[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

JP3704918B2 - Double needle with anti-puncture function - Google Patents

Double needle with anti-puncture function Download PDF

Info

Publication number
JP3704918B2
JP3704918B2 JP31595897A JP31595897A JP3704918B2 JP 3704918 B2 JP3704918 B2 JP 3704918B2 JP 31595897 A JP31595897 A JP 31595897A JP 31595897 A JP31595897 A JP 31595897A JP 3704918 B2 JP3704918 B2 JP 3704918B2
Authority
JP
Japan
Prior art keywords
needle
locking portion
tip
double
outer needle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP31595897A
Other languages
Japanese (ja)
Other versions
JPH11128346A (en
Inventor
吉輔 寺岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JMS Co Ltd
Original Assignee
JMS Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JMS Co Ltd filed Critical JMS Co Ltd
Priority to JP31595897A priority Critical patent/JP3704918B2/en
Publication of JPH11128346A publication Critical patent/JPH11128346A/en
Application granted granted Critical
Publication of JP3704918B2 publication Critical patent/JP3704918B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は医療器具に関し、特に、患者の皮膚を刺すための尖った遠位端を有する中空針に関する。
【0002】
【従来の技術】
従来より、医師や看護婦等の医療業務に携わるものが血液検査等の際に使用した針を細長い円筒状等のホルダ−内に収納する際に誤って自からを刺してしまうことがありその穿刺を原因として特殊ウイルスに感染することが懸念されている。そのため誤穿刺防止機能を備えた注射器等が開発されている。例えば、使用後の針を注射器のハウジング内に引き込める注射器、注射器の外筒に摺動自在に装着されたスリ−ブを使用後の注射針を囲繞するように構成された注射器等があるが構造が複雑でありコスト高や製造の困難さを伴う問題がある。このような不利益を解決するものとして特開平7−255848号公報に記載のものがある。
【0003】
該公報に記載のものは、図8に示すような、概ね遠位端の尖った中空針51と、該中空針51の内腔を往復運動可能に取り付けられた鈍い先端を有するロッド52とハウジング53とから構成されている。この2重針50は、2重針50が患者の血管内に位置決めされているときはロッド52の先端が中空針51の内腔に位置しており、患者から針を抜いた後は、2重針50の針基54を注射器外筒の先端のテーパー部55から取り外し、図9に示すようにハウジング53の基端を越えて伸びるストライカ−56を何かに打ち付けて中空針51の内腔に位置するロッド52の先端が中空針51の先端を越えて伸びるようになっている。かくして、中空針51の鋭利な先端が鈍い先端を有するロッド52により保護され、使用者の不注意による誤穿刺を防止するようになっている。
【0004】
【発明が解決しようとする課題】
しかしながら、上記のものでは、中空針51の針基55を注射器の先端テーパー部55から取り外した後でなければ、中空針51の鋭利な先端は保護され得ず、取扱いが煩雑であり操作性も良くない。
【0005】
本発明の目的は、構造が単純でコスト安、かつ操作性が良好な2重針、および該注射針を装着した注射器を提供するものである。
【0006】
【課題を解決するための手段】
すなわち本発明は、鈍い先端を有する中空円柱状の内針と、該内針の外周に外装され、内針先端を囲繞する位置から、内針の先端を露出可能な引き込み位置まで摺動可能な中空円柱状外針とからなり、前記内針および外針の基端部に、前記外針が囲繞する位置と引き込み位置に係止可能な係止部を備えた2重針において、前記内針の針基が注射器に連結されたまま、外針が囲繞する位置から引き込み位置にスライドすることを特徴とする2重針。
【0007】
尚、本明細書中においては、原則「基端」とは、操作する手元に近い側のことであり、「先端」とは、手元から遠い側のことであって、各構成部材に共通して使用する。
【0008】
また、本発明で使用する「外針の鋭利な先端が保護される]の「保護]とは、外針の鋭利な先端に長手方向から接触できないようにされ、物を穿刺しにくい状態におかれることを意味する。
【0009】
以下に、外針が「内針先端を囲繞する位置」については「囲繞位置」と、「内針の先端を露出可能な引き込み位置」を「引き込み位置」と略して使用する。
【0010】
また、本発明では「逆テーパー部」は針基のテーパーと逆方向の勾配を有する場合に使用され、「正テーパー部」は針基のテーパーと同方向の勾配を有する場合に使用される。
【0011】
【発明の実施の形態】
以下、本発明の注射針の実施の形態を示すが、これらに限定されるものではない。
【0012】
本発明の特徴は、内針の針基が注射器の先端テ−パ−部に接続された状態で外針を基端方向にスライドさせることにより外針の鋭利な先端が保護される構成としたことにある。該構成により、外針の鋭利な先端を、2重針を外筒の先端から取り外ずす前に保護することができるので、操作性が良好となり、また、構造がきわめてシンプルであるので、製造が容易、且つコスト安となる利点を有するものである。
【0013】
以下、図面を用いて詳細に説明する。
【0014】
図1に示すように、本発明の2重針は、概ね、内針2と、該内針2の外周に外装される外針3とから構成される。
【0015】
図3に示すように内針2は、その基端部に基端方向に向かって拡径し、その後端部周縁にわずかな凸状部5を有する針基4が設けられ、該針基4の先端側に、鈍い先端を有する中空の筒上部材6が嵌入または接着されてなるものである。針基4は針基の長さに対し6/100のテ−パ−を有する厚生省告示第412号に規定の注射針基準に適合するものである。
【0016】
針基4の先端側には、隣接あるいは連続して、後述する外針3を「囲繞位置」および「引き込み位置」に係止するための手段としての係止可能な係止部7が設けられている。
【0017】
係止部7は、その形状について特に限定されるものではないが、後述する外針3の係止部8の内腔と相互に係止可能な形状となっている。
【0018】
内針2の係止部7及び外針3の係止部8による係止は、例えば、内針2の係止部7の外周面と外針3の係止部8の内腔の内壁に設けられた雄雌ネジの螺合による場合がある。この場合、係止部8の内腔に設けられたネジの基端側の端部が、内針2のネジの先端側の端部に当接した際に、外針3が「囲繞位置」に係止され、外針3のネジの基端側の端部が内針2のネジの基端側の端部に当接した際に、外針3が「引き込み位置」に係止されるように設ける。
【0019】
その他の例として、内針2の外周面に凸状突起が基端側と先端側に実質離れて設けられ、該凸状突起に対応した凹状溝が外針3の係止部8の内腔内壁に設けられて、前記凸状突起と凹状溝とが可逆的に嵌合されることにより係止されるようにしてもよい。即ち、外針3の係止部の基端側の凹状溝と内針2の係止部の先端側凸状突起が嵌合することにより外針3は「囲繞位置」に係止され、外針3係止部の基端側の凹状溝と内針3の係止部基端側の凸状突起とが嵌合することにより外針3は「引き込み位置」に係止されように設ける。
【0020】
その他の例として、図4及び図3に示すように、外針3の係止部8の内腔の基端側には隆起部11が設けられ、係止部8の先端側81の内壁83は先端方向に向かって縮径されている。一方、内針2の係止部7の外周には、先端方向に拡径され勾配を形成する逆テーパ−部73と、該逆テーパ−部73より先端側に設けられ、先端方向に縮径され勾配を形成する正テーパ−部78が設けられている。
前記逆テーパ−部73と外針3の前記隆起部11の摩擦係合により外針3は「囲繞位置」に係止され、内針2の前記正テーパ−部78と外針3の前記内壁81の摩擦係合により外針3は「引き込み位置」に係止されるようになっている。
【0021】
しかしながら、本発明の2重針の係止部7、8は上記の形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で、従来より知られる係止方法のいずれの形態であっても良い。また内針の係止部7は、針基4と一体的に成形されたものであってもよく、また別体であってもよい。
【0022】
図4に示めすように外針3は、外針3を摺動させる際に指により把持可能な係止部8を有しており、係止部8の先端に、患者の皮膚を刺すための鋭利な先端を有する中空の筒上部材9が嵌入または接着されている。基端部8の内腔は、前記内針2の係止部7と相互に係止可能な形状となっている。
【0023】
上記に記載の構成を有する本発明の2重針は、以下のように機能する。
【0024】
図1に示すように、上記の係止部7、8により「引き込み位置」に係止された外針の鋭利な先端91は、内針の筒上部材6の途中に位置しており、外針3の鋭利な先端91が長手方向から最初に接触できないようにされ、穿刺しにくいようになっている。また係止部7により係止されて、外針3が容易に先端方向にスライドしないようになっており、外針の鋭利な先端91が再露出されるのを防止している。
【0025】
図2に示すように、上記の係止部7、8により「囲繞位置」に係止された外針3は、その鋭利な先端91が露出され、人に穿刺可能な状態にある。また係止部7、8により係止されて、使用中に外針3が基端方向にスライドするのを防止している。
【0026】
内針2および外針3の中空の筒上部材6、9材質は、ステンレス製である。
【0027】
内針2の針基4および係止部7、外針3の係止部8の材質は、吸引、排出される薬液や血液の状態を外部より目視できるように可能なかぎり透明な合成樹脂製であるのが好ましく、例えば、ポリカーボネート、ポリスチレン、ポリプロピレン、ポリメチルペンテン等の合成樹脂製であるのが好ましい。
【0028】
次に、図1および図2を用いて本発明の2重針の使用方法について詳細に説明する。
【0029】
本発明の2重針は、ブリスタ−包装等のように通常の注射針と同様な包装形態(図示せず)で包装されるものである。開封された際の2重針は、細長い円筒状等のホルダ−内に収納されている(図示せず)。
【0030】
外針3の先端は図1に示すように「引き込み位置]にあり、外針3の先端91は内針2の中空筒状体6によって保護されている。
【0031】
図1に示すように本発明の2重針の内針2の針基4を注射器の先端のテ−パ−部14に接続し、「引き込み位置」にある外針2を先端方向にスライドさせて、図2に示すように、外針2の先端91を露出させ、「囲繞位置」に一端係止する。外針3の鋭利な先端91をバイアル瓶等の栓体に刺入し、バイアル瓶内の薬液を吸引するために注射器外筒内の内筒(図示せず)を基端方向に引くと、薬液が外針3の先端91および内針2の中空筒状体6の内腔を経て注射器の外筒内に薬液が充填される。薬液の充填完了後、外針3を患者の皮膚に穿刺し、外筒内の薬液が内針2の中空筒状体6の内腔から外針3の中空筒状体9の内腔を経て患者に投与される。使用後、外針3を患者の皮膚から抜きとり、外針3の係止部8を内針2の基端方向にスライドさせる。すると、内針2の鈍い先端21が外針3の先端を越えて伸び、外針3の係止部8は、内針の係止部7と係止され、外針3は「引き込み位置」に係止される。その後、2重針は細長い円筒状等のホルダ−により囲繞され、内針2の針基4を注射器の先端テーパー部14より引き抜かれ、廃棄される。 このようにして、外針3の鋭利な先端91は、内針2に保護されて、これにより使用済みの注射針の誤穿刺を防止することができる。
【0032】
【実施例】
以下に本発明の2重針の一実施例について、図面を用いてより詳細に説明する。 図1は本発明の2重針の外針が「引き込み位置」にある際の正面断面図、図2は本発明の2重針の外針が「囲繞位置」にある際の正面断面図、図3は本発明の2重針の内針の正面断面図、図4は本発明の2重針の外針の正面断面図、図5は本発明の2重針の内針の係止部を示す拡大断面図である。図6は、図1に示す本発明の2重針の係止部の拡大図であり、図7は、図2に示す本発明の2重針の係止部の拡大図である。
【0033】
図1および図2に示すように、本発明の2重針は、内針2および外針3とから構成されている。
【0034】
図3に示すように、内針2は、その基端部に基端方向に向かって拡径し、その後端部周縁にわずかな凸状部5を有するポリカーボネート製の針基4が設けられ、該針基4の先端側に、鈍い先端を有するステンレス製の中空の筒上部材6が嵌入されている。針基4の先端には針基4とー体成型により形成された係止部7が設けられている。
【0035】
図3に示すように、内針2の係止部7は針基4の先端より縮径されて設けられた第1係止部71と該第1係止部71よりさらに縮径されて設けられた第2係止手部72とから構成されている。
【0036】
図5に示すように、第1係止部71は、概ね同一径の中空円筒形状の部分74と、その先端付近から先端に向かって徐々に拡径されており、前記針基4のテーパーと逆勾配を有する逆テーパー部73と、該逆テーパー部73から先端方向にむかって概ね水平な面77とから構成されている。
【0037】
第2係止部72は、基端側に概ね水平な面79が形成され、その先に前記針基4のテーパーと同方向の勾配を有する正テーパ−部78を形成が形成されている。 図4に示すように、外針3は、外針3を摺動させる際に指により把持可能な係止部8を有しており、係止部8の先端には、患者の皮膚を刺すための鋭利な先端91を有する中空の筒上部材9が嵌入されている。係止部8の先端側81の内腔の基端側は、概ね前記第2係止手段72の基端側の外径とほぼ同一の径であり、先端方向に向かって徐々に縮径されている。係止部8基端側82の内腔は概ね、第1係止手段71の中空円筒形状の部分74の外径とほぼ同一径であり、その最も基端側には環状の隆起部11が形成されている。該隆起部11は、図7に示すようにテーパー部111とそれに連続してフラット部112を有してしている。 図6に示すように、外針3の「引き込み位置」への係止は、前記内針2の第2の係止部72の正テーパー部78に外針3の係止部8の先端側81の縮径された内壁83とが、摩擦係合することによりなされる。前記外針3の係止部8の先端側内壁83が基端方向にスライドされるにつれて、テーパー部78と徐々にその摩擦力を大きくさせながら摩擦係合により係止されるようになっている。この摩擦係合による係止により、「引き込み位置」へ係止された外針3が容易に先端方向にスライドするのを防止している。
【0038】
図7に示すように、外針3の「囲繞位置」への係止は、外針3の係止部8の基端側82の内壁に設けられた環状の隆起部11が、第1係止部71の逆テーパー部73が先端方向にスライドされ、隆起部11のテーパー部111と逆テーパー部73とが徐々にその摩擦力を大きくさせながら摩擦係合により係止されることにより行われるようになっている。この摩擦係合による係止により、外針が基端側にスライドするのを防止すると伴に、先端方向にスライドする外針3が内針2と分離するのを防止している。
【0039】
【発明の効果】
本発明は上記とおり、針基と注射器の先端のテーパー部とが連結されたままで、内針により鋭利な先端を有する外針を保護することが可能であるので、処置(注射)終了直後から安全性が確保でき、取扱いが煩雑とならず操作性が良好な注射針を提供できる。また構造が極めて単純であるので製造が容易であり、コストの安い注射針を提供できる。本発明の2重針は、既存のシリンジに適用可能であり、シリンジ本体の設計変更を伴うことなく、誤穿刺防止機能を有する注射器を提供することができる。
【図面の簡単な説明】
【図1】本発明の2重針の外針が「引き込み位置」にある際を示す正面断面図である。
【図2】本発明の2重針の外針が「囲繞位置」にある際を示す正面断面図である。
【図3】本発明の2重針の内針を示す正面断面図である。
【図4】本発明の2重針の外針を示す正面断面図である。
【図5】本発明の2重針の内針の係止手段を示す拡大断面図である。
【図6】図1に示す本発明の2重針の係止部の拡大図である。
【図7】図2に示す本発明の2重針の係止部の拡大図である。
【図8】従来の2重針の断面図である。
【図9】従来の2重針の正面図である。
【符号の説明】
2 内針
3 外針
4 針基
5 凸状部
6 中空筒状体
61 鈍い先端
7 係止部
71 第1係止部
72 第2係止部
73 逆テーパー部
74 同一径の円筒筒状形の部分
77 水平な面
78 正テーパー部
79 水平な面
80 急な勾配
8 係止部
81 係止部8の先端側
82 係止部8の基端側
83 係止部8の先端側の縮径された内壁
9 中空筒状体
91 鋭利な先端
11 隆起部
111 テーパー部
112 フラット部
50 2重針
51 中空針
52 ロッド
53 ハウジング
55 テーパー部
56 ストライカ−
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to medical devices, and in particular, to a hollow needle having a pointed distal end for piercing a patient's skin.
[0002]
[Prior art]
Conventionally, those involved in medical work such as doctors and nurses may accidentally stab themselves when storing needles used in blood tests etc. in a long cylindrical holder There is concern about infection with special viruses due to puncture. For this reason, syringes and the like having an erroneous puncture prevention function have been developed. For example, there are a syringe that can retract a used needle into a housing of a syringe, a syringe that is configured to surround a used syringe needle with a sleeve that is slidably mounted on an outer cylinder of the syringe, and the like. There is a problem that the structure is complicated, and the cost is high and the manufacturing is difficult. Japanese Patent Laid-Open No. 7-255848 discloses a solution to such a disadvantage.
[0003]
As shown in FIG. 8, a hollow needle 51 having a generally distal end as shown in FIG. 8, a rod 52 having a blunt tip attached so as to be able to reciprocate in the lumen of the hollow needle 51, and a housing 53. When the double needle 50 is positioned in the blood vessel of the patient, the tip of the rod 52 is positioned in the lumen of the hollow needle 51. After the needle is removed from the patient, the double needle 50 is The needle base 54 of the heavy needle 50 is removed from the tapered portion 55 at the distal end of the syringe outer cylinder, and a striker 56 extending beyond the base end of the housing 53 is struck to something as shown in FIG. The tip of the rod 52 located at the end extends beyond the tip of the hollow needle 51. Thus, the sharp tip of the hollow needle 51 is protected by the rod 52 having a blunt tip, and erroneous puncture due to carelessness of the user is prevented.
[0004]
[Problems to be solved by the invention]
However, in the above, the sharp tip of the hollow needle 51 cannot be protected unless the needle base 55 of the hollow needle 51 is removed from the tip tapered portion 55 of the syringe. Not good.
[0005]
An object of the present invention is to provide a double needle with a simple structure, low cost, and good operability, and a syringe equipped with the injection needle.
[0006]
[Means for Solving the Problems]
That is, the present invention is a hollow cylindrical inner needle having a blunt tip, and is slidable from a position surrounding the inner needle tip to a retracted position where the tip of the inner needle can be exposed. A double needle comprising a hollow cylindrical outer needle, and having a locking portion that can be locked at a position surrounding the outer needle and a retracted position at a proximal end portion of the inner needle and the outer needle; A double needle that slides from a position surrounding the outer needle to a retracted position while the needle base is connected to the syringe.
[0007]
In this specification, in principle, the “base end” is the side closer to the hand to be operated, and the “tip” is the side far from the hand and is common to each component. To use.
[0008]
The “protection” of “the sharp tip of the outer needle is protected” used in the present invention means that the sharp tip of the outer needle cannot be contacted from the longitudinal direction, and it is difficult to puncture an object. It means being.
[0009]
Hereinafter, the “position where the outer needle surrounds the tip of the inner needle” will be used as “the surrounding position” and “the pull-in position where the tip of the inner needle can be exposed” will be abbreviated as “the pull-in position”.
[0010]
In the present invention, the “reverse taper portion” is used when it has a gradient in the direction opposite to the taper of the needle base, and the “forward taper portion” is used when it has a gradient in the same direction as the taper of the needle base.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, although the embodiment of the injection needle of the present invention is shown, it is not limited to these.
[0012]
A feature of the present invention is that the sharp tip of the outer needle is protected by sliding the outer needle in the proximal direction with the needle base of the inner needle connected to the tip taper portion of the syringe. There is. With this configuration, the sharp tip of the outer needle can be protected before the double needle is removed from the tip of the outer cylinder, so that the operability is good and the structure is extremely simple. It has the advantage of easy manufacture and low cost.
[0013]
Hereinafter, it explains in detail using a drawing.
[0014]
As shown in FIG. 1, the double needle of the present invention is generally composed of an inner needle 2 and an outer needle 3 that is sheathed on the outer periphery of the inner needle 2.
[0015]
As shown in FIG. 3, the inner needle 2 is provided with a needle base 4 having a diameter that is increased in the proximal direction toward the proximal direction and a slight convex portion 5 on the periphery of the rear end. A hollow tubular member 6 having a blunt tip is fitted or bonded to the tip side of the sleeve. The needle base 4 conforms to the needle standard prescribed in Ministry of Health and Welfare Notification No. 412 having a taper of 6/100 with respect to the length of the needle base.
[0016]
On the distal end side of the needle base 4, a locking portion 7 that can be locked as a means for locking the outer needle 3 to be described later at a “go position” and a “retraction position” is provided adjacently or continuously. ing.
[0017]
The locking portion 7 is not particularly limited in its shape, but has a shape that can be locked with a lumen of a locking portion 8 of the outer needle 3 described later.
[0018]
Locking by the locking portion 7 of the inner needle 2 and the locking portion 8 of the outer needle 3 is performed, for example, on the outer peripheral surface of the locking portion 7 of the inner needle 2 and the inner wall of the lumen of the locking portion 8 of the outer needle 3. There may be a case where the male and female screws provided are screwed together. In this case, when the end on the proximal end side of the screw provided in the inner cavity of the locking portion 8 comes into contact with the end on the distal end side of the screw of the inner needle 2, the outer needle 3 is in the “go position”. The outer needle 3 is locked at the “retraction position” when the proximal end of the screw of the outer needle 3 comes into contact with the proximal end of the screw of the inner needle 2. Provide as follows.
[0019]
As another example, convex protrusions are provided on the outer peripheral surface of the inner needle 2 so as to be substantially separated from the proximal end side and the distal end side, and a concave groove corresponding to the convex protrusion is the lumen of the locking portion 8 of the outer needle 3. It may be provided on the inner wall and locked by reversibly fitting the convex protrusion and the concave groove. That is, when the concave groove on the proximal end side of the locking portion of the outer needle 3 and the convex protrusion on the distal end side of the locking portion of the inner needle 2 are fitted, the outer needle 3 is locked at the “go position”. The outer needle 3 is provided to be locked at the “retracted position” by fitting the concave groove on the proximal end side of the needle 3 locking portion with the convex protrusion on the locking portion proximal end side of the inner needle 3.
[0020]
As another example, as shown in FIGS. 4 and 3, a raised portion 11 is provided on the proximal end side of the lumen of the locking portion 8 of the outer needle 3, and an inner wall 83 on the distal end side 81 of the locking portion 8. Is reduced in diameter toward the tip. On the other hand, on the outer periphery of the locking portion 7 of the inner needle 2, a reverse tapered portion 73 that is enlarged in the distal direction and forms a gradient, and provided on the distal side from the reverse tapered portion 73, the diameter is reduced in the distal direction. A positive taper portion 78 is formed to form a gradient.
The outer needle 3 is locked at the “go position” by frictional engagement between the reverse tapered portion 73 and the raised portion 11 of the outer needle 3, and the forward tapered portion 78 of the inner needle 2 and the inner wall of the outer needle 3. The outer needle 3 is locked at the “retraction position” by the frictional engagement of 81.
[0021]
However, the locking portions 7 and 8 of the double needle of the present invention are not limited to the above-described form, and may be any form of a conventionally known locking method without departing from the gist of the present invention. May be. Further, the inner needle locking portion 7 may be formed integrally with the needle base 4 or may be a separate body.
[0022]
As shown in FIG. 4, the outer needle 3 has a locking portion 8 that can be gripped by a finger when the outer needle 3 is slid, and the patient's skin is pierced at the tip of the locking portion 8. A hollow tubular member 9 having a sharp tip is inserted or bonded. The lumen of the base end portion 8 has a shape that can be locked with the locking portion 7 of the inner needle 2.
[0023]
The double needle of the present invention having the configuration described above functions as follows.
[0024]
As shown in FIG. 1, the sharp tip 91 of the outer needle locked in the “retraction position” by the locking portions 7 and 8 is located in the middle of the cylinder upper member 6 of the inner needle, The sharp tip 91 of the needle 3 is prevented from first contacting from the longitudinal direction, and is difficult to puncture. Further, the outer needle 3 is locked by the locking portion 7 so that the outer needle 3 does not easily slide in the distal direction, and the sharp tip 91 of the outer needle is prevented from being reexposed.
[0025]
As shown in FIG. 2, the outer needle 3 locked in the “go position” by the locking portions 7 and 8 is exposed to the sharp tip 91 and is in a state that can be punctured by a person. Further, the outer needle 3 is locked by the locking portions 7 and 8 to prevent the outer needle 3 from sliding in the proximal direction during use.
[0026]
The hollow cylindrical upper members 6 and 9 of the inner needle 2 and the outer needle 3 are made of stainless steel.
[0027]
The material of the needle base 4 and the locking portion 7 of the inner needle 2 and the locking portion 8 of the outer needle 3 is made of a synthetic resin that is as transparent as possible so that the state of the sucked and discharged drug solution and blood can be visually observed from the outside. For example, it is preferably made of a synthetic resin such as polycarbonate, polystyrene, polypropylene, or polymethylpentene.
[0028]
Next, the method of using the double needle of the present invention will be described in detail with reference to FIGS.
[0029]
The double needle of the present invention is packaged in a packaging form (not shown) similar to a normal injection needle, such as blister packaging. When opened, the double needle is housed in an elongated cylindrical holder (not shown).
[0030]
The distal end of the outer needle 3 is in the “retraction position” as shown in FIG. 1, and the distal end 91 of the outer needle 3 is protected by the hollow cylindrical body 6 of the inner needle 2.
[0031]
As shown in FIG. 1, the needle base 4 of the inner needle 2 of the double needle of the present invention is connected to the taper portion 14 at the distal end of the syringe, and the outer needle 2 at the “retraction position” is slid in the distal direction. Then, as shown in FIG. 2, the tip 91 of the outer needle 2 is exposed and locked to the “go position” at one end. When the sharp tip 91 of the outer needle 3 is inserted into a stopper such as a vial, and an inner tube (not shown) in the syringe outer tube is pulled in the proximal direction in order to suck the drug solution in the vial, The medicinal solution is filled into the outer cylinder of the syringe through the distal end 91 of the outer needle 3 and the lumen of the hollow cylindrical body 6 of the inner needle 2. After the filling of the medicinal solution is completed, the outer needle 3 is punctured into the patient's skin, and the medicinal solution in the outer cylinder passes from the lumen of the hollow cylindrical body 6 of the inner needle 2 through the lumen of the hollow cylindrical body 9 of the outer needle 3. Administered to patients. After use, the outer needle 3 is removed from the patient's skin, and the locking portion 8 of the outer needle 3 is slid in the proximal direction of the inner needle 2. Then, the blunt tip 21 of the inner needle 2 extends beyond the tip of the outer needle 3, the locking portion 8 of the outer needle 3 is locked with the locking portion 7 of the inner needle, and the outer needle 3 is in the “retraction position”. It is locked to. Thereafter, the double needle is surrounded by an elongated cylindrical holder, and the needle base 4 of the inner needle 2 is pulled out from the tip tapered portion 14 of the syringe and discarded. In this way, the sharp tip 91 of the outer needle 3 is protected by the inner needle 2, thereby preventing erroneous use of the used injection needle.
[0032]
【Example】
Hereinafter, an embodiment of the double needle of the present invention will be described in more detail with reference to the drawings. 1 is a front sectional view when the outer needle of the double needle of the present invention is in the “retracted position”, and FIG. 2 is a front sectional view of the outer needle of the double needle of the present invention in the “go position”. 3 is a front cross-sectional view of the inner needle of the double needle of the present invention, FIG. 4 is a front cross-sectional view of the outer needle of the double needle of the present invention, and FIG. 5 is a locking portion of the inner needle of the double needle of the present invention. FIG. 6 is an enlarged view of the locking portion of the double needle of the present invention shown in FIG. 1, and FIG. 7 is an enlarged view of the locking portion of the double needle of the present invention shown in FIG.
[0033]
As shown in FIGS. 1 and 2, the double needle of the present invention includes an inner needle 2 and an outer needle 3.
[0034]
As shown in FIG. 3, the inner needle 2 is provided with a polycarbonate needle base 4 having a diameter that is increased in the proximal direction toward the proximal direction and a slight convex portion 5 on the periphery of the rear end. A stainless steel hollow cylindrical member 6 having a blunt tip is fitted on the tip side of the needle base 4. At the distal end of the needle base 4, a locking portion 7 formed by molding the needle base 4 and the body is provided.
[0035]
As shown in FIG. 3, the locking portion 7 of the inner needle 2 is provided with a first locking portion 71 having a diameter reduced from the tip of the needle base 4 and a diameter further reduced than the first locking portion 71. The second locking hand portion 72 is formed.
[0036]
As shown in FIG. 5, the first locking portion 71 has a hollow cylindrical portion 74 having substantially the same diameter, and the diameter of the first locking portion 71 gradually increases from the vicinity of the tip toward the tip. A reverse taper portion 73 having a reverse gradient and a substantially horizontal surface 77 from the reverse taper portion 73 toward the distal end are formed.
[0037]
The second locking portion 72 has a generally horizontal surface 79 formed on the proximal end side, and a forward tapered portion 78 having a gradient in the same direction as the taper of the needle base 4 is formed at the tip. As shown in FIG. 4, the outer needle 3 has a locking portion 8 that can be gripped by a finger when the outer needle 3 is slid, and the distal end of the locking portion 8 pierces the patient's skin. A hollow tubular member 9 having a sharp tip 91 is inserted. The proximal end side of the lumen on the distal end side 81 of the locking portion 8 has substantially the same diameter as the outer diameter on the proximal end side of the second locking means 72 and is gradually reduced in diameter toward the distal end direction. ing. The lumen of the locking portion 8 proximal end side 82 is substantially the same diameter as the outer diameter of the hollow cylindrical portion 74 of the first locking means 71, and the annular raised portion 11 is located on the most proximal side. Is formed. As shown in FIG. 7, the raised portion 11 has a tapered portion 111 and a flat portion 112 continuous thereto. As shown in FIG. 6, the outer needle 3 is locked to the “retraction position” when the positive taper portion 78 of the second locking portion 72 of the inner needle 2 is connected to the distal end side of the locking portion 8 of the outer needle 3. The inner wall 83 having a reduced diameter 81 is frictionally engaged. As the distal end side inner wall 83 of the locking portion 8 of the outer needle 3 is slid in the proximal direction, it is locked by friction engagement with the tapered portion 78 while gradually increasing its frictional force. . By this frictional engagement, the outer needle 3 locked to the “retraction position” is prevented from easily sliding in the distal direction.
[0038]
As shown in FIG. 7, the outer needle 3 is locked to the “go position” by the annular ridge 11 provided on the inner wall of the proximal end 82 of the locking portion 8 of the outer needle 3. The reverse tapered portion 73 of the stop portion 71 is slid in the distal direction, and the tapered portion 111 and the reverse tapered portion 73 of the raised portion 11 are locked by friction engagement while gradually increasing the friction force. It is like that. Locking by this frictional engagement prevents the outer needle from sliding to the proximal end side, and prevents the outer needle 3 sliding in the distal direction from separating from the inner needle 2.
[0039]
【The invention's effect】
As described above, the present invention allows the outer needle having a sharp tip to be protected by the inner needle while the needle base and the tapered portion of the tip of the syringe remain connected. Therefore, it is possible to provide an injection needle with good operability and handling that is not complicated. In addition, since the structure is extremely simple, it is easy to manufacture and a low-cost injection needle can be provided. The double needle of the present invention can be applied to an existing syringe, and can provide a syringe having an erroneous puncture prevention function without changing the design of the syringe body.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a state in which an outer needle of a double needle of the present invention is in a “retraction position”.
FIG. 2 is a front cross-sectional view showing the outer needle of the double needle of the present invention in the “go position”.
FIG. 3 is a front sectional view showing an inner needle of a double needle of the present invention.
FIG. 4 is a front sectional view showing an outer needle of a double needle of the present invention.
FIG. 5 is an enlarged cross-sectional view showing a locking means for the inner needle of the double needle of the present invention.
6 is an enlarged view of a locking portion of the double needle of the present invention shown in FIG.
7 is an enlarged view of a locking portion of the double needle of the present invention shown in FIG.
FIG. 8 is a cross-sectional view of a conventional double needle.
FIG. 9 is a front view of a conventional double needle.
[Explanation of symbols]
2 Inner needle 3 Outer needle 4 Needle base 5 Convex part 6 Hollow cylindrical body 61 Dull tip 7 Locking part 71 First locking part 72 Second locking part 73 Reverse taper part 74 Cylindrical cylindrical shape with the same diameter Portion 77 Horizontal surface 78 Positive taper portion 79 Horizontal surface 80 Steep slope 8 Locking portion 81 Tip side 82 of locking portion 8 Base end side 83 of locking portion 8 The diameter of the tip side of locking portion 8 is reduced. The inner wall 9 The hollow cylindrical body 91 The sharp tip 11 The raised portion 111 The taper portion 112 The flat portion 50 The double needle 51 The hollow needle 52 The rod 53 The housing 55 The taper portion 56 The striker

Claims (3)

鈍い先端を有する中空円柱状の内針と、該内針の外周に外装され、内針先端を囲繞する位置から、内針の先端を露出可能な引き込み位置まで摺動可能な中空円柱状外針とからなり、前記内針および外針の基端部に、前記外針が囲繞する位置と引き込み位置に係止可能な係止部を備えた2重針において、前記内針の基端部には注射器に連結するよう設けられた針基が備えられ、前記針基先端側に前記係止部が設けられてなり、前記内針の針基が注射器に連結されたまま外針が囲繞する位置から引き込み位置にスライドすることを特徴とする2重針。A hollow cylindrical inner needle having a blunt tip, and a hollow cylindrical outer needle that is externally mounted on the outer periphery of the inner needle and is slidable from a position surrounding the inner needle tip to a retracted position where the tip of the inner needle can be exposed. consists of a, the proximal end portion of the inner needle and the outer needle, the double needle having a lockable locking part in the retracted position and a position where the outer needle is surrounded, the proximal end portion of the inner needle Is provided with a needle base provided so as to be connected to the syringe, the locking portion is provided on the needle base tip side, and the position where the outer needle surrounds the needle base of the inner needle while being connected to the syringe. A double needle characterized in that it slides to the retracted position. 前記係止部が、内針の基端部および外針の基端部に設けられ、前記内針の係止部の外周と、前記外針の係止部の内腔の内壁との摩擦係合により、外針が囲繞位置、および引き込み位置に係止されることを特徴する請求項1に記載の2重針。  The locking portion is provided at a proximal end portion of the inner needle and a proximal end portion of the outer needle, and a frictional engagement between an outer periphery of the locking portion of the inner needle and an inner wall of a lumen of the locking portion of the outer needle. The double needle according to claim 1, wherein the outer needle is locked at the surrounding position and the retracted position. 前記内針の係止部には、その外周に先端方向に拡径する逆テーパ−部と、該逆テーパ−部より先端側に先端方向に縮径する正テーパ−部が形成されており、外針の係止部には、該係止部の内腔の基端側に隆起部11が設けられ、先端側には、先端方向に向かって縮径された内壁が形成されており、前記逆テーパ−部と前記隆起部11の摩擦係合により外針3が内針先端を囲繞する位置に係止され、前記正テーパ−部と前記縮径された内壁の摩擦係合により外針3が内針の先端を露出可能な引き込み位置に係止されることを特徴する請求項2に記載の2重針。The locking portion of the inner needle is formed with a reverse tapered portion that expands in the distal direction on the outer periphery thereof, and a forward tapered portion that contracts in the distal direction on the distal side from the reverse tapered portion, The locking portion of the outer needle is provided with a raised portion 11 on the proximal end side of the lumen of the locking portion, and on the distal end side, an inner wall having a diameter reduced toward the distal direction is formed. The outer needle 3 is locked at a position surrounding the distal end of the inner needle by the frictional engagement of the reverse tapered portion and the raised portion 11, and the outer needle 3 is frictionally engaged by the forward tapered portion and the reduced inner wall. The double needle according to claim 2, wherein the double needle is locked at a retracted position where the tip of the inner needle can be exposed.
JP31595897A 1997-10-31 1997-10-31 Double needle with anti-puncture function Expired - Fee Related JP3704918B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31595897A JP3704918B2 (en) 1997-10-31 1997-10-31 Double needle with anti-puncture function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31595897A JP3704918B2 (en) 1997-10-31 1997-10-31 Double needle with anti-puncture function

Publications (2)

Publication Number Publication Date
JPH11128346A JPH11128346A (en) 1999-05-18
JP3704918B2 true JP3704918B2 (en) 2005-10-12

Family

ID=18071646

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31595897A Expired - Fee Related JP3704918B2 (en) 1997-10-31 1997-10-31 Double needle with anti-puncture function

Country Status (1)

Country Link
JP (1) JP3704918B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6761704B2 (en) * 2002-05-02 2004-07-13 Becton, Dickinson And Company Safety blood collection needle assembly
CN113397975A (en) * 2021-07-28 2021-09-17 杭州钱塘隆越生物科技有限公司 Nested formula redissolution device

Also Published As

Publication number Publication date
JPH11128346A (en) 1999-05-18

Similar Documents

Publication Publication Date Title
US5672161A (en) Needle assembly having single-handedly activated needle barrier
US5104385A (en) Protective needle assembly for hypodermic syringe
US5593391A (en) Ampule safety syringe
JP4786666B2 (en) Safety needle
RU2095090C1 (en) Syringe for hypodermic injections
CN105120934B (en) Syringe needle head assembly and the safety injector and safety syringe apparatus using the component
US20110092952A1 (en) Shield Apparatuses and Methods For Storing Syringe Assemblies and Needle Assemblies
US20090124966A1 (en) Ampoule usable as a syringe and a syringe unit comprising the ampoule
WO2015001819A1 (en) Liquid administration tool
JPH02243163A (en) Protector for cannula free to remove from hypodermous injector
JPH02119872A (en) Injector
JP2005530597A (en) Medical needle assembly
JP3414394B2 (en) Needle protection assembly
KR20180091078A (en) Medical injector cap
JP2009506848A (en) Disposable safety syringe with retractable needle
JP3095158B2 (en) Syringe assembly
US10342930B1 (en) Protective cover for a syringe needle
WO2016021323A1 (en) Needle assembly
JP3704918B2 (en) Double needle with anti-puncture function
EP1754499A1 (en) Safety hypodermic syringe with retractable needle carrier
KR200362573Y1 (en) Safety Syringe
WO2017044029A1 (en) Dental syringe and needle tip shielding system for a dental needle
KR100571553B1 (en) Safety Syringe
JPH08182761A (en) Syringe needle for protecting against infection
US20180093047A1 (en) Safe needle device for syringes

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20040722

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20040802

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20041001

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20050705

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20050718

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080805

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090805

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090805

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100805

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110805

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120805

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130805

Year of fee payment: 8

LAPS Cancellation because of no payment of annual fees