JP2004008633A

JP2004008633A - Piercing structure of liquid infusing needle and mouth stopper, and the needle

Info

Publication number: JP2004008633A
Application number: JP2002168567A
Authority: JP
Inventors: Hisatada Noda; 野田　久正
Original assignee: Shimizu Pharmaceutical Co Ltd
Current assignee: Shimizu Pharmaceutical Co Ltd
Priority date: 2002-06-10
Filing date: 2002-06-10
Publication date: 2004-01-15
Anticipated expiration: 2022-06-10
Also published as: JP4284583B2

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems: a liquid infusing needle piercing a synthetic rubber-made mouth stopper easily comes off, and high resistance is given when the needle is stuck or pulled out. <P>SOLUTION: Two fixing projections 27 in a triangular pyramid shape which are protruded toward mutually opposite sides from positions close to a needle root 25a from a liquid introduction port 25e, and which are enlarged toward the needle root 25a are arranged on the outer peripheral surface of the needle tube 25 of the liquid infusion needle 3. A hemispherical mark 29 is arranged on the outer peripheral surface of the needle root 25a. The mouth stopper 33 includes a thin part 33b by forming oblong recessions 33a, 33a' each of which has a width dimension being substantially the same as the dimension of the diameter of the needle tube 25, and has a length being nearly the same as the maximum width W of the fixing projection 27. When the needle tube 25 penetrates the thin part 33b, and is rotated by 90°, the fixing projections 27 are engaged with parts which are not thin, and fixed. When the needle tube 25 is pulled-out, it is pulled out by turning the liquid infusion needle 3 in an original direction by viewing the mark 29. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、液体容器の口に取り付けられた合成ゴム製の口栓に液体導入針を突き刺す突き刺し構造に関するものである。
【０００２】
【従来の技術】
例えば医療用輸液回路における輸液瓶や輸液バッグと輸液セットとの連結は、一般に、輸液セットの一端にある導入針をバイアル瓶や輸液バッグの合成ゴム製の口栓に突き刺すだけで行うようにしている。
このような連結構造は、バイアル瓶や輸液バッグを開封せずに導入針を連結することが可能である。しかも連結及びその解除をほぼ１動作で行うことができるという優れた利点を有するが、その反面、導入針の抜止めは、ゴム栓と導入針との間の摩擦力だけに依存しているため、何らかの原因で導入針が引っ張られて口栓から外れてしまう事故が発生することがある。
【０００３】
そこで、口栓からの導入針の抜け止めをより確実にするための工夫が従来から提案されている。例えば、実公昭５０−１９３４４号公報には、Ｊスロット形の「割溝」を設けた栓体を注射液容器の口に取り付けると共に、導入針には鍔様に張り出した「ハンドル」を設け、導入針を栓体に突き刺した後これを軸回り方向へ回すことで、そのハンドルが割溝に係合して抜け止めが為されるようにしたものが記載されている。
また、実開昭６２−１１９９４６号公報には、導入針の針管部に円錐形の「リブ」を形成し、このリブが貫通するまで導入針を口栓に突き刺すと、そのリブが口栓の上面に係合して導入針が抜け難くなるというものが記載されている。
【０００４】
【発明が解決しようとする課題】
ところが、実公昭５０−１９３４４号公報に記載した導入針では、口栓がかなり複雑な形状であるため、金型の構造も複雑になり、製造コストが高くつくという問題がある。
また、実開昭６２−１１９９４６号公報に記載の導入針によると、針管本体の最大直径がリブの裾側直径まで拡大してかなり太いので、導入針を口栓に突き刺す際の抵抗が極めて大きいばかりか、導入針を口栓から引き抜くためには相当な力が必要となる。さらに、太いリブが口栓を貫くため口栓が裂けてしまったり、口栓の締め付け力が低下して液漏れが生じやすいという問題がある。
【０００５】
本発明は上記した従来の問題点に鑑みて為されたものであり、口栓に突き通した液体導入針が当該口栓から抜けるのを確実に防止することができ、それでいて液体導入針を口栓に突き通す際の抵抗がそれほど大きくなることも無く、且つ口栓が裂けるおそれも無い液体導入針と口栓との突き刺し構造を提供することを目的とする。
【０００６】
【課題を解決するための手段】
この目的を達成するための、請求項１の発明は、液体容器の口に取り付けられた合成ゴム製の口栓の薄肉部に液体導入針を突き刺す構造であって、液体導入針の針管の外周面には針元側に向かって裾広がりの形をした抜止め突起が設けられ、前記薄肉部は液体容器内側の面に凹部を設けることで形成されていることを特徴として成る。
【０００７】
請求項２に記載した発明は、請求項１に記載した液体導入針と口栓との突き刺し構造において、液体容器内側の面の凹部は、最大幅が針管の直径とほぼ同じ寸法を有する長穴状であることを特徴として成る。
【０００８】
請求項３に記載した発明は、請求項１または２に記載した液体導入針と口栓との突き刺し構造において、液体導入針を口栓の薄肉部に突き刺した状態で液体導入針の軸回り方向の位置を示す目印を具備したことを特徴として成る。
【０００９】
請求項４に記載した発明は、請求項１から４のいずれかに記載した液体導入針と口栓との突き刺し構造において、口栓の薄肉部は液体容器内側の面と外側の面の両方に凹部を設けることで形成されていることを特徴として成る。
【００１０】
請求項５に記載した発明は、請求項５に記載した液体導入針と口栓との突き刺し構造において、口栓の外側の面に形成された凹部は長穴状に形成されていることを特徴として成る。
【００１１】
請求項６に記載した発明は、液体導入針と口栓との突き刺し構造において、口栓の外側の面に形成された凹部は長穴状に形成されていることを特徴として成る。
【００１２】
請求項７に記載した発明は、請求項１から６のいずれかの記載した液体導入針と口栓との突き刺し構造に用いられ抜け止め突起が形成された液体導入針において、前記抜止め突起は、針元側に底面が向いたほぼ三角錐形を為すことを特徴として成る。
【００１３】
請求項８に記載した発明は、請求項７に記載した液体導入針において、抜け止め突起は、針管の軸心を挟んで互いに反対側へ突出するように設けられていることを特徴として成る。
【００１４】
【発明の実施の形態】
以下に、本発明の実施の形態に係る液体導入針と口栓との突き刺し構造を図面に従って説明する。
〔１．第一の実施の形態〕（図１〜図４）
図１から図４は、第一の実施の形態に係る液体導入針と口栓との突き刺し構造を示すものである。
【００１５】
〔Ａ．液体導入針〕（図１〜図４）
輸液セット１は、液体導入針３と、この液体導入針３が取り付けられた点滴筒５と、この点滴筒５から延びた輸液チューブ７の先端に合成ゴム管９を介して連結された輸液針取付けジャック１１と、輸液チューブ７が通されたロールクランプ１３とで構成されている。
液体導入針３は、点滴筒嵌合キャップ２１と、この点滴筒嵌合キャップ２１の閉鎖端面から短いテーパー管状に延びた合流管２３と、この合流管２３から長く延びた針管２５と、合流管２３から側方へ突出した短いタコ管２６とがプラスチックにより一体に形成されている。点滴筒嵌合キャップ２１が点滴筒５の一端部に外嵌されている。
【００１６】
針管２５は、基本的に反合流管２３側の端部が閉じた細身の円筒形をしており、針元２５ａはその他の部分よりやや太く形成されると共に、針先端２５ｂが先細りのテーパー形に形成されている。これら針元２５ａと針先端２５ｂとの間の部分が主部２５ｃである。この主部２５ｃにおける針先端２５ｂ寄りの位置から先端にかけての外周面に軸方向と平行に延びる深い溝２５ｄが形成され、この溝２５が軸心孔に通じた液体導入口２５ｅ（図１、図３参照）に連続している。
【００１７】
主部２５ｃの外周面における軸方向ほぼ中間位置、少なくとも液体導入口２５ｅより針元２５ａ側へ寄った位置に抜止め突起２７が２つ設けられている。この抜止め突起２７は、針管２５の軸心を挟んで互いに反対側へ突出するように設けられている。抜止め突起２７は、主部２５ｃの外周面から下斜め側方へ延びた稜線２７ａの両側に位置するほぼ直角三角形の２つの斜面２７ｂを有する概ね三角錐形をしている。従って、抜止め突起２７は針元２５ａ側を向いた平坦な底面２７ｃを有する。
この底面２７ｃから針元２５ａまでの距離Ｌ（図３（Ａ）参照）は、後述する口栓の厚さとほぼ同じになっている。また、抜止め突起２７の最大幅Ｗ（図３（Ａ）参照）、すなわち各稜線２７ａの下端どうしの間の寸法は、主部２５ｃの外径のほぼ１．５倍になっている。
【００１８】
針元２５ａの外周面のうち主部２５ｃ寄り位置には、半球形をした小さな目印２９が形成されている。この２つの目印２９は、軸回り方向における位置が抜止め突起２７と各別に同じである位置に設けられており、この目印２９が設けられている法線上に抜止め突起２７が在ることを示している。
【００１９】
〔Ｂ．口栓〕（図２〜図４）
符号３１は液体容器としてのバイアル瓶を示す。このバイアル瓶３１には所要の薬液が充填されると共に、その口は、口栓３３付きのキャップ３５が固着されることで密閉されている。キャップ３５の頂面には円形の大きな孔３５ａが形成され、また、口栓３３は合成ゴム等で厚い円板形を為している。口栓３３はキャップ３５内に挿入されており、キャップ３５に固着されてキャップ３５の孔３５ａが密閉される。
【００２０】
口栓３３の外側の面（液体容器外側の面）の中央部には凹部３３ａが形成され、内側の面（液体容器内側の面）の中央部には凹部３３ａ′が形成されている。外側の面の凹部３３ａと内側の面の凹部３３ａ′は対応する位置に形成され、凹部３３ａ、３３ａ′は共に開口部がほぼ長円形を為し、この長円形の長手方向に沿う垂直断面はほぼ半円形をしている。凹部３３ａと凹部３３ａ′の向きは互いに一致している。
従って、口栓３３は凹部３３ａ、３３ａ′が設けられることによって、その他の領域より肉厚が薄い薄肉部３３ｂが形成されている。
凹部３３ａ、３３ａ′の開口部の長手寸法は、液体導入針３に設けられている２つの抜止め突起２７どうしの幅Ｗより多少長くしてある。
液体導入針３と口栓３３は以上のように構成されている。
【００２１】
〔Ｃ．口栓に対する液体導入針の突刺しと抜止め〕（図２〜図４）
次に、口栓３３に対する液体導入針３の突刺しと抜止めなどを説明する。
口栓３３に液体導入針３を突き刺すときは、液体導入針３の針先端で口栓３３の外面側の凹部３３ａの中央を狙って突き刺す。このとき、液体導入針３の軸回り方向における向きを、図２及び図３（Ａ）に示すように、抜止め突起２７が凹部３３ａの長手方向に並ぶ向きとする。液体導入針３をこの向きにして口栓３３に突き刺すと、針管２５の主部２５ｃから針先端２５ｂにかけての部分と抜止め突起２７はいずれも口栓３３の薄肉部３３ｂを通されることになるので、突刺しの抵抗がかなり小さくて済む。
【００２２】
このようにして針管２５を口栓３３に突き刺して行くと、図３（Ｂ）に示すように、針元２５ａが凹部３３ａに近接する辺りまで来るのと同時に、抜止め突起２７が薄肉部３３ｂを貫いて口栓３３の内面から突出する（図４（Ａ）参照）。このことは、少なくとも目印２９が凹部３３ａに入る手前辺りまで針管２５突き刺すことで確実に達成される。
【００２３】
この状態から、液体導入針３を軸回りへ９０゜程度回すと、図３（Ｃ）及び図４（Ｂ）に示すように、抜止め突起２７が、口栓３３のうち突刺し凹部３３ａ′から外れた部分すなわち本来の肉厚を残しており且つ針管２５や抜止め突起２７の突刺しで切られなかった部分に対向する位置に来る。
液体導入針３が９０゜程度回転されたことは、目印２９が凹部３３ａの幅方向で並んだ状態を見ることで確認できる。
【００２４】
従って、この状態から仮に輸液セット１が引っ張られた場合、その引張り力は抜止め突起の底面２７ｃを口栓３３の内頂面にその垂直方向から係合させる力として働くことになり、この係合が為される部分は本来の肉厚が残され且つ針管２５や抜止め突起２７の突刺しで切られなかった部分であるから抜止め突起２７がここを裂きながら抜けることは通常は起こりえない。
【００２５】
また、このようにして口栓３３に突き刺した液体導入針３を抜くときは、先ず、液体導入針３をその目印２９が凹部３３ａ、３３ａ′の長手方向で並ぶ向きになるまで軸回りへ回す。これにより、抜止め突起２７が口栓３３の薄肉部３３ｂに対応するので、液体導入針３を引っ張れば容易に抜くことができる。特に内面側の凹部３３ａ′が形成されているので、液体導入針３を抜く際の抵抗を小さくできる。
【００２６】
〔２．第二の実施の形態〕（図５）
図５は、口栓３３の凹部の別の形態３７を示すものである。この凹部３７は、液体導入針３を軸方向から見たときの針管２５と抜止め突起２７の総体的輪郭とほぼ同じ形及び大きさにしてあり、円形凹部の両脇に三角形の凹部３７ａが設けられた形をしている。従って、口栓３３の薄肉部３３ｂが必要最小限の大きさで足りるので口栓３３の強度を低下させないで済むと共に、口栓３３に突き通した後に液体導入針３を軸回りへ少しでも回すと抜止め突起２７が薄肉部３３ｂ以外の部分に対向するので、操作が簡単で済む。
【００２７】
以上、本発明の実施の形態を説明したが、本発明の具体的構成がこの実施の形態に限定されるものでは無く、本発明の要旨から外れない範囲での設計変更等があっても本発明に含まれる。
例えば、実施の形態においては、口栓の内外両面に凹部を設けたが、この凹部は口栓の内側の面だけに設けても良い。
口栓３３の外側の面に形成された長穴状の凹部３３ａ′は液体導入針３側の目印２９との関係において液体導入針３の軸回り方向の位置を目視により判断できる形状であれば、上記した長穴状に限らず楕円形、菱形等如何なる形状であってもよい。
【００２８】
【発明の効果】
以上のように、本発明によれば、合成ゴム製の口栓に突き通した液体導入針が当該口栓から抜けるのをほぼ確実に防止することができ、それでいて液体導入針を口栓に突き通す際の抵抗がそれほど大きくなることも無く且つ口栓に裂けが生じるおそれも無い。
【図面の簡単な説明】
【図１】本発明の第一の実施の形態に係る液体導入針を備えた輸液セットの一例を示す正面図である。
【図２】本発明の第一の実施の形態に係る口栓を供えたバイアル瓶の要部を、図１の液体導入針の要部と共に示す斜視図である。
【図３】図２に示す口栓に図１に示す液体導入針を突き刺す手順を（Ａ）から（Ｃ）へ順を追って示す断面図である。
【図４】口栓に液体導入針を突き刺した状態を示す底面図であって、（Ａ）は図３（Ｂ）に対応した図、（Ｂ）は図３（Ｃ）に対応した図である。
【図５】口栓の凹部の別の形態を示すもので、（Ａ）は斜視図、（Ｂ）は液体導入針を突き刺した状態の底面図である。
図である。
【符号の説明】
３…液体導入針　　２５…針管　　２５ａ…針元　　２５ｅ…液体導入口
２７…抜止め突起　　２９…目印　　３１…液体容器　　３３…口栓
３３ａ…内側の凹部　　３３ａ′…外側の凹部　　３３ｂ…薄肉部
３７…凹部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a piercing structure for piercing a liquid introduction needle into a synthetic rubber stopper attached to a mouth of a liquid container.
[0002]
[Prior art]
For example, the connection between an infusion bottle or infusion bag and an infusion set in a medical infusion circuit is generally performed by simply piercing the introduction needle at one end of the infusion set into the synthetic rubber stopper of the vial or the infusion bag. I have.
Such a connection structure allows the introduction needle to be connected without opening the vial or the infusion bag. In addition, it has an excellent advantage that the connection and disconnection can be performed in almost one operation, but on the other hand, the stopping of the introduction needle depends only on the frictional force between the rubber stopper and the introduction needle. In some cases, an accident may occur in which the introduction needle is pulled for some reason and comes off the plug.
[0003]
Therefore, a device for more reliably preventing the introduction needle from coming off from the spout has been proposed. For example, in Japanese Utility Model Publication No. 50-19344, a plug provided with a J-slot-shaped "slit groove" is attached to the mouth of the injection solution container, and the introduction needle is provided with a "handle" that protrudes like a flange. It describes that an insertion needle is pierced into a stopper and then turned around an axis so that a handle of the introduction needle is engaged with a split groove to prevent the handle from coming off.
In Japanese Utility Model Application Laid-Open No. 62-119946, a conical "rib" is formed in the needle tube portion of the introduction needle, and the introduction needle is pierced into the plug until the rib penetrates. It describes that the introduction needle is difficult to be disengaged by engaging with the upper surface.
[0004]
[Problems to be solved by the invention]
However, the introduction needle described in Japanese Utility Model Publication No. 50-19344 has a problem in that the plug has a considerably complicated shape, so that the structure of the mold is complicated and the production cost is high.
In addition, according to the introduction needle described in Japanese Utility Model Application Laid-Open No. 62-119946, the maximum diameter of the needle tube body is enlarged to the hem side diameter of the rib and is considerably thick, so that the resistance when piercing the introduction needle into the spout is extremely large. In addition, considerable force is required to pull out the introduction needle from the plug. Further, there is a problem that the plug is torn because the thick rib penetrates the plug, and that the tightening force of the plug is reduced and liquid leakage easily occurs.
[0005]
The present invention has been made in view of the above-mentioned conventional problems, and can surely prevent a liquid introduction needle penetrating a plug from coming off from the plug, and yet still require the liquid introduction needle to be inserted into the mouth. It is an object of the present invention to provide a piercing structure between a liquid introduction needle and a plug which does not increase resistance when piercing the plug and does not cause a risk of tearing of the plug.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 has a structure in which a liquid introduction needle is pierced into a thin portion of a synthetic rubber stopper attached to a mouth of a liquid container, and the outer periphery of a needle tube of the liquid introduction needle The surface is provided with a retaining protrusion having a flared shape toward the needle base side, and the thin portion is formed by providing a concave portion on the inner surface of the liquid container.
[0007]
According to a second aspect of the present invention, in the piercing structure between the liquid introduction needle and the spout according to the first aspect, the concave portion on the inner surface of the liquid container has a long hole having a maximum width substantially equal to the diameter of the needle tube. It is characterized by having a shape.
[0008]
According to a third aspect of the present invention, in the piercing structure of the liquid introduction needle and the spout according to the first or second aspect, the liquid introduction needle is pierced into a thin portion of the spout in a direction around the axis of the liquid introduction needle. Is provided.
[0009]
According to a fourth aspect of the present invention, in the piercing structure between the liquid introduction needle and the plug according to any one of the first to fourth aspects, the thin portion of the plug is provided on both the inner surface and the outer surface of the liquid container. It is characterized by being formed by providing a concave portion.
[0010]
According to a fifth aspect of the present invention, in the piercing structure between the liquid introduction needle and the plug according to the fifth aspect, the concave portion formed on the outer surface of the plug is formed in a long hole shape. It consists as.
[0011]
The invention described in claim 6 is characterized in that, in the piercing structure between the liquid introduction needle and the plug, the concave portion formed on the outer surface of the plug is formed in an elongated hole shape.
[0012]
According to a seventh aspect of the present invention, in the liquid introduction needle according to any one of the first to sixth aspects, the retaining projection is used for a piercing structure between the liquid introduction needle and the spout, and the retaining projection is formed. And a substantially triangular pyramid whose bottom face faces the needle base.
[0013]
The invention described in claim 8 is characterized in that, in the liquid introduction needle described in claim 7, the retaining projections are provided so as to protrude to the opposite sides with respect to the axis of the needle tube.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a piercing structure between a liquid introduction needle and a plug according to an embodiment of the present invention will be described with reference to the drawings.
[1. First Embodiment] (FIGS. 1 to 4)
1 to 4 show a piercing structure between a liquid introduction needle and a plug according to the first embodiment.
[0015]
[A. Liquid introduction needle] (FIGS. 1 to 4)
The infusion set 1 includes a liquid introduction needle 3, a drip tube 5 to which the liquid introduction needle 3 is attached, and an infusion needle connected to a distal end of an infusion tube 7 extending from the drip tube 5 via a synthetic rubber tube 9. It comprises a mounting jack 11 and a roll clamp 13 through which the infusion tube 7 is passed.
The liquid introduction needle 3 includes a drip tube fitting cap 21, a merging tube 23 extending from the closed end face of the drip tube fitting cap 21 in a short tapered tube, a needle tube 25 extending from the merging tube 23, and a merging tube. A short octopus tube 26 projecting laterally from 23 is integrally formed of plastic. A drip tube fitting cap 21 is externally fitted to one end of the drip tube 5.
[0016]
The needle tube 25 is basically in the form of a thin cylinder with the end on the side opposite to the confluent tube 23 closed. The needle base 25a is formed slightly thicker than the other portions, and the needle tip 25b is tapered with a tapered end. Is formed. The portion between the needle base 25a and the needle tip 25b is the main portion 25c. A deep groove 25d extending in parallel with the axial direction is formed on the outer peripheral surface of the main portion 25c from a position near the needle tip 25b to the tip, and the groove 25 is formed in a liquid inlet 25e (FIGS. 1, FIG. 3).
[0017]
Two retaining protrusions 27 are provided at a substantially axially intermediate position on the outer peripheral surface of the main portion 25c, at least at a position closer to the needle base 25a side from the liquid inlet 25e. The retaining projections 27 are provided so as to project to opposite sides with respect to the axis of the needle tube 25. The retaining projection 27 has a substantially triangular pyramid shape having two substantially right-angled triangular slopes 27b located on both sides of a ridge line 27a extending obliquely downward from the outer peripheral surface of the main portion 25c. Therefore, the retaining projection 27 has a flat bottom surface 27c facing the needle base 25a side.
The distance L from the bottom surface 27c to the needle base 25a (see FIG. 3A) is substantially the same as the thickness of a plug described later. The maximum width W of the retaining projection 27 (see FIG. 3A), that is, the dimension between the lower ends of the ridge lines 27a is approximately 1.5 times the outer diameter of the main portion 25c.
[0018]
A small hemispherical mark 29 is formed on the outer peripheral surface of the needle base 25a at a position near the main portion 25c. The two marks 29 are provided at positions where the positions in the direction around the axis are respectively the same as the retaining protrusions 27, and it is determined that the retaining protrusions 27 are on the normal line where the marks 29 are provided. Is shown.
[0019]
[B. Spout] (Figs. 2 to 4)
Reference numeral 31 denotes a vial as a liquid container. The vial 31 is filled with a required chemical solution, and its mouth is sealed by fixing a cap 35 with a stopper 33. A large circular hole 35a is formed on the top surface of the cap 35, and the spout 33 has a thick disk shape made of synthetic rubber or the like. The plug 33 is inserted into the cap 35 and is fixed to the cap 35 so that the hole 35a of the cap 35 is sealed.
[0020]
A recess 33a is formed at the center of the outer surface (outside surface of the liquid container) of the plug 33, and a recess 33a 'is formed at the center of the inner surface (the surface inside the liquid container). The concave portion 33a on the outer surface and the concave portion 33a 'on the inner surface are formed at corresponding positions, and the concave portions 33a and 33a' both have substantially oval openings, and the vertical cross section along the longitudinal direction of the oval is It is almost semicircular. The directions of the recess 33a and the recess 33a 'coincide with each other.
Therefore, the plug 33 is provided with the concave portions 33a and 33a ', so that a thin portion 33b having a smaller thickness than other regions is formed.
The longitudinal dimension of the opening of the recesses 33a, 33a 'is slightly longer than the width W between the two retaining protrusions 27 provided on the liquid introduction needle 3.
The liquid introduction needle 3 and the spout 33 are configured as described above.
[0021]
[C. The insertion of the liquid introduction needle into the spout and the retaining thereof] (FIGS. 2 to 4)
Next, the piercing of the liquid introduction needle 3 with respect to the plug 33 and the stopping of the removal will be described.
When the liquid introducing needle 3 is pierced into the plug 33, the liquid introducing needle 3 is pierced with the tip of the liquid introducing needle 3 aiming at the center of the concave portion 33 a on the outer surface side of the plug 33. At this time, the direction of the liquid introduction needle 3 in the direction around the axis is, as shown in FIGS. 2 and 3A, the direction in which the retaining protrusion 27 is arranged in the longitudinal direction of the concave portion 33a. When the liquid introduction needle 3 is pierced into the plug 33 in this direction, the portion from the main portion 25c of the needle tube 25 to the needle tip 25b and the retaining projection 27 are both passed through the thin portion 33b of the plug 33. Therefore, piercing resistance can be considerably reduced.
[0022]
When the needle tube 25 is pierced into the plug 33 in this way, as shown in FIG. 3B, the needle base 25a comes close to the concave portion 33a, and at the same time, the retaining projection 27 moves to the thin portion 33b. And protrudes from the inner surface of the plug 33 (see FIG. 4A). This is surely achieved by piercing the needle tube 25 at least up to the position where the mark 29 enters the concave portion 33a.
[0023]
When the liquid introduction needle 3 is rotated by about 90 ° around the axis from this state, as shown in FIGS. 3 (C) and 4 (B), the retaining projection 27 pierces the stopper 33 of the plug 33. In other words, it comes to a position opposite to a portion that is not part of the needle tube 25 and the retaining projection 27 that has not been cut by the piercing of the needle tube 25 or the retaining projection 27.
The fact that the liquid introduction needle 3 has been rotated by about 90 ° can be confirmed by observing a state in which the marks 29 are arranged in the width direction of the concave portion 33a.
[0024]
Therefore, if the infusion set 1 is pulled from this state, the pulling force acts as a force for engaging the bottom surface 27c of the retaining projection with the inner top surface of the plug 33 from the vertical direction. The portion where the joining is performed is a portion where the original thickness is left and is not cut by the piercing of the needle tube 25 or the retaining projection 27, so that the retaining projection 27 is likely to come off while tearing it. Absent.
[0025]
When the liquid introduction needle 3 pierced into the plug 33 is pulled out, the liquid introduction needle 3 is first turned around the axis until the marks 29 are aligned in the longitudinal direction of the recesses 33a, 33a '. . As a result, since the retaining projection 27 corresponds to the thin portion 33b of the plug 33, the liquid introduction needle 3 can be easily removed by pulling. In particular, since the concave portion 33a 'on the inner surface side is formed, the resistance when pulling out the liquid introduction needle 3 can be reduced.
[0026]
[2. Second Embodiment] (FIG. 5)
FIG. 5 shows another form 37 of the concave portion of the plug 33. The recess 37 has substantially the same shape and size as the overall contour of the needle tube 25 and the retaining projection 27 when the liquid introduction needle 3 is viewed from the axial direction. Triangular recesses 37a are provided on both sides of the circular recess. It has the shape provided. Accordingly, since the thin portion 33b of the plug 33 is sufficient with a minimum necessary size, the strength of the plug 33 does not need to be reduced, and the liquid introduction needle 3 is slightly rotated around the axis after penetrating the plug 33. And the retaining projection 27 opposes a portion other than the thin portion 33b, so that the operation is simple.
[0027]
Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention, the present invention is not limited to this embodiment. Included in the invention.
For example, in the embodiment, the concave portion is provided on both the inner and outer surfaces of the plug, but the concave portion may be provided only on the inner surface of the plug.
The long hole-shaped concave portion 33a 'formed on the outer surface of the plug 33 has a shape that allows the position of the liquid introduction needle 3 in the direction around the axis to be visually determined in relation to the mark 29 on the liquid introduction needle 3 side. The shape is not limited to the above-mentioned elongated hole shape, but may be any shape such as an elliptical shape and a rhombic shape.
[0028]
【The invention's effect】
As described above, according to the present invention, it is possible to almost surely prevent the liquid introduction needle penetrating the synthetic rubber plug from coming off the plug, and yet to penetrate the liquid introduction needle through the plug. The resistance at the time is not so large, and there is no possibility that the plug will be torn.
[Brief description of the drawings]
FIG. 1 is a front view showing an example of an infusion set including a liquid introduction needle according to a first embodiment of the present invention.
FIG. 2 is a perspective view showing a main part of a vial provided with a plug according to the first embodiment of the present invention, together with a main part of a liquid introduction needle of FIG. 1;
FIG. 3 is a cross-sectional view showing a procedure for piercing the liquid introduction needle shown in FIG. 1 into the plug shown in FIG. 2 in order from (A) to (C).
FIGS. 4A and 4B are bottom views showing a state in which a liquid introduction needle is pierced into a plug, wherein FIG. 4A is a view corresponding to FIG. 3B and FIG. 4B is a view corresponding to FIG. is there.
5A and 5B show another form of the concave portion of the plug, in which FIG. 5A is a perspective view, and FIG. 5B is a bottom view in a state where the liquid introduction needle is pierced.
FIG.
[Explanation of symbols]
3 ... Liquid introduction needle 25 ... Needle tube 25a ... Needle base 25e ... Liquid introduction port 27 ... Retaining protrusion 29 ... Mark 31 ... Liquid container 33 ... Mouth plug 33a ... Inner recess 33a '... Outer recess 33b ... Thin portion 37 ... Recess

Claims

A structure in which a liquid introduction needle is pierced into a thin portion of a synthetic rubber stopper attached to a mouth of a liquid container, and an outer peripheral surface of a needle tube of the liquid introduction needle has a flared shape toward a needle base side. A piercing structure between a liquid introduction needle and a plug, wherein a retaining projection is provided, and the thin portion is formed by providing a concave portion on a surface inside the liquid container.

2. The liquid piercing structure according to claim 1, wherein the concave portion on the inner surface of the liquid container has an elongated hole shape having a maximum width substantially equal to the diameter of the needle tube. A piercing structure between the introduction needle and the spout.

3. The piercing structure between a liquid introduction needle and a plug according to claim 1 or 2, further comprising a mark indicating a position around the axis of the liquid introduction needle in a state where the liquid introduction needle pierces a thin portion of the plug. A piercing structure between the liquid introduction needle and the spout.

In the piercing structure between the liquid introduction needle and the plug according to any one of claims 1 to 3, the thin portion of the plug is formed by providing a concave portion on both the inner surface and the outer surface of the liquid container. A piercing structure between a liquid introduction needle and a spout.

In Claim 3 or 4, the mark indicating the position of the liquid introduction needle in the direction around the axis is composed of a mark on the plug side and a mark on the liquid introduction needle side, and the mark on the plug side is the outside of the plug. Wherein the recess is formed in a shape that allows the position of the liquid introduction needle in the direction around the axis to be visually determined in relation to the mark on the liquid introduction needle side. A piercing structure between the introduction needle and the spout.

The piercing structure between the liquid introduction needle and the plug according to claim 5, wherein the concave portion formed on the outer surface of the plug is formed in an elongated hole shape. Piercing structure.

A liquid introduction needle according to any one of claims 1 to 6, which is used for a piercing structure between the liquid introduction needle and a plug and has a retaining projection, wherein the retaining projection has a bottom surface facing the needle base side. A liquid introduction needle having a substantially triangular pyramid shape.

8. The liquid introduction needle according to claim 7, wherein the retaining projections are provided so as to project to opposite sides with respect to the axis of the needle tube.