JP2004267323A - Indwelling needle assembly - Google Patents

Indwelling needle assembly Download PDF

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Publication number
JP2004267323A
JP2004267323A JP2003059619A JP2003059619A JP2004267323A JP 2004267323 A JP2004267323 A JP 2004267323A JP 2003059619 A JP2003059619 A JP 2003059619A JP 2003059619 A JP2003059619 A JP 2003059619A JP 2004267323 A JP2004267323 A JP 2004267323A
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Japan
Prior art keywords
needle
indwelling
tip
hub
distal end
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JP2003059619A
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Japanese (ja)
Inventor
Hiroyuki Nakagami
裕之 中神
Kazuyoshi Harada
和良 原田
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Nipro Corp
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Nipro Corp
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Priority to JP2003059619A priority Critical patent/JP2004267323A/en
Publication of JP2004267323A publication Critical patent/JP2004267323A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an indwelling needle assembly capable of surely fixing an external needle and an internal needle to each other at the time of introduction to a patient and capable of being used as it is while a conventional transfusion line, or the like, is connected thereto. <P>SOLUTION: This indwelling needle assembly comprises: the external needle 2 to be detained in biological tissues; an external needle hub 3 where the external needle 2 is fixed at a tip part; the internal needle 4 having a sharp needle tip 41 at the tip part; an internal needle hub 5 where the internal needle 4 is fixed at the tip part; an internal needle hub cover 6 joined to the tip part of the internal needle hub 5 and capable of forming a side hole 61 which can communicate the outside and inside of the internal needle hub 5; a protector 7 having a protector body 71 and a needle tip protection part 72 provided on the tip side of the protector body 71 and capable of protecting the needle tip 41 of the internal needle 4; and a connector 8 capable of connecting the external needle hub 3 and the needle tip protection part 72. The protector body 71 of the protector 7 is slidably inserted into the side hole 61, the needle tip protection part 72 is slidably arranged on the internal needle 4, and the internal needle hub cover 6 has a shape capable of housing at least a part of the needle tip protection part 72. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、輸液等を行うために血管内に一時的に留置される留置針を含む留置針組立体に関する。より詳細には、生体組織に内針および外針を同時に穿刺し、外針を留置して該外針から内針を抜去した後、該内針を安全かつ容易に針ガード内に収納することができる留置針組立体に関する。
【0002】
【従来の技術】
輸液などに用いられる留置針は、通常外針と内針からなる2重構造を有しており、使用に際しては、外針の内腔に内針が挿入された状態で血管に穿刺される。次いで、前記外針が所定位置まで挿入された後、前記内針は外針の内腔より抜き取られ、前記外針の基端部に輸液ラインなどが接続され、輸液や薬液などが血管中に導入される。したがって、前記外針は血管内を傷つけるおそれの少ない軟質樹脂製のものが、また前記内針は血管への穿刺が容易である金属製のものが一般に用いられる。
【0003】
前記外針が患者の体内に留置された後、抜き取られた内針は廃棄されることになるが、医療従事者や患者等が誤って、その鋭利な針先に触れて傷を負う場合がある。また、前記針先が適当な方法で保護されたとしても、肝炎や後天性免疫不全症候群(エイズ)など血液により感染する疾病を有した患者に使用された内針は、針先に限らずそれ自身が疾病の感染媒体になりうる。
このため、患者に穿刺した内針を適正に処分することが極めて重要であるが、医療現場においては患者の処置が優先され、内針の廃棄は後回しにされることが多い。
【0004】
近年、使用後の内針を直ちにかつ容易に廃棄するため、内針を収納可能な針ガードを有してなる留置針組立体が提案されている(例えば、特許文献1参照。)。前記留置針組立体は、内針を内挿した外針が患者に穿刺され、該外針を患者に留置した状態で内針が抜去された後、前記前記針ガードが先端側へ摺動することにより前記内針が該針ガード内に収納されるものである。また、内針ハブと針ガードの基端部との間にバネが配設され、押しボタン式のロック機構を解除すると、バネの力によって内針が針ガードの基端へと作動せしめられる留置針組立体も開発されている(例えば、特許文献2参照。)。
これらの留置針組立体は、片手で容易に操作されうるため、内針が抜去された後すぐに保護され、医療従事者が該内針の先端によって傷を負ったり、該内針に付着した血液により疾病に感染するおそれがない。しかし、いずれの留置針組立体も形状が大きいため操作しにくく、廃棄物量も極めて多くなる。また、押しボタン式のロック機構を設けた留置針組立体は、これを使用する者が誤って押しボタンを押してロックを解除してしまった場合、元に戻すことができないため、使用不能になるおそれがある。
【0005】
一方、上記問題点を解決しうる針組立体として、針先端を保護しうる針ガードが針に沿って移動しうるコンパクトな針組立体が提案されている(例えば、特許文献3参照。)。前記針組立体は、針ハブとハブカバーとにより形成される側孔にプロテクターが挿通させられ、プロテクター先端に設けられた針先保護部が針上を摺動して針先端を保護する構造を有してなる。
しかしながら、前記針組立体は主として注射針への適応を考慮したものであるため、このままの形状では留置針に適応させることはできない。留置針組立体は外針の内腔に内針が挿入された状態で血管に穿刺されるものであるが、前記針組立体をそのままの構造で留置針に用いた場合、針上に配置された針先保護部が外針と内針との確実な固定を妨げ、留置針組立体としての操作性が悪くなる。また外針ハブの構造を、針先保護部の存在にかかわらず内針に確実に固定されるように変更した場合、従来の外針ハブに接続されていた輸液ラインや輸血ラインを接続することができなくなる。
【0006】
【特許文献1】
特開平3−63066号公報
【特許文献2】
特開平8−215315号公報
【特許文献3】
特開2003−33435号公報
【0007】
【発明が解決しようとする課題】
上記事情に鑑み、本発明は患者への導入時に外針と内針とが確実に固定され、かつ、従来の輸液ライン等をそのまま接続して使用できる留置針組立体を提供することを課題とする。
【0008】
【課題を解決するための手段】
本発明者らは、上記課題を解決するために種々鋭意検討した結果、外針ハブとプロテクターの針先保護部とを直接連結しうる連結具を用い、操作時に適宜連結を解除することにより、外針と内針の固定が確実で、かつ、従来の輸液ライン等をそのまま接続して使用できる留置針組立体が得られることを見出し、本発明に到達した。
【0009】
すなわち、本発明は、
(1) 生体組織に穿刺され留置される外針、前記外針が先端部に固着された外針ハブ、該外針の内腔に挿通可能であって先端部に鋭利な針先を有する内針、前記内針が先端部に固着された内針ハブ、前記内針ハブの先端部に接合して内針ハブの外部と内部を連通しうる側孔を形成しうる筒状の内針ハブカバー、細長い棒状の本体と前記本体の先端側に設けられた前記内針の針先を保護しうる針先保護部とを有するプロテクター、および前記外針ハブと前記針先保護部とを連結しうる連結具からなる留置針組立体であって、前記プロテクターの本体は前記側孔内に摺動可能に挿通され、前記針先保護部は前記内針上に摺動可能に配置され、前記内針ハブカバーは前記針先保護部の少なくとも一部を収容しうる形状を有してなる留置針組立体、
(2) 前記連結具は、先端部が嵌合または螺合により前記外針ハブの基端部に接続され、基端部が嵌合または螺合により前記針先保護部の先端部に接続されてなる前記(1)記載の留置針組立体、
(3) 前記連結具は、両端に雌ねじ部を有してなり、先端側雌ねじ部が螺合により前記外針ハブの基端部に接続され、基端側雌ねじ部が螺合により前記針先保護部の先端部に接続されてなる前記(2)記載の留置針組立体、
(4) 前記連結具は、基端部が前記針先保護部の先端部に固着されてなる前記(1)〜(3)のいずれかに記載の留置針組立体、
(5) 前記留置針組立体は、前記針先保護部の少なくとも一部が内針ハブカバー内に配置される位置で前記プロテクターを位置決めしうる第一位置決め手段を備えてなる前記(1)〜(4)のいずれかに記載の留置針組立体、
(6) 前記第一位置決め手段は、前記内針ハブの先端部と、前記プロテクターの針先保護部との係合によるものである前記(5)記載の留置針組立体、
(7) 前記留置針組立体は、前記針先保護部が前記内針の針先を保護しうる位置で前記プロテクターを位置決めしうる第二位置決め手段を備えてなる前記(1)〜(6)のいずれかに記載の留置針組立体、
(8) 前記第二位置決め手段は、前記プロテクターの基端部と内針ハブカバーとの係合によるものである前記(7)記載の留置針組立体、
(9) さらに、針先を保護するためのキャップを備えた前記(1)〜(8)のいずれかに記載の留置針組立体
に関する。
【0010】
【発明の実施の形態】
以下に、本発明の留置針組立体を添付図面に示す好適な実施例に基づいて詳細に説明するが、本発明はこれらの説明に限定されるものではない。
図1は本発明の留置針組立体の一実施例において、針先保護前の状態を示す上部側面図であり、図2は図1に示される留置針組立体のA−A線断面図、図3は図2に示される留置針組立体のB−B線断面図である。図4は図2に示される留置針組立体の、針先保護後の状態を示す縦断面図であり、図5は図2に示される留置針組立体の、患者の体内に留置される部分を示す縦断面図である。また、図6は本発明の留置針組立体の他の実施例において、針先保護前の状態を示す上部側面図である。
図1および図2に示されるように、本発明の留置針組立体1は、外針2が先端部に固着された外針ハブ3と、内針4が先端部に固着された内針ハブ5と、内針ハブ5の先端部に接合しうる内針ハブカバー6と、内針4の針先41を保護しうるプロテクター7と、外針ハブ3とプロテクター7とを連結しうる連結具8とを有している。
本発明の針組立体において、先端とは患者等に穿刺する側の端(図中、右端)を、基端とは先端の反対側の端(図中、左端)を指す。
【0011】
外針2は中空の管であり、その先端部は刺通抵抗を低くするために、先端側にむかって外径が減少するテーパー状に形成されていることが好ましい。前記外針2は、患者の体内に挿入された後しばらく留置されるため、患者を傷つけるおそれの少ない軟質樹脂で形成されていることが好ましい。前記軟質樹脂としては、具体的には、エチレン−テトラフルオロエチレン共重合体、ポリウレタン、ポリエーテルナイロン樹脂等があげられる。
前記外針2は、患者の体内に留置されている間に患者が動いたりすることによって裂断される場合がある。このような場合に、裂断された外針2の破片を探知するために、該外針2の材料中に硫酸バリウム等のX線造影剤を配合させて、該外針2に造影機能を持たせることも可能である。
また、前記外針2は、液採取あるいは液導入時の液流量を確保するために、先端部に1つ以上のサイドホール21が設けられていてもよい。
【0012】
前記外針2の基端部には外針ハブ3が固着されている。その固着方法としては、カシメピンによりかしめて固定する方法の他、接着剤による接着や、熱による融着などがあげられる。
前記外針ハブ3は中空の管体であり、基端部は基端側に向かって内径が増加するテーパー状に形成されていることが好ましい。該テーパー形状によって、該外針ハブ3の基端部には輸液セットのチューブ等が確実に接続されうる。また、該外針ハブ3の基端部外周には、シリンジや輸液セットのチューブ等のロックタイプのルアーテーパー部に接続するための突起31が設けられていてもよい。
前記外針ハブ3の材質としては、ポリエチレン、ポリプロピレン、エチレン−酢酸ビニル共重合体等のポリオレフィン、ポリ塩化ビニル、ポリブタジエン、ポリアミド、ポリエステル等の硬質樹脂が用いられる。
また、外針ハブ3は輸液操作や輸血操作に必要な公知の部品、例えば図5に示されるような内針4が抜去された状態において、外針2内に浸入してきた血液の漏洩を防止するためのクランプチューブ32や疎水性フィルターなどが設けられていてもよい。さらに、不使用時に机上に戴置した場合などに転がりを防止しうるように、あるいは医療従事者が把持しやすいように、外周面上にリブ33などが設けられていてもよい。
【0013】
本発明に用いられる内針4は、前記外針2の内腔に挿通可能な中空の管であり、その先端部には鋭利な針先41が形成されており、該針先41は刺通抵抗を低くするために傾斜した刃面を有している。前記内針4は、前記外針2内に挿入された状態で患者に穿刺されるため、該外針2に内挿された時に前記針先41が該外針2の先端側から突出する長さを有している必要がある。該内針4の材質としては、ステンレス鋼、アルミニウム、チタン、あるいはこれらの合金等の金属材料があげられる。
【0014】
前記内針4の基端部には内針ハブ5が固着されている。その固着方法としては、接着剤による接着や、熱による融着等があげられる。該内針ハブ5は、該内針4の内部と連通する内腔を有する中空の管体である。
該内針ハブ5の基端部は、基端側に向かって内径が増加するテーパー状に形成されていることが好ましい。このテーパー形状によって、該内針ハブ5の基端部には、採血用のシリンジ等を確実に接続することができる。また前記針先41が患者の血管に穿刺されたとき、前記内針4内部に浸入した血液は該内針ハブ5内に到達する。したがって、本発明の留置針組立体は該内針ハブ5内に浸入した血液が該内針ハブ5の基端部から漏出することを防止するために、該内針ハブ5の基端部にフィルター51を有する部材52が接続された状態で使用されることが好ましい。
前記内針ハブ5の材質としては、ポリカーボネート、アクリロニトリル−ブタジエン−スチレン共重合体、ポリスチレン、ポリエチレン、ポリプロピレン等の硬質材料が好ましく用いられる。
【0015】
前記内針ハブ5先端部には、先端から基端へ貫通した中空の管体である内針ハブカバー6が外挿されている。前記内針ハブ5および内針ハブカバー6は、互いに接合して内針ハブ5の外部と内部とを連通しうる側孔61が形成される形状を有している。前記内針ハブ5と内針ハブカバー6の接合方法としては、エポキシ樹脂、UV硬化接着剤等による接着、或いは超音波溶着による溶着等があげられる。前記内針ハブ5および内針ハブカバー6は一体成形されたものであってもよく、その場合側孔61が、切削等により作成されるか、あるいは、内針ハブカバー6の一部が開閉可能であるように、ヒンジ等が形成される。
前記内針ハブカバー6の外周には、留置針組立体1使用前に内針4および針先41を保護するために該内針4および針先41に被せられるキャップ(図示せず)を固定するために、図3に示されるような複数個のリブ62が設けられていてもよい。
前記内針ハブカバー6の材質としては、内針ハブ5と同様の硬質材料が好ましく用いられる。
【0016】
本発明の留置針組立体1の構成要件の一つであるプロテクター7は、細長い棒状の本体71を有しており、適度に柔軟な材料から形成される。該材料は、具体的には、ポリプロピレン、ポリカーボネート、アクリロニトリル−ブタジエン−スチレン共重合体、ポリスチレン、ポリエチレン、ポリアセタール等である。該プロテクター本体71は、前記内針ハブ5と内針ハブカバー6の接合により形成される側孔61内に挿通され、先端側または基端側へ摺動されうるように配置される。
該プロテクター本体71の断面形状は特に限定されないが、前記側孔61内に挿通されて摺動される際の摩擦を最小限にするために、該側孔61の形状に即したものであることが好ましい。例えば、側孔61の形状が四角形である場合は、プロテクター本体71の断面形状も四角形、あるいは長方形の平板状のものであることが好ましい。
【0017】
前記内針ハブ5と内針ハブカバー6の接合の一例が、図3に詳細に示される。前記内針ハブ5はその外周に放射状に配置される4つのリブ53を有している。該リブ53は内針ハブ5が前記内針ハブカバー6内に挿入されたときに、該リブ53が内針ハブカバー6の内壁面に接する大きさに形成されており、該リブ53が内針ハブカバー6と接合されることによって該内針ハブ5と内針ハブカバー6は一体となる。図3に示されるように、前記内針ハブカバー6の内腔が前記リブ53により4つの通路に分断される場合、後述するプロテクター本体71は分断された通路の一つに配置されることになる。
このとき、該プロテクター本体71の断面形状は、分断された通路の断面形状と相似した形状であることがより好ましい。
【0018】
前記プロテクター本体71の先端側には、該内針4の針先41を収納可能な針先保護部72が形成されている。該針先保護部72は、中空筒状で、少なくとも一部が前記内針ハブカバー6の内腔に収容されうる形状を有している。該針先保護部72は、該プロテクター本体71が側孔61内を摺動するのに応じて、前記内針4上を先端側または基端側へ摺動しうるが、該針先保護部72の基端側への摺動は、該針先保護部72の基端部が前記内針ハブ5の先端部に当接することにより停止される。該針先保護部72は、前記プロテクター本体71と一体成形されても良いし、該プロテクター本体71とは別に成形された後に、該プロテクター本体71と接着あるいは溶着されてもよい。
【0019】
本発明の留置針組立体1は、さらに前記外針ハブ3と前記針先保護部72とを連結しうる連結具8を有してなる。該連結具8は先端部が該外針ハブ3と接続され、基端部が針先保護部72と接続される構造を有している。前記接続は、嵌合または螺合であることが好ましい。該連結具8の好ましい構造の一例は、図2に示されるように、先端部に雌ねじ部81が形成され、基端部に雌ねじ部82が形成された構造である。図2に示される連結具8においては、先端部に設けられた雌ねじ部81が該外針ハブ3の基端部に設けられた突起31と螺合し、基端部に設けられた雌ねじ部81が該針先保護部72の先端部に設けられた突部73と螺合しうる。また該連結具8の好ましい構造の他の例は、図6に示されるように、先端部に係合爪83が形成された構造である。
前記連結具8の先端部は、前記外針ハブ3と脱着可能に接続される必要があるが、基端部と前記針先保護部72との接続は脱着可能である必要はなく、図6に示されるように、該連結具8と該針先保護部72とが接着や溶着などにより固着されていてもよい。
【0020】
前記連結具8は、図5に示される内針4が抜去された状態において、血液の漏洩を防止するための疎水性フィルター84が予め内設されていてもよい。該疎水性フィルターは、空気は透過させるが血液は透過させないものであり、具体的には、ポリプロピレン、ポリスチレン、ポリメチルメタクリレート等の合成樹脂製の焼結フィルターや不織布等が好ましく用いられる。
該疎水性フィルター84が内設された連結具8は、基端部が前記針先保護部72に固着されていると、内針4抜去時に針先保護部72とともに該疎水性フィルター84が外針ハブ3から取り外されてしまうため、外針2内に浸入した血液の漏洩を防止することができないため好ましくない。しかし、図6に示されるように、前記連結具8が、先端部に雌ねじ部81を有し基端部に疎水性フィルター84を設けた第一連結具85と、先端部に係合爪83を有し基端部が針先保護部72に固着された第二連結具86の二部品から形成されるものであれば、血液漏洩の問題は生じない。図6に示される連結具8においては、第二連結具86の先端部に設けられる係合爪83は、第一連結具85の先端部に直接、脱着可能に嵌合しうる。
【0021】
前記プロテクター7は、留置針組立体1使用前および使用中、つまり前記針先41が保護されていない状態においては、図1および図2に示されるように、前記針先保護部72の少なくとも一部が前記内針ハブカバー6内に配置される。一方、留置針組立体1使用後、該プロテクター7は留置針組立体1を保持している医療従事者の指で押されて先端側へと摺動し、図4に示されるように、前記針先保護部72により前記針先41は保護される。
【0022】
前記留置針組立体1には、前記プロテクター7を、針先41が保護されていない位置、すなわち図2に示されるように前記針先保護部72の少なくとも一部が内針ハブカバー6内に配置される位置で位置決めするための、第一位置決め手段が備えられることが好ましい。該第一位置決め手段は、該針先保護部72の先端側への移動を防止しうるものである。
前記第一位置決め手段は、例えば図2に示されるように、内針ハブ5の先端部と針先保護部72との嵌合または係合によるものである。この場合、該内針ハブ5の先端部の外径は該針先保護部72の内径よりも小さく、該針先保護部72の基端部が該内針ハブ5の先端部に外挿された状態であることが好ましい。該内針ハブ5と針先保護部72との係合の具体例としては、内針ハブ5の先端部外周面に設けられた凸部または凹部と、該針先保護部72の基端部内周面に設けられた凹部または凸部との係合があげられる。
【0023】
また、前記留置針組立体1には、前記プロテクター7を、針先41が保護される位置で位置決めするための、第二位置決め手段が備えられることが好ましい。該第二位置決め手段は、該プロテクター7の先端側および基端側への移動を防止しうるものであり、例えば該プロテクター7の基端部と該内針ハブカバー6との係合によるものである。
該第二位置決め手段のうち、該プロテクター7の先端側への移動を防止しうるものとしては、例えば図4に示されるように、該プロテクター7の基端部に設けられた係合アーム74と前記内針ハブカバー6の側孔61を形成する部分との係合によるものであってもよい。該プロテクター7の基端部が側孔61を通過できない程度に十分に大きい場合は、特別に前記係合アーム74が設けられなくとも、該プロテクター7の先端側への移動を防止する機能を果たしうる。
一方、該第二位置決め手段のうち、該プロテクター7の基端側への移動を防止しうるものとしては、例えば、図4に示すように、該プロテクター7の係合アーム74の先端部に内方向に向けて設けられた突起75と内針ハブカバー6の先端部との係合によるものであってもよい。
【0024】
また、前記プロテクター7が前記第二位置決め手段により、針先41が保護される位置で位置決めされている場合、前記プロテクター7の針先保護部72の先端部内周面に突起76が設けられていれば、該突起76が針先41と係合することにより該針先41が該針先保護部72の先端側へ突出することを防止できてより好ましい。また、プロテクター本体71に、図4に示すように外方へ反る屈曲部77、あるいは緩やかにカーブした湾曲部(図示せず)が設けられている場合、前記突起76と針先41との係合はより確実になり好ましい。
【0025】
図1および図2に示される留置針組立体1の組み立て方法としては、まず、内針ハブ5の先端部に固着された内針4の針先41が、プロテクター7の針先保護部72の内腔に基端側から挿通され、該針先保護部72が該内針ハブ5の先端部に外挿される。次に、前記内針4の針先41が内針ハブカバー6内に挿通され、該内針ハブカバー6が前記内針ハブ5と接合するまで基端側に移動させられ、側孔61を形成した状態で該針先保護部72上に配置される。一方、外針ハブ3の基端部は、予め連結具8の先端部と接続される。前記内針4の針先41は、該連結具8および該外針ハブ3内を通って外針2内に挿通され、該針先41が該外針2の先端から突出するまで先端側へ移動させられる。その後、前記連結具8の基端部が前記針先保護部72の先端部と接続されて、留置針組立体1の組み立てが完了する。このとき、該プロテクター7は、前記第一位置決め手段により、該針先保護部72の少なくとも一部が該内針ハブカバー6内に配置される位置で位置決めされるため、該プロテクター7の先端側への移動が防止される。
【0026】
図1および図2に示される留置針組立体1の使用方法としては、まず前記組み立て方法により組み立てられた留置針組立体1が、内針4の針先41が外針2の先端部から突出した状態で患者の血管に穿刺される。該外針2が血管内の所定の位置に配置された後、連結具8の基端部と針先保護部72との接続が解除され、該外針2内から該内針4が抜去され、該外針2は図5に示される状態で患者に留置される。該外針4から抜去された内針4は、プロテクター7が先端側へと摺動させられ、図4に示されるように該針先41が該針先保護部72内に収納される。患者に留置された外針2は、該連結具8の先端部と外針ハブ3の基端部との接続が解除され、所望のラインが該外針ハブ3の基端部に接続されて使用される。一方、図6に示される留置針組立体1の使用方法としては、内針4の針先41が外針2の先端部から突出した状態で患者の血管に穿刺され、該外針2が血管内の所定の位置に配置された後、第二連結具86の先端部と第一連結具8との接続が解除され、該外針2内から該内針4が抜去される。該外針4から抜去された内針4は、プロテクター7が該第二連結具86と共に先端側へと摺動させられ、針先41針先保護部72内に収納される。患者に留置された外針2は、該第一連結具8の先端部と外針ハブ3の基端部との接続が解除され、所望のラインが該外針ハブ3の基端部に接続されて使用される。
【0027】
本発明の留置針組立体1は、図1、図2および図6に示されるような針先41が保護されていない状態で販売される場合、該針先41を保護しうるキャップ(図示せず)を備えたものであることが好ましい。使用時には、該留置針組立体1は、該キャップが取り除かれて使用される。
【0028】
【発明の効果】
本発明の留置針組立体は、外針ハブとプロテクターの針先保護部とを直接連結しうる連結具を用いたことにより、外針と内針との固定が確実になり、留置針組立体の操作に影響を及ぼすおそれがない。また本発明の留置針組立体は、内針と外針の固定を確実にするために外針ハブの形状を変更する必要がないため、従来の輸液ライン等をそのまま接続して使用することができる。
【図面の簡単な説明】
【図1】本発明の留置針組立体の一実施例において、針先保護前の状態を示す上部側面図である。
【図2】図1に示される留置針組立体のA−A線断面図である。
【図3】図2に示される留置針組立体のB−B線断面図である。
【図4】図2に示される留置針組立体の、針先保護後の状態を示す縦断面図である。
【図5】図2に示される留置針組立体の、患者の体内に留置される部分を示す縦断面図である。
【図6】本発明の留置針組立体の他の実施例において、針先保護前の状態を示す上部側面図である。
【符号の説明】
1 留置針組立体
2 外針
3 外針ハブ
4 内針
41 針先
5 内針ハブ
6 内針ハブカバー
61 側孔
7 プロテクター
71 プロテクター本体
72 針先保護部
8 連結具
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an indwelling needle assembly including an indwelling needle temporarily indwelled in a blood vessel for performing infusion or the like. More specifically, the inner needle and the outer needle are simultaneously punctured into the living tissue, the inner needle is placed in place, the inner needle is removed from the outer needle, and then the inner needle is safely and easily stored in the needle guard. The present invention relates to an indwelling needle assembly that can be used.
[0002]
[Prior art]
An indwelling needle used for infusion or the like usually has a double structure composed of an outer needle and an inner needle. When used, the indwelling needle is punctured into a blood vessel with the inner needle inserted into the lumen of the outer needle. Next, after the outer needle is inserted to a predetermined position, the inner needle is withdrawn from the lumen of the outer needle, an infusion line or the like is connected to the proximal end of the outer needle, and an infusion or a drug solution is injected into the blood vessel. be introduced. Therefore, the outer needle is generally made of a soft resin that is less likely to damage the inside of the blood vessel, and the inner needle is generally made of a metal that can easily puncture the blood vessel.
[0003]
After the outer needle is placed in the body of the patient, the extracted inner needle is discarded.However, there is a case where a medical worker, a patient, or the like accidentally touches the sharp needle tip and is injured. is there. Even if the needle tip is protected by an appropriate method, the inner needle used for a patient having a blood-transmitted disease such as hepatitis or acquired immunodeficiency syndrome (AIDS) is not limited to the needle tip. It can itself be a vehicle for transmission of the disease.
For this reason, it is extremely important to properly dispose of the inner needle punctured by the patient, but in a medical setting, treatment of the patient is prioritized, and discarding of the inner needle is often postponed.
[0004]
In recent years, an indwelling needle assembly having a needle guard capable of storing the inner needle has been proposed in order to immediately and easily discard the used inner needle (for example, see Patent Document 1). The indwelling needle assembly is configured such that the outer needle having the inner needle inserted therein is punctured by the patient, and the inner needle is withdrawn while the outer needle is indwelled in the patient, and then the needle guard slides toward the distal end. Thereby, the inner needle is housed in the needle guard. A spring is provided between the inner needle hub and the proximal end of the needle guard. When the push-button locking mechanism is released, the inner needle is moved to the proximal end of the needle guard by the force of the spring. Needle assemblies have also been developed (see, for example, Patent Document 2).
Since these indwelling needle assemblies can be easily operated with one hand, they are protected immediately after the inner needle is withdrawn, and a medical worker is injured by the tip of the inner needle or adhered to the inner needle. There is no risk of being infected by blood. However, all of the indwelling needle assemblies are difficult to operate due to their large shape, and the amount of waste is extremely large. In addition, the indwelling needle assembly provided with the push-button lock mechanism cannot be used because the lock cannot be restored if the user accidentally presses the push button to release the lock. There is a risk.
[0005]
On the other hand, as a needle assembly that can solve the above-described problems, a compact needle assembly that can move a needle guard that can protect the needle tip along the needle has been proposed (for example, see Patent Document 3). The needle assembly has a structure in which a protector is inserted into a side hole formed by a needle hub and a hub cover, and a needle tip protection portion provided at the tip of the protector slides on the needle to protect the tip of the needle. Do it.
However, since the needle assembly is designed mainly for adaptation to an injection needle, it cannot be adapted to an indwelling needle in its original shape. The indwelling needle assembly is punctured in a blood vessel while the inner needle is inserted into the lumen of the outer needle.However, when the needle assembly is used as an indwelling needle with the same structure, it is arranged on the needle. In addition, the needle tip protection portion prevents reliable fixing of the outer needle and the inner needle, and the operability of the indwelling needle assembly is deteriorated. Also, if the structure of the outer needle hub is changed so that it is securely fixed to the inner needle regardless of the presence of the needle tip protection section, connect the infusion line or blood transfusion line connected to the conventional outer needle hub. Can not be done.
[0006]
[Patent Document 1]
JP-A-3-63066 [Patent Document 2]
JP-A-8-215315 [Patent Document 3]
JP 2003-33435 A
[Problems to be solved by the invention]
In view of the above circumstances, an object of the present invention is to provide an indwelling needle assembly in which an outer needle and an inner needle are securely fixed at the time of introduction into a patient, and can be used by directly connecting a conventional infusion line or the like. I do.
[0008]
[Means for Solving the Problems]
The present inventors have conducted various studies in order to solve the above-mentioned problems, and as a result, by using a connecting tool that can directly connect the outer needle hub and the needle tip protection portion of the protector, by appropriately releasing the connection during operation, The inventor has found that an indwelling needle assembly can be obtained in which the outer needle and the inner needle are securely fixed, and which can be used by directly connecting a conventional infusion line or the like as it is.
[0009]
That is, the present invention
(1) An outer needle that is punctured and placed in a living tissue, an outer needle hub to which the outer needle is fixed at a distal end portion, and an inner needle that can be inserted into a lumen of the outer needle and has a sharp needle tip at the distal end portion. A needle, an inner needle hub having the inner needle fixed to a distal end thereof, and a tubular inner needle hub cover capable of forming a side hole which can be connected to the distal end of the inner needle hub to allow communication between the outside and the inside of the inner needle hub. A protector having an elongated rod-shaped main body and a needle tip protection portion provided on the tip end side of the main body and capable of protecting the needle tip of the inner needle, and connecting the outer needle hub and the needle tip protection portion. An indwelling needle assembly comprising a connector, wherein the body of the protector is slidably inserted into the side hole, the needle tip protection portion is slidably disposed on the inner needle, and the inner needle An indwelling needle assembly, wherein the hub cover has a shape capable of accommodating at least a part of the needle tip protection portion;
(2) The connecting tool has a distal end connected to the proximal end of the outer needle hub by fitting or screwing, and a proximal end connected to the distal end of the needle tip protecting unit by fitting or screwing. The indwelling needle assembly according to the above (1),
(3) The connecting tool has female screw portions at both ends, a distal female screw portion is connected to a proximal end of the outer needle hub by screwing, and a proximal female screw portion is threaded by the needle tip. The indwelling needle assembly according to the above (2), wherein the indwelling needle assembly is connected to a tip portion of the protection portion
(4) The indwelling needle assembly according to any one of (1) to (3), wherein the coupling tool has a base end portion fixed to a tip end portion of the needle tip protection portion.
(5) The indwelling needle assembly is provided with first positioning means capable of positioning the protector at a position where at least a part of the needle tip protection portion is disposed in the inner needle hub cover. 4) The indwelling needle assembly according to any one of the above,
(6) The indwelling needle assembly according to (5), wherein the first positioning means is formed by engagement of a distal end portion of the inner needle hub with a needle tip protection portion of the protector.
(7) The indwelling needle assembly is provided with a second positioning means capable of positioning the protector at a position where the needle tip protection section can protect the needle tip of the inner needle. The indwelling needle assembly according to any of the above,
(8) The indwelling needle assembly according to (7), wherein the second positioning means is formed by engagement between a base end of the protector and an inner needle hub cover.
(9) The indwelling needle assembly according to any one of (1) to (8), further including a cap for protecting the needle tip.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the indwelling needle assembly of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings, but the present invention is not limited to these descriptions.
FIG. 1 is an upper side view showing an indwelling needle assembly according to an embodiment of the present invention before protection of a needle tip. FIG. 2 is a cross-sectional view of the indwelling needle assembly shown in FIG. FIG. 3 is a sectional view of the indwelling needle assembly shown in FIG. 2 taken along line BB. FIG. 4 is a longitudinal sectional view showing a state of the indwelling needle assembly shown in FIG. 2 after protection of the needle tip, and FIG. 5 is a portion of the indwelling needle assembly shown in FIG. FIG. FIG. 6 is an upper side view showing another embodiment of the indwelling needle assembly according to the present invention before protection of the needle tip.
As shown in FIGS. 1 and 2, an indwelling needle assembly 1 according to the present invention includes an outer needle hub 3 having an outer needle 2 fixed to a distal end, and an inner needle hub having an inner needle 4 fixed to a distal end. 5, an inner needle hub cover 6 that can be joined to the tip of the inner needle hub 5, a protector 7 that can protect the needle tip 41 of the inner needle 4, and a connector 8 that can connect the outer needle hub 3 and the protector 7. And
In the needle assembly of the present invention, the distal end refers to an end (right end in the figure) on the side that punctures a patient or the like, and the proximal end refers to an end opposite to the distal end (left end in the figure).
[0011]
The outer needle 2 is a hollow tube, and its distal end is preferably formed in a tapered shape whose outer diameter decreases toward the distal end in order to reduce piercing resistance. Since the outer needle 2 is left for a while after being inserted into the body of the patient, it is preferable that the outer needle 2 is formed of a soft resin that is less likely to damage the patient. Specific examples of the soft resin include an ethylene-tetrafluoroethylene copolymer, polyurethane, and a polyether nylon resin.
The outer needle 2 may be torn due to movement of the patient while being placed in the body of the patient. In such a case, in order to detect a broken piece of the outer needle 2, an X-ray contrast agent such as barium sulfate is blended into the material of the outer needle 2, and the outer needle 2 has a contrast function. It is also possible to have.
In addition, the outer needle 2 may be provided with one or more side holes 21 at a distal end thereof in order to secure a liquid flow rate during liquid collection or liquid introduction.
[0012]
An outer needle hub 3 is fixed to a base end of the outer needle 2. Examples of the fixing method include a method of fixing by caulking with a caulking pin, adhesion by an adhesive, fusion by heat, and the like.
It is preferable that the outer needle hub 3 is a hollow tubular body, and the base end is formed in a tapered shape whose inner diameter increases toward the base end. Due to the tapered shape, a tube or the like of an infusion set can be securely connected to the base end of the outer needle hub 3. Further, a projection 31 for connecting to a lock type luer taper portion such as a syringe or a tube of an infusion set may be provided on the outer periphery of the proximal end portion of the outer needle hub 3.
As a material of the outer needle hub 3, a hard resin such as polyolefin such as polyethylene, polypropylene and ethylene-vinyl acetate copolymer, polyvinyl chloride, polybutadiene, polyamide and polyester is used.
Further, the outer needle hub 3 prevents leakage of blood that has penetrated into the outer needle 2 in a state where a known component necessary for the infusion operation or the blood transfusion operation, for example, the inner needle 4 as shown in FIG. For example, a clamp tube 32 or a hydrophobic filter may be provided. Further, a rib 33 or the like may be provided on the outer peripheral surface so as to prevent rolling when the device is placed on a desk when not in use, or to facilitate grasping by a medical worker.
[0013]
The inner needle 4 used in the present invention is a hollow tube that can be inserted into the lumen of the outer needle 2, and has a sharp needle tip 41 formed at the distal end thereof. It has an inclined blade surface to reduce resistance. Since the inner needle 4 is punctured by a patient while being inserted into the outer needle 2, the needle tip 41 projects from the distal end side of the outer needle 2 when inserted into the outer needle 2. Need to have Examples of the material of the inner needle 4 include metal materials such as stainless steel, aluminum, titanium, and alloys thereof.
[0014]
An inner needle hub 5 is fixed to the base end of the inner needle 4. Examples of the fixing method include adhesion with an adhesive and fusion with heat. The inner needle hub 5 is a hollow tubular body having a lumen communicating with the inside of the inner needle 4.
The proximal end portion of the inner needle hub 5 is preferably formed in a tapered shape whose inner diameter increases toward the proximal end side. With this tapered shape, a syringe for blood collection or the like can be reliably connected to the base end of the inner needle hub 5. Further, when the needle tip 41 is punctured into a blood vessel of a patient, the blood that has penetrated into the inner needle 4 reaches the inner needle hub 5. Accordingly, the indwelling needle assembly of the present invention is provided at the proximal end of the inner needle hub 5 in order to prevent blood infiltrated into the inner needle hub 5 from leaking from the proximal end of the inner needle hub 5. It is preferable that the member 52 having the filter 51 is used in a connected state.
As a material of the inner needle hub 5, a hard material such as polycarbonate, acrylonitrile-butadiene-styrene copolymer, polystyrene, polyethylene, and polypropylene is preferably used.
[0015]
An inner needle hub cover 6, which is a hollow tube penetrating from the distal end to the proximal end, is externally inserted into the distal end portion of the inner needle hub 5. The inner needle hub 5 and the inner needle hub cover 6 have a shape in which a side hole 61 that can be connected to each other to allow communication between the outside and the inside of the inner needle hub 5 is formed. As a joining method of the inner needle hub 5 and the inner needle hub cover 6, there are bonding by an epoxy resin, a UV curing adhesive or the like, welding by ultrasonic welding, and the like. The inner needle hub 5 and the inner needle hub cover 6 may be integrally formed. In this case, the side hole 61 is formed by cutting or the like, or a part of the inner needle hub cover 6 can be opened and closed. As is the case, a hinge or the like is formed.
A cap (not shown) that covers the inner needle 4 and the needle tip 41 is secured to the outer periphery of the inner needle hub cover 6 to protect the inner needle 4 and the needle tip 41 before using the indwelling needle assembly 1. For this purpose, a plurality of ribs 62 as shown in FIG. 3 may be provided.
As the material of the inner needle hub cover 6, the same hard material as that of the inner needle hub 5 is preferably used.
[0016]
The protector 7, which is one of the components of the indwelling needle assembly 1 of the present invention, has an elongated rod-shaped main body 71, and is formed of a moderately flexible material. The material is, specifically, polypropylene, polycarbonate, acrylonitrile-butadiene-styrene copolymer, polystyrene, polyethylene, polyacetal, or the like. The protector body 71 is inserted into a side hole 61 formed by joining the inner needle hub 5 and the inner needle hub cover 6, and is arranged so as to be slidable to the distal end side or the proximal end side.
The cross-sectional shape of the protector main body 71 is not particularly limited, but it should conform to the shape of the side hole 61 in order to minimize friction when the protector body 71 is inserted into the side hole 61 and slid. Is preferred. For example, when the shape of the side hole 61 is square, the cross-sectional shape of the protector body 71 is preferably a square or rectangular flat plate.
[0017]
An example of the connection between the inner needle hub 5 and the inner needle hub cover 6 is shown in detail in FIG. The inner needle hub 5 has four ribs 53 radially arranged on its outer periphery. When the inner needle hub 5 is inserted into the inner needle hub cover 6, the rib 53 is formed in such a size that the rib 53 comes into contact with the inner wall surface of the inner needle hub cover 6. 6, the inner needle hub 5 and the inner needle hub cover 6 are integrated. As shown in FIG. 3, when the inner cavity of the inner needle hub cover 6 is divided into four passages by the rib 53, a protector body 71 described later is disposed in one of the divided passages. .
At this time, it is more preferable that the cross-sectional shape of the protector body 71 is similar to the cross-sectional shape of the divided passage.
[0018]
On the tip side of the protector main body 71, a needle tip protection portion 72 capable of storing the needle tip 41 of the inner needle 4 is formed. The needle tip protection portion 72 is hollow cylindrical and has such a shape that at least a part thereof can be accommodated in the lumen of the inner needle hub cover 6. The needle tip protection section 72 can slide on the inner needle 4 to the distal end side or the base end side as the protector body 71 slides in the side hole 61. The sliding of the base 72 toward the base end is stopped by the base end of the needle tip protection portion 72 abutting on the front end of the inner needle hub 5. The needle tip protection portion 72 may be formed integrally with the protector main body 71, or may be formed separately from the protector main body 71 and then adhered or welded to the protector main body 71.
[0019]
The indwelling needle assembly 1 of the present invention further includes a connecting tool 8 that can connect the outer needle hub 3 and the needle tip protection section 72. The connecting tool 8 has a structure in which the distal end is connected to the outer needle hub 3 and the proximal end is connected to the needle tip protection section 72. Preferably said connection is a mating or screwing. An example of a preferable structure of the connecting tool 8 is a structure in which a female screw portion 81 is formed at a distal end portion and a female screw portion 82 is formed at a base end portion, as shown in FIG. In the connecting tool 8 shown in FIG. 2, a female screw portion 81 provided at a distal end portion is screwed with a projection 31 provided at a proximal end portion of the outer needle hub 3, and a female screw portion provided at a proximal end portion is provided. 81 can be screwed with a projection 73 provided at the tip of the needle tip protection section 72. Another example of a preferable structure of the connecting member 8 is a structure in which an engaging claw 83 is formed at a distal end portion as shown in FIG.
The distal end of the connecting tool 8 needs to be detachably connected to the outer needle hub 3, but the connection between the base end and the needle tip protecting section 72 does not need to be detachable, and FIG. As shown in (2), the connecting tool 8 and the needle tip protection portion 72 may be fixed by bonding, welding, or the like.
[0020]
The connecting member 8 may be provided with a hydrophobic filter 84 for preventing blood leakage in a state where the inner needle 4 shown in FIG. 5 has been removed. The hydrophobic filter transmits air but does not transmit blood. Specifically, a sintered filter made of a synthetic resin such as polypropylene, polystyrene, or polymethyl methacrylate, or a nonwoven fabric is preferably used.
When the inner end of the connecting member 8 having the hydrophobic filter 84 fixed to the needle tip protection portion 72, the hydrophobic filter 84 is removed together with the needle tip protection portion 72 when the inner needle 4 is pulled out. Since it is detached from the needle hub 3, it is not preferable because it is impossible to prevent the blood that has entered the outer needle 2 from leaking. However, as shown in FIG. 6, the connecting tool 8 includes a first connecting tool 85 having a female screw 81 at a distal end and a hydrophobic filter 84 at a proximal end, and an engaging claw 83 at a distal end. And the base end is formed from two parts of the second connecting tool 86 fixed to the needle tip protection section 72, there is no problem of blood leakage. In the connecting tool 8 shown in FIG. 6, the engaging claw 83 provided at the distal end of the second connecting tool 86 can be directly and detachably fitted to the distal end of the first connecting tool 85.
[0021]
Before and during use of the indwelling needle assembly 1, that is, in a state where the needle tip 41 is not protected, as shown in FIGS. 1 and 2, the protector 7 includes at least one of the needle tip protection portions 72. The part is arranged in the inner needle hub cover 6. On the other hand, after using the indwelling needle assembly 1, the protector 7 is pushed by the finger of the medical worker holding the indwelling needle assembly 1 and slides toward the distal end, and as shown in FIG. The needle tip 41 is protected by the needle tip protection section 72.
[0022]
In the indwelling needle assembly 1, the protector 7 is provided at a position where the needle tip 41 is not protected, that is, at least a part of the needle tip protection portion 72 is disposed in the inner needle hub cover 6 as shown in FIG. Preferably, a first positioning means for positioning at a position to be performed is provided. The first positioning means can prevent the needle tip protection portion 72 from moving toward the distal end.
The first positioning means is, for example, as shown in FIG. 2, by fitting or engaging the distal end portion of the inner needle hub 5 with the needle tip protection portion 72. In this case, the outer diameter of the distal end portion of the inner needle hub 5 is smaller than the inner diameter of the needle tip protection portion 72, and the proximal end portion of the needle tip protection portion 72 is inserted into the distal end portion of the inner needle hub 5. It is preferable that it is in a state of being closed. As a specific example of the engagement between the inner needle hub 5 and the needle tip protection portion 72, a convex portion or a concave portion provided on the outer peripheral surface of the distal end portion of the inner needle hub 5, and the base portion of the needle tip protection portion 72. Engagement with a concave portion or a convex portion provided on the peripheral surface is exemplified.
[0023]
Further, it is preferable that the indwelling needle assembly 1 is provided with a second positioning means for positioning the protector 7 at a position where the needle tip 41 is protected. The second positioning means can prevent the protector 7 from moving toward the distal end and the proximal end, for example, by engagement between the proximal end of the protector 7 and the inner needle hub cover 6. .
Among the second positioning means, those which can prevent the protector 7 from moving toward the distal end include, for example, an engagement arm 74 provided at a base end of the protector 7 as shown in FIG. The inner needle hub cover 6 may be engaged with a portion forming the side hole 61. When the base end of the protector 7 is large enough not to pass through the side hole 61, the protector 7 functions to prevent the protector 7 from moving to the distal end side even if the engaging arm 74 is not provided. sell.
On the other hand, of the second positioning means that can prevent the protector 7 from moving to the proximal end side, for example, as shown in FIG. The protrusion 75 provided in the direction may be formed by engagement with the distal end portion of the inner needle hub cover 6.
[0024]
When the protector 7 is positioned at a position where the needle tip 41 is protected by the second positioning means, a protrusion 76 is provided on the inner peripheral surface of the distal end portion of the needle tip protection portion 72 of the protector 7. It is more preferable that the projection 76 engages with the needle tip 41 to prevent the needle tip 41 from protruding toward the distal end of the needle tip protection portion 72. When the protector body 71 is provided with a bent portion 77 that warps outward as shown in FIG. 4 or a curved portion (not shown) that is gently curved, the protrusion 76 and the needle tip 41 Engagement is more reliable and preferred.
[0025]
As a method of assembling the indwelling needle assembly 1 shown in FIGS. 1 and 2, first, the needle tip 41 of the inner needle 4 fixed to the tip of the inner needle hub 5 is attached to the needle tip protection portion 72 of the protector 7. The needle tip protection portion 72 is inserted into the lumen from the proximal end side, and is inserted outside the distal end portion of the inner needle hub 5. Next, the needle tip 41 of the inner needle 4 was inserted into the inner needle hub cover 6, and the inner needle hub cover 6 was moved to the proximal end until the inner needle hub cover 5 was joined to the inner needle hub 5 to form the side hole 61. It is arranged on the needle tip protection section 72 in this state. On the other hand, the proximal end of the outer needle hub 3 is connected to the distal end of the connector 8 in advance. The needle tip 41 of the inner needle 4 passes through the connecting tool 8 and the outer needle hub 3 and is inserted into the outer needle 2, and moves toward the distal end until the needle tip 41 projects from the distal end of the outer needle 2. Moved. Thereafter, the proximal end of the connecting tool 8 is connected to the distal end of the needle tip protection section 72, and the assembly of the indwelling needle assembly 1 is completed. At this time, the protector 7 is positioned by the first positioning means at a position where at least a part of the needle tip protection portion 72 is disposed in the inner needle hub cover 6. Is prevented from moving.
[0026]
As a method of using the indwelling needle assembly 1 shown in FIGS. 1 and 2, first, the indwelling needle assembly 1 assembled by the above-described assembling method is such that the needle tip 41 of the inner needle 4 projects from the tip of the outer needle 2. The patient's blood vessels are punctured in a state where the patient has been in a state of being injured. After the outer needle 2 is placed at a predetermined position in the blood vessel, the connection between the base end of the connecting device 8 and the needle tip protection portion 72 is released, and the inner needle 4 is pulled out of the outer needle 2. The outer needle 2 is left in the patient in the state shown in FIG. The protector 7 is slid toward the distal end of the inner needle 4 removed from the outer needle 4, and the needle tip 41 is stored in the needle tip protection part 72 as shown in FIG. With the outer needle 2 placed in the patient, the connection between the distal end of the connector 8 and the proximal end of the outer needle hub 3 is released, and a desired line is connected to the proximal end of the outer needle hub 3. used. On the other hand, as a method of using the indwelling needle assembly 1 shown in FIG. 6, the needle 41 of the inner needle 4 is pierced into a blood vessel of a patient in a state of protruding from the distal end of the outer needle 2, and the outer needle 2 is inserted After being arranged at a predetermined position in the inside, the connection between the distal end portion of the second connecting member 86 and the first connecting member 8 is released, and the inner needle 4 is pulled out of the outer needle 2. With the inner needle 4 removed from the outer needle 4, the protector 7 is slid toward the distal end together with the second connector 86, and is stored in the needle tip 41 needle tip protection part 72. The outer needle 2 placed in the patient is disconnected from the distal end of the first connector 8 and the proximal end of the outer needle hub 3, and a desired line is connected to the proximal end of the outer needle hub 3. Being used.
[0027]
When the indwelling needle assembly 1 of the present invention is sold in a state where the needle tip 41 as shown in FIGS. 1, 2 and 6 is not protected, a cap (not shown) capable of protecting the needle tip 41 is provided. ) Is preferably provided. In use, the indwelling needle assembly 1 is used with the cap removed.
[0028]
【The invention's effect】
The indwelling needle assembly of the present invention uses the connecting tool that can directly connect the outer needle hub and the protector of the protector, so that the outer needle and the inner needle are securely fixed, and the indwelling needle assembly is There is no risk of affecting the operation of. Further, the indwelling needle assembly of the present invention does not need to change the shape of the outer needle hub in order to ensure the fixation of the inner needle and the outer needle, so that the conventional infusion line or the like can be directly connected and used. it can.
[Brief description of the drawings]
FIG. 1 is an upper side view showing a state before protection of a needle tip in one embodiment of an indwelling needle assembly of the present invention.
FIG. 2 is a cross-sectional view taken along line AA of the indwelling needle assembly shown in FIG.
FIG. 3 is a sectional view of the indwelling needle assembly shown in FIG. 2 taken along line BB.
FIG. 4 is a longitudinal sectional view showing a state of the indwelling needle assembly shown in FIG. 2 after protection of a needle tip.
5 is a longitudinal sectional view showing a part of the indwelling needle assembly shown in FIG. 2 which is to be indwelled in the body of a patient.
FIG. 6 is an upper side view showing a state before protection of a needle tip in another embodiment of the indwelling needle assembly of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 indwelling needle assembly 2 outer needle 3 outer needle hub 4 inner needle 41 needle tip 5 inner needle hub 6 inner needle hub cover 61 side hole 7 protector 71 protector body 72 needle tip protection section 8

Claims (9)

生体組織に穿刺され留置される外針、前記外針が先端部に固着された外針ハブ、該外針の内腔に挿通可能であって先端部に鋭利な針先を有する内針、前記内針が先端部に固着された内針ハブ、前記内針ハブの先端部に接合して内針ハブの外部と内部を連通しうる側孔を形成しうる筒状の内針ハブカバー、細長い棒状の本体と前記本体の先端側に設けられた前記内針の針先を保護しうる針先保護部とを有するプロテクター、および前記外針ハブと前記針先保護部とを連結しうる連結具からなる留置針組立体であって、前記プロテクターの本体は前記側孔内に摺動可能に挿通され、前記針先保護部は前記内針上に摺動可能に配置され、前記内針ハブカバーは前記針先保護部の少なくとも一部を収容しうる形状を有してなる留置針組立体。An outer needle that is punctured and placed in a living tissue, an outer needle hub to which the outer needle is fixed at a distal end, an inner needle that can be inserted into a lumen of the outer needle and has a sharp needle tip at the distal end, An inner needle hub having an inner needle fixed to a distal end thereof; a cylindrical inner needle hub cover capable of forming a side hole which can be connected to the distal end of the inner needle hub to allow communication between the outside and the inside of the inner needle hub; A protector having a main body and a needle tip protection portion provided on the tip side of the main body and capable of protecting the needle tip of the inner needle, and a connector capable of connecting the outer needle hub and the needle tip protection portion. An indwelling needle assembly, wherein the body of the protector is slidably inserted into the side hole, the needle tip protection portion is slidably disposed on the inner needle, and the inner needle hub cover is An indwelling needle assembly having a shape capable of accommodating at least a part of the needle tip protection portion. 前記連結具は、先端部が嵌合または螺合により前記外針ハブの基端部に接続され、基端部が嵌合または螺合により前記針先保護部の先端部に接続されてなる請求項1記載の留置針組立体。The connecting tool has a distal end connected to a proximal end of the outer needle hub by fitting or screwing, and a proximal end connected to a distal end of the needle tip protecting section by fitting or screwing. Item 2. The indwelling needle assembly according to Item 1. 前記連結具は、両端に雌ねじ部を有してなり、先端側雌ねじ部が螺合により前記外針ハブの基端部に接続され、基端側雌ねじ部が螺合により前記針先保護部の先端部に接続されてなる請求項2記載の留置針組立体。The coupling tool has female screw portions at both ends, a distal female screw portion is connected to a proximal end of the outer needle hub by screwing, and a proximal female screw portion of the needle tip protection portion is screwed. 3. The indwelling needle assembly according to claim 2, which is connected to a distal end portion. 前記連結具は、基端部が前記針先保護部の先端部に固着されてなる請求項1〜3のいずれかに記載の留置針組立体。The indwelling needle assembly according to any one of claims 1 to 3, wherein a base end of the connecting member is fixed to a distal end of the needle tip protection portion. 前記留置針組立体は、前記針先保護部の少なくとも一部が内針ハブカバー内に配置される位置で前記プロテクターを位置決めしうる第一位置決め手段を備えてなる請求項1〜4のいずれかに記載の留置針組立体。5. The indwelling needle assembly according to claim 1, further comprising a first positioning unit configured to position the protector at a position where at least a part of the needle tip protection unit is disposed in an inner needle hub cover. 6. The indwelling needle assembly according to any one of the preceding claims. 前記第一位置決め手段は、前記内針ハブの先端部と、前記プロテクターの針先保護部との係合によるものである請求項5記載の留置針組立体。6. The indwelling needle assembly according to claim 5, wherein the first positioning means is formed by engagement of a distal end portion of the inner needle hub with a needle tip protection portion of the protector. 前記留置針組立体は、前記針先保護部が前記内針の針先を保護しうる位置で前記プロテクターを位置決めしうる第二位置決め手段を備えてなる請求項1〜6のいずれかに記載の留置針組立体。The said indwelling needle assembly is provided with the 2nd positioning means which can position the said protector in the position which the said needle-point protection part can protect the needle-point of the said inner needle, The Claim in any one of Claims 1-6. Indwelling needle assembly. 前記第二位置決め手段は、前記プロテクターの基端部と内針ハブカバーとの係合によるものである請求項7記載の留置針組立体。The indwelling needle assembly according to claim 7, wherein the second positioning means is formed by engagement between a base end portion of the protector and an inner needle hub cover. さらに、針先を保護するためのキャップを備えた請求項1〜8のいずれかに記載の留置針組立体。The indwelling needle assembly according to any one of claims 1 to 8, further comprising a cap for protecting the needle tip.
JP2003059619A 2003-03-06 2003-03-06 Indwelling needle assembly Pending JP2004267323A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007229311A (en) * 2006-03-02 2007-09-13 Nipro Corp Connection retaining member, fixing auxiliary component and connection retaining set
JP2009514565A (en) * 2005-09-30 2009-04-09 アースキン メディカル エルエルシー Needle-type medical device including a needle guide and method for assembling the same
JP2012521825A (en) * 2009-03-31 2012-09-20 サノフィ−アベンティス・ドイチュラント・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング Drug delivery device
JP2021183158A (en) * 2015-10-30 2021-12-02 シー・アール・バード・インコーポレーテッドC R Bard Incorporated Scoring balloon with translating scoring wires

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009514565A (en) * 2005-09-30 2009-04-09 アースキン メディカル エルエルシー Needle-type medical device including a needle guide and method for assembling the same
JP2007229311A (en) * 2006-03-02 2007-09-13 Nipro Corp Connection retaining member, fixing auxiliary component and connection retaining set
JP2012521825A (en) * 2009-03-31 2012-09-20 サノフィ−アベンティス・ドイチュラント・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング Drug delivery device
JP2021183158A (en) * 2015-10-30 2021-12-02 シー・アール・バード・インコーポレーテッドC R Bard Incorporated Scoring balloon with translating scoring wires
JP7324806B2 (en) 2015-10-30 2023-08-10 シー・アール・バード・インコーポレーテッド Scoring balloon with translational scoring wire
US11771457B2 (en) 2015-10-30 2023-10-03 C.R. Bard, Inc. Scoring balloon with translating scoring wires

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