JP3998613B2

JP3998613B2 - Disposable syringe

Info

Publication number: JP3998613B2
Application number: JP2003208108A
Authority: JP
Inventors: 明正許; 沛揚許
Original assignee: 許明正; 沛揚許
Priority date: 2002-08-21
Filing date: 2003-08-20
Publication date: 2007-10-31
Anticipated expiration: 2023-08-20
Also published as: JP2005065708A

Description

【技術分野】
【０００１】
本発明は、使い捨て注射器に関するものであり、特に、使用後に針ユニットを筒に引込ませることにより注射器の安全な使用及び処分を可能とする使い捨て注射器である。
【背景技術】
【０００２】
図１において、筒１１、プランジャー１２及び針ユニット１３を含む従来の使い捨て注射器組立体１０が示されている。筒１１は、開口ネック端部１１１を有し、そこには、針ユニット１３のハブ１３１が取り付けられている。また、筒１１は、開口後端を有し、そこからプランジャー１２が摺動可能に挿入される。プランジャー１２の先端１２１は、しっくりと、かつ、Ｌの距離の範囲内で筒１１の内部側面に対して摺動可能に嵌められる。針ユニット１３は、さらに、ハブ１３１から延長した針１３２とハブ１３１の外周縁に嵌められる開口端を設けたキャップ１３３とを有し、針１３２は、キャップ１３３によって収容されている。注射器組立体１０の使用に際して、キャップ１３３はハブ１３１から取り外され、また、その使用後には、針１３２を覆うべく、元通りに取り付けられる。よって、針ユニット１３は、針１３２を覆っているキャップ１３３と共に筒１１から取り外される構成となっている。
【０００３】
しかしながら、医療や看護の業務に携わり、従来からの注射器組立体１０を取り扱う人々は、使い捨て注射器組立体１０を使用した後に、元通りにキャップ１３３をハブ１３１へと取り付けるに際して、針１３２を自らに刺してしまう危険性に晒される。これは、キャップ１３３の開口端が狭いことによるものである。さらに、前進されるプランジャー１２の先端がＰ地点で終結するため、開口ネック端部１１１にて薬液や血液が残ることもあり、注射器組立体１０を取り扱う人々は、針１３２を誤って自らに刺してしまったことにより、それら薬品等によって汚染される可能性もある。
【考案の開示】
【発明が解決しようとする課題】
【０００４】
本発明の目的は、より安全な使い捨て注射器を提供することにある。
【課題を解決するための手段】
【０００５】
本発明によるところ、使い捨て注射器は、軸を包囲するとともに縦方向に前記軸に対して垂直に配された対向する開口下端と開口上端を設けた通路を収容する内周を有する筒を有する。前記内周壁は、開口下端の近傍に配された大径部分と開口上端の近傍に配された小径部分とを有し、該大径部分と該小径部分とが協働して第一周辺段部を形成する。
【０００６】
管状の針シート部は、前記開口下端から前記開口上端へと前記通路に挿入可能に設けられている。該針シート部は、前記第一周辺段部に突き当たるように配された下周辺端部と、前記下周辺端部に対して縦方向に対向する上周辺端部と、前記下周辺端部と前記上周辺端部との間に配された周辺シート壁とを有する。該周辺シート壁は、前記軸を包囲することによってダクトを収容し、把持部を有する内管壁面と、外管壁面とを、有する。該外管壁面は、前記下周辺端部の近傍に配された下位部分と、前記上周辺端部の近傍に配され、該下位部分に対向する上位部分とを、有する。前記管状針シート部が前記通路に挿入された後に前記上周辺端部が開口上端へと押し上げられると、前記下位部分は、使用時の位置まで導かれ、この位置にて、前記下位部分は、前記小径部分に係合し、前記下周辺端部が第一周辺段部に突き当たって、前記下位部分と前記小径部分との間に第一摩擦力が生じることによって、前記下位部分は、前記小径部分に保持される。更に、前記上周辺端部が前記第一摩擦力に抵抗して前記大径部分を通過して前記開口下端へと移動されると、前記針シート部は、引っ込み時の位置まで導かれ、この位置にて、前記下位部分は、前記小径部分に対して離隔され、前記下周辺端部は、前記第一周辺段部に対して離隔される。前記外管壁面は、針ユニットに嵌るように設けられている。
【０００７】
プランジャーは、前記通路内で可動に配され、縦方向に対向する内側部分と外側部分とを有する茎部を含む。前記外側部分は、前記通路の前記開口下端から外方向に延びている。通路に沿って茎部を移動させるために作動される被作動端が設けられている。周辺係合部は、前記内側部分に挿着されて、第二摩擦力によって前記内側部分に保持され、前記大径部分に対して密封的に、かつ、使用時の位置への移動を可能ならしめるべく摺動可能に設けられている。ヘッド部は、前記内側部分から内管壁面の前記把持部へと延長して配されている。前記内側部分によって前記周辺係合部は前記下周辺端部に係合させられ、前記小径部分へと進行し続ける動作から生じ前記第二摩擦力よりも大きい第三の力によって前記周辺係合部は前記下周辺端部に押し下げられ、前記周辺係合部は、前記周辺端部に保持されると、前記ヘッド部は前記把持部へと移動することが可能となり、前記第一摩擦力より大きい第四摩擦力によって前記把持部で支持される。
【０００８】
本発明の特徴及び利益は以下の本発明の実施例の説明及び図面を参照することによって、より明らかになる。
【発明を実施するための最良の形態】
【０００９】
以下、本発明について、より具体的な説明をする。尚、以下の説明において、同じ構成部分については、同じ符号をもって表されている。
【実施例１】
【００１０】
図２、図３、及び図４において、針ユニット４０と共に注射器組立体を構成して使用される本発明に係る使い捨て注射器の第一実施例を示している。針ユニット４０は、ハブ４２とハブ４２に固定されている針４１を含んでいる。ハブ４２は、スリーブ部４２３を有し、そのスリーブ部４２３には縦方向に延びた複数の摩擦リブ４２１が形成されている。内部スリーブ端４３１を有する先端保護部４３は、針４１を保護すべく、スリーブ部４２３を被さるように形成されている。また、先端保護部４３は、摩擦リブ４２１と係合すべく、縦方向に延びた複数の摩擦リブ４３３を有している。
【００１１】
本実施例における注射器には、筒２０、管状の針シート部３０、及びプランジャー５０が含まれている。
【００１２】
筒２０は、軸Ｘを包囲し通路２１を収容する内周壁２２１を有している。通路２１は、縦方向において軸Ｘに平行して、対向する開口下端２１１と開口上端２１２とを有している。内周壁２２１は、開口下端２１１の近傍に大径部２１３と開口上端２１２の近傍に小径部２１４を有し、大径部２１３と小径部２１４とが協働して第一周辺段部２１５をお互いの間に形成している。筒２０の外周壁２２２の開口下端２１１には、指掛けフランジ２３が設けられている。小径部２１４は、第一周辺段部２１５の近傍に保持溝２２３と、第一周辺段部２１５から離れていて軸方向に延長された摩擦スプライン部２１６とを設けている。内側方向、かつ、大径部２１４の半径方向に突出する突起リング２１７が開口下端２１１に隣接して形成されている。
【００１３】
管状の針シート部３０は、通路２１内に開口下端２１１から開口上端２１２まで挿入可能に配されている。針シート部３０は、第一周辺段部２１５に突き当たるように配され、大径部２１３に密閉的に突き当たる外周面３３３を有する下周辺端部３３と、下周辺端部３３に対して縦方向に対向して配された上周辺端部３２１と、下周辺端部３３と上周辺端部３２１との間に配された周辺シート壁３２とを有している。
【００１４】
シート壁３２は、軸Ｘを囲んでダクト３１を収容する内管壁面３２４を有している。ダクト３１は、その直径が下周辺端部３３から上周辺端部３２１へと徐々に小さくなるように形成されている。内管壁面３２４は、把持部を形成している。本実施例では、把持部は、軸Ｘに対して半径方向に内管壁面３２４から内側へと延長された凹部３２６を設けており、これにより、下周辺端部３３に近接した第二周辺段部３２９が形成される。
【００１５】
シート壁３２は、さらに、下位部分３２２と上位部分３２３とを含む外管壁面３２５を有している。下位部分３２２は、下周辺端部３３の近傍に配されている。下位部分３２２には、保持突起部３２７が形成されている。管状針シート部３０が通路２１内に挿入され、上周辺端部３２１が筒２０の開口上端２１２から外へと押し出されると、図４に示されているように、下位部分３２２は、使用時の位置へと導かれる。この位置では、保持突起部３２７と保持溝２２３とが係合し保持されることによって、第一摩擦力が生じ、この第一摩擦力によって、下位部分３２２は小径部２１４と係合し、保持される。これとともに、下周辺端部３３の上端面３３１は、筒２０の第一周辺段部２１５に突き当たる。下位部分３２２は、さらに、軸方向に延びる摩擦スプライン部３２８を有している。摩擦スプライン部３２８と小径部２１４の摩擦スプライン部２１６とが協働する事によって、針シート部３０と筒２０との関係回転を防止できる。上位部分３２３は、下位部分３２２に対向し、上周辺端部３２１の近傍に配され、かつ、ハブ４２と針シート部３０のダクト３１とを連通させるために針ユニット４０のハブ４２をその上に挿着可能に形成されている。
【００１６】
プランジャー５０は、筒２０の通路２１内で可動な茎部５０ａを有している。茎部５０ａは、互いに傾斜して配された複数の羽根プレート５３と、羽根プレートの上端に配された周辺フランジ５１と、周辺フランジ５１から延びた連結シャンク５４と、保持突起部５４２とを有している。羽根プレート５３は、下方向へと先細に形成されている。また、茎部５０ａは、縦方向に対向する内側部分５０２と外側部分５０１とを有している。外側部分５０１は、筒２０の開口下端２１１から外へと延びている。外側部分５０１から親指掛けである被作動端５２が延在し、茎部５０ａを通路２１に沿って移動可能に作動される。
【００１７】
プランジャー５０は、さらに、ヘッド部５０ｂを有し、該ヘッド部５０ｂは、内側部分５０２の保持突起部５４２から針シート部３０の把持部へと延びるテーパー状の周辺突出部５４１と、軸沿いに周辺突出部５４１から２つの分割された分割半体５５２、５５３まで延びるスピンドル部５５とを含んでいる。分割半体５５２、５５３は、縦方向に直角に互いから離間され、それらの間に溝５５１が設けられている。分割半体５５２と５５３には、それぞれ上端アンカー縁を有している。好ましくは、スピンドル部５５の外径を周辺突出部５４１から分割半体５５２、５５３へと小さくなるようにスピンドル５５を形成する。更に、周辺突出部５４１及び保持突起部５４２は、柔軟性の向上を図るべく、略空洞状に形成されている。
【００１８】
内側部分５０２の保持突起部５４２全部及び周辺突出部５４１の一部に挿着して保持できるように変形可能な周辺係合部６０（例えば、弾力性を有する材料で構成されたもの）が設けられ、これにより第二摩擦力が生成されるのである。周辺係合部６０は、針シート部３０の下周辺端部３３に近傍な上端面６４と、縦方向に上端面に対向し、針シート部３０の下周辺端部３３に遠方な下端面６５と、それらの間に配された外周面６３とを有している。下端面６５は、空間Ｓをもって、周辺フランジ５１から離間されている。外周面６３は、筒２０の大径部２１３に対して、密封的に、かつ、茎部５０ａと動くために摺動可能に設けられている。尚、周辺係合部６０が大径部２１３に対して適切に摺動し得るように、外周面６３をＸ軸よりに窪ませて、外周面６３と大径部２１３との接触面積を減らすことが好ましい。
【００１９】
図５において、使用に際して、プランジャー５０は、押圧され、周辺係合部６０の上端面６４は、針シート部３０の下周辺端部３３の下端面３３２に突き当たるように前へと押し込まれる。スピンドル部５５は、上方向に先細に、かつ、針シート部３０の内管壁面３２４に一致するように形成されているため、通路２１内の薬液が、針ユニット４０を介して、ほぼ完全に注入されることが可能となる。
【００２０】
その後、図６において、内側部分５０２と周辺係合部６０との第二摩擦力に抵抗して、プランジャー５０が、第三の力によって、小径部２１４へと更に押し進められると、周辺係合部６０は、下周辺端部３３によって、変形される。これによって、空間Ｓは狭くなり、ヘッド部５０ｂの周辺突出部５４１が針シート部３０の凹部３２６まで進行し、第二周辺段部３２９に突き当たる。
【００２１】
一方、スピンドル部５５の分割半体５５２、５５３は、上周辺端部３２１へと進行すると、分割半体５５２と５５３は、互いに近寄るように内管壁面３２４によって偏向される。一旦、分割半体５５２、５５３とが上周辺端部３２１を超えるところまで前進すると、上端のアンカー縁５５４、５５５は、上周辺端部３２１と係合される。これによって、周辺突出部５４１と第二周辺段部３２９との間の摩擦力に加えて、第四摩擦力が生成され、保持突起部３２７と保持溝２２３との第一摩擦力よりも大きいものとなる。
【００２２】
図７に示されているように、使用後においては、プランジャー５０の外側部分５０１は、後方に引っ張られ、指掛けフランジ２３から離れる。これによって、使用後の針ユニット４０が取り付けられている針シート部３０は、上周辺端部３２１が引込み位置へと至るように、開口上端２１２を経由して、通路２１内に引込まれる。周辺フランジ５１が突起リング２１７に突き当たると、プランジャー５０は、それ以上移動することができなくなる。これによって、周辺係合部６０が開口下端２１１から取り外されることが抑制される。このような状態で、使用済みの針ユニット４０は、筒２０の通路２１内に収納され、安全に処分されることが可能となる。
【００２３】
従って、利用者が誤って針を刺すことや貫通させることの可能性は低い。よって、針の使用及び処分の安全性向上を図ることができる。
【００２４】
更に、内側部分５０２にある羽根プレート５３には、周辺フランジ５１の近傍に脆弱部５３１が設けられている。これを設けることによって、プランジャー５０が引込まれて周辺フランジ５１が突起リング２１７に突き当たった際に、脆弱部５３１は開口下端２１１から延在した状態となり、プランジャー５０の茎部５０ａを脆弱部５３１にて簡単に破断することができ、処分が容易となる。
【実施例２】
【００２５】
図８は、第一実施例に似ている構成を有する本発明に係る使い捨て注射器に第二実施例を示している。第一実施例と第二実施例の差は、第一実施例のようなスピンドル部が第二実施例に設けていないことである。弾力性を有する周辺係合部６０が保持突起部７４２の全部と周辺突出部７４１の一部とを覆って保持可能に設けられている。係合を図るべく、周辺係合部６０がプランジャー７０の茎部７３によって上方に押し上げられ、針シート部３０の下周辺端部３３に押し下げられると、周辺係合部６０は、下周辺端部３３によって保持される。これによって、図９に示されているように、周辺突出部７４１は、凹部３２６内に保持される。このようにして、図１０に示されているように、注射後においては、針シート部３０と針ユニット４０とを筒２０の通路２１内に引込められ、プランジャー７０の茎部７３を脆弱部７３１にて破断することができ、注射器の安全な処分が図られる。
【実施例３】
【００２６】
図１１及び図１２は、前記実施例に似ている構成を有する本発明に係る使い捨て注射器に第三実施例を示している。前記実施例と第三実施例の差は、第三実施例において、針４１と良好に係合できるように、管状の針シート部３０のダクト３１を上位部分３２３にて比較的小さな直径をもって形成していることである。これによって、ハブ４２を設ける必要が無くなる。
【００２７】
更に、第三実施例において、図２に示されるスリーブ部４２３の代わりに、開口上端２１２に近接してスリーブ部２２２１が筒２０の外周壁２２２に設けられている。そのスリーブ部２２２１には、複数の摩擦リブ２２４が形成されている。これによって、スリーブ部２２２１は、複数の摩擦リブ４３３をその内部スリーブ端４３１に設けている先端保護部４３と良好に係合することができ、針４１を保護することができる。
【００２８】
よって、第三実施例に係る注射器組立体を構成する部分（部品）の数を減らすことが可能となる。また、上記と同様に、注入動作の後は、針シート部３０と針４１とを筒２０の通路２１内に引込めることができる。
【実施例４】
【００２９】
図１３は、前記実施例に似ている構成を有する本発明に係る使い捨て注射器に第四実施例を示しており、第四実施例における使い捨て注射器は、１ｍｌなど極めて少量の注入容量のために使用される。よって、第四実施例における筒２０、針シート部３０、針４１、プランジャー７０、及び変形可能な周辺係合部６０の大きさは、それぞれ前記実施例のものよりも小さく形成されている。
【実施例５】
【００３０】
図１４及び図１５は、それぞれ前記第三実施例及び前記第四実施例に似ている構成を有する本発明に係る使い捨て注射器の第五実施例及び第六実施例を示している。第三実施例及び第四実施例と第五実施例及び第六実施例との差は、開口上端２１２が筒２０の内周壁２２１の小径部分２１４からＸ軸方向に延びた包囲端壁２１９を有し、その包囲端壁２１９がＸ軸を囲んでいる貫通孔２１０を収容していることである。このようにして、針４１は貫通孔２１０を通過することができ、開口上端２１２から外へと突き出ることが可能となる。
【実施例６】
【００３１】
図１５に示される第六実施例は、第五実施例と似た構成を採るものであるが、第六実施例における注射器は、１ｍｌなど極めて少量の注入容量のために使用される。
以上、本発明の好ましい実施形態を説明したが、本発明はこの実施形態に限定されず、本発明の趣旨を離脱しない限り、本発明に対するあらゆる変更は本発明の範囲に属する。
【図面の簡単な説明】
【００３２】
【図１】従来の使い捨て注射器組立体の縦方向における断面図である。
【図２】針ユニットと共に注射器組立体を構成する本発明に係る注射器の第一実施例の分解斜視図である。
【図３】第一実施例に係る注射器組立体の斜視図である。
【図４】使用時における第一実施例に係る注射器組立体の縦方向における断面図である。
【図５】使用時における第一実施例に係る注射器組立体の縦方向における断面図である。
【図６】プランジャーのヘッド部が針シート部のグリップ部によって支持されている状態にある第一実施例に係る注射器組立体の縦方向における断面図である。
【図７】引込み状態にある第一実施例に係る注射器組立体の縦方向における断面図である。
【図８】針ユニットと共に注射器組立体を構成する本発明に係る注射器の第ニ実施例の縦方向における断面図である。
【図９】プランジャーのヘッド部が針シート部のグリップ部によって支持されている状態にある第ニ実施例に係る注射器組立体の縦方向における断面図である。
【図１０】引込み状態にある第ニ実施例に係る注射器組立体の縦方向における断面図である。
【図１１】針ユニットと共に注射器組立体を構成する本発明に係る注射器の第三実施例の縦方向における分解断面図である。
【図１２】引込み状態にある第三実施例に係る注射器組立体の縦方向における断面図である。
【図１３】針ユニットと共に使用される本発明に係る注射器の第四実施例の縦方向における欠切断面図である。
【図１４】針ユニットと共に使用される本発明に係る注射器の第五実施例の縦方向における欠切断面図である。
【図１５】針ユニットと共に使用される本発明に係る注射器の第六実施例の縦方向における欠切断面図である。
【符号の説明】
【００３３】
２０筒
２１通路
３０針シート部
３３端部
４０針ユニット
５０、７０プランジャー
５０ｂヘッド部
５３ａ、７３茎部
６０周辺係合部
３２２下位部分
３２３上位部分【Technical field】
[0001]
The present invention relates to a disposable syringe, and in particular, a disposable syringe that enables safe use and disposal of a syringe by retracting a needle unit into a cylinder after use.
[Background]
[0002]
In FIG. 1, a conventional disposable syringe assembly 10 including a barrel 11, a plunger 12 and a needle unit 13 is shown. The tube 11 has an open neck end 111, to which a hub 131 of the needle unit 13 is attached. Moreover, the cylinder 11 has an opening rear end from which the plunger 12 is slidably inserted. The distal end 121 of the plunger 12 is fitted slidably with respect to the inner side surface of the cylinder 11 within a distance of L. The needle unit 13 further includes a needle 132 extended from the hub 131 and a cap 133 provided with an open end fitted to the outer peripheral edge of the hub 131, and the needle 132 is accommodated by the cap 133. In use of the syringe assembly 10, the cap 133 is removed from the hub 131 and, after use, is reattached to cover the needle 132. Therefore, the needle unit 13 is configured to be removed from the cylinder 11 together with the cap 133 that covers the needle 132.
[0003]
However, people who are engaged in medical or nursing work and who handle the conventional syringe assembly 10 use the disposable syringe assembly 10 and then attach the needle 132 to the hub 131 when attaching the cap 133 to the hub 131. You are exposed to the risk of stinging. This is because the opening end of the cap 133 is narrow. Furthermore, since the tip of the plunger 12 to be advanced is terminated at the point P, a drug solution or blood may remain at the opening neck end 111, and people handling the syringe assembly 10 mistakenly attach the needle 132 to themselves. There is a possibility of being contaminated by these chemicals and the like by being stabbed.
[Disclosure of device]
[Problems to be solved by the invention]
[0004]
An object of the present invention is to provide a safer disposable syringe.
[Means for Solving the Problems]
[0005]
According to the present invention, the disposable syringe has a cylinder having an inner periphery that encloses a shaft and accommodates a passage provided with a lower end of the opening and an upper end of the opening that are disposed vertically to the shaft . The inner peripheral wall has a large-diameter portion disposed in the vicinity of the lower end of the opening and a small-diameter portion disposed in the vicinity of the upper end of the opening. The large-diameter portion and the small-diameter portion cooperate to form a first peripheral step. Forming part.
[0006]
The tubular needle sheet portion is provided so as to be inserted into the passage from the lower end of the opening to the upper end of the opening. The needle sheet portion includes a lower peripheral end portion disposed so as to abut against the first peripheral step portion, an upper peripheral end portion that is vertically opposed to the lower peripheral end portion, and the lower peripheral end portion. And a peripheral sheet wall disposed between the upper peripheral end portions. The peripheral sheet wall encloses the shaft and accommodates the duct, and has an inner tube wall surface having a grip portion and an outer tube wall surface. The outer tube wall surface has a lower portion disposed in the vicinity of the lower peripheral end portion and an upper portion disposed in the vicinity of the upper peripheral end portion and facing the lower portion. When the upper peripheral end is pushed up to the upper end of the opening after the tubular needle sheet portion is inserted into the passage, the lower portion is guided to the position in use, and at this position, the lower portion is The lower peripheral portion engages with the small diameter portion, the lower peripheral end abuts against the first peripheral stepped portion, and a first frictional force is generated between the lower portion and the small diameter portion. Retained in the part. Further, when the upper peripheral end portion is moved to the lower end of the opening through the large diameter portion in resistance to the first frictional force, the needle sheet portion is guided to the position at the time of retraction, In position, the lower portion is spaced from the small diameter portion, and the lower peripheral edge is spaced from the first peripheral step. The outer tube wall surface is provided so as to fit into the needle unit.
[0007]
The plunger includes a stem that is movably disposed in the passage and has an inner portion and an outer portion that are vertically opposed. The outer portion extends outward from the lower end of the opening of the passage. An actuated end is provided that is actuated to move the stem along the passage. If the peripheral engagement portion is inserted into the inner portion and is held by the inner portion by the second frictional force, it is hermetically sealed with respect to the large diameter portion and can be moved to a position in use. It is provided so as to be slidable. The head portion extends from the inner portion to the grip portion on the inner tube wall surface. The peripheral engagement portion is engaged with the lower peripheral end portion by the inner portion, and the peripheral engagement portion is generated by a third force larger than the second frictional force resulting from the operation of continuing to proceed to the small diameter portion. Is pushed down by the lower peripheral end, and when the peripheral engaging portion is held by the peripheral end, the head portion can move to the gripping portion and is larger than the first frictional force. It is supported by the grip portion by the fourth frictional force.
[0008]
The features and advantages of the present invention will become more apparent by referring to the following description of the embodiments of the present invention and the drawings.
BEST MODE FOR CARRYING OUT THE INVENTION
[0009]
Hereinafter, the present invention will be described more specifically. In the following description, the same components are denoted by the same reference numerals.
[Example 1]
[0010]
2, 3, and 4, a first embodiment of the disposable syringe according to the present invention that is used by configuring a syringe assembly together with the needle unit 40 is shown. The needle unit 40 includes a hub 42 and a needle 41 fixed to the hub 42. The hub 42 has a sleeve portion 423, and a plurality of friction ribs 421 extending in the vertical direction are formed on the sleeve portion 423. The tip protection part 43 having the inner sleeve end 431 is formed so as to cover the sleeve part 423 in order to protect the needle 41. The tip protection part 43 has a plurality of friction ribs 433 extending in the vertical direction so as to engage with the friction ribs 421.
[0011]
The syringe in the present embodiment includes a cylinder 20, a tubular needle sheet portion 30, and a plunger 50.
[0012]
The cylinder 20 has an inner peripheral wall 221 that surrounds the axis X and accommodates the passage 21. The passage 21 has an opening lower end 211 and an opening upper end 212 facing each other in parallel with the axis X in the vertical direction. The inner peripheral wall 221 has a large-diameter portion 213 near the opening lower end 211 and a small-diameter portion 214 near the opening upper end 212, and the large-diameter portion 213 and the small-diameter portion 214 cooperate to form the first peripheral step 215. Formed between each other. A finger hook flange 23 is provided at the lower open end 211 of the outer peripheral wall 222 of the cylinder 20. The small-diameter portion 214 is provided with a holding groove 223 in the vicinity of the first peripheral step portion 215 and a friction spline portion 216 that is separated from the first peripheral step portion 215 and extends in the axial direction. A protruding ring 217 that protrudes inward and in the radial direction of the large-diameter portion 214 is formed adjacent to the opening lower end 211.
[0013]
The tubular needle sheet portion 30 is arranged in the passage 21 so as to be insertable from the opening lower end 211 to the opening upper end 212. The needle sheet portion 30 is arranged so as to abut against the first peripheral step portion 215, and has a lower peripheral end portion 33 having an outer peripheral surface 333 that abuts against the large diameter portion 213 in a hermetic manner, and a vertical direction with respect to the lower peripheral end portion 33 And a peripheral sheet wall 32 disposed between the lower peripheral end portion 33 and the upper peripheral end portion 321.
[0014]
The seat wall 32 has an inner tube wall surface 324 that surrounds the axis X and accommodates the duct 31. The duct 31 is formed such that its diameter gradually decreases from the lower peripheral end portion 33 to the upper peripheral end portion 321. The inner tube wall surface 324 forms a grip portion. In the present embodiment, the gripping portion is provided with a concave portion 326 extending inward from the inner tube wall surface 324 in the radial direction with respect to the axis X, whereby the second peripheral step adjacent to the lower peripheral end portion 33 is provided. A portion 329 is formed.
[0015]
The seat wall 32 further has an outer tube wall surface 325 including a lower portion 322 and an upper portion 323. The lower portion 322 is disposed in the vicinity of the lower peripheral end portion 33. A holding protrusion 327 is formed on the lower portion 322. When the tubular needle sheet portion 30 is inserted into the passage 21 and the upper peripheral end portion 321 is pushed out from the opening upper end 212 of the tube 20, as shown in FIG. To the position of. In this position, the holding protrusion 327 and the holding groove 223 are engaged and held to generate a first frictional force, and the first frictional force causes the lower portion 322 to engage with the small diameter portion 214 and hold. Is done. At the same time, the upper end surface 331 of the lower peripheral end portion 33 abuts against the first peripheral step portion 215 of the cylinder 20. The lower portion 322 further includes a friction spline portion 328 extending in the axial direction. The friction spline portion 328 and the friction spline portion 216 of the small diameter portion 214 cooperate to prevent relative rotation between the needle sheet portion 30 and the cylinder 20. The upper portion 323 faces the lower portion 322 and is disposed in the vicinity of the upper peripheral end portion 321, and the hub 42 of the needle unit 40 is disposed above the hub 42 and the duct 31 of the needle sheet portion 30 to communicate with each other. It is formed so that it can be inserted into the.
[0016]
The plunger 50 has a stem 50 a that is movable in the passage 21 of the cylinder 20. The stem portion 50a has a plurality of blade plates 53 that are inclined with respect to each other, a peripheral flange 51 that is disposed at the upper end of the blade plate, a connecting shank 54 that extends from the peripheral flange 51, and a holding projection 542. is doing. The blade plate 53 is formed to taper downward. Moreover, the stem part 50a has the inner part 502 and the outer part 501 which oppose the vertical direction. The outer portion 501 extends outward from the opening lower end 211 of the cylinder 20. An actuated end 52, which is a thumb rest, extends from the outer portion 501 and is actuated to move along the passage 21 along the stem 50 a.
[0017]
The plunger 50 further includes a head portion 50b. The head portion 50b includes a tapered peripheral protrusion 541 extending from the holding projection 542 of the inner portion 502 to the grip portion of the needle sheet portion 30, and along the axis. And a spindle portion 55 extending from the peripheral protrusion 541 to two divided half bodies 552 and 553. The divided halves 552 and 553 are spaced apart from each other at right angles to the longitudinal direction, and a groove 551 is provided therebetween. The split halves 552 and 553 each have a top anchor edge. Preferably, the spindle 55 is formed so that the outer diameter of the spindle portion 55 decreases from the peripheral protrusion 541 to the divided halves 552 and 553. Further, the peripheral protrusion 541 and the holding protrusion 542 are formed in a substantially hollow shape in order to improve flexibility.
[0018]
A peripheral engaging portion 60 (for example, made of a material having elasticity) that can be deformed so as to be inserted into and held by all the holding protrusions 542 of the inner portion 502 and a part of the peripheral protruding portion 541 is provided. As a result, a second frictional force is generated. The peripheral engagement portion 60 has an upper end surface 64 near the lower peripheral end portion 33 of the needle sheet portion 30, and a lower end surface 65 facing the upper end surface in the vertical direction and far from the lower peripheral end portion 33 of the needle sheet portion 30. And an outer peripheral surface 63 disposed between them. The lower end surface 65 has a space S and is separated from the peripheral flange 51. The outer peripheral surface 63 is slidably provided with respect to the large diameter portion 213 of the cylinder 20 so as to move with the stem portion 50a. The outer peripheral surface 63 is recessed from the X axis so that the peripheral engagement portion 60 can slide appropriately with respect to the large diameter portion 213, thereby reducing the contact area between the outer peripheral surface 63 and the large diameter portion 213. It is preferable.
[0019]
In FIG. 5, in use, the plunger 50 is pressed, and the upper end surface 64 of the peripheral engagement portion 60 is pushed forward so as to abut against the lower end surface 332 of the lower peripheral end portion 33 of the needle sheet portion 30. Since the spindle portion 55 is tapered upward and is formed so as to coincide with the inner tube wall surface 324 of the needle sheet portion 30, the chemical solution in the passage 21 is almost completely passed through the needle unit 40. Can be injected.
[0020]
Thereafter, in FIG. 6, when the plunger 50 is further pushed toward the small diameter portion 214 by the third force, resisting the second frictional force between the inner portion 502 and the peripheral engagement portion 60, the peripheral engagement is performed. The portion 60 is deformed by the lower peripheral end portion 33. As a result, the space S is narrowed, and the peripheral protrusion 541 of the head portion 50b advances to the concave portion 326 of the needle sheet portion 30 and hits the second peripheral step portion 329.
[0021]
On the other hand, when the divided halves 552 and 553 of the spindle portion 55 proceed to the upper peripheral end 321, the divided halves 552 and 553 are deflected by the inner tube wall surface 324 so as to approach each other. Once the split halves 552, 553 are advanced beyond the upper peripheral edge 321, the upper anchor edges 554, 555 are engaged with the upper peripheral edge 321. As a result, in addition to the frictional force between the peripheral protrusion 541 and the second peripheral step 329, a fourth frictional force is generated, which is greater than the first frictional force between the holding projection 327 and the holding groove 223. It becomes.
[0022]
As shown in FIG. 7, after use, the outer portion 501 of the plunger 50 is pulled rearward and away from the finger-hanging flange 23. Accordingly, the needle sheet portion 30 to which the used needle unit 40 is attached is drawn into the passage 21 via the opening upper end 212 so that the upper peripheral end portion 321 reaches the retracted position. When the peripheral flange 51 hits the protruding ring 217, the plunger 50 cannot move any further. Thereby, it is suppressed that the peripheral engaging part 60 is removed from the opening lower end 211. In such a state, the used needle unit 40 is stored in the passage 21 of the cylinder 20 and can be safely disposed of.
[0023]
Therefore, it is unlikely that the user will accidentally pierce or penetrate the needle. Therefore, the safety of use and disposal of the needle can be improved.
[0024]
Further, the blade plate 53 in the inner portion 502 is provided with a fragile portion 531 in the vicinity of the peripheral flange 51. By providing this, when the plunger 50 is retracted and the peripheral flange 51 abuts against the protruding ring 217, the fragile portion 531 is extended from the lower end 211 of the opening, and the stem portion 50a of the plunger 50 is moved to the fragile portion. It can be easily broken at 531 to facilitate disposal.
[Example 2]
[0025]
FIG. 8 shows a second embodiment of a disposable syringe according to the present invention having a configuration similar to that of the first embodiment. The difference between the first embodiment and the second embodiment is that the spindle portion as in the first embodiment is not provided in the second embodiment. An elastic peripheral engagement portion 60 is provided so as to be able to cover and hold the entire holding projection 742 and a part of the peripheral protrusion 741. When the peripheral engagement portion 60 is pushed upward by the stem portion 73 of the plunger 70 and pushed down by the lower peripheral end portion 33 of the needle sheet portion 30 in order to achieve engagement, the peripheral engagement portion 60 is moved to the lower peripheral end. It is held by the unit 33. As a result, the peripheral protrusion 741 is held in the recess 326 as shown in FIG. Thus, as shown in FIG. 10, after injection, the needle sheet portion 30 and the needle unit 40 are retracted into the passage 21 of the cylinder 20, and the stem portion 73 of the plunger 70 is weakened. It can be broken at the portion 731 and safe disposal of the syringe is achieved.
[Example 3]
[0026]
11 and 12 show a third embodiment of a disposable syringe according to the present invention having a configuration similar to that of the above embodiment. The difference between the third embodiment and the third embodiment is that in the third embodiment, the duct 31 of the tubular needle seat portion 30 is formed with a relatively small diameter in the upper portion 323 so that the needle 41 can be satisfactorily engaged. Is. This eliminates the need to provide the hub 42.
[0027]
Furthermore, in the third embodiment, instead of the sleeve portion 423 shown in FIG. 2 , a sleeve portion 2221 is provided on the outer peripheral wall 222 of the cylinder 20 in the vicinity of the upper end 212 of the opening. A plurality of friction ribs 224 are formed on the sleeve portion 2221. As a result, the sleeve portion 2221 can satisfactorily engage the tip protection portion 43 provided with the plurality of friction ribs 433 at the inner sleeve end 431, thereby protecting the needle 41.
[0028]
Therefore, it is possible to reduce the number of parts (parts) constituting the syringe assembly according to the third embodiment. Similarly to the above, after the injection operation, the needle sheet portion 30 and the needle 41 can be retracted into the passage 21 of the cylinder 20.
[Example 4]
[0029]
FIG. 13 shows a fourth embodiment of the disposable syringe according to the present invention having a configuration similar to the above embodiment, and the disposable syringe according to the fourth embodiment is used for a very small injection volume such as 1 ml. Is done. Therefore, the sizes of the cylinder 20, the needle sheet portion 30, the needle 41, the plunger 70, and the deformable peripheral engagement portion 60 in the fourth embodiment are each smaller than that in the above-described embodiment.
[Example 5]
[0030]
FIGS. 14 and 15 show a fifth embodiment and a sixth embodiment of the disposable syringe according to the present invention having a configuration similar to that of the third embodiment and the fourth embodiment, respectively. The difference between the third and fourth embodiments and the fifth and sixth embodiments is that the upper end 212 of the opening extends from the small diameter portion 214 of the inner peripheral wall 221 of the cylinder 20 to the surrounding end wall 219 in the X-axis direction. And the surrounding end wall 219 accommodates the through-hole 210 surrounding the X-axis. In this way, the needle 41 can pass through the through hole 210 and can protrude outward from the upper end 212 of the opening.
[Example 6]
[0031]
The sixth embodiment shown in FIG. 15 has a configuration similar to that of the fifth embodiment, but the syringe in the sixth embodiment is used for an extremely small injection volume such as 1 ml.
The preferred embodiment of the present invention has been described above, but the present invention is not limited to this embodiment, and all modifications to the present invention are within the scope of the present invention unless departing from the spirit of the present invention.
[Brief description of the drawings]
[0032]
FIG. 1 is a longitudinal sectional view of a conventional disposable syringe assembly.
FIG. 2 is an exploded perspective view of a first embodiment of a syringe according to the present invention that constitutes a syringe assembly together with a needle unit.
FIG. 3 is a perspective view of the syringe assembly according to the first embodiment.
FIG. 4 is a longitudinal sectional view of the syringe assembly according to the first embodiment in use.
FIG. 5 is a longitudinal sectional view of the syringe assembly according to the first embodiment in use.
FIG. 6 is a longitudinal sectional view of the syringe assembly according to the first embodiment in a state where the head portion of the plunger is supported by the grip portion of the needle sheet portion.
FIG. 7 is a longitudinal sectional view of the syringe assembly according to the first embodiment in a retracted state.
FIG. 8 is a longitudinal sectional view of a second embodiment of a syringe according to the present invention which constitutes a syringe assembly together with a needle unit.
FIG. 9 is a longitudinal sectional view of the syringe assembly according to the second embodiment in a state where the head portion of the plunger is supported by the grip portion of the needle sheet portion.
FIG. 10 is a longitudinal sectional view of the syringe assembly according to the second embodiment in the retracted state.
FIG. 11 is an exploded cross-sectional view in the longitudinal direction of a third embodiment of a syringe according to the present invention which constitutes a syringe assembly together with a needle unit.
FIG. 12 is a longitudinal sectional view of a syringe assembly according to a third embodiment in a retracted state.
FIG. 13 is a cutaway view in the longitudinal direction of a fourth embodiment of a syringe according to the present invention used with a needle unit.
FIG. 14 is a cutaway view in the longitudinal direction of a fifth embodiment of a syringe according to the present invention used with a needle unit.
FIG. 15 is a cutaway view in the longitudinal direction of a sixth embodiment of a syringe according to the present invention used with a needle unit.
[Explanation of symbols]
[0033]
20 Tube 21 Passage 30 Needle sheet portion 33 End portion 40 Needle unit 50, 70 Plunger 50b Head portion 53a, 73 Stem portion 60 Peripheral engagement portion 322 Lower portion 323 Upper portion

Claims

A disposable syringe for use with the needle unit (40),
An inner peripheral wall (221) having an opening lower end (211) and an opening upper end (212) opposed to each other perpendicular to the axis (X) and accommodating a passage (21) surrounding the axis (X). ) Provided with a cylinder (20),
An outer portion (501) extending outward from the lower end (211) of the opening and an inner portion (502) adjacent to the outer portion (501), and in the passage (21) of the tube (20) A movable stalk (50a, 73) and an actuated end extending from the outer portion (501) and actuated to move the stalk (50a, 73) along the passage (21). A plunger (50, 70) having (52);
Have
The inner peripheral wall (221) has a large-diameter portion (213) disposed in the vicinity of the lower end of the opening (211) and a small-diameter portion (214) disposed in the vicinity of the upper end of the opening (212), The large diameter portion (213) and the small diameter portion (214) cooperate to form a first peripheral step (215) therebetween, and
The disposable syringe has a tubular needle sheet portion (30) that is inserted into the passage (21) from the opening lower end (211) to the opening upper end (212) and is attachable to the needle unit (40). And
The tubular needle sheet portion (30) has an outer peripheral surface (333) that abuts against the large-diameter portion (213) in a hermetic manner and is arranged to abut against the first peripheral step (215). A portion (33), an upper peripheral end (321) that is vertically opposite to the lower peripheral end (33), the lower peripheral end (33), and the upper peripheral end (321). A peripheral seat wall (32) disposed between,
The peripheral sheet wall (32) includes an inner tube wall surface (324) that surrounds the shaft (X) and accommodates the duct (31), and the inner tube wall surface (324) adjacent to the lower peripheral edge (33). And a gripping portion formed in the area of the outer tube wall surface (325),
The duct (31) is formed such that its diameter gradually decreases from the lower peripheral end (33) to the upper peripheral end (321),
The grip portion is provided with a recess (326) extending inward from the inner tube wall surface (324) in the radial direction with respect to the axis X,
The outer pipe wall surface (325) is disposed in the vicinity of the lower peripheral end (33) and in the vicinity of the lower peripheral end (321) and in the vicinity of the upper peripheral end (321). An upper portion (323) opposite to
When the upper peripheral end (321) is pushed up to the upper open end (212) after the tubular needle sheet (30) is inserted into the passage, the needle sheet (30) is guided to the position in use. In this position, the lower portion (322) engages with the small diameter portion (214), and the lower peripheral end portion (33) hits the first peripheral step portion (215). (322) and the small-diameter portion (214) generate a first frictional force, whereby the lower portion (322) is held by the small-diameter portion (214) and the upper peripheral end (321). ) Resists the first frictional force, passes through the large-diameter portion (213) and is moved to the lower end of the opening (211), the needle sheet portion (30) is guided to the retracted position. In this position, the lower part (322) is Serial spaced relative to the small diameter portion (214), the lower peripheral edge (33) is spaced relative to the first peripheral step portion (215), further,
The plunger (50, 70) is inserted into a part of the holding protrusion (542) and the peripheral protrusion (541) of the inner part (502) and is held by the inner part (502) by a second frictional force. A peripheral engagement portion (60) that is slidable and slidable with respect to the large-diameter portion (213), and extends from the inner portion (502) to the grip portion of the inner tube wall surface (324). A head portion (50b),
The second friction resulting from an operation in which the actuated end (52) is pressed and the peripheral engaging portion (60) hits the lower peripheral end (33) and continues to advance to the small diameter portion (214). The peripheral engagement portion (60) is engaged with the lower peripheral end portion (33) by a third force larger than the force, the chemical solution is discharged, and then the operated end (52) is further pressed, The head portion (50b) advances to the concave portion (326) of the grip portion, and is locked in the concave portion (326) of the grip portion by a fourth friction force larger than the first friction force .
A holding groove (223) is formed in one of the lower portion (322) and the small diameter portion (214), and a holding protrusion is formed on the other of the lower portion (322) and the small diameter portion (214). When the lower portion (322) is guided to the position in use to form (327) and generate the first frictional force, the holding protrusion (327) is held in the holding groove (223) A disposable syringe characterized by being made .

The disposable syringe according to claim 1, wherein the grip portion is provided with a recess (326) extending inward from the inner tube wall surface (324) in the radial direction with respect to the axis (X). A second peripheral step portion (329) adjacent to the lower peripheral end portion (33) is formed, and peripheral protrusions (541, 741) are formed on the head portion (50b). 541, 741) are inserted into the concave portion (326) and abut against the second peripheral step portion (329), the fourth frictional force is generated, and the needle sheet portion (30) is moved to the retracted position. A supported disposable syringe.

The disposable syringe according to claim 2 , wherein the head portion (50b) extends from the peripheral protrusion (541) to two divided halves (552, 553) along the axis (X). (55), the split halves (552, 553) have upper anchor edges (554, 555), spaced apart from each other at right angles to the longitudinal direction, and each of the peripheral protrusions (541). ) When the divided halves (552, 553) arranged away from the inner tube are advanced to the upper peripheral end (321), the divided halves (552, 553) are moved closer to each other. Once deflected by the wall surface (324) and once the split half (552, 553) is advanced beyond the upper peripheral edge (321), the upper anchor edge (554, 555) is edge( Engaged in 21), disposable syringes place.

The disposable syringe according to claim 3 , wherein the diameter of the inner tube wall surface (324) gradually decreases from the lower peripheral end portion (33) to the upper peripheral end portion (321), and the spindle portion (55). ) Is gradually shortened from the peripheral protrusion (541) to the split halves (552, 553).

The disposable syringe according to claim 2 , wherein the peripheral engagement portion (60) is made of a deformable material, and has an upper end surface (64) near the lower peripheral end portion (33), and the upper surface (64). The lower end surface (65) facing the end surface (64) in the vertical direction and distant from the lower peripheral end portion (33), and disposed between the upper end surface (64) and the lower end surface (65). A disposable syringe having an outer peripheral surface (63) that is recessed toward the axis (X).

2. The disposable syringe according to claim 1, wherein the lower peripheral end portion (33) is an upper end surface that abuts against the first peripheral step portion (215) when the lower portion (322) is in the position in use. 3. (331) and a disposable syringe having a lower end surface (332) which is abutted and pushed down by the peripheral engaging portion (60).

The disposable syringe according to claim 1, wherein a spline portion (216, 328) disposed between the small diameter portion (214) and the lower portion (322) is provided, and the small diameter portion (214) and the lower portion are disposed. Disposable syringe where the relationship with the part (322) prevents rotation.

The disposable syringe according to claim 1, wherein the protruding ring (217) is formed in an inner direction and in a radial direction of the large diameter portion (214) and formed adjacent to the lower end of the opening (211). A disposable syringe, comprising a peripheral flange (51) surrounding the inner portion (502) and adjacent to the head portion (50b) and engageable with the protruding ring (217).

The disposable syringe according to claim 8 , wherein the inner portion (502) has a weakened portion (531, 731) in the vicinity of the peripheral flange (51), and the peripheral flange (51) is the protruding ring (217). ), The fragile portions (531, 731) project from the opening lower end (211) from the opening lower end (211), and the stem portions (50a, 73) are inserted into the plunger (50) at the fragile portions (531, 731). , 70), which is easy to break.

The disposable syringe according to claim 2 , wherein the inside of the peripheral protrusions (541, 741) is formed in a substantially hollow shape.

The disposable syringe according to claim 1, wherein the cylinder (20) has an outer peripheral wall (222) disposed on the opposite side of the inner peripheral wall (221), and the outer peripheral wall (222) is the upper end of the opening ( 212) has a sleeve portion (2221), and the disposable syringe further has a tip protection portion (43), and the tip protection portion (43) is formed to cover the sleeve portion (2221). A disposable syringe in which an inner sleeve end (431) is provided to protect the needle (41) of the needle unit (40).

The disposable syringe according to claim 11 , wherein a plurality of friction ribs (224, 433) are formed on the sleeve portion (2221) and the inner sleeve end (431), respectively.

13. The disposable syringe according to claim 12 , wherein the upper end of the opening (212) has a surrounding end wall (219) extending in the axial (X) direction from the small diameter portion (214) of the inner peripheral wall (221). The surrounding end wall (219) accommodates a through hole (210) surrounding the shaft (X), and the through hole (210) passes the needle (41) of the needle unit (40). Disposable syringe provided in the place.

2. The disposable syringe according to claim 1, wherein the upper portion (323) and the upper peripheral end portion (321) are arranged at the upper end of the opening (212) when the lower portion (322) is present at the position of use. The disposable syringe further includes a hub (42) and the tip protector (43), and the hub (42) holds the needle (41) of the needle unit (40). And is provided so as to cover the upper portion (323) and has a sleeve portion (423), and the tip protection portion (43) is formed to cover the sleeve portion (423). A disposable syringe provided with an inner sleeve end (431) to protect the needle (41).