JP4849021B2

JP4849021B2 - Indwelling needle assembly

Info

Publication number: JP4849021B2
Application number: JP2007171427A
Authority: JP
Inventors: 弘三石倉; 徳寛比恵島; 克教河合
Original assignee: Nipro Corp
Current assignee: Nipro Corp
Priority date: 2007-06-29
Filing date: 2007-06-29
Publication date: 2011-12-28
Anticipated expiration: 2027-06-29
Also published as: JP2009005997A

Description

本発明は、輸液や採血の際に血管に穿刺され、留置される留置針組立体に関するものである。 The present invention relates to an indwelling needle assembly that is punctured and placed in a blood vessel during infusion or blood collection.

患者に対して輸液や採血等を行う際には、患者の皮膚を穿刺するための金属性の針（内針）と、その外周に患者の血管に留置するための樹脂製の針（外針）を配置した留置針が用いられることがある。留置針の内針は鋭利な針先を有しており、使用後に外針のみを患者に留置するために内針を外針から抜去する際に、内針の針先による誤穿刺事故が発生するおそれがある。 When performing infusion or blood collection on a patient, a metallic needle (inner needle) for puncturing the patient's skin and a resin needle (outer needle) for placement in the patient's blood vessel on the outer periphery thereof ) May be used. The inner needle of the indwelling needle has a sharp needle tip. When the inner needle is removed from the outer needle to place only the outer needle in the patient after use, an accidental puncture accident occurs due to the needle tip of the inner needle. There is a risk.

これまで使用後の内針の廃棄に関しては、使用前に針を収納していた包装材に再度内針を挿入する、あるいは使用前に針先を覆っていたキャップに内針の針先を再度挿入するなどの措置がとられてきた。しかし、これらの作業に際しても、針先による誤穿刺事故が起こらないよう細心の注意を払う必要があり、誤穿刺事故が発生するリスクそのものを軽減する措置とはいえなかった。
そこで、このような誤穿刺事故を減少させる観点から、近年、内針を外針から抜去する際に、内針の鋭利な針先を外部に暴露させることなく保護する誤穿刺防止機構が設けられた留置針組立体が普及し始めている。 To discard the inner needle after use, insert the inner needle again into the packaging material that had been stored before use, or reinsert the needle tip of the inner needle into the cap that covered the needle tip before use. Measures such as insertion have been taken. However, even in these operations, it is necessary to pay close attention so that an accidental puncture accident caused by the needle tip does not occur, and it cannot be said that it is a measure for reducing the risk of an erroneous puncture accident.
Therefore, from the viewpoint of reducing such erroneous puncture accidents, in recent years, when removing the inner needle from the outer needle, an erroneous puncture prevention mechanism for protecting the sharp needle tip of the inner needle without exposing it to the outside is provided. Indwelling needle assemblies are beginning to become popular.

誤穿刺防止機構としては、例えば、内針上に針の軸方向に摺動しうるよう配置され、針先を内部に収容しうるプロテクタが用いられる。そして、そのようなプロテクタの使用例としては、先端に内方向に付勢された複数のフィンガーを有する円筒状のプロテクタを備えた留置針組立体（例えば、特許文献１参照）や、前方と後方に壁を有する弾性バネクリップからなるプロテクタを備えた留置針組立体（例えば、特許文献２または３参照）などが公知である。 As the erroneous puncture prevention mechanism, for example, a protector that is arranged on the inner needle so as to be slidable in the axial direction of the needle and accommodates the needle tip therein is used. And as an example of use of such a protector, an indwelling needle assembly (for example, refer to patent documents 1) provided with a cylindrical protector which has a plurality of fingers urged inward at the tip, front, back An indwelling needle assembly (see, for example, Patent Document 2 or 3) including a protector made of an elastic spring clip having a wall is well known.

これらの留置針組立体に用いられるプロテクタは、少なくとも針先側（先端側）と針基側（基端側）の二カ所に針が挿通される開口を有し、留置針使用前の状態では外針ハブの内部に係合固定されている。留置針を患者に穿刺した後、内針が外針の基端側から抜去される際にはプロテクタは外針ハブ内に固定された状態が維持されるため、内針の針先はプロテクタの先端側の開口を通過してプロテクタ内に収容され保護される。その後、プロテクタと外針ハブとの固定が解除され、内針とともにプロテクタも外針より完全に抜去される。内針抜去時、針先が先端側の開口を通過するやいなや開口が閉鎖され、針先が再びプロテクタの先端部から外部へ露出することを防止しうるよう、プロテクタの先端部は内方向に付勢された部分を有している。したがって、内針抜去前の状態では、プロテクタの先端部は常に内針の外周面に圧接しており、これが内針上を移動するプロテクタの摺動抵抗を増大させており、針先保護操作に必要な力を増大させている。 The protectors used in these indwelling needle assemblies have openings through which needles are inserted at least at two locations, the needle tip side (tip side) and the needle base side (base end side). It is engaged and fixed inside the outer needle hub. After puncturing the patient with the indwelling needle, when the inner needle is removed from the proximal end of the outer needle, the protector remains fixed in the outer needle hub. It passes through the opening on the distal end side and is housed and protected in the protector. Thereafter, the protector and the outer needle hub are unfixed, and the protector is completely removed from the outer needle together with the inner needle. When removing the inner needle, as soon as the needle tip passes through the opening on the tip side, the opening is closed, and the tip of the protector is attached inward to prevent the needle tip from being exposed to the outside from the tip of the protector again. It has a biased part. Therefore, in the state before the inner needle is removed, the tip of the protector is always in pressure contact with the outer peripheral surface of the inner needle, which increases the sliding resistance of the protector that moves on the inner needle, and prevents the needle tip from being protected. The necessary force is increased.

特開平９−９９０７３号公報JP-A-9-99073 特表２００１−５１４９４３号公報JP-T-2001-514943 特開２００２−２４８１６８号公報JP 2002-248168 A

内針の抜去は、通常医療従事者が片手で行うものであり、内針が外針から抜去されると同時に、あるいは抜去される直前に内針の針先が保護されることが好ましい。しかし、針先の保護に必要な力が大きくなると、針先保護操作が片手で行えないために抜去後直ちに針先を保護することができなくなったり、プロテクタを針先が保護される位置まで完全に摺動できなくなったりして、内針抜去時に針先が患者の血管や皮膚を傷つけたりするおそれがある。
そこで本発明は、内針抜去時に針先が外部に暴露されることなく保護され、なおかつ針先保護操作に必要とされる力が従来よりも小さく、片手での操作が容易である留置針組立体を提供することを目的としている。 The removal of the inner needle is usually performed by a medical worker with one hand, and it is preferable that the tip of the inner needle is protected simultaneously with or just before the inner needle is removed from the outer needle. However, if the force required to protect the needle tip increases, the needle tip protection operation cannot be performed with one hand, so the needle tip cannot be protected immediately after removal or the protector is completely moved to the position where the needle tip is protected. The needle tip may damage the patient's blood vessels and skin when the inner needle is removed.
Accordingly, the present invention provides an indwelling needle assembly in which the needle tip is protected without being exposed to the outside when the inner needle is removed, and the force required for the needle tip protection operation is smaller than in the prior art and is easy to operate with one hand. The purpose is to provide a solid.

本発明者らは鋭意検討を行った結果、プロテクタを保護部材と閉鎖部材の二部材に分けて、内針抜去前にプロテクタ先端部の内方向への付勢力が針の外周面にかからないよう構成することにより、上記課題を解決できることを見出し、本発明に到達した。 As a result of intensive studies, the present inventors have divided the protector into two members, a protective member and a closing member, so that the inward biasing force of the protector tip is not applied to the outer peripheral surface of the needle before the inner needle is removed. As a result, the inventors have found that the above-described problems can be solved, and have reached the present invention.

すなわち本発明は、
（１）先端に鋭利な針先を有し先端近傍に係合部を有する内針と、前記内針の基端部に設けられる内針ハブと、前記内針の外周に配置される外針と、前記外針の基端部に設けられる外針ハブと、前記内針の外周に軸方向に摺動可能に配置される内針の針先保護用プロテクタとを備えてなる留置針組立体において、
前記プロテクタは、内針の針先を収容しうる内部空間を備え内針上を軸方向に摺動しうる保護部材と、前記保護部材の外周に基端から先端まで摺動可能に配置された閉鎖部材とを有してなり、
前記保護部材には、内針を挿通しうる先端側開口と内針本体は挿通しうるが係合部は通過不能な基端側開口が設けられ、先端部には針先が保護部材の内部空間に収容された時に前記先端側開口を閉鎖するよう内方向へ変位しうる変位側壁が設けられており、前記変位側壁は前記閉鎖部材が保護部材の先端部外周に配置されることにより内方向へ変位するものであり、
前記閉鎖部材は、針先が前記保護部材の内部空間に収容される前は保護部材の変位側壁が設けられていない基端部の外周に配置され、針先が前記保護部材の内部空間に収容された時に前記保護部材の外周を先端側へと摺動して保護部材の変位側壁が備えられた先端部の外周に配置されるものであり、
前記プロテクタは、前記内針の針先が前記保護部材の内部空間に収容される前は外針ハブ内に配置され、外針ハブの内周面と閉鎖部材とが係合固定されており、前記係合は、前記内針が前記外針内から基端側へと抜去され、内針の係合部が保護部材の基端側開口に係合することによって保護部材が内針と共に基端側へ移動し、それによって閉鎖部材が摺動して保護部材の先端部外周に配置されるまで維持されており、前記係合は前記閉鎖部材が保護部材の先端部に設けられた係止手段によって係止されることにより解除され、プロテクタの外針ハブ内からの離脱が可能となるものである留置針組立体、
（２）前記プロテクタの保護部材は、基端側開口を有する基端壁と、先端側開口を有する先端壁と、基端壁および先端壁と一体的に設けられる針の軸方向に延びる側壁とを有しており、前記側壁の一部に前記変位側壁が設けられてなる（１）記載の留置針組立体、
（３）前記プロテクタの保護部材は、対向する一対の側壁を有しており、前記側壁の一方の先端部が変位側壁である（２）記載の留置針組立体、
（４）前記プロテクタの保護部材は、針先を四方から包囲する４枚の側壁を有しており、前記側壁の対向する一対の先端部に一対の変位側壁が設けられてなる（２）記載の留置針組立体、
（５）前記プロテクタの閉鎖部材は、前記保護部材の基端を挿通するために必要な内径よりもわずかに小さい内径を有する開口部を備え、内方向へ付勢された状態で前記保護部材の基端部外周に配置されてなる（１）〜（４）のいずれかに記載の留置針組立体、
（６）前記プロテクタの閉鎖部材は、一部が切断された環状体である（５）記載の留置針組立体、
（７）前記プロテクタの閉鎖部材は、弾性材料から形成された環状体である（５）記載の留置針組立体、
（８）前記保護部材の先端部に設けられた係止手段は、前記閉鎖部材が付勢力によって収縮して嵌合しうる少なくとも一つの溝部である（５）〜（７）のいずれかに記載の留置針組立体、
（９）前記プロテクタの閉鎖部材は、前記保護部材の基端を挿通しうる内径を有する開口部を備え、自然状態で前記保護部材の基端部外周に配置されてなる環状体である（１）〜（４）のいずれかに記載の留置針組立体、
（１０）前記保護部材の先端部に設けられた係止手段は、基端側へ向けて外方へ突設された爪部と先端側へ向けて外方へ突設された爪部である（９）記載の留置針組立体、
（１１）前記内針の針先が前記保護部材の内部空間に収容される前の外針ハブの内周面と閉鎖部材との係合固定は、前記閉鎖部材が外針ハブの内周面に形成された環状凹部に嵌合することによりなされるものである（１）〜（１０）のいずれかに記載の留置針組立体、
（１２）前記内針の針先が前記保護部材の内部空間に収容される前の外針ハブの内周面と閉鎖部材との係合固定は、前記閉鎖部材が外針ハブの内周面で閉鎖部材よりも基端側に形成された環状突部に係合することによりなされるものである（１）〜（１０）のいずれかに記載の留置針組立体
に関する。 That is, the present invention
(1) An inner needle having a sharp needle tip at the tip and an engaging portion in the vicinity of the tip, an inner needle hub provided at the proximal end of the inner needle, and an outer needle disposed on the outer periphery of the inner needle An indwelling needle assembly comprising: an outer needle hub provided at a proximal end portion of the outer needle; and a protector for protecting the needle tip of the inner needle that is slidably disposed in the axial direction on the outer periphery of the inner needle. In
The protector is provided with an internal space that can accommodate the needle tip of the inner needle, and a protective member that can slide in the axial direction on the inner needle, and is slidably disposed on the outer periphery of the protective member from the proximal end to the distal end. A closure member,
The protection member is provided with a distal end side opening through which the inner needle can be inserted and a proximal end opening through which the inner needle body can be inserted but the engagement portion cannot pass. A displacement side wall is provided that can be displaced inward to close the opening on the front end side when accommodated in a space, and the displacement side wall is inward by disposing the closing member on the outer periphery of the front end of the protective member. Is displaced to
The closure member is disposed on the outer periphery of the base end portion where the displacement side wall of the protection member is not provided before the needle tip is accommodated in the internal space of the protection member, and the needle tip is accommodated in the internal space of the protection member. When the outer periphery of the protection member is slid to the tip side when it is done, it is arranged on the outer periphery of the tip portion provided with a displacement side wall of the protection member,
The protector is disposed in the outer needle hub before the needle tip of the inner needle is accommodated in the inner space of the protection member, and the inner peripheral surface of the outer needle hub and the closing member are engaged and fixed, In the engagement, the inner needle is withdrawn from the outer needle to the proximal end side, and the engaging portion of the inner needle engages with the proximal end opening of the protecting member, so that the protective member and the inner needle are in the proximal end. The locking member is maintained until the closing member slides and is arranged on the outer periphery of the distal end portion of the protective member, and the engagement is provided with the locking member provided at the distal end portion of the protective member. An indwelling needle assembly that is released by being locked by the outer needle hub and that can be detached from the outer needle hub;
(2) The protector of the protector includes a proximal wall having a proximal opening, a distal wall having a distal opening, and a side wall extending in the axial direction of a needle provided integrally with the proximal wall and the distal wall. The indwelling needle assembly according to (1), wherein the displacement side wall is provided on a part of the side wall,
(3) The indwelling needle assembly according to (2), wherein the protective member of the protector has a pair of opposing side walls, and one tip of the side wall is a displacement side wall.
(4) The protector of the protector has four side walls that surround the needle tip from four directions, and a pair of displacement side walls are provided at a pair of tip portions opposed to the side walls. Indwelling needle assembly,
(5) The closing member of the protector includes an opening having an inner diameter slightly smaller than an inner diameter necessary for inserting the proximal end of the protective member, and is biased inwardly in the state of the protective member. The indwelling needle assembly according to any one of (1) to (4), which is disposed on the outer periphery of the base end portion,
(6) The indwelling needle assembly according to (5), wherein the closing member of the protector is an annular body partly cut.
(7) The indwelling needle assembly according to (5), wherein the closing member of the protector is an annular body formed of an elastic material.
(8) The locking means provided at the distal end portion of the protection member is at least one groove portion in which the closing member can be contracted and fitted by an urging force, according to any one of (5) to (7). Indwelling needle assembly,
(9) The closing member of the protector is an annular body that includes an opening having an inner diameter through which the base end of the protection member can be inserted, and is disposed on the outer periphery of the base end portion of the protection member in a natural state (1 ) To (4), the indwelling needle assembly according to any one of
(10) The locking means provided at the distal end portion of the protection member are a claw portion projecting outward toward the proximal end side and a claw portion projecting outward toward the distal end side. (9) The indwelling needle assembly according to
(11) The engagement fixing between the inner peripheral surface of the outer needle hub and the closing member before the needle tip of the inner needle is accommodated in the inner space of the protection member is performed by the closing member being the inner peripheral surface of the outer needle hub. The indwelling needle assembly according to any one of (1) to (10), which is made by fitting into an annular recess formed in
(12) The engagement fixing between the inner peripheral surface of the outer needle hub and the closing member before the needle tip of the inner needle is accommodated in the inner space of the protective member is performed by the closing member being the inner peripheral surface of the outer needle hub. The present invention relates to the indwelling needle assembly according to any one of (1) to (10), wherein the indwelling needle assembly is engaged with an annular protrusion formed on the base end side of the closing member.

本発明の留置針組立体は、プロテクタを保護部材と閉鎖部材の二部材から構成することにより、従来のプロテクタのように内方向への付勢力が直接針の外周面にかからない。したがって、内針抜去時に内針上を摺動するプロテクタの摺動抵抗が低くなり、操作を片手で容易に行うことができる。また、使用前の内針上にプロテクタを配置する際も、プロテクタの内方向への付勢力が直接針の外周面にかからないため、付勢力に逆らいながらプロテクタの開口部に内針を挿通させる必要はなく、スムーズな配置が可能である。 In the indwelling needle assembly of the present invention, the protector is composed of two members, that is, a protective member and a closing member, so that the inward biasing force is not directly applied to the outer peripheral surface of the needle unlike the conventional protector. Therefore, the sliding resistance of the protector that slides on the inner needle when the inner needle is removed is lowered, and the operation can be easily performed with one hand. Also, when the protector is placed on the inner needle before use, the protector's inward biasing force is not directly applied to the outer peripheral surface of the needle, so it is necessary to insert the inner needle through the protector's opening while resisting the biasing force. There is no smooth arrangement.

以下、図面を用いて本発明の好ましい実施態様を詳細に説明するが、本発明はこれらに限定されるものではない。
図１は本発明の留置針組立体の一実施例の内針抜去前の状態を示す縦断面図であり、図２は図１に示される留置針組立体のプロテクタ部分の拡大縦断面図である。図３は本発明の留置針組立体におけるプロテクタの一実施例の針先収容前の状態を示す斜視図であり、図４は図３に示されるプロテクタの針先収容後の状態を示す斜視図である。図５〜７は本発明の留置針組立体におけるプロテクタの他の実施例を示す斜視図である。また、図８は図１に示される留置針組立体において、内針抜去時にプロテクタに内針の針先が収容される様子を示す説明図である。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings, but the present invention is not limited thereto.
FIG. 1 is a longitudinal sectional view showing a state before an inner needle is removed in an embodiment of the indwelling needle assembly of the present invention, and FIG. 2 is an enlarged longitudinal sectional view of a protector portion of the indwelling needle assembly shown in FIG. is there. 3 is a perspective view showing a state of the protector in the indwelling needle assembly according to an embodiment of the present invention before accommodation of the needle tip, and FIG. 4 is a perspective view showing a state of the protector shown in FIG. 3 after accommodation of the needle tip. It is. 5 to 7 are perspective views showing other embodiments of the protector in the indwelling needle assembly of the present invention. FIG. 8 is an explanatory view showing a state in which the tip of the inner needle is accommodated in the protector when the inner needle is removed in the indwelling needle assembly shown in FIG.

図１に示されるように、本発明の留置針組立体１は、先端に鋭利な針先２１を有する内針２と、内針２の基端部に設けられる内針ハブ３と、内針２の外周に配置される外針４と、外針４の基端部に設けられる外針ハブ５と、内針２の外周に配置されるプロテクタ６とを備えてなる。本発明の留置針組立体１において、先端側とは患者に穿刺される針先２１側（図中左側）を、基端側とはシリンジやチューブ等に接続される針基側（図中右側）を意味する。 As shown in FIG. 1, an indwelling needle assembly 1 of the present invention includes an inner needle 2 having a sharp needle tip 21 at a distal end, an inner needle hub 3 provided at a proximal end portion of the inner needle 2, and an inner needle. 2, an outer needle 4 disposed on the outer periphery of the outer needle 4, an outer needle hub 5 provided at the proximal end of the outer needle 4, and a protector 6 disposed on the outer periphery of the inner needle 2. In the indwelling needle assembly 1 of the present invention, the distal end side is the needle tip 21 side (left side in the figure) punctured by the patient, and the proximal end side is a needle proximal side (right side in the figure) connected to a syringe, a tube, or the like. ).

内針２は中空針であり、その材質としては、例えばステンレス鋼やアルミニウムまたはアルミニウム合金、チタンまたはチタン合金が挙げられるが、易加工性やコスト等からステンレス鋼を用いることが好ましい。また、内針２の先端には鋭利な針先２１が形成されているが、その形状は患者への穿刺抵抗を低減するものであれば特に限定されるものではない。 The inner needle 2 is a hollow needle, and examples of the material thereof include stainless steel, aluminum or aluminum alloy, titanium or titanium alloy, and it is preferable to use stainless steel in view of easy processability and cost. Further, a sharp needle tip 21 is formed at the tip of the inner needle 2, but the shape is not particularly limited as long as it reduces puncture resistance to the patient.

前記内針２の先端近傍には、図８に示されるように、係合部２２が形成される。係合部２２は、内針２の外周表面の一部が拡径された部分であり、後述するプロテクタ６の保護部材６１の基端側開口６１３を通過できない径を有するものである。この係合部２２は、内針２の外周表面を円周方向にわたって拡径された環状拡径部であってもよいし、円周方向の一部または複数部分に設けられた突部であってもよい。また、係合部２２を設ける位置は、後述するように係合部２２がプロテクタ６の保護部材６１の基端部開口６１３部分で基端壁６１４と係合した時に内針２の針先２１が保護部材６１の内部空間６１１に収容される位置である。このような係合部２２は、内針２のクリンプ加工等により形成される。 As shown in FIG. 8, an engaging portion 22 is formed near the tip of the inner needle 2. The engaging part 22 is a part in which a part of the outer peripheral surface of the inner needle 2 is enlarged in diameter, and has a diameter that cannot pass through the proximal end side opening 613 of the protective member 61 of the protector 6 described later. The engaging portion 22 may be an annular enlarged portion in which the outer peripheral surface of the inner needle 2 is expanded in the circumferential direction, or a protrusion provided in a part or a plurality of portions in the circumferential direction. May be. Further, the position where the engaging portion 22 is provided is that the needle tip 21 of the inner needle 2 is located when the engaging portion 22 is engaged with the proximal end wall 614 at the proximal end opening 613 portion of the protective member 61 of the protector 6 as described later. Is a position in which the internal space 611 of the protection member 61 is accommodated. Such an engaging portion 22 is formed by crimping the inner needle 2 or the like.

前記内針２の基端部に設けられる内針ハブ３は、略円筒状の中空部材であり、内針２の基端部に嵌合、カシメ、融着または接着剤による接着、あるいはこれらの組み合わせ等によって固定される。内針ハブ３は熱可塑性樹脂等を材料とし、射出成形等により形成される。内針ハブ３は、内針２を患者に穿刺した際に血液のフラッシュバックを確認できるよう、透明、着色透明または半透明の樹脂で視認可能であるように形成されることが好ましい。 The inner needle hub 3 provided at the proximal end portion of the inner needle 2 is a substantially cylindrical hollow member, and is fitted to the proximal end portion of the inner needle 2, caulked, fused or bonded by an adhesive, or these Fixed by a combination or the like. The inner needle hub 3 is made of a thermoplastic resin or the like and is formed by injection molding or the like. The inner needle hub 3 is preferably formed so as to be visible with a transparent, colored transparent or translucent resin so that blood flashback can be confirmed when the patient is punctured with the inner needle 2.

前記内針ハブ３の基端側には通気フィルタ７１を備えた内針キャップ７が接続されていることが好ましい。通気フィルタ７１は、気体は透過するが液体は透過しない性質を持つものであり、例えばポリエチレンなどの高分子材料と親水性、水溶性または水膨潤性ポリマーを含む材料とを焼結した焼結多孔体や、疎水性不織布、多孔質体などがあげられる。このような通気フィルタ７１を用いることにより、内針２を患者に穿刺した際の血液のフラッシュバックを促し、またフラッシュバックにより内針２内部に流入した血液が外部に漏れることを防止でき、さらに通気フィルタ７１が血液と接触することによって通気が遮断されるために、外部からの空気の進入を防ぐこともできる。このような通気フィルタ７１は、直接内針ハブ３の基端部内部に設けられていてもよい。 It is preferable that an inner needle cap 7 having a ventilation filter 71 is connected to the proximal end side of the inner needle hub 3. The ventilation filter 71 has a property of allowing gas to permeate but not liquid, for example, a sintered porous material obtained by sintering a polymer material such as polyethylene and a material containing a hydrophilic, water-soluble or water-swellable polymer. Body, hydrophobic nonwoven fabric, and porous body. By using such a ventilation filter 71, it is possible to promote a flashback of blood when the patient is punctured with the inner needle 2, and it is possible to prevent blood flowing into the inner needle 2 due to the flashback from leaking to the outside. Since ventilation is blocked by the ventilation filter 71 coming into contact with blood, it is possible to prevent air from entering from the outside. Such a ventilation filter 71 may be provided directly inside the proximal end portion of the inner needle hub 3.

外針４は中空状をなし、患者の血管に留置される際に血管壁等を損傷するおそれがない程度に可撓性を有する材料で形成される。外針４の材質としては、例えばエチレン−テトラフルオロエチレン共重合体、ポリウレタン、ポリエーテルナイロン樹脂、ポリプロピレンなどの各種軟質樹脂が好ましい。また、外針４は全体または一部が内部の視認性を有していてもよいし、材料中に硫酸バリウムや炭酸バリウム等のＸ線造影剤を配合することによって、造影機能を有していてもよい。
前記外針４の先端は、内針２と共に患者の血管に穿刺される際の抵抗を低減するために、外径が先端に向かって漸減するテーパー状に形成されていることが好ましい。また、外針４の先端部付近には、内部を流れる流体の出入りを効率よく行うために、一個または複数個の穴が設けられていてもよい。 The outer needle 4 has a hollow shape and is formed of a material having flexibility to the extent that there is no possibility of damaging the blood vessel wall or the like when placed in a patient's blood vessel. As a material of the outer needle 4, for example, various soft resins such as ethylene-tetrafluoroethylene copolymer, polyurethane, polyether nylon resin, and polypropylene are preferable. Further, the outer needle 4 may be entirely or partially visible inside, and has a contrast function by blending an X-ray contrast agent such as barium sulfate or barium carbonate in the material. May be.
In order to reduce resistance when the patient's blood vessel is punctured with the inner needle 2 together with the inner needle 2, the outer needle 4 is preferably formed in a tapered shape whose outer diameter gradually decreases toward the distal end. In addition, one or a plurality of holes may be provided in the vicinity of the distal end portion of the outer needle 4 in order to efficiently enter and exit the fluid flowing inside.

前記外針４の基端部に設けられる外針ハブ５もまた、内針ハブ５と同様に略円筒状の中空部材であり、外針４の基端部に嵌合、カシメ、融着または接着剤による接着、あるいはこれらの組み合わせ等によって固定される。外針ハブ５の材質および成形方法は内針ハブ５と同様のものが用いられる。外針ハブ５の外周面には、内針２および外針４を患者の血管に穿刺する操作を容易にするための操作突部５１が形成されていてもよい。また、外針ハブ５の基端部には、後述する内針ハブ３の配置やチューブやコネクター等の医療用具を接続するために、メスルアーテーパー５２やフランジ５３が形成されていてもよい。 The outer needle hub 5 provided at the proximal end portion of the outer needle 4 is also a substantially cylindrical hollow member, like the inner needle hub 5, and is fitted, caulked, fused or bonded to the proximal end portion of the outer needle 4. It is fixed by bonding with an adhesive or a combination thereof. The material and molding method of the outer needle hub 5 are the same as those of the inner needle hub 5. An operation protrusion 51 may be formed on the outer peripheral surface of the outer needle hub 5 for facilitating the operation of piercing the patient's blood vessel with the inner needle 2 and the outer needle 4. Further, a female luer taper 52 and a flange 53 may be formed at the proximal end portion of the outer needle hub 5 in order to connect a medical device such as an arrangement of the inner needle hub 3 and a tube or a connector which will be described later.

前記内針２の外周には、内針２の針先２１を保護するためのプロテクタ６が配置される。図２に示されるように、本発明のプロテクタ６は保護部材６１と閉鎖部材６２とを有してなる。保護部材６１は、内針２の針先２１を収容しうる内部空間６１１を備え、先端側開口６１２および基端側開口６１３に内針２を挿通した状態で、内針２の外周を内針２の軸方向に摺動することができるものである。前記閉鎖部材６２は前記保護部材６１の外周に配置され、保護部材６１の基端部から先端部まで摺動することができるものである。 A protector 6 for protecting the needle tip 21 of the inner needle 2 is disposed on the outer periphery of the inner needle 2. As shown in FIG. 2, the protector 6 of the present invention includes a protection member 61 and a closing member 62. The protection member 61 includes an internal space 611 that can accommodate the needle tip 21 of the inner needle 2, and the outer periphery of the inner needle 2 is connected to the inner needle 2 with the inner needle 2 inserted through the distal end side opening 612 and the proximal end side opening 613. 2 can slide in the axial direction. The closing member 62 is disposed on the outer periphery of the protection member 61 and can slide from the proximal end portion to the distal end portion of the protection member 61.

前記保護部材６１は、基端側開口６１３を有する基端壁６１４と、先端側開口６１２を有する先端壁６１５と、基端壁６１４および先端壁６１５と一体的に設けられる内針２の軸方向に延びる側壁６１６とを有している。内針２の針先２１を収容しうる内部空間６１１は、この基端壁６１４、先端壁６１５および側壁６１６によって形成されるものであるが、この内部空間６１１は完全に外部から遮蔽された空間であってもよいし、図３〜７に示されるように部分的に開放されたものであってもよい。
すなわち、保護部材６１の形状は、先端側開口６１２および基端側開口６１３に内針２を挿通でき、なおかつ内部空間６１１に針先２１を収容できるものであれば、特に限定されるものではない。ただし、内部空間６１１に収容された針先２１が基端側開口６１３から基端側へ脱落することを防止するために、基端側開口６１３は、内針２の本体は挿通しうるが、内針２の係合部２２は通過できずに基端側開口６１３部分で基端壁６１４と係合しうる大きさを有している。前記先端部開口６１２は、先端壁６１５に設けられた孔である必要はなく、単に先端壁６１５の内側端部に内針２を位置付けるために設けられた溝であってもよい。 The protective member 61 includes a proximal end wall 614 having a proximal end side opening 613, a distal end wall 615 having a distal end side opening 612, and an axial direction of the inner needle 2 provided integrally with the proximal end wall 614 and the distal end wall 615. And a side wall 616 extending in the direction. The internal space 611 that can accommodate the needle tip 21 of the inner needle 2 is formed by the proximal end wall 614, the distal end wall 615, and the side wall 616. The internal space 611 is a space that is completely shielded from the outside. Or may be partially opened as shown in FIGS.
That is, the shape of the protective member 61 is not particularly limited as long as the inner needle 2 can be inserted into the distal end side opening 612 and the proximal end side opening 613 and the needle tip 21 can be accommodated in the internal space 611. . However, in order to prevent the needle tip 21 accommodated in the internal space 611 from dropping out from the proximal end side opening 613 to the proximal end side, the proximal end side opening 613 can be inserted through the main body of the inner needle 2. The engaging portion 22 of the inner needle 2 has a size that cannot be passed through and can engage with the proximal end wall 614 at the proximal end side opening 613 portion. The distal end opening 612 does not need to be a hole provided in the distal end wall 615 but may be a groove provided for positioning the inner needle 2 at the inner end of the distal end wall 615.

前記保護部材６１の具体例としては、図２〜７に示されるような形状を持つものがあげられる。ここに示される保護部材６１は、四角形板状の基端壁６１４と同じく四角形板状の先端壁６１５を有しており、基端壁６１４の対向する二辺から対向する一対の側壁６１６が立設されている。一方の側壁６１６は板状であり、一端が基端壁６１４と一体的に設けられ、他端が先端壁６１５と一体的に設けられることで、基端壁６１４と先端壁６１５が対向するように配置される。他方の側壁６１６もまた板状であり、一端が基端壁６１４と一体的に設けられるが、側壁６１６の先端部の一部に変位側壁６３が設けられている。 Specific examples of the protective member 61 include those having shapes as shown in FIGS. The protective member 61 shown here has a square plate-like distal end wall 615 as well as a square plate-like proximal end wall 614, and a pair of side walls 616 opposed from two opposite sides of the proximal end wall 614 are raised. It is installed. One side wall 616 has a plate shape, and one end is provided integrally with the base end wall 614 and the other end is provided integrally with the tip end wall 615 so that the base end wall 614 and the tip end wall 615 are opposed to each other. Placed in. The other side wall 616 is also plate-shaped, and one end thereof is provided integrally with the base end wall 614, but the displacement side wall 63 is provided at a part of the distal end portion of the side wall 616.

前記変位側壁６３とは、前記保護部材６１の先端部に設けられるものであり、内針２の針先２１が保護部材６１の内部空間６１１に収容されたときに、前記先端壁６１５に設けられた先端側開口６１２を閉鎖するよう内方向へ変位するものである。変位側壁６３は、例えば図３に示されるように、外方へ沿った状態で側壁６１６に連設される本体部６３１と、本体部６３１の先端側に連設される閉鎖部６３２とから構成される。前記本体部６３１は外力により内方向に変位する、すなわち撓むことが可能であり、本体部６３１が内方向へ撓むと前記閉鎖部６３２が先端壁６１５の先端側開口６１２を閉鎖する。ここで、前記先端側開口６１２の閉鎖とは、必ずしも先端側開口６１２が密閉されることを指すものではなく、保護部材６１先端側から内部空間６１１に収容された内針２の針先２１が再度突出しないようにすることを指している。 The displacement side wall 63 is provided at the distal end portion of the protection member 61, and is provided on the distal end wall 615 when the needle tip 21 of the inner needle 2 is accommodated in the internal space 611 of the protection member 61. The front end side opening 612 is displaced inward so as to be closed. For example, as shown in FIG. 3, the displacement side wall 63 is composed of a main body portion 631 provided continuously to the side wall 616 in a state along the outer side, and a closing portion 632 provided continuously to the distal end side of the main body portion 631. Is done. The main body portion 631 can be displaced inward by an external force, that is, can be bent. When the main body portion 631 is bent inward, the closing portion 632 closes the front end opening 612 of the front end wall 615. Here, the closing of the distal end side opening 612 does not necessarily mean that the distal end side opening 612 is sealed, but the needle tip 21 of the inner needle 2 accommodated in the internal space 611 from the distal end side of the protective member 61 is not limited. It means not to protrude again.

前記側壁６１６は、図示される対向する一対の側壁以外に、針先２１を四方から包囲する４枚の板状側壁からなり、略四角柱状の保護部材６１を提供するものであってもよい。また、前記変位側壁６３は、図示される具体例のように、側壁６１６の一方の先端部全体に設けられるものであってもよいし、図示されないが側壁６１６の一方の先端部の一部分に設けられてもよい。あるいは、複数の側壁６１６に複数の変位側壁６３が設けられてもよい。 The side wall 616 may be composed of four plate-like side walls surrounding the needle tip 21 from four sides in addition to the pair of opposed side walls shown in the figure, and may provide a substantially quadrangular prism-shaped protection member 61. Further, the displacement side wall 63 may be provided on the entire one end portion of the side wall 616 as shown in the illustrated example, or may be provided on a part of one end portion of the side wall 616 although not shown. May be. Alternatively, a plurality of displacement side walls 63 may be provided on the plurality of side walls 616.

前記変位側壁６３の内方向への変位は、閉鎖部材６２によってなされる。すなわち、保護部材６１の外周に摺動可能に配置される閉鎖部材６２が保護部材６１の先端部外周に配置されることにより、変位側壁６３は内方向に変位せしめられ、先端側開口６１２から内針２の針先２１が突出しないように閉鎖するものである。前記閉鎖部材６２は通常、針先２１が内部空間６１１に収容される前は図３に示されるように保護部材６１の基端部の外周に配置され、針先２１が前記内部空間６１１に収容された時に前記保護部材６１の外周を先端側へと摺動し、図４に示されるように変位側壁６３が備えられた先端部の外周に配置される。ここで保護部材６１の基端部とは、変位側壁６３が備えられる先端部よりも基端側の部分を指している。 The displacement side wall 63 is displaced inward by the closing member 62. That is, when the closing member 62 slidably disposed on the outer periphery of the protective member 61 is disposed on the outer periphery of the distal end portion of the protective member 61, the displacement side wall 63 is displaced inward, and the inner side of the distal end side opening 612 The needle 2 of the needle 2 is closed so as not to protrude. The closing member 62 is normally disposed on the outer periphery of the proximal end portion of the protective member 61 as shown in FIG. 3 before the needle tip 21 is accommodated in the internal space 611, and the needle tip 21 is accommodated in the internal space 611. When this is done, the outer periphery of the protective member 61 slides toward the distal end side and is disposed on the outer periphery of the distal end portion provided with the displacement side wall 63 as shown in FIG. Here, the proximal end portion of the protection member 61 refers to a portion closer to the proximal end than the distal end portion where the displacement side wall 63 is provided.

本発明の保護部材６１の他の形状としては、内針２を完全に収容しうるように側壁６１６が筒状のものや、２枚以上の側壁により構成されるほぼ筒状のものなどであってもよい。また保護部材６１の側壁６１６部分における軸に垂直な断面の外周は、図示される四角形状や円形状以外に多角形状等であってもよい。保護部材６１の側壁６１６部分における軸に垂直な断面の外周形状と、閉鎖部材６２の内周形状とは、必ずしも同一である必要はないが、閉鎖部材６２は保護部材６１の外周上を低い摺動抵抗で摺動しうるような内径および形状を有している必要がある。
また前記保護部材６１の変位側壁６３の閉鎖部６３２は、変位側壁６３の先端部より基端側に向けて突出するよう設けられることにより、針先２１の保護部材６１の先端側からの突出をより効果的に防止することができる。 Other shapes of the protective member 61 of the present invention include a cylindrical side wall 616 so that the inner needle 2 can be completely accommodated, and a substantially cylindrical shape constituted by two or more side walls. May be. Further, the outer periphery of the cross section perpendicular to the axis in the side wall 616 portion of the protective member 61 may be a polygonal shape or the like in addition to the illustrated rectangular shape or circular shape. The outer peripheral shape of the cross section perpendicular to the axis in the side wall 616 portion of the protective member 61 and the inner peripheral shape of the closing member 62 are not necessarily the same, but the closing member 62 is low on the outer periphery of the protective member 61. It must have an inner diameter and shape that can slide with dynamic resistance.
Further, the closing portion 632 of the displacement side wall 63 of the protection member 61 is provided so as to protrude toward the proximal end side from the distal end portion of the displacement side wall 63, thereby preventing the needle tip 21 from protruding from the distal end side of the protection member 61. It can prevent more effectively.

前記保護部材６１は、全体が同一材料から形成される場合は、加工により内方向へ変位する変位側壁６３が形成可能な材料、例えばステンレス鋼、アルミニウムまたはアルミニウム合金、チタンまたはチタン合金、銅または銅系合金等の各種金属材料、またはポリエチレン、ポリプロピレン、ポリブタジエン、エチレン−酢酸ビニル共重合体等のポリオレフィン、ポリ塩化ビニル、ポリウレタン、ポリスチレン、ポリメチルメタクリレート、ポリカーボネート、ポリアミド、ポリエチレンテレフタレート、ポリブチレンテレフタレート等のポリエステル、アクリル系樹脂、ABS樹脂、アイオノマー、ポリアセタール、ポリフェニレンサルファイド、ポリエーテルエーテルケトン等の各種樹脂材料等から形成されることが好ましい。 When the protective member 61 is entirely formed of the same material, a material capable of forming a displacement side wall 63 that is displaced inward by processing, for example, stainless steel, aluminum or an aluminum alloy, titanium or a titanium alloy, copper or copper Various metal materials such as alloys, polyolefins such as polyethylene, polypropylene, polybutadiene, ethylene-vinyl acetate copolymer, polyvinyl chloride, polyurethane, polystyrene, polymethyl methacrylate, polycarbonate, polyamide, polyethylene terephthalate, polybutylene terephthalate, etc. It is preferably formed from various resin materials such as polyester, acrylic resin, ABS resin, ionomer, polyacetal, polyphenylene sulfide, and polyether ether ketone.

このような材料から形成される保護部材６１は、射出成形等により成形された樹脂材料、曲げ加工等により成形された金属材料を接合することにより形成することができる。この場合の接合方法は特に限定されず、例えば、カシメ、凹凸による係合、接着剤による接着、融溶などが挙げられる。また、前記保護部材６１は、前記材料の２種以上を組み合わせて形成することも可能である。例えば、変位側壁６３の内壁にセラミックスのような硬質材料で形成した部材を取り付けることにより、変位側壁６３の強度の向上を図り、変位による破壊を防止することができる。ここで、保護部材６１の基端部は、外周に配置される閉鎖部材６２が後述するように内方向へ付勢された状態で配置される場合においては、その付勢力を直接内針２上に付加することがないよう、変形しない強度を有していなければならない。 The protective member 61 formed from such a material can be formed by joining a resin material molded by injection molding or the like, or a metal material molded by bending or the like. The joining method in this case is not particularly limited, and examples thereof include caulking, engagement by unevenness, adhesion using an adhesive, and melting. Further, the protective member 61 can be formed by combining two or more of the materials. For example, by attaching a member made of a hard material such as ceramics to the inner wall of the displacement side wall 63, the strength of the displacement side wall 63 can be improved, and breakage due to displacement can be prevented. Here, when the base member of the protective member 61 is disposed in a state in which the closing member 62 disposed on the outer periphery is urged inward as will be described later, the urging force is directly applied to the inner needle 2. It must have strength that does not cause deformation.

前記保護部材６１の外周に配置される閉鎖部材６２は、前述のように保護部材６１の外周上を摺動しうるような内径および内周形状を有している。前記閉鎖部材６２はポリエチレン、ポリプロピレン、ポリブタジエン、エチレン−酢酸ビニル共重合体等のポリオレフィン、ポリ塩化ビニル、ポリウレタン、ポリスチレン、ポリメチルメタクリレート、ポリカーボネート、ポリアミド、ポリエチレンテレフタレート、ポリブチレンテレフタレート等のポリエステル、アクリル系樹脂、ABS樹脂、アイオノマー、ポリアセタール、ポリフェニレンサルファイド、ポリエーテルエーテルケトン等の各種樹脂材料、またはステンレス鋼、アルミニウムまたはアルミニウム合金、チタンまたはチタン合金、銅または銅系合金等の各種金属材料、セラミック等の硬質材料などから形成される。また前記閉鎖部材６２は天然ゴム、イソプレンゴム、ブタジエンゴム等のゴム材料や、熱可塑性エラストマー等、弾性材料から形成されるものであってもよい。前記閉鎖部材６２は射出成形等によって、環状体あるいは一部が切断された環状体等に形成される。 The closing member 62 disposed on the outer periphery of the protective member 61 has an inner diameter and an inner peripheral shape that can slide on the outer periphery of the protective member 61 as described above. The closing member 62 is a polyolefin such as polyethylene, polypropylene, polybutadiene, or ethylene-vinyl acetate copolymer, polyvinyl chloride, polyurethane, polystyrene, polymethyl methacrylate, polycarbonate, polyamide, polyethylene terephthalate, polyester such as polybutylene terephthalate, or acrylic. Various resin materials such as resin, ABS resin, ionomer, polyacetal, polyphenylene sulfide, polyether ether ketone, or various metal materials such as stainless steel, aluminum or aluminum alloy, titanium or titanium alloy, copper or copper alloy, ceramic, etc. It is formed from a hard material. The closing member 62 may be made of a rubber material such as natural rubber, isoprene rubber or butadiene rubber, or an elastic material such as a thermoplastic elastomer. The closing member 62 is formed into an annular body or an annular body partly cut by injection molding or the like.

閉鎖部材６２の一実施例としては、図３および図４に示されるように一部が切断された環状体があげられる。この閉鎖部材６２は、保護部材６１の基端部を挿通するために必要な内径よりもわずかに小さい内径を有する開口部を備えており、切断部６２１が押し広げられた状態で前記保護部材６１の基端部外周に配置される。このような閉鎖部材６２は切断部６２１が閉じる方向、すなわち内方向に付勢力を発生するような剛性を有する材料で形成される。したがって、前記閉鎖部材６２は、図３に示されるように切断部６２１が押し広げられ、内方向へ付勢された状態で保護部材２の基端部外周に配置され、図４に示されるように先端側へ摺動して保護部材６１の先端部外周に配置されるときは、その付勢力によって変位側壁６３を内方向へ変位させる。 An example of the closing member 62 is an annular body that is partially cut as shown in FIGS. 3 and 4. The closing member 62 includes an opening having an inner diameter that is slightly smaller than an inner diameter necessary for inserting the proximal end portion of the protective member 61, and the protective member 61 is in a state where the cutting portion 621 is expanded. It is arrange | positioned at the base end part outer periphery. Such a closing member 62 is formed of a material having such rigidity that generates a biasing force in a direction in which the cutting portion 621 is closed, that is, inward. Accordingly, the closing member 62 is disposed on the outer periphery of the proximal end portion of the protection member 2 in a state where the cutting portion 621 is pushed and spread inward as shown in FIG. 3, as shown in FIG. When the sliding member 63 is slid to the distal end side and disposed on the outer periphery of the distal end portion of the protection member 61, the displacement side wall 63 is displaced inward by the biasing force.

前記閉鎖部材６２は保護部材６１の先端側へ摺動した際に、保護部材６１外周に設けられた係止手段によりそれ以降の摺動を阻止され、変位側壁６３を内方向へ変位させた状態で保護部材６１上に保持されることが好ましい。前記係止手段としては、例えば図示されるように変位側壁６３に設けられた、閉鎖部材６２が内方向へ収縮することにより嵌合して係止される溝部６３３があげられる。前記溝部６３３は保護部材６１の先端部外周に少なくとも一つ設けられるが、図示されるように複数個の溝部６３３が設けられることにより、閉鎖部材６２はより大きく内方向へ収縮し、確実に保護部材２に摺動不能に係止される。このような係止手段を設けることにより、保護部材６１の内部空間６１１に収容された針先２１が再度保護部材６１の先端側から突出することを防止するよう、先端側開口６１２が閉鎖部６２によって閉鎖された状態を保持することができる。 When the closing member 62 is slid to the front end side of the protective member 61, the sliding member 63 is prevented from sliding by the locking means provided on the outer periphery of the protective member 61, and the displacement side wall 63 is displaced inward. And is preferably held on the protective member 61. As the locking means, for example, a groove 633 provided on the displacement side wall 63 as shown in the figure and fitted and locked when the closing member 62 contracts inward can be used. At least one groove portion 633 is provided on the outer periphery of the front end portion of the protection member 61. However, by providing a plurality of groove portions 633 as shown in the drawing, the closing member 62 is contracted more inwardly and reliably protected. The member 2 is locked so as not to slide. By providing such a locking means, the distal end side opening 612 is prevented from projecting again from the distal end side of the protective member 61 so that the needle tip 21 accommodated in the internal space 611 of the protective member 61 protrudes from the distal end side of the protective member 61. The closed state can be maintained.

前記保護部材６１には、さらに先端側開口６１２が閉鎖部６３２によって閉鎖された状態を保持するためのロック機構が設けられていてもよい。前記ロック機構の例としては、例えば図５に示されるように、保護部材６１の変位側壁６３に設けられた溝部６３４と、先端壁６１５に設けられた突部６１７との係合によるものがあげられる。このようなロック機構を設けることにより、変位側壁６３を内方向へ変位させた状態でより確実に保持することが可能になり、保護部材６１の内部空間６１１に収容された針先２１が再度突出する危険をより効果的に防止することができる。 The protective member 61 may be further provided with a lock mechanism for holding the distal end side opening 612 closed by the closing portion 632. As an example of the locking mechanism, for example, as shown in FIG. 5, there is a mechanism by engagement between a groove 634 provided on the displacement side wall 63 of the protection member 61 and a protrusion 617 provided on the tip wall 615. It is done. By providing such a locking mechanism, the displacement side wall 63 can be more reliably held in a state of being displaced inward, and the needle tip 21 accommodated in the internal space 611 of the protection member 61 protrudes again. Can be more effectively prevented.

前記閉鎖部材６４は、弾性材料から形成された環状体であってもよい。前記閉鎖部材６４は、一部が切断された環状体である閉鎖部材６２と同様、保護部材６１の基端部を挿通するために必要な内径よりもわずかに小さい内径を有する開口部を備え、内周が押し広げられて内方向へ付勢された状態で前記保護部材６１の基端部外周に配置される。したがって、弾性材料から形成された環状体である閉鎖部材６４は先端側へ摺動して保護部材６１の先端部外周に配置されるときは、内方向への付勢力によって変位側壁６３を内方向へ変位させるものである。このような閉鎖部材６４は、一部が切断された環状体である閉鎖部材６２と同様、内方向へ収縮することにより保護部材６１先端部外周に設けられた溝部６３３に嵌合し、それ以降の摺動が阻止されることが好ましい。 The closing member 64 may be an annular body formed of an elastic material. The closing member 64 includes an opening having an inner diameter slightly smaller than an inner diameter required to pass through the proximal end portion of the protection member 61, similar to the closing member 62 which is an annular body partly cut. The inner circumference is pushed and spread inward and is arranged on the outer circumference of the base end portion of the protective member 61. Therefore, when the closing member 64, which is an annular body made of an elastic material, slides toward the distal end side and is disposed on the outer periphery of the distal end portion of the protective member 61, the displacement side wall 63 is moved inward by the inward biasing force. Is to be displaced. Such a closing member 64 is fitted in a groove portion 633 provided on the outer periphery of the front end portion of the protective member 61 by contracting inward, similarly to the closing member 62 which is an annular body partly cut, and thereafter It is preferable that the sliding is prevented.

図６は本発明の留置針組立体におけるプロテクタの他の実施例の針先収容前の状態を示す斜視図であり、図７は図６に示されるプロテクタの針先収容後の状態を示す斜視図である。
本発明の閉鎖部材は、図６および図７に示されるような環状体である閉鎖部材６４であってもよい。前記閉鎖部材６４は、保護部材６１の基端部を挿通しうる内径を有する開口部を備え、内方向へ付勢されない自然状態で保護部材６１の基端部に配置されるものである。図示される閉鎖部材６４は、外周が円形であり、内周が保護部材６１の側壁６１６部分の軸に垂直な断面の外周形状に合わせて四角形状に形成された環状体である。しかし、形状はこれらに限定されることなく、保護部材６１の外周上を軸方向に摺動しうるものであればよく、例えば内周が円形状であってもよい。前記閉鎖部材６４の厚みもまた特に限定されないが、保護部材６１の外周上を軸方向に摺動しうる剛性を備えている必要がある。 FIG. 6 is a perspective view showing a state of another embodiment of the protector in the indwelling needle assembly of the present invention before accommodation of the needle tip, and FIG. 7 is a perspective view showing a state of the protector shown in FIG. 6 after accommodation of the needle tip. FIG.
The closing member of the present invention may be a closing member 64 that is an annular body as shown in FIGS. The closing member 64 includes an opening having an inner diameter through which the proximal end portion of the protection member 61 can be inserted, and is disposed at the proximal end portion of the protection member 61 in a natural state without being biased inward. The closing member 64 shown in the figure is an annular body having a circular outer periphery and a quadrilateral shape whose inner periphery is matched to the outer peripheral shape of the cross section perpendicular to the axis of the side wall 616 portion of the protection member 61. However, the shape is not limited thereto, and any shape may be used as long as it can slide in the axial direction on the outer periphery of the protective member 61. For example, the inner periphery may be circular. The thickness of the closing member 64 is not particularly limited, but it is necessary to have rigidity capable of sliding in the axial direction on the outer periphery of the protection member 61.

前記閉鎖部材６４を変位側壁６３を内方向へ変位させた状態で保護部材６１上に保持するための係止手段としては、例えば図示されるように基端側へ向けて外方へ突設された爪部６３５と、爪部６３５の基端側に先端側へ向けて外方へ突設された爪部６３６とからなるものが用いられる。保護部材６１の外周上を基端部から先端部へと摺動した閉鎖部材６４は、前記爪部６３６を内方向へ付勢しながら乗り越え、前記爪部６３５の突端に当接して摺動を停止し、前記爪部６３５と閉鎖部材６４からの付勢力から開放されて元の位置に戻った爪部６３６との間に係止される。 As a locking means for holding the closing member 64 on the protection member 61 with the displacement side wall 63 displaced inward, for example, as shown in the figure, it protrudes outward toward the base end side. What consists of the nail | claw part 635 and the nail | claw part 636 which protruded outward toward the front end side at the base end side of the nail | claw part 635 is used. The closing member 64 slid on the outer periphery of the protective member 61 from the base end portion to the tip end portion moves over the claw portion 636 while urging the claw portion 636 inward, and comes into contact with the protruding end of the claw portion 635 to slide. It stops and is latched between the claw portion 635 and the claw portion 636 released from the urging force from the closing member 64 and returned to the original position.

前記閉鎖部材６４に設けられる係止手段は、閉鎖部材６４を変位側壁６３が内方向へ変位された状態で保持するものであるため、基本的には変位側壁６３上に設けられるものであるが、係止手段が前記爪部６３５および６３６から構成される場合、基端側の爪部６３６は側壁６１６の先端側に設けられてもよい。また前記係止手段は、変位側壁６３が設けられていない側壁６１６の、変位側壁６３に対向する先端部に設けられてもよい。 The locking means provided on the closing member 64 is basically provided on the displacement side wall 63 because it holds the closing member 64 in a state where the displacement side wall 63 is displaced inward. In the case where the locking means is composed of the claw portions 635 and 636, the claw portion 636 on the proximal end side may be provided on the distal end side of the side wall 616. Further, the locking means may be provided at a tip portion of the side wall 616 that is not provided with the displacement side wall 63 and that faces the displacement side wall 63.

内針２の針先２１が内部空間６１１に収容される前に、前記閉鎖部材６２および６４が保護部材６１の基端部外周に配置された状態を維持するために、前記保護部材６１の基端部には閉鎖部材６２および６４を係止する第二の係止手段を設けてもよい。このような第二の係止手段としては、前記爪部６３５および６３６のように一対の爪部からなるものがあげられる。一部が切断された環状体の閉鎖部材６２を用いる場合には、切断部６２１を押し広げることにより切断部６２１内に狭持させる凸部を設けてもよい。また、弾性材料から形成された環状体の閉鎖部材６２を用いる場合には、内周面を押し広げる凸部を設けることにより、閉鎖部材６２の内方向への付勢力により保護部材６１上に係止してもよい。 Before the needle tip 21 of the inner needle 2 is accommodated in the internal space 611, the base of the protective member 61 is used in order to maintain the state in which the closing members 62 and 64 are arranged on the outer periphery of the proximal end portion of the protective member 61. A second locking means for locking the closing members 62 and 64 may be provided at the end. Examples of such second locking means include a pair of claw portions such as the claw portions 635 and 636. In the case of using a ring-shaped closing member 62 that is partially cut, a convex portion that is held in the cut portion 621 by expanding the cut portion 621 may be provided. Further, when the annular closing member 62 made of an elastic material is used, a convex portion that pushes the inner peripheral surface is provided, whereby the closing member 62 is engaged on the protective member 61 by the inward biasing force. You may stop.

第二の係止手段は、前述の保護部材６１の先端部に設けられた係止手段とは異なり、容易に係止状態が解除できるものでなければならない。したがって、第二の係止手段が一対の爪部である場合は、先端側の爪部の高さが機能を発揮できる最小限まで低く設定されたり、凸部が設けられる場合は、先端側がテーパー形状に設定されるなどの考慮が必要になる。このような第二の係止手段を設けることにより、プロテクタ６が内針２上に配置された状態での針先２１の患者への穿刺操作が不都合なく行える。 Unlike the locking means provided at the tip of the protective member 61 described above, the second locking means must be capable of easily releasing the locked state. Therefore, when the second locking means is a pair of claw portions, the height of the claw portion on the front end side is set to a minimum that can function, or when a convex portion is provided, the front end side is tapered. It is necessary to consider setting the shape. By providing such a second locking means, the patient can puncture the patient with the needle tip 21 in a state where the protector 6 is disposed on the inner needle 2.

本発明の留置針組立体１は、図１に示されるような穿刺前の状態においては、外針４が内針２の外周に内針２の針先２１が先端側から突出するように配置され、内針ハブ２の先端部は外針ハブ４の基端部に挿入される。内針ハブ３の外周には環状のフランジ３１が設けられ、内針ハブ２の外針ハブ４への挿入は、内針２の針先２１が外針４の先端側から突出する位置で前記フランジ３１が外針ハブ５のフランジ５３に当接することにより停止される。 The indwelling needle assembly 1 of the present invention is arranged so that the outer needle 4 protrudes from the outer periphery of the inner needle 2 and the needle tip 21 of the inner needle 2 protrudes from the distal end side in the state before puncturing as shown in FIG. The distal end portion of the inner needle hub 2 is inserted into the proximal end portion of the outer needle hub 4. An annular flange 31 is provided on the outer periphery of the inner needle hub 3, and the inner needle hub 2 is inserted into the outer needle hub 4 at a position where the needle tip 21 of the inner needle 2 protrudes from the distal end side of the outer needle 4. The flange 31 is stopped by contacting the flange 53 of the outer needle hub 5.

本発明のプロテクタ６は、図１に示される留置針組立体１の穿刺前の状態においては外針ハブ５内部に配置される。したがって、留置針組立体１の穿刺操作時に操作者が誤ってプロテクタ６を摺動操作するおそれがない。
また、プロテクタ６が、内針２の針先２１が内部空間６１１に収容されるまで外針ハブ５内部に係合固定されるよう、外針ハブ５の内周面にはプロテクタ６の閉鎖部材６２を係合する手段が設けられている。前記係合手段は、内方向へ付勢された状態で保護部材６１の基端部外周に配置される閉鎖部材６２、すなわち一部が切断された環状体あるいは弾性材料から形成された環状体の場合は、例えば図２に示されるような環状凹部５４であり、自然状態で保護部材６１の基端部外周に配置される閉鎖部材６４の場合は、例えば閉鎖部材６４よりも基端側に配置される環状凸部（図示せず）である。 The protector 6 of the present invention is disposed inside the outer needle hub 5 in the state before the puncture of the indwelling needle assembly 1 shown in FIG. Therefore, there is no possibility that the operator erroneously slides the protector 6 during the puncturing operation of the indwelling needle assembly 1.
In addition, the protector 6 is engaged and fixed inside the outer needle hub 5 until the needle tip 21 of the inner needle 2 is accommodated in the internal space 611, and the closing member of the protector 6 is provided on the inner peripheral surface of the outer needle hub 5. Means for engaging 62 are provided. The engaging means is a closing member 62 arranged on the outer periphery of the proximal end portion of the protective member 61 in a state of being urged inward, that is, an annular body that is partially cut or formed of an elastic material. In the case, for example, the annular recess 54 as shown in FIG. It is an annular convex part (not shown).

以下、閉鎖部材６２が一部が切断された環状体あるいは弾性材料から形成された環状体であるプロテクタ６を例に挙げて、図１、図２および図８を用いて本発明の留置針組立体１の使用方法を説明しながら、前記環状凹部５４を用いた外針ハブ５とプロテクタ６との係合固定方法について詳述する。
図１に示されるように、本発明の留置針組立体１では、内針２の基端部をプロテクタ６の先端側開口６１２、基端側開口６１３の順にプロテクタ６の先端側から挿通させた後、内針２の基端部と内針ハブ３とを接着剤等で固定することにより、プロテクタ６が内針２上で内針ハブ３に隣接して配置される。その後、プロテクタ６を備えた内針２および内針ハブ３を外針ハブ５の基端部から外針４内へと挿入し、内針ハブ３のフランジ３１が外針ハブ５のフランジ５３に当接すると、内針２の針先２１が外針４の先端側から突出した状態となり、留置針組立体１の組み立てが完了する。この状態で内針ハブ３と外針ハブ５とは、カプラ等のフリーロック機構により着脱可能に固定されてもよい。 Hereinafter, the indwelling needle assembly of the present invention will be described with reference to FIGS. 1, 2 and 8 by taking as an example the protector 6 in which the closing member 62 is an annular body partially cut or an annular body formed of an elastic material. A method for engaging and fixing the outer needle hub 5 and the protector 6 using the annular recess 54 will be described in detail while explaining how to use the three-dimensional object 1.
As shown in FIG. 1, in the indwelling needle assembly 1 of the present invention, the proximal end portion of the inner needle 2 is inserted from the distal end side of the protector 6 in the order of the distal end side opening 612 and the proximal end side opening 613 of the protector 6. Thereafter, the protector 6 is disposed on the inner needle 2 adjacent to the inner needle hub 3 by fixing the proximal end portion of the inner needle 2 and the inner needle hub 3 with an adhesive or the like. Thereafter, the inner needle 2 and the inner needle hub 3 provided with the protector 6 are inserted into the outer needle 4 from the proximal end portion of the outer needle hub 5, and the flange 31 of the inner needle hub 3 is connected to the flange 53 of the outer needle hub 5. Upon contact, the needle tip 21 of the inner needle 2 is in a state of protruding from the distal end side of the outer needle 4 and the assembly of the indwelling needle assembly 1 is completed. In this state, the inner needle hub 3 and the outer needle hub 5 may be detachably fixed by a free lock mechanism such as a coupler.

この留置針組立体１の組み立て操作の間、プロテクタ６の閉鎖部材６２は保護部材６１の基端部外周に配置されており、変位側壁６３は先端側開口６１２を閉鎖していない。したがって、変位側壁６３の内方向への付勢力が直接内針２の外周面にかからないため、本発明のプロテクタ６の内針２上への配置は容易に行うことができる。また、保護部材６１の基端部は閉鎖部材６２が内方向へ付勢された状態で配置されたとしても、その付勢力を内針２へ伝えることのない剛性を備えているため、プロテクタ６の内針２上への配置を困難にすることはない。 During the assembling operation of the indwelling needle assembly 1, the closing member 62 of the protector 6 is disposed on the outer periphery of the proximal end portion of the protection member 61, and the displacement side wall 63 does not close the distal end side opening 612. Therefore, since the inward biasing force of the displacement side wall 63 is not directly applied to the outer peripheral surface of the inner needle 2, the protector 6 of the present invention can be easily arranged on the inner needle 2. Further, even if the base end portion of the protection member 61 is arranged in a state where the closing member 62 is urged inward, the protector 61 has rigidity that does not transmit the urging force to the inner needle 2. It is not difficult to place the needle on the inner needle 2.

留置針組立体１を患者の血管に穿刺した後、内針２は外針４から抜去され、外針４だけが患者の血管に留置される。この内針２の抜去操作と同時に、針先２１がプロテクタ６で保護されるよう、本発明の留置針組立体１には外針ハブ５の内周面に閉鎖部材６２を係合する手段としての環状凹部５４が設けられている。
前記内針２の抜去操作時には、外針４と外針ハブ５を患者に対して固定した状態で、内針ハブ３を基端側へと引っ張ることにより、内針２が外針４内を基端側へと移動する。このとき、プロテクタ６は、閉鎖部材６２が外針ハブ５内周面に設けられた環状凹部５４に嵌合固定されており、閉鎖部材６２と保護部材６１とは摩擦係合しているため、内針２と共に基端側へ移動するおそれはない。 After the indwelling needle assembly 1 is punctured into the patient's blood vessel, the inner needle 2 is removed from the outer needle 4, and only the outer needle 4 is placed in the patient's blood vessel. Simultaneously with the removal operation of the inner needle 2, the indwelling needle assembly 1 of the present invention is a means for engaging the closing member 62 with the inner peripheral surface of the outer needle hub 5 so that the needle tip 21 is protected by the protector 6. An annular recess 54 is provided.
During the extraction operation of the inner needle 2, the inner needle 2 is moved through the outer needle 4 by pulling the inner needle hub 3 toward the proximal end while the outer needle 4 and the outer needle hub 5 are fixed to the patient. Move to the proximal side. At this time, the protector 6 has the closing member 62 fitted and fixed to the annular recess 54 provided on the inner peripheral surface of the outer needle hub 5, and the closing member 62 and the protection member 61 are frictionally engaged. There is no possibility of moving to the proximal end side together with the inner needle 2.

内針２の針先２１が図８（ａ）に示されるようにプロテクタ６の保護部材６１の内部空間６１１に収容され、内針２の係合部２２が保護部材６１の基端側開口６１３部分の基端壁６１４
と係合すると、それ以降、保護部材６１は内針２と共に基端側へ移動する。しかし、閉鎖部材６２は外針ハブ５の環状凹部５４に嵌合固定されているため移動しない。したがって、閉鎖部材６２は保護部材６１の外周を先端側へと摺動して、保護部材６１の変位側壁６３が備えられた先端部の外周に配置される。そして、閉鎖部材６２が保護部材６１の先端部の溝部６３３が設けられた部分まで摺動すると、図８（ｂ）に示されるように閉鎖部材６２は内方向に収縮して前記外針ハブ５の環状凹部５４から離脱すると同時に、保護部材６１の溝部６３３に嵌合して保護部材６１に係止される。これにより外針ハブ５とプロテクタ６との係合固定は解除されるため、図８（ｃ）に示されるように針先２１がプロテクタ６によって保護された状態で、内針２の外針４および外針ハブ５からの抜去操作は完了する。 As shown in FIG. 8A, the needle tip 21 of the inner needle 2 is accommodated in the internal space 611 of the protection member 61 of the protector 6, and the engagement portion 22 of the inner needle 2 is the proximal end side opening 613 of the protection member 61. Partial proximal wall 614
After that, the protective member 61 moves to the proximal end side together with the inner needle 2. However, the closing member 62 does not move because it is fitted and fixed to the annular recess 54 of the outer needle hub 5. Therefore, the closing member 62 slides on the outer periphery of the protection member 61 toward the distal end side, and is disposed on the outer periphery of the distal end portion provided with the displacement side wall 63 of the protection member 61. Then, when the closing member 62 slides to the portion where the groove 633 at the tip of the protective member 61 is provided, the closing member 62 contracts inward as shown in FIG. At the same time as it is detached from the annular recess 54, it fits into the groove 633 of the protection member 61 and is locked to the protection member 61. As a result, the engagement and fixation between the outer needle hub 5 and the protector 6 are released, so that the outer needle 4 of the inner needle 2 is protected with the needle tip 21 protected by the protector 6 as shown in FIG. And the extraction operation from the outer needle hub 5 is completed.

以上、閉鎖部材が一部が切断された環状体あるいは弾性材料から形成された環状体であるプロテクタ６を例に挙げて、本発明の留置針組立体１の使用方法について説明したが、内方向へ付勢されない自然状態で保護部材６１の基端部に配置される閉鎖部材６４を備えたプロテクタ６を用いる場合も、同様の操作により内針２の針先２１を確実に保護することが可能である。このような閉鎖部材６４を備えたプロテクタ６を用いる場合は、外針ハブ５とプロテクタ６とは、図示されるような環状凹部５４に代えて、環状突部により係合固定される。前記環状突部は、図２に示される内針２の針先２１が保護部材６１の内部空間６１に収容される前の状態で閉鎖部材６２よりも基端側の外針ハブ５内周面に配置され、図８（ｂ）に示される状態に至るまでの内針２抜去操作によって閉鎖部材６２が移動することを防止する。しかし図８（ｃ）に示される針先２１収容後の状態では、閉鎖部材６２が保護部材６１の爪部６３５および６３６によって、環状突部との係合よりも強固に係合されることにより、プロテクタ６を内針２と共に外針ハブ５から離脱させることができる。 The method for using the indwelling needle assembly 1 according to the present invention has been described above by taking the protector 6 which is an annular body in which the closing member is partially cut or an annular body formed of an elastic material as an example. Even when the protector 6 including the closing member 64 disposed at the proximal end portion of the protection member 61 is used in a natural state without being biased toward the back, the needle tip 21 of the inner needle 2 can be reliably protected by the same operation. It is. When the protector 6 having such a closing member 64 is used, the outer needle hub 5 and the protector 6 are engaged and fixed by an annular protrusion instead of the annular recess 54 as shown. The annular protrusion is formed on the inner peripheral surface of the outer needle hub 5 on the base end side of the closing member 62 before the needle tip 21 of the inner needle 2 shown in FIG. 2 is accommodated in the inner space 61 of the protection member 61. The closing member 62 is prevented from moving by the operation of removing the inner needle 2 up to the state shown in FIG. However, in the state after the needle tip 21 is accommodated as shown in FIG. 8C, the closing member 62 is more firmly engaged by the claws 635 and 636 of the protection member 61 than the engagement with the annular protrusion. The protector 6 can be detached from the outer needle hub 5 together with the inner needle 2.

本発明のプロテクタ６が閉鎖部材６２および６４を保護部材６１の基端部に係止する第二の係止手段を有する場合も、保護部材６１と閉鎖部材６２または６４との第二の係止手段による係合よりも、閉鎖部材６２と環状凹部５４または環状突部との係合力が強くなるように形状を設定することにより、上述の内針２の針先２１保護操作をより確実に行うことが可能である。 Even when the protector 6 of the present invention has the second locking means for locking the closing members 62 and 64 to the proximal end portion of the protective member 61, the second locking of the protective member 61 and the closing member 62 or 64 is also possible. By setting the shape such that the engagement force between the closing member 62 and the annular recess 54 or the annular protrusion is stronger than the engagement by the means, the above-described operation of protecting the needle tip 21 of the inner needle 2 is performed more reliably. It is possible.

本発明の留置針組立体の一実施例の内針抜去前の状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state before inner needle extraction of one Example of the indwelling needle assembly of this invention. 図１に示される留置針組立体のプロテクタ部分の拡大縦断面図である。FIG. 2 is an enlarged longitudinal sectional view of a protector portion of the indwelling needle assembly shown in FIG. 1. 本発明の留置針組立体におけるプロテクタの一実施例の針先収容前の状態を示す斜視図である。It is a perspective view which shows the state before needle-tip accommodation of one Example of the protector in the indwelling needle assembly of this invention. 図３に示されるプロテクタの針先収容後の状態を示す斜視図である。It is a perspective view which shows the state after the needle tip accommodation of the protector shown by FIG. 本発明の留置針組立体におけるプロテクタの他の実施例の針先収容前の状態を示す斜視図である。It is a perspective view which shows the state before needle-tip accommodation of the other Example of the protector in the indwelling needle assembly of this invention. 本発明の留置針組立体におけるプロテクタの他の実施例の針先収容前の状態を示す斜視図である。It is a perspective view which shows the state before needle-tip accommodation of the other Example of the protector in the indwelling needle assembly of this invention. 図６に示されるプロテクタの針先収容後の状態を示す斜視図である。It is a perspective view which shows the state after needle tip accommodation of the protector shown in FIG. 図１に示される留置針組立体において、内針抜去時にプロテクタに内針の針先が収容される様子を示す説明図である。In the indwelling needle assembly shown in FIG. 1, it is explanatory drawing which shows a mode that the needle tip of an inner needle is accommodated in a protector at the time of inner needle removal.

Explanation of symbols

１留置針組立体
２内針
２１針先
２２係合部
３内針ハブ
４外針
５外針ハブ
５４環状凹部
６プロテクタ
６１保護部材
６１１内部空間
６１２先端開口
６１３基端開口
６１４基端壁
６１５先端壁
６１６側壁
６２、６４閉鎖部材
６３変位側壁
６３３、６３４溝部
６３５、６３６爪部 DESCRIPTION OF SYMBOLS 1 Indwelling needle assembly 2 Inner needle 21 Needle tip 22 Engagement part 3 Inner needle hub 4 Outer needle 5 Outer needle hub 54 Annular recessed part 6 Protector 61 Protection member 611 Inner space 612 End opening 613 Base end opening 614 Base end wall 615 End Wall 616 Side wall 62, 64 Closing member 63 Displacement side wall 633, 634 Groove 635, 636 Claw

Claims

An inner needle having a sharp needle tip at the tip and an engaging portion in the vicinity of the tip; an inner needle hub provided at the proximal end of the inner needle; an outer needle disposed on the outer periphery of the inner needle; an outer needle hub provided at the proximal end of the outer needle, the indwelling needle assembly comprising a needle tip protector of the inner needle is slidably disposed in the axial direction on the outer periphery of the inner needle,
The protector comprises an internal space capable of housing the needle tip of the inner needle, slidably and protective member capable of sliding on the inner needle in the axial direction, from the base end to the outer periphery of said protective member to the tip A closure member disposed,
Wherein the protective member, the inner needle body and the tip side opening capable of inserting the inner needle is the engaging portion is capable of insertion is provided in the passage non proximal side opening Rutotomoni tip of the protective member The portion is provided with a displacement side wall, and the displacement side wall is arranged so as not to give a biasing force to the inner needle when the closing member is arranged on the outer periphery of the proximal end portion of the protection member, when the needle tip of the inner needle is accommodated in the internal space of the protective member, inward so as to close the front end side opening by pre Symbol closure member is disposed at the distal end outer periphery of the protective member Is to be displaced,
It said closure member, before the needle point of the inner needle is housed in the internal space of the protective member is disposed on the outer periphery of the base end portion to which the displacement side walls of the protective member is not provided, the inner needle that the needle tip is disposed on the outer periphery of said tip portion in which the displacement side walls provided protection member the protective member an outer slides into the distal end side of the case housed in the internal space of the protective member And
The protector, before the needle point of the inner needle is housed in the internal space of the protective member is disposed within the outer needle hub, and the closure member and the inner peripheral surface of the outer needle hub engages the fixed It is, the engagement is by the inner needle is withdrawn to the proximal end side from the outer inner needle, the engaging portion of the inner needle is engaged with the proximal-side opening of the protective member the protective member is moved toward the proximal end side together with the inner needle, thereby being maintained until the closing member is disposed at the distal end outer periphery of the protective member to slide, the engagement is said closure member the released by being locked by the locking means provided in the protective member, the indwelling needle assembly in which departure from the outer needle hub of the protector becomes possible.

The engagement force between the closure member and the locking means provided on the protection member is stronger than the engagement between the inner peripheral surface of the outer needle hub and the closure member, and the engagement of the protection member When the inner needle is further removed in a state where the closing member is locked to the stopping means, the engagement between the inner peripheral surface of the outer needle hub and the closing member is released, and the protector The indwelling needle assembly according to claim 1, wherein the indwelling needle assembly can be detached from the outer needle hub.

The protective member of the protector includes a proximal wall having the proximal-side opening, and a distal wall having a distal side opening, said proximal end wall and said leading end wall and provided integrally with the axial direction of the inner needle The indwelling needle assembly according to claim 1, wherein the displacement side wall is provided on a part of the side wall.

The protective member of the protector includes a pair of opposing side walls, according to claim 3 indwelling needle assembly according one of the distal end portion of the side wall is the displacement sidewall.

The protective member of the protector has a four side walls surrounding the needle tip of the inner needle from all sides, claims the pair of displacement side walls a pair of tip facing the side walls is provided 3. The indwelling needle assembly according to 3.

The closure member of the protector includes an opening having the protective slightly smaller inner diameter than required for inserting the proximal end of the member, the proximal end of the protective member in a state of being urged inward The indwelling needle assembly according to any one of claims 1 to 5 , wherein the indwelling needle assembly is disposed on an outer periphery of the part.

The indwelling needle assembly according to claim 6 , wherein the closing member of the protector is an annular body partly cut.

The indwelling needle assembly according to claim 6 , wherein the closing member of the protector is an annular body formed of an elastic material.

Wherein said locking means provided at the distal end portion of the protective member, indwelling needle assembly according to any one of claims 6-8 wherein the closure member is at least one groove which can fit contracted by the urging force Solid.

The said closure member of the said protector is provided in the outer periphery of the base end part of the said protection member in the state which provided the opening part which has an internal diameter which can penetrate the base end of the said protection member, and does not give urging | biasing force to the said protection member. It made indwelling needle assembly according to any one of claims 1 to 5 which is a circular body.

Said locking means provided in the protective member is as claimed in claim 10, wherein a claw portion projecting outward towards the protruding from pawl portion and the distal end side outward toward the proximal side Indwelling needle assembly.

Engagement fixation between the closure member and the front of the inner peripheral surface of the outer needle hub needle tip of the inner needle is housed in the internal space of the protective member, an inner circumferential the closure member of the outer needle hub The indwelling needle assembly according to any one of claims 1 to 11 , wherein the indwelling needle assembly is formed by fitting into an annular recess formed on a surface.

Engagement fixation between the closure member and the front of the inner peripheral surface of the outer needle hub needle tip of the inner needle is housed in the internal space of the protective member, an inner circumferential the closure member of the outer needle hub The indwelling needle assembly according to any one of claims 1 to 11 , wherein the indwelling needle assembly is formed by engaging an annular protrusion formed on a surface of the base end side of the closing member.