JP2004329504A

JP2004329504A - Cylinder of syringe, method of manufacturing the same, and syringe needle retaining cylinder part for the cylinder

Info

Publication number: JP2004329504A
Application number: JP2003128366A
Authority: JP
Inventors: Akira Yotsutsuji; 晃四つ辻
Original assignee: KOOKI ENGINEERING KK
Current assignee: KOOKI ENGINEERING KK
Priority date: 2003-05-06
Filing date: 2003-05-06
Publication date: 2004-11-25

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin cylinder of a syringe to be easily mass-produced without complicating a structure of a mold, and capable of reducing the cost. <P>SOLUTION: In the cylinder of the syringe, an syringe needle retaining cylinder part 4, so-called lure lock, mounted on the tip side of a cylinder body 1 is formed as a separate body from the cylinder body 1, and the syringe needle retaining cylinder body 4 is forced and fixed into a projection 3, 31 or 32 formed around a nozzle part 2 on the base end side. Accordingly, the cylinder A of the syringe with the integrated syringe needle retaining cylinder part 4 to safely attach/detach a syringe needle can be mass-produced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、射出成形法でポリカーボネートのようなエンジニアリング・プラスチックなどから成形されるルアーロック装着型注射器のシリンダ及びその製造方法並びに該シリンダに使用される注射針抜け止め用筒部に関する。
【０００２】
【従来の技術】
従来の注射器のシリンダの先端面には、その外径が先端に向かうにつれて小径化するテーパー状の注射針装着用のノズル部が突設されており、使用する際には、このノズル部を注射針の装着用基部に差し込んで装着するようになっている。しかしながら、前記ノズル部への装着は単なる差し込みであったため取り扱い中に注射針が不用意に抜けたりして指に刺さるというような事故があった。
【０００３】
そこで、前記のようにノズル部に差し込んである注射針が使用時に不用意に抜けたりするのを防止するため、最近のシリンダとして、図１３に示すように、シリンダ本体（１０１）の先端面（１０１ａ）に突設されたノズル部（１０２）を取り囲む位置に、内周面（１０３ａ）に注射針（Ｍ）の装着基部（Ｍａ）の外鍔（Ｍｂ）に螺合するネジ部（１０４）が一体的に形成された注射針抜け止め用筒部（１０３）を設けたものが知られている。そのような従来例として特開２０００−２７１２２１がある。
【０００４】
ところで、このようなルアーロック一体型注射器のシリンダ（１００）は、周知のように射出用成形金型で成形される。この成形金型は、例えば図１４、１５に示すように、雄型（２０１）と、雄型（２０１）に突設されてシリンダ（１００）の内周面を形成するための凸部（２０２）と、この凸部（２０２）に外嵌されて前記雄型（２０１）に摺動可能に配設された突き出しプレート（２０３）と、前記雄型（２０１）に対向して配設され、且つシリンダ（１００）の外周面を形成するための凹部（２０５）を有する雌型（２０４）とを備え、前記凸部（２０２）の先端には、ノズル部（１０２）の内周面を形成するための先細り状のピン部（２０６）が一体形成され、凹部（２０５）の底面には、ピン部（２０６）に同軸状に位置する筒孔部（２０８）が形成されており、この筒孔部（２０８）には、ピン部（２０６）と同軸上に位置して注射針抜け止め用筒部（１０３）を形成するためのコア（２０７）が配備されている。
【０００５】
前記凸部（２０２）と凹部（２０５）との間、ピン部（２０６）の外周面とコア（２０７）の内周面との間、さらにはコア（２０７）の外周面と筒孔部（２０８）の内周面との間でキャビティ（ＣＶ）が構成されており、射出機（１１０）からの溶融樹脂（Ｎ）を金型におけるランナー（ＲＮ）、ゲート（ＧＴ）を通してキャビティ（ＣＶ）内に注入・充填させ、溶融樹脂（Ｎ）を固化させてシリンダ（１００）を成形する。
【０００６】
然る後、シリンダ（１００）の取り出しが行われるのであるが、図１５から分るようにルアーロック一体型シリンダ（１００）の注射針抜け止め用筒部（１０３）の内周面（１０３ａ）に螺旋状のネジ部（１０４）が形成されているため、型開に先立ってコア（２０７）をモータ（１１１）にてねじ戻して筒孔部（２０８）から抜き去り、然る後、型を開き、突き出しプレート（２０３）でシリンダ（１００）を雄型（２０１）から押し出し、シリンダ（１００）の不要部分を除去することにより、注射器のルアーロック一体型シリンダ（１００）が形成される。
【０００７】
上記のように従来の注射器のルアーロック一体型シリンダ（１００）では、注射針抜け止め用筒部（１０３）がシリンダ本体（１０１）に一体形成されているので、シリンダ成形用金型（Ｋ）には、該注射針抜け止め用筒部（１０３）を成形するためのコア（２０７）が必要である。この種のシリンダ（１００）は、図１３に示すように上記金型（Ｋ）により多数個取りするのが通例であり、それによって前記コア（２０７）の数も多くなると、雌型（２０４）に多くのコア（２０７）を同期して正逆回転・進退可能に組み付ける必要があり、金型構造が非常に複雑になるのでコスト高を招くだけでなく、結果的にコア（２０７）の数も少数に制限されることになる。
【０００８】
【発明が解決しようとする課題】
本発明は、上記実情に鑑みてなされたものであり、金型構造の複雑化を招くことなく多数個取りが容易に行え、コストの低減を図ることができる注射器のシリンダとその製造方法を提供することを第１の目的とし、更には注射針抜け止め用筒部の射出成形にあたって、ネジ部を形成するコアの正逆回転・進退構造も不要とすることができるような注射針抜け止め用筒部の提供を第２の目的とする。
【０００９】
【課題を解決するための手段】
「請求項１」に記載のルアーロック装着型注射器のシリンダ（Ｈ）は、「シリンダ本体（１）の先端面（１ａ）に突設されたノズル部（２）を取り囲む位置に注射針抜け止め用筒部（４）を設けてある注射器のシリンダ（Ｈ）であって、シリンダ本体（１）とは別体形成して内周面（４ａ）に注射針（Ｍ）の装着基部（Ｍａ）が螺合されるネジ部（５）が形成された注射針抜け止め用筒部（４）が、ノズル部（２）の基端側周りに一体形成された凸部（３）に圧入・固定されている」ことを特徴とする。
【００１０】
本発明の注射器のシリンダ（Ｈ）によれば、シリンダ本体（１）の先端側に設けられる注射針抜け止め用筒部（４）を該シリンダ本体（１）とは別体に成形し、この注射針抜け止め用筒体（４）を凸部（３）に圧入・固定するようにしたので、シリンダ本体（１）を樹脂成形する際の成形金型に注射針抜け止め用筒体用のコア（２４）を組み付ける必要がなく、金型構造が簡素化され、従来のコア付き金型（Ｋ）と比較して何倍もの多数個取りが可能となり、極めて容易に量産化及び低コスト化を図ることができる。
【００１１】
「請求項２」は「請求項１」の注射器のシリンダ（Ｈ）に使用される注射針抜け止め用筒部（４）であって、「少なくともネジ部（５）を形成する側壁部分（５ａ）に軸方向に沿って薄肉部（５ｂ）又は切欠溝（５ｃ）が形成されている」ことを特徴とするもので、薄肉部（５ｂ）又は切欠溝（５ｃ）の存在により、コア（２４）をネジ部（５）から引き抜く際、コア（２４）の山部（２５）がネジ部（５）のねじ山（５ｄ）を通過する時に、薄肉部（５ｂ）が僅かに引き伸ばされたり、切欠溝（５ｃ）の溝幅が広がってネジ部（５）が拡径し、コア（２４）をネジ回すことなく注射針抜け止め用筒部（４）の軸方向に引き抜くだけでコア（２４）をネジ部（５）から引き抜くことができ、図１５に示すような複雑なコアネジ回し機構を用意する必要がない。従って、金型構造が大幅に簡素化され、従来に比べて遥かに多くの注射針抜け止め用筒部（４）の多数個取りが低コストで可能となる。
【００１２】
「請求項３」は前記注射器のシリンダ（Ｈ）の製造方法に関し、「先端面（１ａ）に突設されたノズル部（２）と、前記ノズル部（２）の基端側周りに凸部（３）が一体形成されているシリンダ本体（１）と、内周面（４ａ）に注射針（Ｍ）の装着基部（Ｍａ）が螺合されるネジ部（５）が形成された注射針抜け止め用筒部（４）とをそれぞれ別個成形し、次いで、前記注射針抜け止め用筒部（４）をノズル部（２）に外嵌してノズル部（２）の基端側周りに形成されている凸部（３）に前記注射針抜け止め用筒体（４）を圧入・固定する」ことを特徴とする。
【００１３】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づいて説明する。図１は、本発明の一実施形態にかかる注射器のシリンダ（Ｈ）を示す分解斜視図、図２は、同じく注射器のシリンダ（Ｈ）を示す組立状態の断面図である。（１）は、ポリプロピレン（ＰＰ）、ポリカーボネート樹脂（ＰＣ）、メチルメタアクリレート樹脂（ＰＭＭＡ）、ポリエーテルサルホン（ＰＥＳ）、ノルボルネン−オレフィン共重合体（ＣＯＣ）、ノルボルネン開環重合体［水素添加品］（ＣＯＰ、ポリフェニレンオキサイド；ＰＰＯ、ポリスルホン；ＰＳＦ、ポリフェニレンスルフィド；ＰＰＳ）などからなる筒形のシリンダ本体であり、このシリンダ本体（１）の先端面（１ａ）には、中空部が薬液通流孔（２ａ）として構成され、且つその外径が先端に向かうにつれて次第に小径化するノズル部（２）が一体形成されている。
【００１４】
このノズル部（２）には、使用時に注射針（Ｍ）の装着基部（Ｍａ）が装着される。なお、シリンダ本体（１）の基端外周には、注射時の指当て用の鍔部（１ｂ）が形成されている。前記ノズル部（２）の基部側の周りには、図４にも示すように、凸部（３）が一体形成されており、この場合、その正面形状が４角形である。
【００１５】
（４）は前記シリンダ本体（１）とは別体に成形された注射針抜け止め用筒体であり、この注射針抜け止め用筒体（４）の内周面（４ａ）には、前記注射針（Ｍ）の装着基部（Ｍａ）に形成されている外鍔（Ｍｂ）に螺合するネジ部（５）が形成されている。注射針抜け止め用筒体（４）は図１に示すように円筒形のものでもよいが、図７〜１１に示すように少なくともネジ部（５）を形成する側壁部分（５ａ）に軸方向に沿って薄肉部（５ｂ）又は切欠溝（５ｃ）を形成してもよい。図１に示すように円筒形の場合、注射針抜け止め用筒体（４）のネジ部（５）を形成するコア（２４）はネジ部（５）のねじ山（５ｄ）に沿って螺旋回転させなければならず、図１５に示すような複雑なコアネジ回し機構が必要となる。従って、注射針抜け止め用筒体（４）の取り数はおのずとの小さい値に制限される。
【００１６】
一方、薄肉部（５ｂ）又は切欠溝（５ｃ）を少なくともネジ部（５）に形成した場合、前述のようにコア（２４）をネジ部（５）から引き抜く際、コア（２４）の山部（２５）がネジ部（５）のねじ山（５ｄ）を通過する時に、薄肉部（５ｂ）が僅かに引き伸ばされたり、切欠溝（５ｃ）の溝幅が広がってネジ部（５）が拡径し、コア（２４）をネジ回すことなく注射針抜け止め用筒部（４）の軸方向に引き抜くだけでコア（２４）をネジ部（５）から引き抜くことができ、コアネジ回し機構を用意する必要がない。したがって、金型構造が大幅に簡素化され、従来に比べて遥かに多くの注射針抜け止め用筒部（４）の多数個取りが低コストで可能となる。
【００１７】
薄肉部（５ｂ）又は切欠溝（５ｃ）は図１１のようにネジ部（５）を構成する側壁部分（５ａ）だけでもよいが、図９に示すように、注射針抜け止め用筒体（４）の全長にわたって形成してもよい。前者の場合、コア（２４）の引き抜きに必要なネジ部（５）だけに薄肉部（５ｂ）又は切欠溝（５ｃ）が形成され、シリンダ本体（１）の凸部（３）への圧入圧力が減少しないので好ましい。
【００１８】
薄肉部（５ｂ）は図８に示すように側壁部分（５ａ）に半円形の凹溝（５ｂ２）やスリット状の凹溝（５ｂ１）などを凹設するによって形成される。勿論、凹溝の形状は問わない。切欠溝（５ｃ）はネジ部（５）において、側壁部分（５ａ）の内外に貫通するように形成される（図１１）。なお、注射針抜け止め用筒体（４）も例えばポリカーボネート樹脂から構成されている。ポリカーボネート樹脂のような硬い材料でも薄肉部（５ｂ）又は切欠溝（５ｃ）を設けておけば、前述のようにコア（２４）をネジ回すことなく注射針抜け止め用筒部（４）の軸方向に引き抜くことができる。
【００１９】
前記注射針抜け止め用筒体（４）の基端部（４ｂ）の円錐状の開口端面（４ｃ）は、図３にも示すように、先端側に向かって凹入する円錐壁面として構成されており、この円錐壁面（４ｃ）の中央には、前記凸部（３）の外形寸法（対角線）よりも僅かに小径で、該凸部（３）に圧入される円形の圧入孔（６）が基端開口として形成されている。
【００２０】
つまり、上記構成において、シリンダ組立時には、注射針抜け止め用筒体（４）の基端部（４ｂ）側をシリンダ本体（１）のノズル部（２）に向けて挿入しながらシリンダ本体（１）の先端側の凸部（３）に対して、図２に示すように、注射針抜け止め用筒体（４）における圧入孔（６）に圧入させれば、該注射針抜け止め用筒体（４）が前記ノズル部（２）を取り囲む位置でシリンダ本体（１）の先端面（１ａ）側に装着される。
【００２１】
この注射針抜け止め用筒体（４）の装着操作時に、前記圧入孔（６）に対して円錐壁面（４ｃ）が凸部（３）までのガイドとして作用するから装着操作がスムーズに行える。前記注射針抜け止め用筒体（４）における圧入孔（６）の形状は円形に限らないが、この例のように、凸部（３）の平面形状が４角形であるのに対して、圧入孔（６）の形状を円形にしてあると、この圧入孔（６）を凸部（３）に圧入した際に、占部（３）の角部（３ａ）と圧入孔（６）の内周面との聞での単位面積当たりの接触圧が高く、注射針抜け止め用筒体（４）の堅固な固定が達成される。
【００２２】
一方、注射器使用時においては、注射針（Ｍ）の装着基部（Ｍａ）の外鍔（Ｍｂ）を前記注射針抜け止め用筒体（４）の内周面（４ａ）のネジ部（５）に回転させつつ螺入させることにより、該注射針（Ｍ）の装着基部（Ｍａ）が前記ノズル部（２）に差し込まれ、水密状に装着される。このため、使用時に注射針（Ｍ）が不用意に前記ノズル部（２）から外れるのが前記注射針抜け止め用筒体（４）により防止される。
【００２３】
外鍔（Ｍｂ）とネジ部（５）との関係を簡単に述べると、装着時、ノズル部（２）に対して装着基部（Ｍａ）は同軸に嵌め込まれる。従って、外鍔（Ｍｂ）はノズル部（２）に対して直角となっている。これに対してネジ部（５）は螺旋状に切られているので、ノズル部（２）に対して若干傾斜している。従って、外鍔（Ｍｂ）がネジ部（５）をスムーズに移動していくには、外鍔（Ｍｂ）が通過するねじの谷部の溝幅が外鍔（Ｍｂ）より大きく、外鍔（Ｍｂ）の上・下面のいずれかの点でネジ部（５）の摺接面のいずれかの点に接するようになっている。
【００２４】
ここで、注射針抜け止め用筒体（４）と前記シリンダ本体（１）とが別体に形成されているので、この注射針抜け止め用筒体（４）自体も容易に成形できる他、シリンダ本体（１）についても、従来のような成形金型におけるコアを設ける必要がなくなり、金型組み付けの手間も少なくなる。従って、コア付き金型に比べて簡単な金型構造となり、これにより何倍もの多数個取りが可能となり、低コストで注射器用シリンダを提供することができる。
【００２５】
また、注射針抜け止め用筒体（４）とシリンダ本体（１）とが別体成形であることから、例えば注射針抜け止め用筒体（４）の形状変更などがあれば、シリンダ本体（１）の成形金型などをそのままにして、迅速、且つ容易に対応することができる。
【００２６】
なお、前記シリンダ本体（１）に形成されて注射針抜け止め用筒体（４）が圧入される凸部（３）は、上記のように正面形状が４角形のものに限られるものではなく、正面形状が例えば３角形、あるいは図５に示すように、多角形のもの、図示していないが円形、楕円形であってもよく、また、凸部（３）をノズル部（２）周りに連続した形態で形成した（３１）で示すようなものに限らず、例えば図６に示すように、ノズル部（２）周りに等配した複数の凸部（３２）で構成したものなど、注射針抜け止め用筒体（４）を圧入・固定できるものであればよい。また、圧入孔（６）も前記凸部（３）の角が圧入時に圧入孔（６）の内周面に食い込むような形状のもの、例えば円形のようなものであってもよいし、前記凸部（３）と同じで面接触するようにしてもよい。
【００２７】
【発明の効果】
以上のように、本発明によれば、シリンダ本体の先端側に設けられる注射針抜け止め用筒部を該シリンダ本体とは別体に成形し、この注射針抜け止め用筒部をノズル基端側周りに設けた凸部に圧入・固定するようにしたので、シリンダ本体を樹脂成形する際の金型にコアなどが不要となり、一つの成形金型によるシリンダの多数個取りが容易に実行でき、もって製作費を大幅に削減することができる。
【００２８】
更に薄肉部又は切欠溝を設けておけば、コアをネジ回すことなく注射針抜け止め用筒部の軸方向に引き抜くだけでコアをネジ部から引き抜くことができ、したがって、金型構造が大幅に簡素化され、従来に比べて遥かに多くの注射針抜け止め用筒部の多数個取りが低コストで可能となる。
【図面の簡単な説明】
【図１】本発明の実施形態にかかる注射器のシリンダを示す分解斜視図
【図２】同じく注射器のシリンダを示す組立状態の断面図
【図３】図１のＩＩＩ−ＩＩＩ線に沿った断面図
【図４】図２のＩＶ−ＩＶ線に沿った断面図
【図５】本発明の凸部の変形例の説明図
【図６】本発明の凸部の別の変形例の説明図
【図７】本発明の注射針抜け止め用筒部の他の実施例の正面図
【図８】本発明の注射針抜け止め用筒部の更に他の実施例の正面図
【図９】図７又は８のＶ−Ｖ又はＶＩ−ＶＩ線に沿った断面図
【図１０】本発明の注射針抜け止め用筒部の更に他の実施例の正面図
【図１１】図１０のＶＩＩ−ＶＩＩ線に沿った断面図
【図１２】図７〜１１に示す注射針抜け止め用筒部からのコアの引き抜き状態を示す要部拡大断面図
【図１３】従来の注射器のシリンダを示す断面図
【図１４】従来の注射器のシリンダの成形金型を示す断面図
【図１５】図１４の成形金型全体の断面図
【符号の説明】
（１）シリンダ本体
（１ａ）シリンダ本体の先端面
（２）ノズル部
（３）（３１）（３２）凸部
（４）注射針抜け止め用筒体（ルアーロック）
（４ａ）注射針抜け止め用機体の内周面
（４ｂ）注射針抜け止め用筒体の基端部
（５）ネジ部
（６）圧入孔
（Ｍ）注射針
（Ｍａ）注射針の基部
（Ｍｂ）外鍔[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cylinder of a luer lock type syringe molded from engineering plastics such as polycarbonate by injection molding, a method of manufacturing the same, and a syringe needle retaining cylinder used in the cylinder.
[0002]
[Prior art]
The distal end surface of the cylinder of a conventional syringe is provided with a tapered injection needle mounting nozzle portion whose outer diameter decreases as it goes toward the distal end, and when used, this nozzle portion is injected. It is designed to be inserted into the base for mounting the needle. However, since the attachment to the nozzle portion was merely insertion, there was an accident such that the injection needle was accidentally pulled out during handling and stuck on a finger.
[0003]
Therefore, in order to prevent the injection needle inserted into the nozzle portion from being accidentally pulled out at the time of use as described above, as a recent cylinder, as shown in FIG. At the position surrounding the nozzle portion (102) protrudingly provided at 101a), a screw portion (104) screwed to the outer flange (Mb) of the mounting base (Ma) of the mounting needle (Ma) of the injection needle (M) on the inner peripheral surface (103a). Is known in which an injection needle stopper cylinder (103) integrally formed is provided. Japanese Patent Application Laid-Open No. 2000-271221 is one such conventional example.
[0004]
Incidentally, the cylinder (100) of such a Luer lock-integrated syringe is formed by an injection molding die as is well known. As shown in FIGS. 14 and 15, for example, this molding die has a male mold (201) and a projection (202) projecting from the male mold (201) to form the inner peripheral surface of the cylinder (100). ), A protruding plate (203) which is externally fitted to the convex portion (202) and slidably disposed on the male die (201), and is disposed facing the male die (201); And a female mold (204) having a concave portion (205) for forming the outer peripheral surface of the cylinder (100), and the inner peripheral surface of the nozzle portion (102) is formed at the tip of the convex portion (202). A tapered pin portion (206) is formed integrally, and a cylindrical hole (208) is formed on the bottom surface of the concave portion (205) so as to be coaxial with the pin portion (206). The hole (208) is located coaxially with the pin (206) and is used to prevent a needle from falling out. Core for forming a part (103) (207) is deployed.
[0005]
Between the convex portion (202) and the concave portion (205), between the outer peripheral surface of the pin portion (206) and the inner peripheral surface of the core (207), and further, between the outer peripheral surface of the core (207) and the cylindrical hole ( A cavity (CV) is formed between the cavity (CV) and the inner peripheral surface of the mold (208), and the molten resin (N) from the injection machine (110) is passed through a runner (RN) and a gate (GT) in a mold. The molten resin (N) is solidified to form a cylinder (100).
[0006]
After that, the cylinder (100) is taken out. As can be seen from FIG. 15, the inner peripheral surface (103a) of the injection needle retaining cylinder portion (103) of the luer lock integrated cylinder (100). Since the spiral screw portion (104) is formed on the core (207), the core (207) is unscrewed by the motor (111) and removed from the cylindrical hole (208) prior to opening the mold. Is opened, the cylinder (100) is pushed out of the male mold (201) by the ejection plate (203), and an unnecessary portion of the cylinder (100) is removed, thereby forming the luer lock integrated cylinder (100) of the syringe.
[0007]
As described above, in the conventional luer lock-integrated cylinder (100) of the syringe, the cylinder part (103) for retaining the injection needle is formed integrally with the cylinder body (101), so the cylinder molding die (K). Requires a core (207) for forming the injection needle retaining tube (103). As shown in FIG. 13, a large number of such cylinders (100) are usually taken by the mold (K), and when the number of the cores (207) increases, the female mold (204) is formed. It is necessary to assemble a large number of cores (207) so as to be able to rotate forward / reverse and move forward / backward in synchronization with each other, so that the mold structure becomes very complicated, which not only increases the cost but also results in the number of cores (207). Will also be limited to a small number.
[0008]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and provides a cylinder for a syringe and a method of manufacturing the same, which can easily perform multi-piece picking without incurring complicated mold structure and can reduce cost. A first object of the present invention is to prevent the injection needle from coming off, and furthermore, it is possible to eliminate the necessity of the forward / reverse rotation / advance / retreat structure of the core forming the screw part in the injection molding of the injection needle retaining cylinder. A second purpose is to provide a cylindrical portion.
[0009]
[Means for Solving the Problems]
The cylinder (H) of the luer lock-equipped syringe described in “Claim 1” is “a syringe needle stopper at a position surrounding the nozzle portion (2) protruding from the tip end surface (1a) of the cylinder body (1)”. A cylinder (H) of a syringe provided with a use cylinder (4), which is formed separately from the cylinder body (1) and has a mounting base (Ma) for mounting an injection needle (M) on an inner peripheral surface (4a). The injection needle retaining cylinder part (4) formed with the screw part (5) into which the thread is screwed is press-fitted and fixed to the convex part (3) integrally formed around the base end side of the nozzle part (2). Has been done. "
[0010]
According to the cylinder (H) of the syringe of the present invention, the injection needle retaining cylinder (4) provided on the tip side of the cylinder main body (1) is formed separately from the cylinder main body (1). The cylinder (4) for retaining the injection needle is press-fitted and fixed to the convex portion (3), so that the cylinder for retaining the injection needle is provided in a molding die when the cylinder body (1) is molded with resin. There is no need to assemble the core (24), the mold structure is simplified, the number of multiples can be taken many times as compared with the conventional cored mold (K), and mass production and cost reduction are extremely easy. Can be achieved.
[0011]
"Claim 2" is a cylinder part (4) for retaining the injection needle used for the cylinder (H) of the syringe according to "Claim 1", and "at least a side wall part (5a) forming a screw part (5)". ), A thin portion (5b) or a notched groove (5c) is formed along the axial direction ”. The core (24) is formed by the presence of the thin portion (5b) or the notched groove (5c). ) Is pulled out from the screw portion (5), when the crest (25) of the core (24) passes through the thread (5d) of the screw portion (5), the thin portion (5b) is slightly stretched, The groove width of the notch groove (5c) is widened and the diameter of the screw portion (5) is increased, and the core (24) is simply pulled out in the axial direction of the syringe needle retaining tube (4) without turning the core (24). ) Can be pulled out from the screw part (5), and a complicated core screwdriver mechanism as shown in FIG. 15 is prepared. There is no need. Therefore, the mold structure is greatly simplified, and it is possible to obtain a large number of injection needle retaining cylinders (4) at a lower cost than ever before.
[0012]
Claim 3 relates to a method of manufacturing the cylinder (H) of the syringe, wherein "a nozzle portion (2) protruding from a distal end surface (1a) and a convex portion around a base end side of the nozzle portion (2)". A cylinder body (1) integrally formed with (3), and an injection needle formed with a screw portion (5) on an inner peripheral surface (4a) to which a mounting base (Ma) of the injection needle (M) is screwed. The retaining cylinder (4) is separately molded, and then the injection needle retaining cylinder (4) is fitted around the nozzle (2) so as to surround the proximal end of the nozzle (2). The injection needle retaining cylinder (4) is press-fitted and fixed to the formed projection (3). "
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a cylinder (H) of a syringe according to an embodiment of the present invention, and FIG. 2 is a sectional view of the assembled state showing the cylinder (H) of the syringe. (1) is polypropylene (PP), polycarbonate resin (PC), methyl methacrylate resin (PMMA), polyethersulfone (PES), norbornene-olefin copolymer (COC), norbornene ring-opening polymer [hydrogenated Article] (COP, polyphenylene oxide; PPO, polysulfone; PSF, polyphenylene sulfide; PPS) and the like. A hollow cylinder is formed at the tip surface (1a) of the cylinder body (1). A nozzle portion (2) which is configured as a flow hole (2a) and whose outer diameter gradually decreases as it goes toward the tip is integrally formed.
[0014]
At the time of use, a mounting base (Ma) of the injection needle (M) is mounted on the nozzle portion (2). A flange (1b) for finger contact at the time of injection is formed on the outer periphery of the base end of the cylinder body (1). As shown in FIG. 4, a convex portion (3) is integrally formed around the base side of the nozzle portion (2), and in this case, the front shape is a quadrangle.
[0015]
(4) is an injection needle retaining cylinder formed separately from the cylinder body (1), and the inner peripheral surface (4a) of the injection needle retaining cylinder (4) is A screw portion (5) is formed which is screwed to an outer flange (Mb) formed on the mounting base (Ma) of the injection needle (M). The cylindrical body (4) for retaining the injection needle may be cylindrical as shown in FIG. 1, but as shown in FIGS. 7 to 11, at least a side wall part (5a) forming the screw part (5) is formed in the axial direction. A thin portion (5b) or a notched groove (5c) may be formed along the line. As shown in FIG. 1, in the case of a cylindrical shape, the core (24) forming the screw portion (5) of the syringe needle retaining tube (4) spirals along the thread (5d) of the screw portion (5). It must be rotated, and requires a complicated core screwdriver as shown in FIG. Therefore, the number of the syringe needle retaining cylinders (4) is naturally limited to a small value.
[0016]
On the other hand, when the thin portion (5b) or the notch groove (5c) is formed in at least the screw portion (5), when the core (24) is pulled out from the screw portion (5) as described above, the crest portion of the core (24) is formed. When (25) passes through the thread (5d) of the screw portion (5), the thin portion (5b) is slightly stretched, or the groove width of the notch groove (5c) is widened and the screw portion (5) is expanded. The core (24) can be pulled out from the screw (5) simply by pulling out the diameter of the core (24) in the axial direction of the syringe needle retaining tube (4) without screwing, and a core screwing mechanism is prepared. No need to do. Therefore, the mold structure is greatly simplified, and a large number of injection needle retaining cylinders (4) can be formed at a lower cost than ever before.
[0017]
The thin part (5b) or the notch groove (5c) may be only the side wall part (5a) constituting the screw part (5) as shown in FIG. 11, but as shown in FIG. It may be formed over the entire length of 4). In the former case, the thin portion (5b) or the notch groove (5c) is formed only in the screw portion (5) necessary for pulling out the core (24), and the press-fitting pressure into the convex portion (3) of the cylinder body (1). Is not preferred.
[0018]
The thin portion (5b) is formed by forming a semicircular groove (5b2) or a slit-shaped groove (5b1) in the side wall (5a) as shown in FIG. Of course, the shape of the concave groove does not matter. The cutout groove (5c) is formed in the screw portion (5) so as to penetrate into and out of the side wall portion (5a) (FIG. 11). In addition, the syringe needle retaining cylinder (4) is also made of, for example, polycarbonate resin. If a thin portion (5b) or a cutout groove (5c) is provided in a hard material such as a polycarbonate resin, the shaft of the syringe needle retaining barrel (4) can be formed without screwing the core (24) as described above. Can be pulled in any direction.
[0019]
The conical opening end surface (4c) of the base end portion (4b) of the syringe needle retaining cylinder (4) is formed as a conical wall surface that is recessed toward the distal end side as shown in FIG. In the center of the conical wall surface (4c), a circular press-fit hole (6) having a diameter slightly smaller than the outer dimension (diagonal line) of the convex portion (3) and press-fit into the convex portion (3). Are formed as proximal openings.
[0020]
That is, in the above configuration, when assembling the cylinder, the cylinder body (1) is inserted while inserting the base end (4b) side of the syringe needle retaining cylinder (4) toward the nozzle portion (2) of the cylinder body (1). As shown in FIG. 2, the protrusion (3) on the tip side of the injection needle is press-fitted into the press-in hole (6) of the cylinder (4) for retaining the injection needle. The body (4) is attached to the distal end surface (1a) of the cylinder body (1) at a position surrounding the nozzle portion (2).
[0021]
During the mounting operation of the syringe needle retaining cylinder (4), the mounting operation can be performed smoothly because the conical wall surface (4c) acts as a guide to the convex portion (3) with respect to the press-fit hole (6). The shape of the press-fit hole (6) in the syringe needle retaining cylinder (4) is not limited to a circle, but as in this example, the planar shape of the projection (3) is a quadrangle. If the shape of the press-fitting hole (6) is circular, when the press-fitting hole (6) is press-fitted into the convex part (3), the corner (3a) of the occupant portion (3) and the press-fitting hole (6) are formed. The contact pressure per unit area with the inner peripheral surface is high, and the injection needle retaining cylinder (4) is firmly fixed.
[0022]
On the other hand, when the syringe is used, the outer flange (Mb) of the mounting base (Ma) of the injection needle (M) is connected to the threaded portion (5) of the inner peripheral surface (4a) of the syringe needle retaining tube (4). By inserting the injection needle (M) into the nozzle part (2) by screwing it into the nozzle part (2), it is mounted in a watertight manner. Therefore, the syringe needle (M) is prevented from being accidentally detached from the nozzle portion (2) during use by the syringe needle retaining cylinder (4).
[0023]
Briefly describing the relationship between the outer flange (Mb) and the screw portion (5), the mounting base (Ma) is fitted coaxially with the nozzle portion (2) during mounting. Therefore, the outer flange (Mb) is perpendicular to the nozzle portion (2). On the other hand, since the screw portion (5) is spirally cut, it is slightly inclined with respect to the nozzle portion (2). Therefore, in order for the outer collar (Mb) to move smoothly through the threaded portion (5), the groove width of the root of the screw through which the outer collar (Mb) passes is larger than the outer collar (Mb), and Mb) comes into contact with any point on the sliding contact surface of the screw portion (5) at any point on the upper or lower surface.
[0024]
Here, since the injection needle retaining cylinder (4) and the cylinder body (1) are formed separately, the injection needle retaining cylinder (4) itself can be easily formed. Also for the cylinder body (1), there is no need to provide a core in a molding die as in the related art, and the labor for assembling the die is reduced. Therefore, the mold structure is simpler than that of a mold with a core, which makes it possible to take many times as many pieces, and to provide a syringe cylinder at low cost.
[0025]
Further, since the injection needle retaining cylinder (4) and the cylinder body (1) are formed separately, if there is a change in the shape of the injection needle retaining cylinder (4), for example, the cylinder body ( It is possible to respond quickly and easily while keeping the molding die and the like of 1).
[0026]
The protrusion (3) formed on the cylinder body (1) and into which the injection needle retaining cylinder (4) is press-fitted is not limited to the one having a square front shape as described above. The front shape may be, for example, a triangle or, as shown in FIG. 5, a polygonal shape, not shown, a circular shape or an elliptical shape, and the convex portion (3) may be formed around the nozzle portion (2). It is not limited to the one shown in (31) formed in a continuous form, and for example, as shown in FIG. 6, one formed by a plurality of projections (32) equally distributed around the nozzle part (2), What is necessary is just to be able to press-fit and fix the injection needle retaining cylinder (4). Also, the press-fit hole (6) may have a shape such that the corner of the convex portion (3) bites into the inner peripheral surface of the press-fit hole (6) at the time of press-fitting, for example, a circular shape. You may make it surface-contact like the convex part (3).
[0027]
【The invention's effect】
As described above, according to the present invention, the injection needle retaining cylinder provided on the distal end side of the cylinder main body is formed separately from the cylinder main body, and the injection needle retaining cylinder is provided at the nozzle base end. Pressing into and fixing to the protrusions provided around the sides eliminates the need for a core or the like in the mold when molding the cylinder body with resin. Therefore, the production cost can be greatly reduced.
[0028]
Furthermore, if a thin portion or a notch groove is provided, the core can be pulled out from the screw portion only by pulling out the injection needle retaining tube portion in the axial direction without screwing the core, so that the mold structure is significantly reduced. It is simplified, and it is possible to obtain a large number of cylinders for retaining the injection needle much more at low cost than in the past.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a cylinder of a syringe according to an embodiment of the present invention. FIG. 2 is a sectional view of the assembled state showing the cylinder of the syringe. FIG. 3 is a sectional view taken along line III-III of FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2; FIG. 5 is an explanatory view of a modified example of the convex portion of the present invention; FIG. 6 is an explanatory view of another modified example of the convex portion of the present invention; 7 is a front view of another embodiment of the injection needle retaining cylinder of the present invention. FIG. 8 is a front view of still another embodiment of the injection needle retaining cylinder of the present invention. FIG. 9 or FIG. 8 is a sectional view taken along the line VV or VI-VI of FIG. 10; FIG. 10 is a front view of still another embodiment of the barrel for retaining the injection needle of the present invention. FIG. 11 is a view taken along the line VII-VII of FIG. FIG. 12 is an enlarged sectional view of a main part showing a state in which the core is pulled out from the injection needle retaining tube shown in FIGS. 7 to 11; FIG. Cross-sectional view showing the cylinder vessels 14 is a sectional view showing a molding die of a conventional syringe cylinder Figure 15 is a cross-sectional view of the entire molding die 14 EXPLANATION OF REFERENCE NUMERALS
(1) Cylinder body (1a) Tip surface of cylinder body (2) Nozzle part (3) (31) (32) Convex part (4) Injection needle retaining cylinder (Luer lock)
(4a) Inner peripheral surface of injection needle retaining body (4b) Base end of injection needle retaining cylinder (5) Screw (6) Press-in hole (M) Injection needle (Ma) Injection needle base ( Mb) Outer tsuba

Claims

A cylinder of a syringe provided with a syringe needle retaining tube portion at a position surrounding a nozzle portion protruding from a distal end surface of a cylinder body,
A barrel portion for forming the injection needle which is formed separately from the cylinder body and on which the screw portion to which the mounting base portion of the injection needle is screwed is formed on the inner peripheral surface thereof is integrally formed around the base end side of the nozzle portion. A syringe cylinder characterized by being press-fitted and fixed to a convex portion.

A syringe needle retaining cylinder used for the cylinder of the syringe according to claim 1,
A thin portion or a notched groove is formed in at least a side wall portion forming a screw portion along an axial direction, so as to prevent the injection needle from coming off.

A nozzle portion protruding from the distal end surface, a cylinder body in which a convex portion is integrally formed around the base end side of the nozzle portion, and a screw portion on the inner peripheral surface to which the mounting base of the injection needle is screwed are formed. The injection needle retaining tube portion is separately molded, and then the injection needle retaining tube portion is fitted over the nozzle portion to form a convex portion formed around the base end side of the nozzle portion. A method for manufacturing a cylinder, comprising press-fitting and fixing a cylinder for retaining a syringe needle.