JP2009142492A - Indwelling needle device - Google Patents

Indwelling needle device Download PDF

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Publication number
JP2009142492A
JP2009142492A JP2007323825A JP2007323825A JP2009142492A JP 2009142492 A JP2009142492 A JP 2009142492A JP 2007323825 A JP2007323825 A JP 2007323825A JP 2007323825 A JP2007323825 A JP 2007323825A JP 2009142492 A JP2009142492 A JP 2009142492A
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needle
shield
lumen
rear end
end side
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Raita Uematsu
雷太 植松
Ryoji Fujii
亮至 藤井
Naotsugu Ito
尚継 井藤
Kenji Sawa
健治 澤
Tsutomu Maeda
努 前田
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JMS Co Ltd
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JMS Co Ltd
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Priority to JP2007323825A priority Critical patent/JP2009142492A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an indwelling needle device so composed that it is capable of preventing blood accumulation in the inner needle while securing a cross section area of a flow passage from a tube to the inner cavity of the outer needle. <P>SOLUTION: The indwelling needle device comprises: a shield 4; a soft outer needle 8 fixed on the tip of the shield 4; an inner hub 2 inserted so as to be capable of moving in the inner cavity of the shield 4; a tube 3 connected to the rear end of the inner hub 2; and the hard inner needle 1 that is fixed on the tip of a hub and capable of being inserted into the inner cavity of the outer needle. The hub is provided with a horizontal gangway 2e passing through its inner cavity, and a space 13 between the outer circumferential surface of the hub and the inner circumferential surface of a shield tube communicates with the inner cavity 10 of the rear end of the hub through the horizontal gangway 2e. The inner needle has a side hole passing through its side wall, and the side hole allows fluid communication with a cavity located closer to the tip than the side hole on the inner needle and an area formed between the outer circumferential surface of the inner hub and the inner circumferential surface of the shield. The indwelling needle device is provided with a structure preventing fluid communication between a cavity located closer to the rear end than the side hole on the inner needle and the inner cavity of the rear end of the inner hub. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、使用後に硬質針を安全に収容できる誤穿刺防止用のシールドを有する留置針装置に関する。   The present invention relates to an indwelling needle device having a shield for preventing erroneous puncture that can safely store a hard needle after use.

留置針装置は、輸液や輸血、体外血液循環等の処置の際に広く使用され、種々の例が知られている。例えば、翼付の留置針装置では、穿刺針が翼部を有するハブの先端部に保持され、ハブの後端部に輸液用チューブが接続される。輸液を行う時には、翼部を患者の腕等に接着テープ等により固定して、穿刺針の穿刺状態を保持する。   Indwelling needle devices are widely used in the treatment of infusion, blood transfusion, extracorporeal blood circulation, and the like, and various examples are known. For example, in an indwelling needle device with a wing, the puncture needle is held at the distal end of a hub having a wing, and an infusion tube is connected to the rear end of the hub. When performing the infusion, the wing portion is fixed to the patient's arm or the like with an adhesive tape or the like, and the puncture state of the puncture needle is maintained.

一方、医療施設において、穿刺針等の誤穿刺による汚染・感染が問題となっている。従って誤穿刺事故を防止するために、翼部を有する円筒状のシールドを、穿刺針を保持したハブに対してスライド可能に設けた構造が知られている。つまり、円筒状シールドをスライドさせることにより、穿刺針が露出した状態と、シールド内に収納された状態とをとることが可能であり、穿刺針を使用後に廃棄する際には、穿刺針をシールド内にスライドさせて収納可能となっている。   On the other hand, in medical facilities, contamination / infection due to erroneous puncture such as a puncture needle is a problem. Therefore, in order to prevent accidental puncture accidents, a structure is known in which a cylindrical shield having wings is slidable with respect to a hub holding a puncture needle. In other words, by sliding the cylindrical shield, the puncture needle can be exposed and housed in the shield. When the puncture needle is discarded after use, the puncture needle is shielded. It can be stored by sliding in.

さらに、金属製の穿刺針を血管内に留置させることにより血管が損傷を受ける場合があるため、軟質の外針と硬質の内針を備え、外針の先端から突出させた内針により穿刺した後に、内針を外針から引き込むことを可能にした留置針装置の構造も知られている。また、その場合にも誤穿刺を防止するために、上述のような円筒状シールドと組み合わせて、外針を留置させた状態では、内針を円筒状シールド内に収納することを可能にした構造も知られている(例えば、特許文献1参照)。   Furthermore, since blood vessels may be damaged by placing a metal puncture needle in the blood vessel, a soft outer needle and a hard inner needle are provided, and puncture is performed with the inner needle protruding from the tip of the outer needle. A structure of an indwelling needle device that enables the inner needle to be retracted from the outer needle later is also known. Also in this case, in order to prevent erroneous puncture, it is possible to store the inner needle in the cylindrical shield in combination with the cylindrical shield as described above when the outer needle is indwelled. Is also known (see, for example, Patent Document 1).

このような誤穿刺防止用の円筒状シールドを有する二重針構造の留置針装置では、チューブは内針を保持するハブに接続され、内針を円筒状シールド内に引き込んだ状態では、チューブから外針の内腔に至る流路は、内針の内腔を経由することになる。ところが、内針の内腔は径が小さいため、十分な流量を確保することが困難である。   In such an indwelling needle device having a cylindrical shield for preventing erroneous puncture, the tube is connected to a hub that holds the inner needle, and when the inner needle is pulled into the cylindrical shield, the tube is removed from the tube. The flow path reaching the lumen of the outer needle passes through the lumen of the inner needle. However, since the lumen of the inner needle has a small diameter, it is difficult to ensure a sufficient flow rate.

そこで流量を確保するため、例えば、図14に示すように、内針100を保持するハブ200に、その外周面から内腔に貫通する横貫通路200eが形成され、ハブ200の外周面と円筒状シールド400aの内周面との間に形成される空間150が、上記横貫通路200aを介してハブ200の内腔と連通した留置針装置が開示されている。これにより、ハブ200と円筒状シールド400aの間に形成される空間が、内針100の内腔が形成する流路に追加される流路として機能するため、より大きな流量を確保できる。更に、ハブの内腔を、内針100の内腔よりも太くすれば、全体として、内針100の内腔だけの流路に比べて大きな流量を確保できる(例えば、特許文献2参照)。
特開2001−245980号公報 WO2006/100847
Therefore, in order to ensure the flow rate, for example, as shown in FIG. 14, the hub 200 that holds the inner needle 100 is formed with a lateral through passage 200 e that penetrates from the outer peripheral surface to the inner cavity, and An indwelling needle device is disclosed in which a space 150 formed between the inner peripheral surface of the shield shield 400a communicates with the lumen of the hub 200 via the lateral through passage 200a. Thereby, since the space formed between the hub 200 and the cylindrical shield 400a functions as a flow path added to the flow path formed by the lumen of the inner needle 100, a larger flow rate can be secured. Furthermore, if the hub lumen is made thicker than the lumen of the inner needle 100, a larger flow rate can be ensured as a whole than the flow path of only the lumen of the inner needle 100 (see, for example, Patent Document 2).
JP 2001-245980 A WO2006 / 100847

特許文献2に記載の留置針装置では、ハブ200がその内腔を介してチューブ300と連通する横貫通路200eを有することにより、全体として大きな流量を確保できる。しかし、上記横貫通路200eの径が内針100の内腔の径よりも遥かに大きいため、チューブ300から供給される液体のほとんどは、横貫通路200eを介して、ハブ200の外周面と円筒状シールド400aの内周面との間に形成される空間に供給される。そのため、穿刺時に内針100内に流入した血液が、内針100外に排出されることなく内針100内に滞留するおそれがあった。内針100内で血液が滞留すると、内針100内において血液が凝固して血栓が形成されるおそれがあり、好ましくない。   In the indwelling needle device described in Patent Document 2, a large flow rate can be ensured as a whole because the hub 200 has the lateral through passage 200e communicating with the tube 300 via its lumen. However, since the diameter of the lateral through passage 200e is much larger than the diameter of the inner lumen of the inner needle 100, most of the liquid supplied from the tube 300 passes through the lateral through passage 200e and the outer peripheral surface of the hub 200. It is supplied to the space formed between the inner peripheral surface of the cylindrical shield 400a. Therefore, blood that has flowed into the inner needle 100 at the time of puncture may be retained in the inner needle 100 without being discharged out of the inner needle 100. If blood stays in the inner needle 100, the blood may coagulate in the inner needle 100 to form a thrombus, which is not preferable.

本発明では、チューブから外針の内腔に至る流路の断面積を確保しながらも、内針内における血液の滞留を防止可能な構成の留置針装置を提供する。   The present invention provides an indwelling needle device having a configuration capable of preventing the retention of blood in the inner needle while ensuring the cross-sectional area of the flow path from the tube to the lumen of the outer needle.

本発明の留置針装置は、略円筒状のシールド筒を含むシールドと、前記シールドの先端部に固定された軟質の外針と、前記シールドの内腔において長手方向に移動可能なように挿入された内ハブと、前記内ハブの後端部に接続されたチューブと、前記内ハブの先端部に固定され前記外針の内腔に挿入可能な硬質の内針とを備え、前記内ハブが前記シールドの内腔の先端部に位置するときに、前記内針の先端は前記外針の内腔から外部に突出し、前記内ハブを前記シールドの内腔の後端側へ移動させることにより前記内針を前記シールドの内腔に収納可能である留置針装置において、前記内ハブにはその外周から内腔に貫通する横貫通路と前記横貫通路と前記チュ−ブの内腔とを流体連通させうる後端側内腔が形成されており、前記内ハブの外周面と前記シールドの内周面との間に形成される空間が、前記横貫通路を介して前記内ハブの後端側内腔と流体連通しており、前記内ハブにおける前記横貫通路よりも後端側の外周面に、前記内ハブの外周面と前記シールドの内周面との間の液密性を保持するための封止部が設けられ、前記内針は、その側壁を貫通した側孔を有し、前記側孔は、前記外針の先端から前記内針が突出する長さが最も長い状態において、前記外針の内腔内にあり、かつ、前記内針が前記側孔よりも先端側に有する内腔と、前記内ハブの外周面と前記シールドの内周面との間に形成される前記空間との間の流体連通を可能とし、前記内針が前記側孔よりも後端側に有する内腔と、前記内ハブの前記後端側内腔との流体連通を阻止する構造を有する。   The indwelling needle device of the present invention is inserted so as to be movable in the longitudinal direction in a shield including a substantially cylindrical shield tube, a soft outer needle fixed to the tip of the shield, and a lumen of the shield. An inner hub, a tube connected to a rear end portion of the inner hub, and a hard inner needle that is fixed to a distal end portion of the inner hub and that can be inserted into a lumen of the outer needle. When positioned at the tip of the lumen of the shield, the tip of the inner needle protrudes outward from the lumen of the outer needle, and the inner hub is moved to the rear end side of the lumen of the shield. In the indwelling needle device in which the inner needle can be stored in the lumen of the shield, the inner hub has a fluid passing through the lateral through passage penetrating from the outer periphery to the inner lumen, the lateral through passage, and the lumen of the tube. A rear end side lumen that can be communicated is formed, and the outside of the inner hub is formed. The space formed between the surface and the inner peripheral surface of the shield is in fluid communication with the rear end side lumen of the inner hub via the lateral through passage, and from the lateral through passage in the inner hub. Also, a sealing portion is provided on the outer peripheral surface on the rear end side to maintain liquid tightness between the outer peripheral surface of the inner hub and the inner peripheral surface of the shield, and the inner needle penetrates the side wall. The side hole is in the lumen of the outer needle in a state where the length of the inner needle protruding from the tip of the outer needle is the longest, and the inner needle is on the side Enabling fluid communication between a lumen having a distal end side than a hole and the space formed between an outer peripheral surface of the inner hub and an inner peripheral surface of the shield, and the inner needle is connected to the side hole. In addition, it has a structure that prevents fluid communication between the inner lumen on the rear end side and the rear end side lumen of the inner hub.

本発明によれば、チューブから外針の内腔に至る流路の断面積を確保しながらも、内針内における血液の滞留を防止可能な構成の留置針装置を提供できる。   ADVANTAGE OF THE INVENTION According to this invention, the indwelling needle apparatus of the structure which can prevent the residence of the blood in an inner needle can be provided, ensuring the cross-sectional area of the flow path from a tube to the lumen | bore of an outer needle.

本発明の留置針装置の好ましい一例では、内針が、側孔を有する中空針の、側孔よりも後端側の少なくともいずれかの箇所を閉塞する閉塞部を有することにより、内針が側孔よりも後端側に有する内腔と、内ハブの前記後端側内腔との流体連通が阻止されている。特に、内針が、その後端部に閉塞部を有する場合、内針の形成が容易であり、好ましい。   In a preferred example of the indwelling needle device of the present invention, the inner needle has a closed portion that closes at least one portion of the hollow needle having the side hole on the rear end side of the side hole, so that the inner needle is on the side. Fluid communication is prevented between the lumen on the rear end side of the hole and the rear end side lumen of the inner hub. In particular, when the inner needle has a closed portion at the rear end, it is preferable because the inner needle can be easily formed.

このような内針では、例えば、閉塞部は、中空針の側孔よりも後端側のいずれかの箇所が押し潰されることにより形成される。または、閉塞部は、中空針の側孔よりも後端側のいずれかの箇所に封止剤が充填されることにより形成される。   In such an inner needle, for example, the closing part is formed by crushing any part on the rear end side of the side hole of the hollow needle. Alternatively, the blocking portion is formed by filling the sealant in any location on the rear end side with respect to the side hole of the hollow needle.

本発明の留置針装置の好ましい一例では、内ハブが、横貫通路よりも先端側に設けられ内針が挿入された、先端側内腔を有する。そして、先端側内腔が、横穴貫通路と繋がらないように形成されていることにより、内針が側孔よりも後端側に有する内腔と、内ハブの後端側内腔との流体連通が阻止されている。この場合、内針が側孔を有する中空針であっても、内針が側孔よりも先端側に有する内腔と、内ハブの後端側内腔との流体連通を阻止できる。   In a preferred example of the indwelling needle device of the present invention, the inner hub has a distal-end-side lumen into which the inner needle is inserted and is provided closer to the distal-end side than the lateral through passage. And since the front end side lumen is formed so as not to be connected to the lateral hole through passage, the fluid between the inner needle has the rear end side with respect to the side hole and the rear end side lumen of the inner hub Communication is blocked. In this case, even if the inner needle is a hollow needle having a side hole, fluid communication between the inner cavity of the inner needle on the front end side of the side hole and the rear end side lumen of the inner hub can be prevented.

本発明の留置針装置の好ましい一例では、内ハブは、横貫通路よりも先端側を軸方向に貫通し内針が挿入された、先端側内腔を有する。そして、先端側内腔内および/または横貫通路内に、内針と横貫通路の連通を阻害する閉塞部材が配置されることにより、内針が側孔よりも後端側に有する内腔と、内ハブの後端側内腔との流体連通が阻止されている。この場合、内針が側孔を有する中空針であっても、内針が側孔よりも後端側に有する内腔と、内ハブの後端側内腔との流体連通を阻止できる。   In a preferred example of the indwelling needle device of the present invention, the inner hub has a distal end side lumen into which the inner needle is inserted by penetrating the distal end side in the axial direction from the lateral through passage. Then, by disposing a blocking member that inhibits the communication between the inner needle and the lateral through passage in the distal end side lumen and / or in the lateral through passage, the inner needle has a rear end side with respect to the side hole. And fluid communication with the rear end side lumen of the inner hub is prevented. In this case, even if the inner needle is a hollow needle having a side hole, fluid communication between the inner lumen of the inner needle on the rear end side of the side hole and the rear end side lumen of the inner hub can be prevented.

本発明の留置針装置の好ましい一例では、シールドの内周面に、係止凸部が設けられ、内ハブは、その一端が内ハブの他の部分によって支持され、内ハブの中心軸に向かって撓みうる、弾性片を含み、弾性片には、上記係止凸部と係合可能な係合凹部が形成されている。内ハブがシールドの後端側に移動されることにより、内針がシールド内に完全に引き込まれ、かつ、係止凸部が係合凹部と係合して、内ハブがシールド内を移動しないようにシールドに保持される。弾性片の数については、内ハブがシールド内を移動しないようにシールドに安全に保持可能であれば、特に制限はなく、1つでもよいが、弾性片を複数備えていると、内ハブがシールド内に、より確実に保持される点で好ましい。例えば、複数の弾性片が周方向に沿って等間隔に配置されていると、シールド内での内ハブのぐらつきが抑制され、内ハブはシールド内にさらに確実に保持される。   In a preferred example of the indwelling needle device of the present invention, a locking projection is provided on the inner peripheral surface of the shield, and one end of the inner hub is supported by the other part of the inner hub, and faces the central axis of the inner hub. The elastic piece includes an elastic piece, and the elastic piece is formed with an engaging concave portion that can be engaged with the locking convex portion. When the inner hub is moved to the rear end side of the shield, the inner needle is completely drawn into the shield, and the locking convex portion engages with the engaging concave portion, so that the inner hub does not move within the shield. So that it is held by the shield. The number of elastic pieces is not particularly limited as long as the inner hub can be safely held in the shield so that the inner hub does not move within the shield, and may be one, but if a plurality of elastic pieces are provided, This is preferable in that it is more reliably held in the shield. For example, when the plurality of elastic pieces are arranged at equal intervals along the circumferential direction, the wobbling of the inner hub in the shield is suppressed, and the inner hub is more securely held in the shield.

本発明の留置針装置の好ましい一例では、シールドに着脱可能に装着された内ハブ移動制御部材をさらに含む。内ハブ移動制御部材は、シールドの後端側からシールド内腔に挿抜可能に挿入されており、外針の先端から内針が突出する長さが最も長い状態の時に、内ハブにその先端を当接可能なストッパー部と、内ハブにストッパー部の先端が当接された状態を保持可能な保持部とを含む。この場合、穿刺操作時には内ハブをシールドに確実に保持でき、収納操作時には内ハブをシールド内においてスムーズに摺動できる。   A preferable example of the indwelling needle device of the present invention further includes an inner hub movement control member that is detachably attached to the shield. The inner hub movement control member is inserted in the shield lumen from the rear end side of the shield so that it can be inserted into and removed from the inner hub. A stopper portion that can be contacted, and a holding portion that can maintain a state in which the tip of the stopper portion is in contact with the inner hub. In this case, the inner hub can be securely held by the shield during the puncturing operation, and the inner hub can be smoothly slid within the shield during the storing operation.

上記保持部の好ましい一例は、ストッパー部の後端部に連結され、双方を両側から把持することにより互いの距離を狭めてシールドを把持し得る一対の片持部を含む。この形態では、収納操作時に、内ハブをシールド内においてきわめてスムーズに摺動できる。   A preferable example of the holding part includes a pair of cantilever parts which are connected to the rear end part of the stopper part and can hold the shield by reducing both distances by gripping both from both sides. In this form, the inner hub can slide very smoothly in the shield during the storing operation.

本発明の留置針装置の好ましい一例では、チューブに接続され、他の医療用具との接続が可能なコネクタをさらに含む。   In a preferred example of the indwelling needle device of the present invention, the indwelling needle device further includes a connector that is connected to a tube and can be connected to other medical devices.

以下に、本発明の実施の形態について、図面を参照して具体的に説明する。   Embodiments of the present invention will be specifically described below with reference to the drawings.

(実施形態1)
実施形態1では、本発明の留置針装置の一例について説明する。図1は、実施形態1の留置針装置の一例の長手方向に沿った断面図であり、図2は、図1に示した留置針装置の長手方向に沿った他の断面図である。図3は、図1に示した留置針装置の内針をシールド内に引き込んだ状態を示す断面図であり、図4は、図1に示した留置針装置の内針をシールド内に引き込んだ状態を示す他の断面図である。
(Embodiment 1)
Embodiment 1 demonstrates an example of the indwelling needle apparatus of this invention. FIG. 1 is a cross-sectional view along the longitudinal direction of an example of the indwelling needle device of Embodiment 1, and FIG. 2 is another cross-sectional view along the longitudinal direction of the indwelling needle device shown in FIG. FIG. 3 is a cross-sectional view showing a state in which the inner needle of the indwelling needle device shown in FIG. 1 is drawn into the shield, and FIG. 4 shows that the inner needle of the indwelling needle device shown in FIG. 1 is drawn into the shield. It is another sectional view showing a state.

図1〜図4に示すように、内針1は、例えば、樹脂製の内ハブ2の先端部に固定されている。内針1は、例えば、金属製の中空針の後端部の内腔内に樹脂等の充填剤を充填することにより形成された閉塞部1bを有している。上記中空針は、その先端側に、側壁を貫通した側孔1a(図6参照)を有している。内ハブ2の後端部にはチューブ3が接続されている。シールド4は、例えば、樹脂製の略円筒形状を有するシールド筒4aと、シールド筒4aの先端部に固定された外ハブ7とからなる。シールド4の内腔に、内針1および内ハブ2が挿入されて、長手方向に移動可能である。シールド4の材質としては、可撓性を有する樹脂材料、例えば、ポリカーボネート、ポリプロピレン、ポリエチレン、塩化ビニル樹脂、その他のエラストマーを用い、内ハブ2の材質としては、例えばポリカーボネートを用いることができる。   As shown in FIGS. 1-4, the inner needle 1 is being fixed to the front-end | tip part of the resin-made inner hubs 2, for example. The inner needle 1 has, for example, a blocking portion 1b formed by filling a filler such as a resin in the lumen of the rear end portion of a metal hollow needle. The hollow needle has a side hole 1a (see FIG. 6) penetrating the side wall on the tip side. A tube 3 is connected to the rear end of the inner hub 2. The shield 4 includes, for example, a shield cylinder 4a having a substantially cylindrical shape made of resin, and an outer hub 7 fixed to the tip of the shield cylinder 4a. The inner needle 1 and the inner hub 2 are inserted into the lumen of the shield 4 and are movable in the longitudinal direction. As the material of the shield 4, a flexible resin material such as polycarbonate, polypropylene, polyethylene, vinyl chloride resin, or other elastomer can be used, and as the material of the inner hub 2, for example, polycarbonate can be used.

外ハブ7の内腔には、円筒状の外針8が固定されている。外針8の内腔には内針1が挿入され、図1および図2に示した状態、すなわち、外針8の先端から内針1が突出する長さが最も長い状態では、外針8の先端から内針1の一部が突出している。外針8は、樹脂材料、例えばポリウレタン系エラストマーで形成される。   A cylindrical outer needle 8 is fixed in the inner cavity of the outer hub 7. In the state shown in FIGS. 1 and 2, that is, in the state in which the inner needle 1 protrudes from the tip of the outer needle 8 is the longest, the outer needle 8 is inserted into the lumen of the outer needle 8. A part of the inner needle 1 protrudes from the tip of the needle. The outer needle 8 is formed of a resin material, for example, a polyurethane elastomer.

内ハブ2の構造を拡大した斜視図を図5に示す。図5に示すように、内ハブ2は、前部2a、後部2b、およびそれらの間の中間部からなる。図5、図3および図4によれば、前部2aの外周面とシールド4の内周面との間の空間14が、前部2aに形成された横貫通路2eを介して内ハブ2の中間部および後部2bにおける後端側内腔10と連通している形態が判る。   An enlarged perspective view of the structure of the inner hub 2 is shown in FIG. As shown in FIG. 5, the inner hub 2 includes a front part 2a, a rear part 2b, and an intermediate part therebetween. According to FIGS. 5, 3, and 4, the space 14 between the outer peripheral surface of the front portion 2 a and the inner peripheral surface of the shield 4 is connected to the inner hub 2 via a lateral through passage 2 e formed in the front portion 2 a. The form which is connected with the rear end side lumen | bore 10 in the intermediate part and rear part 2b of FIG.

図1〜図5に示すように、内ハブ2の横貫通路2eよりも先端側には、軸方向に貫通した先端側内腔2fが形成されている。その先端側内腔2fには、内針1が挿入されている。後部2bは、後部2bの先端側21a(図5参照)によって支持された複数の弾性片21bと、チューブ接続部21d(図1〜図4参照)とを備えている。複数の弾性片21bは、チューブ接続部21dの外側において、チューブ接続部21dと離れて、周方向に沿って配置されており、複数の弾性片21bと、チューブ接続部21dとは、同心円状に配置されている。チューブ接続部21dにはチューブ3が装着されている。後端側内腔10(図1〜図4参照)の径は、より大きな輸液の流量を確保して、より迅速に後述のプライミング操作を可能とする観点から、外針1の内径と等しいかそれよりも大きく、チューブ3の内径と同等か、それよりも小さく設定されると好ましい。   As shown in FIG. 1 to FIG. 5, a distal end side lumen 2 f penetrating in the axial direction is formed on the distal end side of the lateral through passage 2 e of the inner hub 2. The inner needle 1 is inserted into the distal end side lumen 2f. The rear portion 2b includes a plurality of elastic pieces 21b supported by the distal end side 21a (see FIG. 5) of the rear portion 2b, and a tube connecting portion 21d (see FIGS. 1 to 4). The plurality of elastic pieces 21b are arranged along the circumferential direction, away from the tube connection portion 21d, outside the tube connection portion 21d, and the plurality of elastic pieces 21b and the tube connection portion 21d are concentrically formed. Has been placed. The tube 3 is attached to the tube connecting portion 21d. Is the diameter of the rear end side lumen 10 (see FIGS. 1 to 4) equal to the inner diameter of the outer needle 1 from the viewpoint of securing a larger infusion flow rate and enabling a priming operation described later more quickly? It is preferable that it is set larger than that and equal to or smaller than the inner diameter of the tube 3.

図1〜図5に示すように、内ハブ2の中間部における外周面には、封止用環状凹部2cが形成されている。封止用環状凹部2cは、後述する係止凹部21cよりも先端側であって、横貫通路2eよりも後端側に形成されており、Oリング11が装着されて封止部を形成している。この構成により、内ハブ2の外周面とシールド4の内周面との間の液密性が保持される。   As shown in FIGS. 1 to 5, a sealing annular recess 2 c is formed on the outer peripheral surface of the intermediate portion of the inner hub 2. The sealing annular recess 2c is formed on the front end side with respect to a locking recess 21c to be described later and on the rear end side with respect to the lateral through passage 2e, and the O-ring 11 is attached to form a sealing portion. ing. With this configuration, liquid tightness between the outer peripheral surface of the inner hub 2 and the inner peripheral surface of the shield 4 is maintained.

図1〜図4に示すように、シールド筒4aの内周面には、後述する係止凹部21cに対応させて、例えば、環状の係止凸部12bが設けられている。一方、図1〜図5に示すように、各弾性片21bのシールド4の内周面と対向する面(チューブ3と向かい合う面の反対面)には、上記係止凸部12bと係止可能な係合凹部21cが形成されている。これにより、内ハブ2がシールド4の後端側に移動されることにより、内針1がシールド4内に完全に引き込まれるとともに、係止凸部12bと係合凹部21cとが係合して、内ハブ2がシールド4内を移動しないようにシールド4内に安全に保持できる。なお、内ハブ2がシールド4内を移動しないようにシールド4に安全に保持可能であれば、弾性片21bの数について特に制限はなく、1つでもよい。しかし、複数の弾性片21bが、例えば、周方向に沿って等間隔に配置されていると、シールド4内での内ハブ2のぐらつきが抑制され、内ハブ2はシールド4内に確実に保持される。   As shown in FIGS. 1 to 4, for example, an annular locking convex portion 12 b is provided on the inner peripheral surface of the shield tube 4 a so as to correspond to a locking concave portion 21 c described later. On the other hand, as shown in FIGS. 1 to 5, the surface of the elastic piece 21 b facing the inner peripheral surface of the shield 4 (the surface opposite to the surface facing the tube 3) can be locked with the locking protrusion 12 b. An engaging recess 21c is formed. Thereby, when the inner hub 2 is moved to the rear end side of the shield 4, the inner needle 1 is completely pulled into the shield 4, and the locking convex portion 12 b and the engaging concave portion 21 c are engaged. The inner hub 2 can be safely held in the shield 4 so as not to move in the shield 4. Note that the number of the elastic pieces 21b is not particularly limited as long as the inner hub 2 can be safely held by the shield 4 so that the inner hub 2 does not move within the shield 4, and may be one. However, when the plurality of elastic pieces 21b are arranged at equal intervals along the circumferential direction, for example, the wobbling of the inner hub 2 in the shield 4 is suppressed, and the inner hub 2 is securely held in the shield 4. Is done.

図1および図2に示す初期状態では、内針1が外針8から突出して穿刺可能である。この状態では、内ハブ2の前部2aは、外ハブ7の内腔に挿入され、内ハブ2がシールド4内の先端側移動端に達している。そのため、この初期状態における、内ハブ2の外周面とシールド4の内周面の間に形成される空間を極小化できる。この状態で外針8と内針1とを穿刺した後、外針8を留置するために、図3および図4に示すように、内針1を外針8から突出しないように引き込んだ状態にする。   In the initial state shown in FIGS. 1 and 2, the inner needle 1 protrudes from the outer needle 8 and can be punctured. In this state, the front portion 2 a of the inner hub 2 is inserted into the inner cavity of the outer hub 7, and the inner hub 2 reaches the distal end side moving end in the shield 4. Therefore, the space formed between the outer peripheral surface of the inner hub 2 and the inner peripheral surface of the shield 4 in this initial state can be minimized. After puncturing the outer needle 8 and the inner needle 1 in this state, the inner needle 1 is retracted so as not to protrude from the outer needle 8 as shown in FIGS. To.

図3および図4に示す状態では、内ハブ2の前部2aが外ハブ7から脱しているので、前部2aの外周面とシールド4の内周面との間に空間14が形成されている。この空間14は、内針1の外周面とシールド4の内周面との間に形成された空間15を介して外針8の内腔に連通している。また、空間14は、横貫通路2eを介して内ハブ2の後端側内腔10と連通している。これにより、内ハブ2とシールド4の間に形成される空間14が流路として機能するため、例えば、内針が中空針であり、その内腔のみが流路として機能する場合よりも、大きな流量を確保できる。   In the state shown in FIGS. 3 and 4, the front portion 2 a of the inner hub 2 is detached from the outer hub 7, so that a space 14 is formed between the outer peripheral surface of the front portion 2 a and the inner peripheral surface of the shield 4. Yes. This space 14 communicates with the lumen of the outer needle 8 via a space 15 formed between the outer peripheral surface of the inner needle 1 and the inner peripheral surface of the shield 4. Further, the space 14 communicates with the rear end side lumen 10 of the inner hub 2 through the lateral through passage 2e. Thereby, since the space 14 formed between the inner hub 2 and the shield 4 functions as a flow path, for example, the inner needle is a hollow needle and larger than the case where only the lumen functions as a flow path. A flow rate can be secured.

図3および図4の状態では、係止凹部21cと係止凸部12bとが係合することにより、内ハブ2がシールド4に対して保持されている。内針1はシールド4内に収納されているので、誤穿刺の恐れは十分に軽減される。係止凹部21cと係止凸部12bの係合は、内針1の再突出を防止するために機能する。   In the state of FIG. 3 and FIG. 4, the inner hub 2 is held against the shield 4 by the engagement of the locking recess 21 c and the locking protrusion 12 b. Since the inner needle 1 is housed in the shield 4, the risk of erroneous puncture is sufficiently reduced. The engagement between the locking concave portion 21c and the locking convex portion 12b functions to prevent the inner needle 1 from re-projecting.

通常、留置針装置は、図1および図2の状態で使用に供される。穿刺操作はシールド4を把持することにより行う。   Usually, the indwelling needle device is used in the state shown in FIGS. The puncturing operation is performed by holding the shield 4.

次に、内針1および外針8の一例について、図6および図7を参照して説明する。図6は、内針の一例と外針の一例の拡大部分断面図であり、図7は、本発明の留置針装置の拡大部分断面図である。   Next, an example of the inner needle 1 and the outer needle 8 will be described with reference to FIGS. 6 and 7. FIG. 6 is an enlarged partial sectional view of an example of an inner needle and an example of an outer needle, and FIG. 7 is an enlarged partial sectional view of an indwelling needle device of the present invention.

図6に示すように、内針1は、その先端側に側孔1aを有している。側孔1aは、外針8の先端から内針1が突出する長さが最も長い状態において、外針8内にある。一方、図7に示すように、内針1の後端部の内腔内には樹脂やゴム等の封止剤が充填されて閉塞部1bが形成されている。そのため、内針1の内腔に流入した血液は、内針1の後端側の内腔を介しては内ハブの後端側内腔へは流れず、側孔1a内、および、外針8と内針1との間をこの順に通って、外周面と記シールドの内周面との間に形成される空間13(図7参照)に流入し、ひいては、横貫通路を通って内ハブの後端側内腔内に流入する。このように、本発明の一例では、内針1が側孔よりも後端側に有する内腔と、内ハブの前記後端側内腔との流体連通を阻止する構造を内針1が有しているので、内針1が側孔よりも後端側に有する内腔と、内ハブの前記後端側内腔との流体連通が許容されていた従来の留置針装置と比較して、内針1内で滞留しうる血液量を低減でき、よって、内針1内において血液が凝固して血栓が形成されるおそれを低減できる。   As shown in FIG. 6, the inner needle 1 has a side hole 1a on its distal end side. The side hole 1a is in the outer needle 8 in the state where the length of the inner needle 1 protruding from the tip of the outer needle 8 is the longest. On the other hand, as shown in FIG. 7, the inner end of the inner needle 1 is filled with a sealing agent such as resin or rubber to form a closed portion 1 b. Therefore, blood that has flowed into the lumen of the inner needle 1 does not flow to the rear end side lumen of the inner hub via the inner end side lumen of the inner needle 1, but in the side hole 1a and the outer needle. 8 and the inner needle 1 are passed in this order, and flow into a space 13 (see FIG. 7) formed between the outer peripheral surface and the inner peripheral surface of the shield, and then pass through the lateral through-passage to the inner side. It flows into the rear end side lumen of the hub. Thus, in an example of the present invention, the inner needle 1 has a structure that prevents fluid communication between the inner lumen of the inner needle 1 on the rear end side of the side hole and the rear end side lumen of the inner hub. Therefore, in comparison with the conventional indwelling needle device in which fluid communication between the lumen that the inner needle 1 has on the rear end side of the side hole and the rear end side lumen of the inner hub is allowed, The amount of blood that can stay in the inner needle 1 can be reduced, and thus the risk of blood coagulating and forming a thrombus in the inner needle 1 can be reduced.

側孔1aの内針1における形成箇所については、外針8の先端から内針1が突出する長さが最も長い状態(初期状態、図1および図2参照)において、可能な限り外針8の先端のより近くに側孔1aが形成されていると好ましい。この場合、内針1内に流入する血液量をより減らすことができ、よって、内針内に滞留しうる血液量をより減らすことができる。   As for the formation position of the side hole 1a in the inner needle 1, the outer needle 8 is as long as possible in the state where the inner needle 1 protrudes from the tip of the outer needle 8 (the initial state, see FIGS. 1 and 2). It is preferable that the side hole 1a is formed closer to the tip of the. In this case, the amount of blood flowing into the inner needle 1 can be further reduced, and thus the amount of blood that can stay in the inner needle can be further reduced.

外針8の先端部8aおよびその近傍の内径および外径は、外針8の先端に向かって小さくなっており、外針8の先端部8aの内周面は、内針1の外周面に接している。このように、外針8の先端部の内周面と内針1の外周面とが密着していると、良好な穿刺性を確保できるので、好ましい。この場合、内針1が側孔1aよりも先端側に有する内腔1cと、内ハブ2の外周面とシールド4の内周面との間に形成される空間13との間の流体連通が好適に行われるべく、側孔1aは、外針8の先端部の内周面と密着した内針1の外周面よりも、後端側に形成されると好ましい。   An inner diameter and an outer diameter of the distal end portion 8 a of the outer needle 8 and the vicinity thereof become smaller toward the distal end of the outer needle 8. It touches. Thus, it is preferable that the inner peripheral surface of the distal end portion of the outer needle 8 and the outer peripheral surface of the inner needle 1 are in close contact with each other because good puncture properties can be secured. In this case, fluid communication is established between the lumen 1 c that the inner needle 1 has on the tip side of the side hole 1 a and the space 13 formed between the outer peripheral surface of the inner hub 2 and the inner peripheral surface of the shield 4. In order to be suitably performed, the side hole 1a is preferably formed on the rear end side with respect to the outer peripheral surface of the inner needle 1 in close contact with the inner peripheral surface of the distal end portion of the outer needle 8.

外針8の先端部8aよりも基端側についてはその内径を大きくして、外針8の内周面と内針1の外周面とを離間させると、例えば、内針1の外周面に例えば溝などを設けなくても、内針1が側孔1aよりも先端側に有する内腔1cと、内ハブ2の外周面とシールド4の内周面との間に形成される空間13(図7参照)とを流体連通させることができ、好ましい。   When the inner diameter of the outer needle 8 is larger than the distal end portion 8a of the outer needle 8 and the inner peripheral surface of the outer needle 8 is separated from the outer peripheral surface of the inner needle 1, for example, For example, even if a groove or the like is not provided, a space 13 (between the inner cavity 1c that the inner needle 1 has on the tip side with respect to the side hole 1a, and the outer peripheral surface of the inner hub 2 and the inner peripheral surface of the shield 4 ( (See FIG. 7).

ところで、留置針装置内部を生理食塩水などで充填する「プライミング操作」を実施する際には、内ハブ2がシールド4内部の先端側に位置する初期状態で行う。図6および図7を用いて説明する本発明の留置針装置の一例では、チュ−ブの内腔、内ハブ2の後端側内腔10、横貫通路2e、上記空間13、および外針8の内面と内針1の外周面との間の隙間16(図6参照)をこの順に経て、側孔1aから内針1内に生理食塩水を流入させ、これらの流路内に生理食塩水を充填させることで、流路内の空気を排出できる。   By the way, when the “priming operation” in which the inside of the indwelling needle device is filled with physiological saline or the like is performed, it is performed in an initial state where the inner hub 2 is positioned on the distal end side inside the shield 4. In the example of the indwelling needle device of the present invention described with reference to FIGS. 6 and 7, the tube lumen, the rear end side lumen 10 of the inner hub 2, the transverse through passage 2e, the space 13, and the outer needle 8 passes through the gap 16 (see FIG. 6) between the inner surface of the inner needle 8 and the outer peripheral surface of the inner needle 1 in this order, and physiological saline is caused to flow into the inner needle 1 from the side hole 1a, and physiological saline is introduced into these channels. By filling with water, the air in the flow path can be discharged.

また、本発明の留置針装置の一例では、外針8が血管内に到達した状態で、内針1をシールド4内に引き込む必要がある。本発明の留置針装置では、内針1が側孔1aよりも先端側に有する内腔1cと、上記空間13とが、液体連通可能であるので、内針1が側孔1aよりも先端側に有する内腔1cに流入した血液が、側孔1a内、隙間16を通り、シールド4内に流入する(フラッシュバック)。これにより、外針8が血管を確保したことを、血液のフラッシュバックにより目視で確認できる。   Further, in the example of the indwelling needle device of the present invention, it is necessary to draw the inner needle 1 into the shield 4 with the outer needle 8 reaching the blood vessel. In the indwelling needle device of the present invention, the inner needle 1 is located on the distal end side with respect to the side hole 1a because the inner cavity 1c on the distal end side with respect to the side hole 1a and the space 13 can communicate with each other. The blood that has flowed into the inner lumen 1c passes through the side hole 1a and the gap 16 and flows into the shield 4 (flashback). Thereby, it can confirm visually by the flashback of the blood that the outer needle 8 ensured the blood vessel.

本発明の留置針装置の他の例を、図8〜図10に示している。   Other examples of the indwelling needle device of the present invention are shown in FIGS.

図8に示した例では、内針1の閉塞部1bが、側孔を有する中空針の後端部を押し潰すことにより形成されている。この例では、内針1がこのような形態をしていることにより、内針が側孔1a(図6参照)よりも後端側に有する内腔と、内ハブ1の後端側内腔10との流体連通が阻止されている。押し潰されることにより閉塞される箇所は、後端部に限定されず、中空針の側孔よりも後端側であれば、いずれの箇所であってもよい。   In the example shown in FIG. 8, the closed portion 1b of the inner needle 1 is formed by crushing the rear end portion of the hollow needle having a side hole. In this example, since the inner needle 1 has such a configuration, the inner needle has a lumen on the rear end side of the side hole 1a (see FIG. 6), and a rear end side lumen of the inner hub 1 Fluid communication with 10 is blocked. The location closed by being crushed is not limited to the rear end portion, and may be any location as long as it is the rear end side of the side hole of the hollow needle.

図9に示した例では、内ハブ2の横貫通路2eよりも先端側に設けられた先端側内腔2fが、横穴貫通路2eと繋がらないように形成されている。本発明では、このように、内針が側孔よりも後端側に有する内腔と、内ハブの後端側内腔10との流体連通を阻止する構造を内ハブ2が備えていてもよい。この場合、内針1として中空針を用いても、内針が側孔よりも後端側に有する内腔と、内ハブ1の後端側内腔10との流体連通を阻止できる。また、製造過程において閉塞部を形成する工程が不要である点で、好ましい。   In the example shown in FIG. 9, the distal end side lumen 2f provided on the distal end side with respect to the lateral through passage 2e of the inner hub 2 is formed so as not to be connected to the lateral hole through passage 2e. In the present invention, even if the inner hub 2 is provided with a structure for preventing fluid communication between the inner lumen of the inner needle on the rear end side of the side hole and the rear end side lumen 10 of the inner hub. Good. In this case, even if a hollow needle is used as the inner needle 1, fluid communication between the inner lumen of the inner needle 1 on the rear end side of the side hole and the rear end side lumen 10 of the inner hub 1 can be prevented. Moreover, it is preferable at the point which does not require the process of forming the obstruction | occlusion part in a manufacture process.

図10および図11に示した例では、内ハブ2の横貫通路2eよりも先端側に設けられた先端側内腔2fが、内ハブ2の横貫通路2eよりも先端側を軸方向に貫通しており、先端側内腔2f内および/または横貫通路2e内に、内針1と横貫通路2eの連通を阻害する閉塞部材20が配置されている。この場合、内針1として中空針を用いても、内針が側孔よりも後端側に有する内腔(図6参照)と、内ハブ1の後端側内腔10との流体連通を阻止できる。閉塞部材20の材料としては、例えば、ポリカーボネート、ポリプロピレン、イソプレンゴム、シリコーンゴム等が挙げられる。この場合、例えば、これらの材料を含む閉塞部材20によって内針1の後端側開口を塞いでから、内ハブ2の先端側内腔2f内に内針1を挿入すればよい。また、閉塞部材20の材料は、接着剤であってもよい。この場合、例えば、内針1の後端側開口を塞ぐように接着剤を塗布し、接着剤を硬化させてから、内ハブ2の先端側内腔2f内に内針1を挿入すればよい。これらの材料のうち、ガス滅菌がより良好に行われるという理由から、なかでも、イソプレンゴム、シリコーンゴムが好ましい。   In the example shown in FIG. 10 and FIG. 11, the distal end side lumen 2 f provided on the distal end side with respect to the lateral through passage 2 e of the inner hub 2 has an axial direction on the distal end side with respect to the lateral through passage 2 e of the inner hub 2. A blocking member 20 that is penetrating and that inhibits communication between the inner needle 1 and the lateral through passage 2e is disposed in the distal end side lumen 2f and / or in the lateral through passage 2e. In this case, even if a hollow needle is used as the inner needle 1, fluid communication between the lumen (see FIG. 6) that the inner needle has on the rear end side of the side hole and the rear end side lumen 10 of the inner hub 1 is performed. I can stop. Examples of the material of the closing member 20 include polycarbonate, polypropylene, isoprene rubber, and silicone rubber. In this case, for example, the inner needle 1 may be inserted into the distal end side lumen 2f of the inner hub 2 after the rear end side opening of the inner needle 1 is closed by the closing member 20 containing these materials. The material of the closing member 20 may be an adhesive. In this case, for example, an adhesive is applied so as to close the rear end side opening of the inner needle 1, and after the adhesive is cured, the inner needle 1 may be inserted into the distal end side lumen 2 f of the inner hub 2. . Of these materials, isoprene rubber and silicone rubber are particularly preferable because gas sterilization is performed better.

なお、図10に示した例において、内針1の後端側開口を閉塞部材20により塞いでから、内ハブ2の先端側内腔2f内に内針1を挿入する場合は、図11に示した例よりも、製造が容易である点で好ましい。また、図9に示した例よりも、内ハブ2の金型のピンが折れる可能性を低減できる点で好ましい。   In the example shown in FIG. 10, when the inner needle 1 is inserted into the distal end side lumen 2f of the inner hub 2 after the rear end side opening of the inner needle 1 is closed by the closing member 20, FIG. It is more preferable than the example shown because it is easier to manufacture. Moreover, it is more preferable than the example shown in FIG. 9 in that the possibility that the pins of the mold of the inner hub 2 are broken can be reduced.

内針1と外針8の穿刺後に外針8を留置するためには、チューブ3を介して内ハブ2をシールド筒4aの内部に引き込む力を加え、図3および図4に示す状態にする。すなわち、係止凹部21cと係止凸部12bとを係合させる。これにより、内針1が血管から引き抜かれ、外針8のみが穿刺された状態で留置される。   In order to place the outer needle 8 after the puncture of the inner needle 1 and the outer needle 8, a force for pulling the inner hub 2 into the shield tube 4a through the tube 3 is applied, and the state shown in FIGS. . That is, the engagement concave portion 21c and the engagement convex portion 12b are engaged. Thereby, the inner needle 1 is pulled out from the blood vessel, and only the outer needle 8 is punctured.

また、留置針装置を廃棄する際には、図3および図4の状態であれば、誤穿刺を防止できる。つまり、内針1がシールド4内に収納され、係止凹部21cと係止凸部12bの係合により、内針1が再突出することが阻止された状態になっているからである。   Further, when the indwelling needle device is discarded, erroneous puncture can be prevented as long as it is in the state shown in FIGS. That is, the inner needle 1 is housed in the shield 4, and the inner needle 1 is prevented from re-projecting by the engagement of the locking recess 21 c and the locking protrusion 12 b.

尚、本発明の留置針装置のさらに別の例では、シールド4が、1対の翼を備えた翼付シールドであってもよい。この場合、1対の翼は、シールド4の先端部、すなわち内針1が突出する側の端部に設けられる。1対の翼部は、例えば、各々、シールド4の外周面の両側部に結合し、シールド4の長手方向を中心として互いに対称な形状を有する。   In yet another example of the indwelling needle device of the present invention, the shield 4 may be a shield with wings provided with a pair of wings. In this case, the pair of wings are provided at the tip of the shield 4, that is, the end on the side from which the inner needle 1 protrudes. For example, the pair of wing portions are coupled to both side portions of the outer peripheral surface of the shield 4 and have symmetrical shapes with respect to the longitudinal direction of the shield 4.

(実施形態2)
実施形態2では、本発明の留置針装置の他の一例について説明する。図12は、本実施形態の留置針装置の一例の斜視図であり、図13は、図12に示した留置針装置を長手方向に沿って切断した部分断面図である。
(Embodiment 2)
Embodiment 2 demonstrates the other example of the indwelling needle apparatus of this invention. FIG. 12 is a perspective view of an example of the indwelling needle device of the present embodiment, and FIG. 13 is a partial cross-sectional view of the indwelling needle device shown in FIG. 12 cut along the longitudinal direction.

図12および図13に示す留置針装置は、内ハブ移動制御部材18をさらに備えていること以外は、実施形態1の留置針装置と同様の構成をしており、同一の部材については同一の符号を付してその説明を省略する。   The indwelling needle device shown in FIGS. 12 and 13 has the same configuration as that of the indwelling needle device of Embodiment 1 except that the indwelling needle movement control member 18 is further provided. Reference numerals are assigned and explanations thereof are omitted.

図12および図13に示すように、本実施形態の留置針装置における内ハブ移動制御部材18は、シールド4の後端側からシールド4内腔に挿抜可能なストッパー部18aと、下記形態の保持部を備えている。ストッパー部18aは、シールド4内に挿入され、その先端が、先端側移動端に達した内ハブ2の後端部端面2nに当接可能である。下記形態の保持部は、操作者により把持されることにより、外針8の先端から内針が突出する長さが最も長く、かつ、ストッパー部18aの先端が上記後端部端面2nに当接した状態、換言すると、内ハブ2がシールド4内の先端側移動端に達し、かつ、ストッパー部18aの先端が上記後端部端面2nに当接した状態を保持を可能とする。   As shown in FIGS. 12 and 13, the inner hub movement control member 18 in the indwelling needle device of the present embodiment includes a stopper portion 18 a that can be inserted into and removed from the shield 4 lumen from the rear end side of the shield 4, and the following configuration: Department. The stopper portion 18a is inserted into the shield 4 and its tip can be brought into contact with the rear end portion end surface 2n of the inner hub 2 reaching the tip side moving end. The holding portion of the following form has the longest length of the inner needle protruding from the tip of the outer needle 8 by being gripped by the operator, and the tip of the stopper portion 18a is in contact with the rear end portion end surface 2n. In other words, in other words, the state in which the inner hub 2 reaches the distal end side moving end in the shield 4 and the distal end of the stopper portion 18a is in contact with the rear end portion end surface 2n can be held.

内ハブ移動制御部材18は、一対の片持部18bを保持部として備えている。一対の片持部18bは、シールド4のシールド筒4aの上部外周の一部を覆う略半円筒形状部18cと、屈曲部18dとを介してストッパー部18aの後端部に連結されている。略半円筒形状部18cおよび一対の片持部18bは、シールド4のシールド4aの外周面から若干離間して配置されている。一対の片持部18bは、シールド4の側部の周囲に配置され、シールド4の長手方向の中心線に対して互いに対称に配置されている。   The inner hub movement control member 18 includes a pair of cantilever portions 18b as holding portions. The pair of cantilever portions 18b is connected to the rear end portion of the stopper portion 18a via a substantially semi-cylindrical portion 18c that covers a part of the upper outer periphery of the shield tube 4a of the shield 4 and a bent portion 18d. The substantially semi-cylindrical portion 18 c and the pair of cantilever portions 18 b are disposed slightly apart from the outer peripheral surface of the shield 4 a of the shield 4. The pair of cantilever portions 18 b are arranged around the side portion of the shield 4 and are arranged symmetrically with respect to the center line in the longitudinal direction of the shield 4.

一対の片持部18bは、双方を両側から把持することにより互いの距離を狭めてシールド4を把持し得る。一対の片持部18bによってシールド4を把持している間は、シールド4に対する内ハブ移動制御部材18の相対位置を変位させることなく保つことができる。よって、内ハブ2がシールド4内腔における先端側移動端に達した状態のときに、ストッパー部18aの先端を内ハブ2の後端部端面2nに当接させながら、一対の片持部18bでシールド4を把持すれば、その間、内ハブ2の移動を防止でき、穿刺操作を確実に行うことができる。   The pair of cantilever portions 18b can grip the shield 4 by narrowing the distance from each other by gripping both from both sides. While the shield 4 is gripped by the pair of cantilever portions 18b, the relative position of the inner hub movement control member 18 with respect to the shield 4 can be maintained without being displaced. Therefore, when the inner hub 2 has reached the distal end side moving end in the lumen of the shield 4, the pair of cantilever portions 18 b If the shield 4 is gripped, the movement of the inner hub 2 can be prevented during that time, and the puncture operation can be performed reliably.

図12に示すように、各片持部18bの一部が、翼部5,6と、シールド筒4aの長手方向同位置に配置されている場合、穿刺操作は、翼部5、6をシールド4の外周面に沿って上方に持ち上げ、これらを重ね合わせて把持することにより行える。このようにすれば、各片持部18bは翼部によってシールド4に押さえつけられ、一対の片持部18bは互いの距離が狭められ、一対の片持部18bによってシールド4が把持される。   As shown in FIG. 12, when a part of each cantilever part 18b is arrange | positioned in the longitudinal direction same position of the wing | blades part 5 and 6 and the shield cylinder 4a, puncture operation shields the wing | blades part 5 and 6 4 is lifted upward along the outer peripheral surface of 4 and can be held by overlapping them. In this way, each cantilever 18b is pressed against the shield 4 by the wings, the distance between the pair of cantilevers 18b is reduced, and the shield 4 is gripped by the pair of cantilevers 18b.

各片持部18bは、シールド4の側部の周囲に配置されているので、シールド4の上部の外周面は露出されている。そのため、使用に際しては、シールド4の上部の外周面に指を直接おいて、シールド4を患者側に押さえることができる。この操作により、チューブ3を引っ張って内針1をシールド4内に引込むことが容易に行える。   Since each cantilever part 18b is arrange | positioned around the side part of the shield 4, the outer peripheral surface of the upper part of the shield 4 is exposed. Therefore, in use, the shield 4 can be pressed to the patient side by placing a finger directly on the outer peripheral surface of the upper portion of the shield 4. By this operation, it is possible to easily pull the inner needle 1 into the shield 4 by pulling the tube 3.

図13では、内針1は、その先端が外針8から突出して穿刺可能な初期状態にある。この状態を維持する観点から、図13に示したストッパー部18aの長さは十分すぎる。しかし、図13に示すように、ストッパー部材18aの後端側がシールド4の後端から突出していれば、その突出部分をチューブ3とともに手で握ることができる。この場合、内ハブ移動制御部材18とチューブ3とを同時につかんだ状態で、内針1をシールド4内に引き込む操作が行い易くなる。   In FIG. 13, the inner needle 1 is in an initial state where the tip protrudes from the outer needle 8 and can be punctured. From the viewpoint of maintaining this state, the length of the stopper portion 18a shown in FIG. 13 is too sufficient. However, as shown in FIG. 13, if the rear end side of the stopper member 18 a protrudes from the rear end of the shield 4, the protruding portion can be grasped with the tube 3 by hand. In this case, it becomes easy to perform an operation of pulling the inner needle 1 into the shield 4 while the inner hub movement control member 18 and the tube 3 are held at the same time.

実施形態1の留置針装置および実施形態2の留置針装置はともに、チューブ3の両端部のうちの内ハブ2に接続されていない端部に、他の医療用具との接続が可能なコネクタ19が接続されていると好ましい。コネクタ19としては、例えば、図12に示すように、ISO(国際標準化機構)規格に適合したルアーテーパーを有する雄型接続部材等と嵌合可能な雌部19aを有していてもよい。あるいは、ISO(国際標準化機構)規格に適合したルアーテーパーを有する雌型接続部材等と嵌合可能な雄部を有していてもよい。また、コネクタは、雄部と、雄部を囲い内面に上記雌型接続部材と螺合可能な螺旋溝が形成されたキャップ部材とを備え、雌型接続部材内に雄部を圧入した後、上記キャップ部材を回転させることにより雌型接続部材と螺合させることが可能な、ルアーロックコネクタであってもよい。   Both the indwelling needle device of the first embodiment and the indwelling needle device of the second embodiment are connectors 19 that can be connected to other medical devices at the end portions of the tube 3 that are not connected to the inner hub 2. Are preferably connected. For example, as shown in FIG. 12, the connector 19 may have a female portion 19a that can be fitted to a male connection member having a luer taper conforming to the ISO (International Organization for Standardization) standard. Or you may have the male part which can be fitted with the female type | mold connection member etc. which have the lure taper corresponding to ISO (International Organization for Standardization) specification. Further, the connector comprises a male part and a cap member that surrounds the male part and has a cap member formed with a spiral groove that can be screwed together with the female connection member, and after the male part is press-fitted into the female connection member, A luer lock connector that can be screwed into the female connection member by rotating the cap member may be used.

本発明の留置針装置は、チューブから外針の内腔に至る流路の断面積を確保しながらも、内針内における血液の滞留を防止可能な構造であるので、輸液や輸血、体外血液循環等の処置に用いるために好適である。   Since the indwelling needle device of the present invention has a structure capable of preventing the retention of blood in the inner needle while ensuring the cross-sectional area of the flow path from the tube to the lumen of the outer needle, the infusion fluid, the blood transfusion, the extracorporeal blood It is suitable for use in treatments such as circulation.

図1は、実施形態1の留置針装置の一例の長手方向に沿った断面図1 is a cross-sectional view along the longitudinal direction of an example of an indwelling needle device according to Embodiment 1. FIG. 図2は、図1に示した留置針装置の長手方向に沿った他の断面図FIG. 2 is another cross-sectional view along the longitudinal direction of the indwelling needle device shown in FIG. 図3は、図1に示した留置針装置の内針をシールド内に引き込んだ状態を示す断面図3 is a cross-sectional view showing a state in which the inner needle of the indwelling needle device shown in FIG. 1 is drawn into the shield. 図4は、図1に示した留置針装置の内針をシールド内に引き込んだ状態を示す他の断面図4 is another cross-sectional view showing a state in which the inner needle of the indwelling needle device shown in FIG. 1 is drawn into the shield. 図5は、図1に示した留置針装置を構成する内ハブを拡大した斜視図5 is an enlarged perspective view of an inner hub constituting the indwelling needle device shown in FIG. 図6は、内針の一例と外針の一例の拡大部分断面図FIG. 6 is an enlarged partial cross-sectional view of an example of an inner needle and an example of an outer needle 図7は、実施形態1の留置針装置の一例の拡大部分断面図FIG. 7 is an enlarged partial sectional view of an example of the indwelling needle device according to the first embodiment. 図8は、実施形態1の留置針装置の他の一例の拡大部分断面図FIG. 8 is an enlarged partial cross-sectional view of another example of the indwelling needle device of the first embodiment. 図9は、実施形態1の留置針装置のさらに別の一例の拡大部分断面図FIG. 9 is an enlarged partial sectional view of still another example of the indwelling needle device according to the first embodiment. 図10は、実施形態1の留置針装置のさらに別の一例の拡大部分断面図FIG. 10 is an enlarged partial sectional view of still another example of the indwelling needle device according to the first embodiment. 図11は、実施形態1の留置針装置のさらに別の一例の拡大部分断面図FIG. 11 is an enlarged partial sectional view of still another example of the indwelling needle device according to the first embodiment. 図12は、実施形態2の留置針装置の一例の斜視図FIG. 12 is a perspective view of an example of the indwelling needle device according to the second embodiment. 図13は、図12に示した留置針装置を長手方向に沿って切断した部分断面図13 is a partial sectional view of the indwelling needle device shown in FIG. 12 cut along the longitudinal direction. 図14は、従来の留置針装置の一例を示す部分断面図FIG. 14 is a partial sectional view showing an example of a conventional indwelling needle device.

符号の説明Explanation of symbols

1 内針
1a 側孔
1b 閉塞部
1c 内針が側孔よりも先端側に有する内腔
2 内ハブ
2a 前部
2b 後部
2c 封止用環状凹部
2e 横貫通路
2f 先端側内腔
21b 弾性片
21c 係止凹部
3 チューブ
4 シールド
4a シールド筒
7 外ハブ
8 外針
10 後端側内腔
11 Oリング
12b 係止凸部
13、14、15 空間
16 隙間
18 内ハブ移動制御部材
18a ストッパー部
18b 片持部
20 閉塞部材
DESCRIPTION OF SYMBOLS 1 Inner needle 1a Side hole 1b Blocking part 1c Lumen which an inner needle has in the front end side rather than a side hole 2 Inner hub 2a Front part 2b Rear part 2c Sealing annular recessed part 2e Transverse passage 2f Front side lumen 21b Elastic piece 21c Locking recess 3 Tube 4 Shield 4a Shield tube 7 Outer hub 8 Outer needle 10 Rear end side lumen 11 O-ring 12b Locking convex part 13, 14, 15 Space 16 Gap 18 Inner hub movement control member 18a Stopper part 18b Cantilever Part 20 Blocking member

Claims (9)

略円筒状のシールド筒を含むシールドと、
前記シールドの先端部に固定された軟質の外針と、
前記シールドの内腔において長手方向に移動可能なように挿入された内ハブと、
前記内ハブの後端部に接続されたチューブと、
前記内ハブの先端部に固定され前記外針の内腔に挿入可能な硬質の内針とを備え、
前記内ハブが前記シールドの内腔の先端部に位置するときに、前記内針の先端は前記外針の内腔から外部に突出し、前記内ハブを前記シールドの内腔の後端側へ移動させることにより前記内針を前記シールドの内腔に収納可能である留置針装置において、
前記内ハブにはその外周から内腔に貫通する横貫通路と前記横貫通路と前記チュ−ブの内腔とを流体連通させうる後端側内腔が形成されており、前記内ハブの外周面と前記シールドの内周面との間に形成される空間が、前記横貫通路を介して前記内ハブの後端側内腔と流体連通しており、
前記内ハブにおける前記横貫通路よりも後端側の外周面に、前記内ハブの外周面と前記シールドの内周面との間の液密性を保持するための封止部が設けられ、
前記内針は、その側壁を貫通した側孔を有し、
前記側孔は、前記外針の先端から前記内針が突出する長さが最も長い状態において、前記外針の内腔内にあり、かつ、前記内針が前記側孔よりも先端側に有する内腔と、前記内ハブの外周面と前記シールドの内周面との間に形成される前記空間との間の流体連通を可能とし、
前記内針が前記側孔よりも後端側に有する内腔と、前記内ハブの前記後端側内腔との流体連通を阻止する構造を有する留置針装置。
A shield including a substantially cylindrical shield tube;
A soft outer needle fixed to the tip of the shield;
An inner hub inserted so as to be longitudinally movable in the lumen of the shield;
A tube connected to the rear end of the inner hub;
A hard inner needle fixed to the distal end of the inner hub and insertable into the lumen of the outer needle,
When the inner hub is located at the tip of the lumen of the shield, the tip of the inner needle protrudes outward from the lumen of the outer needle, and the inner hub moves to the rear end side of the lumen of the shield In the indwelling needle device capable of storing the inner needle in the lumen of the shield by
The inner hub is formed with a lateral through passage that penetrates from the outer periphery to the inner lumen, a rear end side lumen that allows fluid communication between the lateral through passage and the lumen of the tube. A space formed between the outer peripheral surface and the inner peripheral surface of the shield is in fluid communication with the rear end side lumen of the inner hub via the lateral through passage,
A sealing portion is provided on the outer peripheral surface of the inner hub on the rear end side of the lateral through-passage to maintain liquid tightness between the outer peripheral surface of the inner hub and the inner peripheral surface of the shield.
The inner needle has a side hole that penetrates its side wall,
The side hole is in the lumen of the outer needle in a state in which the inner needle protrudes from the distal end of the outer needle, and the inner needle has a distal end side with respect to the side hole. Enabling fluid communication between the lumen and the space formed between the outer peripheral surface of the inner hub and the inner peripheral surface of the shield;
An indwelling needle device having a structure that prevents fluid communication between a lumen that the inner needle has on the rear end side with respect to the side hole and the rear end side lumen of the inner hub.
前記内針が、前記側孔を有する中空針の、前記側孔よりも後端側の少なくともいずれかの箇所を閉塞する閉塞部を有することにより、前記内針が前記側孔よりも後端側に有する内腔と、前記内ハブの前記後端側内腔との流体連通が阻止されている請求項1に記載の留置針装置。   The inner needle has a closing portion that closes at least one portion of the hollow needle having the side hole on the rear end side with respect to the side hole, so that the inner needle is on the rear end side with respect to the side hole. 2. The indwelling needle device according to claim 1, wherein fluid communication between the inner lumen and the rear end side lumen of the inner hub is prevented. 前記閉塞部は、前記中空針の前記側孔よりも後端側のいずれかの箇所が押し潰されることにより形成された請求項2に記載の留置針装置。   The indwelling needle device according to claim 2, wherein the blocking portion is formed by crushing any portion of the hollow needle on a rear end side with respect to the side hole. 前記閉塞部は、前記中空針の前記側孔よりも後端側のいずれかの箇所に封止剤が充填されることにより形成された請求項2に記載の留置針装置。   The indwelling needle device according to claim 2, wherein the blocking portion is formed by filling a sealant at any location on the rear end side of the side hole of the hollow needle. 前記内針は、その後端部に前記閉塞部を有する請求項2に記載の留置針装置。   The indwelling needle device according to claim 2, wherein the inner needle has the closing portion at a rear end portion thereof. 前記内ハブは、前記横貫通路よりも先端側に設けられ前記内針が挿入された、先端側内腔を有し、
前記先端側内腔が、前記横穴貫通路と繋がらないように形成されていることにより、前記内針が前記側孔よりも後端側に有する内腔と、前記内ハブの前記後端側内腔との流体連通が阻止されている請求項1に記載の留置針装置。
The inner hub has a distal-end-side lumen into which the inner needle is inserted and is provided closer to the distal end than the lateral through-passage,
The distal end side lumen is formed so as not to be connected to the lateral hole through-passage, so that the inner needle has a rear end side with respect to the side hole, and the inner end of the inner hub on the rear end side. The indwelling needle device according to claim 1, wherein fluid communication with the cavity is prevented.
前記内ハブは、前記横貫通路よりも先端側を軸方向に貫通し前記内針が挿入された、先端側内腔を有し、前記先端側内腔内および/または前記横貫通路内に、前記内針と前記横貫通路の連通を阻害する閉塞部材が配置されることにより、前記内針が前記側孔よりも後端側に有する内腔と、前記内ハブの前記後端側内腔との流体連通が阻止されている請求項1に記載の留置針装置。   The inner hub has a distal end side lumen in which the inner needle is inserted through the distal end side in the axial direction with respect to the lateral through passage, and is in the distal end side lumen and / or in the lateral through passage. A closing member that inhibits communication between the inner needle and the lateral through passage is disposed, whereby the inner needle has a rear end side with respect to the side hole, and an inner side of the inner hub on the rear end side. The indwelling needle device according to claim 1, wherein fluid communication with the cavity is prevented. 前記シールドの内周面には、係止凸部が設けられ、
前記内ハブは、その一端が前記内ハブの他の部分によって支持され、前記内ハブの中心軸に向かって撓みうる、弾性片を含み、
前記弾性片には、前記係止凸部と係合可能な係合凹部が形成され、
前記内ハブが前記シールドの後端側に移動されることにより、前記内針が前記シールド内に完全に引き込まれるとともに、前記係止凸部が前記係合凹部と係合して、前記内ハブが前記シールド内を移動しないように前記シールドに保持される請求項1に記載の留置針装置。
On the inner peripheral surface of the shield, a locking projection is provided,
The inner hub includes an elastic piece, one end of which is supported by another portion of the inner hub and can be bent toward the central axis of the inner hub;
The elastic piece is formed with an engagement recess that can be engaged with the locking projection.
When the inner hub is moved to the rear end side of the shield, the inner needle is completely drawn into the shield, and the locking convex portion engages with the engaging concave portion. The indwelling needle device according to claim 1, wherein the indwelling needle device is held by the shield so as not to move in the shield.
前記シールドに着脱可能に装着された内ハブ移動制御部材をさらに含み、
前記内ハブ移動制御部材は、
前記シールドの後端側から前記シールド内腔に挿抜可能に挿入され、前記外針の先端から前記内針が突出する長さが最も長い状態の時に、前記内ハブにその先端を当接可能なストッパー部と、
前記内ハブに前記ストッパー部の先端が当接された状態を保持可能な保持部とを含み、
前記保持部は、前記ストッパー部の後端部に連結され、双方を両側から把持することにより互いの距離を狭めて前記シールドを把持し得る一対の片持部を含む請求項1に記載の留置針装置。
An inner hub movement control member detachably attached to the shield;
The inner hub movement control member is
When inserted into the shield lumen from the rear end side of the shield so that the inner needle protrudes from the distal end of the outer needle, the distal end of the inner hub can come into contact with the inner hub. A stopper part,
A holding portion capable of holding a state in which the tip of the stopper portion is in contact with the inner hub,
The indwelling apparatus according to claim 1, wherein the holding portion includes a pair of cantilever portions that are coupled to a rear end portion of the stopper portion and can grip the shield by reducing both distances by grasping both from both sides. Needle device.
JP2007323825A 2007-12-14 2007-12-14 Indwelling needle device Pending JP2009142492A (en)

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JP2011045532A (en) * 2009-08-27 2011-03-10 Mitsubishi Pencil Co Ltd Indwelling needle syringe
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US11110254B2 (en) 2015-05-15 2021-09-07 Terumo Kabushtkt Kaisha Catheter assembly
US11944764B2 (en) 2015-05-15 2024-04-02 Terumo Kabushiki Kaisha Catheter assembly

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