空間2a、内針連通空間部8を介して血液回路5の他端に連通する。 In this manner, when the inner needle 2 is arranged in the storage position, the blood vessel opening 17, the outer peripheral space 16, while communicating with one end of the blood circuit 5 through the branch communication space portion 22a, the outer tube needle tip 14, outer tube needle tip is housed in 14 lancing unit 2d, it communicates the inner space 2a, via the inner needle communicating space 8 to the other end of the blood circuit 5. したがって、血管への穿刺後に、内針2を抜き取らずにこれを血液の循環路の一部として活用することができ、血管への穿刺のためだけに用いられる部材を血液の循環路を構成する部材とは別個に備える必要がない。 Therefore, after a puncture into a blood vessel, this without disconnecting the inner needle 2 can be used as part of a circulation path of the blood, a member used only for puncture into a blood vessel constituting the circulation path of the blood it is not necessary to separately include the member. これにより、針先が太くなり過ぎないダブルルーメン構造の体外循環用留置針1を実現することができ、血管への穿刺時に激しい痛みが伴う不都合を抑えることができる。 Thus, it is possible to realize the extracorporeal circulation indwelling needle 1 of the double lumen structure needlepoint is not too thick, it is possible to suppress the inconvenience associated with severe pain during puncture into the blood vessel. また、内針2を外筒針3から抜き取る必要がないことから、穿刺部2dが作業者(血液の体外循環を準備する作業者)に誤って刺さってしまう虞がない。 Moreover, it is not necessary to withdraw the inner needle 2 from the outer tube needle 3, there is no possibility that the puncture 2d become stuck accidentally worker (worker of preparing an extracorporeal blood circulation). さらに、内針2を収納位置に移動することで、穿刺部2dが血管内に露出することを避けることができ、体外循環用留置針1の留置中に穿刺部2dが血管を不用意に傷つける不都合を避けることができる。 Moreover, by moving the inner needle 2 in the storage position, puncture and 2d can be prevented from being exposed within the blood vessel, puncture 2d hurt inadvertently a blood vessel during placement of the extracorporeal circulation indwelling needle 1 it is possible to avoid the inconvenience. また、体外循環用留置針1の血管への穿刺作業が1回で済むため、血管に2本の留置針を穿刺する場合(具体的には、血液を血液回路5に取り込むための留置針と、血液回路5から血管へ戻すための留置針とを別個に穿刺する場合)よりも痛みを感じる回数が少なくて好適である。 Moreover, because it requires pricking operation once to the vessel of the extracorporeal circulation indwelling needle 1, when puncturing the two indwelling needle into a blood vessel (specifically, the indwelling needle for taking blood to the blood circuit 5 , it is suitable for less frequently feel pain than) to separately punctures the indwelling needle for returning from the blood circuit 5 to the vessel.

さらに、体外循環用留置針1に付勢部材31および内針配置機構32を備えたので、突出位置および収納位置に内針2を簡単に移動させることができる。 Furthermore, it is possible because with a biasing member 31 and the inner needle deployment mechanism 32 in the extracorporeal circulation indwelling needle 1, to easily move the inner needle 2 into the projecting position and the storage position. したがって、内針2の移動操作、詳しくは血管への穿刺後に突出位置から収納位置へ移動する操作を迅速に行うことができ、体外循環用留置針1の留置準備作業を効率よく実行することができる。 Accordingly, the moving operation of the inner needle 2, that more information can be carried out quickly the operation of moving from the protruding position after puncture into a blood vessel to the storage position, to perform efficiently indwelling preparation of extracorporeal circulation indwelling needle 1 it can. また、配置された内針2が不用意にずれてしまうことを阻止することができる。 Further, it is possible to prevent the arranged inner needle 2 is inadvertently displaced. これにより、体外循環用留置針1を血管へ穿刺する際に穿刺部2dが外筒針3内に収納されてしまったり、外筒針3を血管内に留置している最中に穿刺部2dが外筒針3の先端から突出してしまったりする不都合をなくすことができる。 Accordingly, or puncture 2d is gone housed in the outer tube needle 3, puncture 2d while being placed outside tube needle 3 into the blood vessel outer when puncturing the for indwelling needle 1 extracorporeal circulation to vessel it is possible to eliminate a disadvantage that the or accidentally protruding from tube needle 3 tip. さらに、係止解除操作部材37を操作するだけで内針2の収納位置への移動操作を簡単に行うことができる。 Furthermore, it is possible to perform the operation of moving the storage position of the inner needle 2 easily only by operating the latch release operating member 37. したがって、体外循環用留置針1の留置準備作業を迅速に済ませることができる。 Therefore, it is possible to dispense quickly indwelling preparation of extracorporeal circulation indwelling needle 1. そして、内針配置機構32では、係止解除操作部材37を被係止部34側へ向けて押圧操作すると、被係止部34が係止解除操作部材37から受ける押圧力により移動して突出位置係止部35から外れるように構成したので、係止解除操作部材37を押すだけで、内針2の穿刺部2dの収納作業を簡単に行うことができる。 Then, the inner needle deployment mechanism 32, when pressed toward the locking release operating member 37 to the engaged portion 34 side, the locked portion 34 is moved by the pressing force received from the unlocking operation member 37 protrudes since it is configured to disengage from the position locking part 35, by simply pressing the latch release operating member 37, it is possible to perform storage operations of the inner needle 2 in the puncture 2d easily. さらに、内針2の穿刺部2dの収納作業を簡単に行える構成を簡単に実現することができる。 Furthermore, it is possible to easily realize a configuration capable of performing storage operations of the inner needle 2 in the puncture 2d easily.

また、係止解除操作部材37が突出位置係止部35と被係止部34との係止のみを解除可能(言い換えると、収納位置係止部36と被係止部34との係止を解除不能)であること、さらには、収納位置係止部36を人の指が進入不能な大きさに設定したことにより、内針2の収納位置での配置が不用意に解除される不都合、ひいては内針2が不用意に外筒針3から脱落して血液の循環路が形成されなくなる不都合を阻止することができる。 Further, when the unlocking operation member 37 can be released only engagement between the projecting position locking part 35 and the locked portion 34 (in other words, the engagement between the stowed position engaging portion 36 and the locked portion 34 it is released impossible), and further, by the storage position locking part 36 is a human finger is set to non-size entry, a disadvantage that the arrangement of a retracted position of the inner needle 2 is released inadvertently, it is possible to prevent a disadvantage that the circulation path is not formed in the blood inner needle 2 by dropping carelessly from the outer tube needle 3 thus.

そして、外筒針3は、長尺な管状の外筒針本体13の先端に外筒針先端部14を装着して構成されるので、外筒針先端部14を外筒針本体13よりも硬い材質で構成し易い。 Then, the outer tube needle 3, because it is constituted by mounting the outer tube needle tip 14 to the distal end of the outer tube needle body 13 of the elongated tubular and constitutes an outer tube needle tip 14 of a harder material than the outer tube needle body 13 easy. したがって、穿刺が容易な外筒針3を実現し易い。 Therefore, puncture realize easy outer tube needle 3 easily. しかも、外筒針先端部14をプラスチック製とすれば、体外循環用留置針1の留置中に患者が体を多少動かして外筒針先端部14が血管の内壁に当接したとしても、血管の内壁が損傷する不都合を生じ難い。 Moreover, if the outer tube needle tip 14 made of plastic, as the outer tube needle tip 14 patients during placement of extracorporeal circulation indwelling needle 1 is slightly moved the body is in contact with the inner wall of the blood vessel, the inner vessel wall but less likely to occur a disadvantage that the damage.

体外循環用留置針1を血管に穿刺して内針2を収納位置へ移動したならば、突出片27を患者の腕に粘着テープなどを用いて固定する。 If the indwelling needle 1 for extracorporeal circulation moves the inner needle 2 pierces the vessel to the storage position, the projecting piece 27 is fixed with adhesive tape or the like to the patient's arm. なお、突出片27の固定は、内針2を収納位置へ移動する前に行ってもよい。 The fixing of the projecting piece 27 may be performed before moving the inner needle 2 to the storage position. そして、血液回路5の途中に接続された血液ポンプ(図示せず)を駆動し、血液を血管と血液回路5との間で体外循環用留置針1を介して循環させる。 Then, by driving the middle to the connected blood pump of the blood circuit 5 (not shown), blood is circulated through the indwelling needle 1 for extracorporeal circulation between the blood vessel and the blood circuit 5. 具体的には、血管内の血液を内針2の先端開口2bから取り込み、内部空間2a、基端開口2c、内針連通空間部8へ通して血液回路5の他端に流入させる。 Specifically, uptake of blood in the blood vessel from the inner needle 2 in the distal end opening 2b, internal space 2a, proximal end opening 2c, through the inner needle communicating space 8 to flow into the other end of the blood circuit 5. また、血液回路5内を通って当該血液回路5の一端から流出する血液を、分岐連通空間部22a、外周空間16へ通して外筒針3の開口部17から吐出し、血管内に戻す。 Further, the blood flowing through the blood circuit 5 from one end of the blood circuit 5, discharged from the opening 17 of the outer tube needle 3 through the branch communication space portion 22a, the outer peripheral space 16, back into the vessel.

あるいは、血管内の血液を外筒針3の開口部17から取り込み、外周空間16、分岐連通空間部22aへ通して血液回路5の一端に流入させる。 Alternatively, the uptake of blood in the blood vessel through the opening 17 of the outer tube needle 3, the outer peripheral space 16, to flow into the one end of the blood circuit 5 through the branch communication space portion 22a. そして、血液回路5内を通って当該血液回路5の他端から流出する血液を、内針連通空間部8、基端開口2c、内部空間2aへ通して内針2の先端開口2bから吐出し、血管内に戻す。 Then, discharge of blood flowing out from the other end of the blood circuit 5 through the blood circuit 5, the inner needle communicating space 8, proximal end opening 2c, from the inner needle 2 in the distal end opening 2b through the internal space 2a , back into the blood vessel. この血液の流れ、すなわち、開口部17が血液を血管から取り込む取込口であり、外筒針先端部14および穿刺部2dが血液回路5を循環した血液を血管へ戻す戻り口であれば、留置中の体外循環用留置針1が不用意に血管から抜けかかって開口部17が露出してしまったとしても、開口部17から血液が流出する不都合を避けることができ、体外循環用留置針1が血管に刺さっている限り、血液回路5からの血液を血管内に戻し続けることができる。 This blood flow, i.e., a inlet of the opening 17 takes in blood from the blood vessel, the blood outer tube needle tip 14 and the puncture 2d has circulated blood circuit 5 as long as the return port for returning to the vessel, indwelling extracorporeal circulation indwelling needle 1 is nearing exits from inadvertently blood vessels as an opening 17 had been exposed in, it is possible to avoid a disadvantage that the blood flows out from the opening 17, the indwelling needle 1 for extracorporeal circulation There long as they stuck in the blood vessel, it is possible to continue to return blood from the blood circuit 5 into a blood vessel.

さらに、体外循環用留置針1を介して血管と血液回路5とを連通すれば、血液の流れ方向に拘らず、連続して血液を循環させることができる。 Furthermore, if via a indwelling needle 1 extracorporeal circulation communicates the blood vessels and the blood circuit 5, regardless of the flow direction of the blood can be circulated blood continuously. したがって、単一の針部に接続された流路を二股に分岐した留置針を用いて血液の取り込みと戻しとを交互に行う間欠動作と比較して、体外循環作業の効率が優れている。 Therefore, as compared with intermittent operation performed alternately and returning blood uptake using an indwelling needle which is branched the connected flow path in a single needle part bifurcated, superior efficiency of extracorporeal circulation work. これにより、血液の体外循環の所要時間(例えば、透析時間)が長引くこと、ひいては血液の体外循環処置を受ける患者が過度な負担を強いられることを抑制することができる。 Thus, the time required for extracorporeal circulation of blood (e.g., dialysis time) protracted, it is possible to suppress that the patient to be thus extracorporeal circulation treatment of blood is forced to excessive burden.

また、内針2の外径を外筒針3の内径よりも小さく設定して、内針2の外周面と外筒針3の内周面との間に外周空間16を筒状に形成したので、外周空間16を簡単な構成で形成することができる。 Further, since the outer diameter of the inner needle 2 is set smaller than the inner diameter of the outer tube needle 3, the outer peripheral space 16 between the outer surface and the inner peripheral surface of the outer tube needle 3 of the inner needle 2 is formed in a cylindrical shape, it is possible to form the outer peripheral space 16 with a simple configuration. また、外周空間16の断面積を広く確保することができ、血液が滞りなく循環し易い構造を実現することができる。 Further, it is possible to secure a wide cross-sectional area of ​​the peripheral space 16, the blood can be achieved smoothly circulate easily structure.

さらに、外筒針基部15の内部においては、分岐連通空間部22aの分岐基端側の縁部22bにシール部材23の端面23bを揃えて配置して、シール部材23の端面23bと分岐連通空間部22aの縁部22bとのなす角αを鈍角に設定しているので、分岐連通空間部22aの分岐基端側の縁部22bに鋭角部が形成されたとしても、この鋭角部に血液が接触して血球破壊(溶血)が生じてしまう不都合を、シール部材23を利用して避けることができる。 Further, the outer in the interior of the tube needle base 15, disposed aligned end face 23b of the seal member 23 to the edge 22b of the branch base end side of the branch communication space portion 22a, the end face 23b and the branch communication space portion of the sealing member 23 since the set 22a the angle α of the edge 22b of the obtuse, even acute angle portion formed at an edge portion 22b of the branch base end side of the branch communication space portion 22a, the blood is brought into contact with the acute angle portion the disadvantage of hemolysis (hemolysis) occurs and can be avoided by using a sealing member 23. また、分岐連通空間部22aとシール部材23との間で血液が滞留し難くなり、滞留によって血液が凝固して血栓が発生してしまうこと、さらには血栓が血管内に送られてしまうことを抑制することができる。 Further, the blood becomes difficult to stay between the branch communication space portion 22a and the seal member 23, the blood is coagulated thrombus by retention occurs, further would be sent thrombus in a blood vessel it can be suppressed.

ところで、上記第1実施形態における体外循環用留置針1では、シール部材23の端面23bを分岐連通空間部22aの縁部22bに揃えて配置して血球破壊や血液凝固を抑制可能としたが、本発明はこれに限定されない。 Incidentally, the in the extracorporeal for indwelling needle 1 of the first embodiment has been arranged by aligning the end face 23b of the seal member 23 to the edge 22b of the branch communication space portion 22a to allow suppressing hemolysis and blood clotting, the present invention is not limited thereto. 例えば、図6に示す第2実施形態の体外循環用留置針1は、基本的には第1実施形態と同じであるが、内針2を保持する保持部材と外周空間16との間に内針挿通部41を備え、該内針挿通部41の端面41bを分岐連通空間部22aの縁部22bに揃えた点で異なる。 For example, extracorporeal circulation indwelling needle 1 of the second embodiment shown in FIG. 6 is basically the inner between the holding member and the outer peripheral space 16 is the same as the first embodiment, for holding the inner needle 2 comprising a needle insertion portion 41, the difference is that aligning the end face 41b of the inner needle insertion portion 41 to the edge 22b of the branch communication space portion 22a. 具体的に説明すると、第2実施形態における外筒針基部15の基部本体21の内部には、図6に示すように、外周空間16のうち内針基部7側の端部を閉塞する保持部材としてОリング43を備え、該Оリング43と分岐連通空間部22aとの間には、内針挿通孔41aが内針2の移動方向に沿って貫通した内針挿通部41を形成し、内針挿通孔41aに内針2を摺動可能な状態で挿通している。 Specifically, in the interior of the base body 21 of the outer tube needle base 15 in the second embodiment, as shown in FIG. 6, as a holding member for closing the ends of the hub 7 side out of the outer peripheral space 16 comprising a О ring 43, the О between the ring 43 and the branch communication space portion 22a forms an inner needle inserted inner needle insertion portion 41 with a hole 41a penetrates along the moving direction of the inner needle 2, the inner needle It is inserted through the inner needle 2 in a slidable state in the insertion hole 41a. そして、内針挿通部41のうち外周空間16に臨ませた端面41b(図6中、左端面)を分岐連通空間部22aの分岐基端側の縁部22bに揃えて配置して、内針挿通部41の端面41bと分岐連通空間部22aの縁部22bとのなす角βを鈍角に設定している。 The inner (in FIG. 6, the left end surface) end face 41b which is faced to the outer peripheral space 16 of the needle insertion portion 41 is disposed by aligning the edges 22b of the branch base end side of the branch communication space portion 22a, the inner needle the angle β between the end face 41b of the insertion portion 41 and the edge portion 22b of the branch communication space portion 22a is set to an obtuse angle. さらに、内針挿通孔41aの内周面と内針2の外周面との間隔を、血栓となり得る血液の成分(血球等)が入らない寸法(例えば、0.1mm以下、好ましくは0.05mm以下)に設定している。 Furthermore, the distance between the inner peripheral surface and the inner needle outer peripheral surface of the second inner needle insertion hole 41a, dimensions components of blood that can be thrombus (blood cells, etc.) from entering (e.g., 0.1 mm or less, preferably 0.05mm is set to below).

このような構成の内針挿通部41を外筒針基部15内に形成すれば、分岐連通空間部22aの分岐基端側の縁部22bに鋭角部が形成されたとしても、この鋭角部に血液が接触して血球破壊(溶血)が生じてしまう不都合を、簡単な構成の内針挿通部41により避けることができる。 By forming the inner needle insertion portion 41 having such a configuration the outer tube needle base 15, even if the acute angle portion is formed at the edge 22b of the branch base end side of the branch communication space portion 22a, the blood in this acute angle portion There a disadvantage that contact with hemolysis (hemolysis) occurs, can be avoided by the inner needle insertion portion 41 of a simple structure. また、分岐連通空間部22aと内針挿通部41との間で血液が滞留し難くなり、滞留によって血栓が発生してしまうこと、さらには血栓が血管内に送られてしまうことを抑制することができる。 Further, the blood becomes difficult to stay between the branch communication space portion 22a and the inner needle insertion portion 41, the thrombus occurs by residence, further to prevent the thrombi will be fed into the vessel can. そして、内針挿通孔41a内で血栓が発生してしまう不都合をも避けることができる。 Then, it is possible to avoid also the disadvantage that thrombus within the inner needle insertion hole 41a occurs.

ところで、上記各実施形態では、内針基部7に被係止部34を備える一方、外筒針基部15に突出位置係止部35および収納位置係止部36を備えたが、本発明はこれに限定されない。 Incidentally, the above-described embodiments, while the inner needle base 7 includes a locked portion 34, is provided with a projecting position locking part 35 and the storage position locking part 36 on the outer tube needle base 15, the present invention is to but it is not limited. 要は、外筒針基部15または内針基部7の一方には被係止部を備え、他方には突出位置係止部および収納位置係止部を備えていればよく、例えば、内針基部7に突出位置係止部および収納位置係止部を備える一方、外筒針基部15に被係止部を備えてもよい。 In short, with one on the locked portion of the outer tube needle base 15 or the inner needle base 7, the other need only comprise a projecting position locking unit and housing position locking unit, for example, the inner hub 7 while having a projecting position locking unit and housing position locking portion may be provided with a locked portion on the outer tube needle base 15. また、上記各実施形態では、被係止部34を円形状の突起で構成し、突出位置係止部35および収納位置係止部36を円形状の貫通穴で構成したが、本発明はこれに限定されない。 In the above embodiments, constitutes an engaged portion 34 with circular protrusions, but the projecting position locking part 35 and the storage position locking part 36 is constituted by circular through holes, the present invention will now but it is not limited to. 要は、突出位置係止部および収納位置係止部に被係止部を係止可能であれば、どのような形状で構成してもよい。 In short, the locked portion in the projecting position locking unit and housing position locking section locking if possible, may be constructed in any shape. 例えば、被係止部、突出位置係止部および収納位置係止部を三角形状、四角形状、テーパ形状の構成要素(突起、凹部、貫通穴等)で構成してもよい。 For example, locked portion, projecting position locking unit and housing position locking section a triangular, quadrilateral, the components of the tapered (projections, recesses, through-holes, etc.) may be constituted by.

また、上記実施形態では、係止解除操作部材37に操作突起37aを突設し、該操作突起37aにより被係止部34を押圧して被係止部34と突出位置係止部35との係止を解除するように構成したが、本発明はこれに限定されない。 In the above embodiment, projecting the operation projection 37a with the engagement releasing operation member 37, of pressing the engaging portion 34 and the locked portion 34 and the projecting position locking unit 35 by the manipulation protrusion 37a It configured to release the engagement, but the present invention is not limited thereto. 要は、係止解除操作部材を操作することにより、被係止部と突出位置係止部との係止を解除することができれば、この係止の解除をどのような機構や動作で実現してもよい。 In short, by operating the latch release operating member, if it is possible to release the engagement between the projecting position locking part locked portion, to achieve the release of the latching mechanism by which and operation it may be.

ところで、上記各実施形態では、被係止支持腕部39が先端側を支点として片持ち状態で被係止部34を支持したが、本発明はこれに限定されない。 Incidentally, the above-described embodiments, the engaged support arm portion 39 is supported to be engaged portion 34 in a cantilever state to the distal end side as a fulcrum, the invention is not limited thereto. 例えば、後端側を支点とした被係止支持腕部によって被係止部を支持してもよい。 For example, it may support the engaged portion by the locking support arm portion which is the fulcrum of the rear end side. この場合、突出位置係止部35と収納位置係止部36との間に対応する空間に被係止支持腕部を配置できるため、空間を有効に利用でき、体外循環用留置針の小型化を図ることができる。 In this case, since it is possible to place the locked support arm portion into the corresponding space between the projecting position locking part 35 housing position locking part 36, it can be effectively used space, miniaturization of the indwelling needle extracorporeal circulation it can be achieved. しかしながら、被係止支持腕部の支点を後端側にすると、付勢部材31からの付勢力により、被係止部34の突出位置係止部35または収納位置係止部36との当接箇所に内針基部7側へ働く力(図5(b)において下向きに働く力が加わり、被係止部34が係止位置から沈む虞がある。このため、安全を期する場合は、上記した実施形態のように先端側を支点とした被係止支持腕部によって被係止支持部を支持することが望ましい。また、被係止部を支持する構成は、被係止支持腕部に限定されない。例えば、ばね等の付勢部材により被係止部が突出位置係止部35または収納位置係止部36側に付勢され、係止解除操作部材37を押圧操作すれば、当該付勢力に抗して係止が解除されるように構成してもよい。 However, the abutment when the rear end side of the fulcrum of the engaged support arm portion, the biasing force from the biasing member 31, a projecting position locking part 35 or the housing position locking part 36 of the engaged portion 34 point force is applied acting downward in a force acting to the inner needle base 7 side (see FIG. 5 (b), the engaging portion 34 there is a fear to sink from the locking position. Thus, if the interest of safety, the it is desirable that the be-engaged support arm portion which is the fulcrum of the distal end side as shown in the embodiments supporting the object to be locked support. the configuration for supporting the locked portion is in the engaged support arm portion not limited. for example, the engaged portion by an urging member such as a spring is biased in the projecting position locking part 35 or the housing position locking part 36 side, when pressing the latch release operating member 37, with the it may be configured to lock is released against the force.

さらに、上記各実施形態では、長尺な管状の外筒針本体13の先端に外筒針先端部14を装着して外筒針3を構成したが、本発明はこれに限定されない。 Furthermore, in each of the above embodiments has been constituting the outer tube needle 3 by mounting the outer tube needle tip 14 to the distal end of the outer tube needle body 13 of the elongated tubular, the present invention is not limited thereto. 例えば、図7に示す第3実施形態のように、管状の外筒針本体13′の先端部を縮径して、保持部材としても機能する外筒針先端部14′を形成して外筒針3′を構成してもよい。 For example, as in the third embodiment shown in FIG. 7, the outer tube needle body 13 of the tubular outer tube needle 3 form a 'a tip of reduced diameter, the outer tube needle tip 14 that also functions as a holding member' ' it may be configured. このような縮径構造で構成された外筒針3′であれば、外筒針先端部14′を外筒針本体13′とは別個に製造する必要がない。 'If the outer tube needle tip 14' such diameter reducing structure outer tube needle 3 composed of need not be manufactured separately from the outer tube needle body 13 '. したがって、製造コストの低減を図ることができる。 Therefore, it is possible to reduce the manufacturing cost.

また、上記各実施形態では、内針2の外径を外筒針3,3′の内径よりも小さく設定して、内針2の外周面と外筒針3,3′の内周面との間に外周空間16を筒状に形成したが、本発明はこれに限定されない。 In the above embodiments, 'it sets smaller than the inner diameter of the outer peripheral surface of the inner needle 2 and the outer tube needle 3,3' the outer diameter of the inner needle 2 outer tube needle 3, 3 between the inner peripheral surface of the to have been formed an outer peripheral space 16 in the tubular, the present invention is not limited thereto. 要は、本発明において血液が通過可能な外周空間16は、内針2の外周面と外筒針3,3′の内周面との間、および挿通空間部21cの内周面と内針2の外周面との間に形成されれば、どのような構成であってもよい。 In short, the outer peripheral space 16 blood can pass in the present invention, between the inner surface of the outer peripheral surface of the inner needle 2 and the outer tube needle 3,3 ', and the insertion space inner circumferential surface and the inner needle 21c 2 if it is formed between the outer surface of, it may be any configuration. 例えば、内針2の外周面に溝を形成したり、平面を形成(内針2の断面がD字形状となる状態に構成)したりして、内針2の外周面と外筒針3,3′の内周面との間、および挿通空間部21cの内周面と内針2の外周面との間に形成された隙間を外周空間16としてもよい。 For example, a groove is formed in the outer peripheral surface of the inner needle 2, forming a plane or by (of the inner needle 2 sectional configuration in a state where a D-shape), the outer peripheral surface of the inner needle 2 and the outer tube needle 3, between the inner peripheral surface of the 3 ', and a gap formed between the inner peripheral surface and the inner peripheral surface of the needle 2 of the insertion space 21c may outer peripheral space 16. しかしながら、前記隙間が狭すぎると、血液が滞留し易くなって血栓が発生する虞がある。 However, if the gap is too narrow, there is a possibility that blood is more likely to stay thrombus occurs. したがって、上記各実施形態に示すように、外周空間16を筒状に形成する方が、血液が滞留し難くて好適である。 Accordingly, as shown in the above embodiments, is better to form the outer peripheral space 16 in the tubular, the blood is suitably difficult to stay.

ところで、上記各実施形態では、本発明における内針配置機構および付勢部材を、内針の内部空間を血液の循環路の一部として利用するダブルルーメン構造の体外循環用留置針に備えたが、本発明はこれに限定されない。 Incidentally, the above-described embodiments, the inner needle deployment mechanism and the biasing member in the present invention, although the internal space of the inner needle with the extracorporeal circulation indwelling needle of double lumen structure used as a part of a circulation path of blood the present invention is not limited thereto. 要は、内針を突出位置に配置して血管内に穿刺し、穿刺後には内針を収納位置に配置して穿刺部を外筒針内に収納する体外循環用留置針であれば、本発明における内針配置機構および付勢部材を適用してもよい。 In short, by arranging the inner needle in the projecting position to the puncture in the blood vessel, if the puncture by arranging the inner needle in the storage position the indwelling needle for extracorporeal circulation for housing in the outer tube needle after puncture, the present invention the inner needle deployment mechanism and the biasing member may be applied in. 例えば、内針の外周面と外筒針の内周面との間には、血管内と連通可能な外周空間が形成されておらず、内針の内部空間のみを血管へ連通可能とした体外循環用留置針に、本発明における内針配置機構および付勢部材を備えてもよい。 For example, between the inner needle outer peripheral surface and the outer tube needle inner peripheral surface of the intravascular communicable with outer circumferential space is not formed, only the internal space of the inner needle was allowed to communicate with each other into a blood vessel extracorporeal circulation to use the indwelling needle may comprise an inner needle deployment mechanism and the biasing member in the present invention. あるいは、血管内と連通可能な内部空間が内針に形成されておらず、内針の外周面と外筒針の内周面との間に形成された外周空間のみを血管へ連通可能とした体外循環用留置針に、本発明における内針配置機構および付勢部材を備えてもよい。 Alternatively, intravascular communicable with interior space is not formed on the inner needle, only the outer peripheral space formed between the inner needle outer peripheral surface and the outer tube needle inner peripheral surface of the possible communication to vascular extracorporeal the circulation indwelling needle may comprise an inner needle deployment mechanism and the biasing member in the present invention.

そして、本発明における体外循環用留置針は、例示した人工透析における血液の体外循環に用いられることに限定されない。 The indwelling needle for extracorporeal circulation in the present invention is not limited to be used for extracorporeal circulation of blood in the illustrated dialysis. 要は、患者の血液を体外循環させるためであれば、どのような場面で用いられてもよく、例えば、血液から特定成分を分離除去するアフェレシス療法にも適用可能である。 In short, if for extracorporeally circulating patient's blood, may be used in any situation, for example, it is also applicable to apheresis separating off certain components from the blood.

さらに、前記した実施の形態は全ての点で例示であって制限的なものではないと考えられるべきである。 Further, the embodiments described above are to be considered and not restrictive in all respects as illustrative. 本発明は、上記した説明に限らず特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内での全ての変更が含まれるものである。 The present invention is defined by the appended claims is not limited to the above description, it is intended to include any modifications within the meaning and range of equivalency of the claims.

1 体外循環用留置針 2 内針 2a 内部空間 2b 先端開口 2c 基端開口 2d 穿刺部 3,3′ 外筒針 4 針 5 血液回路 5a 血液導出入接手部 5b 血液導出入接手部 7 内針基部 8 内針連通空間部 9 内針側おねじ部13,13′ 外筒針本体14,14′ 外筒針先端部 14a 貫通空間部 14b ジョイント部15 外筒針基部16 外周空間 16a 先端側部分 16b 基部内部分17 開口部21 基部本体 21a 先端部 21b 基端部 21c 挿通空間部 21d 収納空間部22 分岐部 22a 分岐連通空間部 22b 縁部23 シール部材 23a シール貫通孔 23b 端面 23c 端面24 分岐側おねじ部26 突出片基部27 突出片31 付勢部材32 内針配置機構34 被係止部35 突出位置係止部36 収納位置係止部37 係止解除操 Internal 1 for extracorporeal circulation indwelling needle 2 in the needle 2a space 2b tip opening 2c proximal end opening 2d puncture 3,3 'outer tube needle 4 needle 5 blood circuit 5a blood outlet Nyuse' hand portion 5b blood outlet Nyuse' hand portion 7 within the hub 8 inner needle communicating space portion 9 in the needle-side male threaded portion 13, 13 'outer tube needle body 14, 14' outer tube needle tip 14a through the space portion 14b joint 15 outer tube needle base 16 outer peripheral space 16a distal portion 16b proximal the portion 17 opening 21 the base body 21a tip 21b proximal end 21c inserted through the space portion 21d housing space portion 22 branch portion 22a branches communication space portion 22b edge 23 sealing member 23a sealing the through-hole 23b end surface 23c end surface 24 branched side externally threaded portion 26 projecting piece base 27 projecting piece 31 urging member 32 in the needle deployment mechanism 34 locked portions 35 projecting position locking part 36 housing position locking part 37 locking release Misao 作部材 37a 操作突起39 被係止支持腕部41 内針挿通部 41a 内針挿通孔 41b 端面43 Оリング Work member 37a operating projection 39 locked support arm portion 41 the needle insertion portion 41a in the needle insertion hole 41b end face 43 o-ring

Claims (7)

  1. 先端に開口を有する管状体で形成された外筒針と、該外筒針内に挿通され、先端に穿刺部を有する内針とを備え、前記内針が、前記穿刺部が前記外筒針の先端から突出された突出位置と、前記外筒針内に収納された収納位置との間で移動可能に構成された体外循環用留置針であって、 An outer tube needle formed by a tubular body having an opening at the tip is inserted into the outer tube needle, and a inner needle having a piercing portion to the tip, the inner needle, the puncture unit from the distal end of the outer tube needle a protruded protruding position, a movably arranged indwelling needle extracorporeal circulation between the housing has been stowed position within said outer tube needle,
    前記外筒針の後端に設けられた外筒針基部と、 An outer tube needle base provided at the rear end of the outer tube needle,
    前記内針の後端に設けられ、前記外筒針内に前記内針が挿通されたときに前記外筒針基部内に進入可能な内針基部と、 Provided at a rear end of the inner needle, an inner needle base which can enter into the outer tube needle within the base when the inner needle is inserted into the outer tube needle,
    前記内針基部または前記外筒針基部のいずれか一方に設けられた被係止部と、他方に設けられて、前記被係止部を前記突出位置で係止可能な突出位置係止部、および前記収納位置で係止可能な収納位置係止部と、 And the engaged portion provided on one of the inner needle base or the outer tube needle base provided on the other, the engaged portion capable of engaging projecting position locking part at the projecting position, and and lockable storage position locking part in the storage position,
    前記外筒針基部と前記内針基部との間に配置され、前記内針を前記突出位置から前記収納位置に移動する方向へ付勢する付勢部材と、 Disposed between the inner hub and the outer tube needle base, a biasing member for biasing said inner needle from said projected position in the direction to move to the storage position,
    前記被係止部と前記突出位置係止部との係止を解除可能な係止解除操作部材と、を備え、 And an unlocking operation member capable release the engagement between the and the engaged portion the projecting position locking unit,
    前記係止解除操作部材により前記突出位置係止部と前記被係止部との係止が解除されると、前記付勢部材の付勢力によって、前記内針が前記突出位置から前記収納位置へ移動し、前記被係止部が前記収納位置係止部に係止されることを特徴とする体外循環用留置針。 When the locking is released and the engagement releasing operation the projecting position locking part of a member and the engaged portion by the biasing force of the biasing member, the inner needle into the storage position from the projecting position move, extracorporeal circulation indwelling needle, characterized in that the object to be locked part is locked in the storage position locking unit.
  2. 前記係止解除操作部材は、前記突出位置係止部によって係止された前記被係止部を外方から押圧可能な状態で配置され、 The engagement releasing operation member is disposed in a depressible condition the engaged portion which is engaged by said projecting position locking part from the outside,
    前記係止解除操作部材を前記被係止部側へ向けて押圧操作すると、前記被係止部が前記係止解除操作部材から受ける押圧力により移動して前記突出位置係止部から外れることを特徴とする請求項1に記載の体外循環用留置針。 When pressed toward the locking release operating member to the locked portion side, said the engaged portion is disengaged from the projecting position locking part moves by the pressing force received from the unlocking operation member extracorporeal circulation indwelling needle according to claim 1, wherein.
  3. 前記被係止部は、前記内針基部の外周部に片持ち状態で支持された突起であり、 The engaged portion is a projection which is supported in a cantilever state to the outer peripheral portion of the inner hub,
    前記突出位置係止部および収納位置係止部は、前記内針の移動方向に沿って並ぶ状態で前記外筒針基部に開設された貫通穴であり、 It said projecting position locking unit and housing position locking part is a through hole opened in the outer tube needle base in a state arranged along the moving direction of the inner needle,
    前記係止解除操作部材は、前記外筒針基部に片持ち状態で支持された部材であり、前記突出位置係止部に対向する箇所には、前記突出位置係止部内に進入可能な操作突起が突設されたことを特徴とする請求項2に記載の体外循環用留置針。 The engagement releasing operation member, the outer tube needle is a member which is supported in a cantilever state to the base, at a location opposite to the projecting position locking unit, the projecting position locking unit enters possible operation projections in the extracorporeal circulation indwelling needle according to claim 2, characterized in that projecting.
  4. 前記内針を管状体で形成して、血管内に留置されたときに血管内と当該内針の内部空間とを先端開口を介して連通可能とし、 Forming said inner needle in the tubular body, the internal space of the endovascular and the inner needle through a distal opening to enable communication when it is placed in a blood vessel,
    前記内針の外周面と当該外筒針の内周面との間に形成される外周空間と、 And an outer peripheral space formed between the outer surface and the inner peripheral surface of the outer tube needle of the inner needle,
    該外周空間の両端部を液密状態に閉塞するとともに、前記内針を摺動可能な状態で密着保持する保持部材と、 With closing the both end portions of the outer peripheral space in a liquid-tight state, and the holding member for tightly held within the needle slidable state,
    前記外筒針の先端側のうち前記保持部材よりも後方の外周面に形成されて前記外周空間を開放し、血管内に留置されたときに血管内と前記外周空間とを連通する開口部と、を備え、 An opening for communicating the outer peripheral space within the blood vessel when said outer than the holding members of the distal end side is formed on the outer peripheral surface of the rear opening the outer peripheral space of the tube needle, it is placed in a blood vessel, equipped with a,
    前記内針の内部空間と血液回路の血液導出入接手部の一端とを前記内針基部により連通可能とし、 And one end of the blood outlet Nyuse' hand portion of the interior space and the blood circuit of the inner needle to enable communication by said hub,
    前記外周空間と血液回路の血液導出入接手部の他端とを前記外筒針基部により連通可能とし、 The other end of the blood outlet Nyuse' hand portion of the outer peripheral space with the blood circuit to allow communication by the outer tube needle base,
    前記内針基部および前記外筒針基部を介して血液を体外循環可能にすることを特徴とする請求項1から請求項3のいずれかに記載の体外循環用留置針。 The inner needle base and extracorporeal circulation indwelling needle according to any one of claims 1 to 3, the blood through the outer tube needle base and said allowing extracorporeal circulation.
  5. 前記外筒針基部は、前記内針および前記外筒針と同軸上に位置して前記内針基部が進入可能な基部本体と、該基部本体から分岐して前記血液回路の前記血液導出入接手部の他端を接続可能な分岐部とを備えて構成され、前記分岐部の内部には、前記外周空間から分岐して連通する分岐連通空間部を形成し、 The outer tube needle base, the inner needle and said outer tube needle and the base body which can enter said inner needle base positioned coaxially, branched from the base body of the blood outlet Nyuse' hand portion of the blood circuit is constituted by a bifurcation connecting to the other end, the interior of the branch portion, to form a branch communication space portion communicating with the branch from the outer peripheral space,
    前記外筒針の前記外筒針基部側に位置する前記保持部材のうち前記外周空間に臨ませた端面を、前記分岐連通空間部の分岐基端側の縁部に揃えて配置して、前記保持部材の前記端面と前記分岐連通空間部の前記縁部とのなす角を鈍角に設定したことを特徴とする請求項4に記載の体外循環用留置針。 Wherein an end face to face to the outer peripheral space of the holding member, and aligned with the edge of the branched base end side of the branch communication space portion, the holding member located in the outer tube needle proximal of the outer tube needle It said end face and extracorporeal circulation indwelling needle according to claim 4, wherein, characterized in that the angle between the edge of the branch communication space portion is set to an obtuse angle.
  6. 前記外筒針基部は、前記内針および前記外筒針と同軸上に位置して前記内針基部が進入可能な基部本体と、該基部本体から分岐して前記血液回路の前記血液導出入接手部の他端を接続可能な分岐部とを備えて構成され、前記分岐部の内部には、前記外周空間から分岐して連通する分岐連通空間部を形成し、 The outer tube needle base, the inner needle and said outer tube needle and the base body which can enter said inner needle base positioned coaxially, branched from the base body of the blood outlet Nyuse' hand portion of the blood circuit is constituted by a bifurcation connecting to the other end, the interior of the branch portion, to form a branch communication space portion communicating with the branch from the outer peripheral space,
    前記外筒針の前記外筒針基部側に位置する前記保持部材と前記分岐連通空間部との間には、前記内針が挿通される内針挿通部を形成し、 Between the holding member and the branch communication space portion positioned in the outer tube needle proximal of the outer tube needle forms the inner needle insertion portion into which the inner needle is inserted,
    該内針挿通部のうち前記外周空間に臨ませた端面を前記分岐連通空間部の分岐基端側の縁部に揃えて配置して、前記内針挿通部の前記端面と前記分岐連通空間部の前記縁部とのなす角を鈍角に設定したことを特徴とする請求項4に記載の体外循環用留置針。 Arranged aligned an end face to face to the outer peripheral space of the inner needle insertion portion to the edge portion of the branched base end side of the branch communication space portion, wherein said end surface of the inner needle insertion section branch communicating space It said edge portion and the extracorporeal circulation indwelling needle according to claim 4, characterized in that the angle is set to an obtuse angle of.
  7. 前記内針挿通部のうち前記内針が挿通される内針挿通孔の内周面と前記内針の外周面との間隙を、血栓となり得る血液の成分が入らない寸法に設定したことを特徴とする請求項6に記載の体外循環用留置針。 Characterized in that set to a dimension that gap and not enter the components of blood that can be thrombosis between the inner peripheral surface and the outer peripheral surface of the inner needle of the inner needle insertion hole through which the inner needle is inserted of the inner needle insertion portion extracorporeal circulation indwelling needle according to claim 6,.
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Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5393686A (en) * 1977-01-26 1978-08-16 Tersteegen Bernd Double tubular catheter
JPS54295U (en) * 1977-06-03 1979-01-05
US4180068A (en) * 1978-04-13 1979-12-25 Motion Control, Incorporated Bi-directional flow catheter with retractable trocar/valve structure
GB2032778A (en) * 1978-10-12 1980-05-14 Avon Medicals Fistula needle
JPS56100066A (en) * 1979-12-28 1981-08-11 Sorenson Research Co Double tube canula for blood sampling and infusion
JPS56139762A (en) * 1980-04-02 1981-10-31 Terumo Corp Catheter detained in blood vessel
JPS6443938U (en) * 1987-09-13 1989-03-16
JPH01212567A (en) * 1988-02-18 1989-08-25 Terumo Corp Catheter needle pipe assembly
US6547762B1 (en) * 1999-05-13 2003-04-15 Mdc Investment Holdings, Inc. Retractable needle medical device
JP2004500218A (en) * 2000-04-18 2004-01-08 エム ディー シー インベストメント ホールディングス インコーポレイテッド Medical devices with a shield with a Shikihari member draw
JP2005279106A (en) * 2004-03-30 2005-10-13 Jms Co Ltd Indwelling needle structure
JP2005534436A (en) * 2002-08-02 2005-11-17 リッギ,ナルディーノ Safe catheter
JP2011045532A (en) * 2009-08-27 2011-03-10 Mitsubishi Pencil Co Ltd Indwelling needle syringe

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5528519B2 (en) * 2012-09-28 2014-06-25 日機装株式会社 Indwelling needle for extracorporeal circulation

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5393686A (en) * 1977-01-26 1978-08-16 Tersteegen Bernd Double tubular catheter
JPS54295U (en) * 1977-06-03 1979-01-05
US4180068A (en) * 1978-04-13 1979-12-25 Motion Control, Incorporated Bi-directional flow catheter with retractable trocar/valve structure
GB2032778A (en) * 1978-10-12 1980-05-14 Avon Medicals Fistula needle
JPS56100066A (en) * 1979-12-28 1981-08-11 Sorenson Research Co Double tube canula for blood sampling and infusion
JPS56139762A (en) * 1980-04-02 1981-10-31 Terumo Corp Catheter detained in blood vessel
JPS6443938U (en) * 1987-09-13 1989-03-16
JPH01212567A (en) * 1988-02-18 1989-08-25 Terumo Corp Catheter needle pipe assembly
US6547762B1 (en) * 1999-05-13 2003-04-15 Mdc Investment Holdings, Inc. Retractable needle medical device
JP2004500218A (en) * 2000-04-18 2004-01-08 エム ディー シー インベストメント ホールディングス インコーポレイテッド Medical devices with a shield with a Shikihari member draw
JP2005534436A (en) * 2002-08-02 2005-11-17 リッギ,ナルディーノ Safe catheter
JP2005279106A (en) * 2004-03-30 2005-10-13 Jms Co Ltd Indwelling needle structure
JP2011045532A (en) * 2009-08-27 2011-03-10 Mitsubishi Pencil Co Ltd Indwelling needle syringe

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