JPH06311986A - Pincers - Google Patents

Abstract

PURPOSE:To prevent the infiltration and fixation of blood and body fluid into an opening and closing mechanism part and to prevent an operation defect, etc., by providing the pincers with a cover member for concealing the opening and closing mechanism of pincer members. CONSTITUTION:A opening and closing member 36 installed at the front end of an operating rod opens and closes the pincer members 32a, 32b. The opening and closing mechanism is constituted by providing the front ends of the pincer members 32a, 32b with cam pins engaging with cam grooves 37a, 37b. The pincer members 32a, 32b are opened and closed without projecting the mechanism part for opening and closing the pincer members 32a, 32b from the insertion part. Consequently, the opening and closing mechanism for opening and closing the pincer members 32a, 32b does not project from the side parts of a sheath 11 and the front end of the sheath 11 is covered by a tubular front end cover 40. The infiltration of the blood and bodily fluid into the front end of the sheath 11 is prevented in such a manner as the fixation of the cam grooves 37a, 37b of the pincer opening and closing member 36 to the cam pins is prevented.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、内視鏡検査や内視鏡手
術のときに使用される鉗子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to forceps used during endoscopy and endoscopic surgery.

【０００２】[0002]

【従来の技術】この種の鉗子は、例えばドイツ実用新案
公報Ｇ９１０６５０６．２、ドイツ実用新案公報Ｇ８９
００３７６．４、実公昭５６−１０３３２号公報などに
記載されているように、内視鏡あるいはトラカール等を
介して体腔内に挿入される挿入部としてのシースと、こ
のシースの基端に設けられた操作部と、この操作部の操
作量に応じて上記シース内を進退動作する操作ロッド
と、この操作ロッドの先端にリンク機構等の開閉機構を
介して連結された一対の鉗子部材とを有し、これらの鉗
子部材をシースの先端部に設けられた軸を支点として相
反する方向に回動させることによって鉗子部材を開閉操
作するようになっている。2. Description of the Related Art Forceps of this type are disclosed, for example, in German Utility Model Publication G9106506.2 and German Utility Model Publication G89.
00376.4, Japanese Utility Model Publication No. 56-10332, etc., a sheath as an insertion portion to be inserted into a body cavity through an endoscope or a trocar, and a base end of the sheath. An operating part, an operating rod that moves back and forth in the sheath according to the amount of operation of the operating part, and a pair of forceps members connected to the tip of the operating rod via an opening / closing mechanism such as a link mechanism. The forceps members are opened and closed by rotating these forceps members in opposite directions with a shaft provided at the distal end of the sheath as a fulcrum.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、このよ
うな従来の鉗子は、操作ロッドと鉗子部材とを連結する
リンク機構等の開閉機構が外部に露出しているため、開
閉機構の機構部に血液や体液が侵入し、開閉機構の機構
部に侵入した血液や体液が固着することによって開閉機
構の作動抵抗が増大し、鉗子部材の開閉操作に支障を来
たす虞があった。However, in such a conventional forceps, since the opening / closing mechanism such as the link mechanism connecting the operating rod and the forceps member is exposed to the outside, the blood pressure is not applied to the mechanism portion of the opening / closing mechanism. If the blood or body fluid invades and the blood or body fluid that has entered the mechanism portion of the opening / closing mechanism is fixed, the operation resistance of the opening / closing mechanism increases, which may hinder the opening / closing operation of the forceps member.

【０００４】本発明は上述した問題点に着目してなされ
たもので、その目的は血液や体液が開閉機構に侵入する
ことを防止し、安定した操作力で鉗子部材を開閉操作す
ることのできる鉗子を提供することにある。The present invention has been made in view of the above-mentioned problems, and an object thereof is to prevent blood or body fluid from invading the opening / closing mechanism and to open / close the forceps member with a stable operation force. Providing forceps.

【０００５】[0005]

【課題を解決するための手段】上記課題を解決するため
に本発明は、生体内に挿入される挿入部内に設けられた
操作ロッドの進退動作に応動して前記挿入部の先端部に
回動自在に枢支された鉗子部材を開閉させる開閉機構を
備えた鉗子において、前記開閉機構を隠蔽するカバー部
材を設けたことを特徴とする。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention rotates the distal end portion of the insertion portion in response to the forward / backward movement of an operating rod provided in the insertion portion to be inserted into a living body. A forceps having an opening / closing mechanism for opening / closing a forceps member pivotally supported freely is provided with a cover member for concealing the opening / closing mechanism.

【０００６】[0006]

【作用】本発明においては、開閉機構を隠蔽するカバー
部材を設けることにより、開閉機構部に血液や体液が侵
入することがなくなり、安定した操作力で鉗子部材を開
閉操作することが可能となる。In the present invention, by providing the cover member for concealing the opening / closing mechanism, it is possible to prevent blood or body fluid from entering the opening / closing mechanism portion, and to open / close the forceps member with a stable operating force. .

【０００７】[0007]

【実施例】以下、本発明の一実施例を図１〜図８を参照
して説明する。図１において符号１０は内視鏡或いはト
ラカール等を介して体腔に挿入される挿入部であり、こ
の挿入部１０の先端には、体腔内の臓器や血管等を切断
するための鋏部３２が設けられている。なお、挿入部１
０は図２及び図７に示す如くステンレス鋼等の金属材料
からなる管状のシース１１と、このシース１１の外表面
を絶縁被覆するチューブ状の絶縁カバー１２とで形成さ
れ、シース１１の先端部にはスリ割り部３９が設けられ
ている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 10 is an insertion portion that is inserted into a body cavity through an endoscope or a trocar, and a scissors portion 32 for cutting an organ, a blood vessel, or the like in the body cavity is provided at the tip of the insertion portion 10. It is provided. The insertion part 1
Reference numeral 0 denotes a tubular sheath 11 made of a metal material such as stainless steel and a tubular insulating cover 12 for insulatingly coating the outer surface of the sheath 11 as shown in FIGS. A slitting portion 39 is provided in the.

【０００８】上記鋏部３２は、図３〜図７に示すように
ステンレス鋼等の金属材料からなる一対の鉗子部材３２
ａ，３２ｂに形成された貫通孔に支持ピン３５を挿通
し、この支持ピン３５の両端部をシース１１の先端スリ
割り部３９に固定保持して構成されており、鉗子部材３
２ａ，３２ｂの後端部にはアーム部３３ａ，３３ｂが設
けられている。As shown in FIGS. 3 to 7, the scissors portion 32 has a pair of forceps members 32 made of a metal material such as stainless steel.
The support pin 35 is inserted through the through holes formed in a and 32b, and both ends of the support pin 35 are fixedly held by the tip slitting portion 39 of the sheath 11, and the forceps member 3
Arm portions 33a and 33b are provided at the rear end portions of 2a and 32b.

【０００９】一方、挿入部１０の基端には、鉗子部材３
２ａ，３２ｂを開閉操作するための操作部１３が設けら
れている。この操作部１３は、挿入部１０の基端に突き
当てパイプ１４（図２参照）を介して固定された操作部
本体１５と、この操作部本体１５に止めねじ１６を介し
て回動自在に取り付けられた操作ハンドル１７とからな
り、操作部本体１５には指掛け部１８が形成されている
とともに、操作部本体１５を高周波電源に接続するため
の電極ピン１９が設けられている。On the other hand, the forceps member 3 is provided at the base end of the insertion portion 10.
An operation unit 13 for opening and closing the 2a and 32b is provided. The operation section 13 is fixed to the base end of the insertion section 10 via an abutment pipe 14 (see FIG. 2), and the operation section main body 15 is rotatable via a set screw 16. The operating portion main body 15 is provided with an operating handle 17, and a finger hooking portion 18 is formed on the operating portion main body 15, and an electrode pin 19 for connecting the operating portion main body 15 to a high frequency power source is provided.

【００１０】上記電極ピン１９は図２に示すように操作
部本体１５に形成された電極ピン取付孔に螺嵌してお
り、この電極ピン１９の先端には円錐状の係止突起２０
が設けられている。この係止突起２０はシース１１及び
突き当てパイプ１４を操作部本体１５に固定するととも
に高周波電源からの高周波電流をシース１１を介して鉗
子部材３２ａ，３２ｂに通電するためのものであり、シ
ース１１の基端部に形成されたＶ字形の凹部に係合して
いる。なお、操作部本体１５及び操作ハンドル１７の表
面には、高周波電流による感電事故を防止するために絶
縁被膜２１（図２参照）が形成されている。As shown in FIG. 2, the electrode pin 19 is screwed into an electrode pin mounting hole formed in the operation portion main body 15, and a conical locking projection 20 is provided at the tip of the electrode pin 19.
Is provided. The locking projection 20 is for fixing the sheath 11 and the butting pipe 14 to the operation portion main body 15 and for supplying a high frequency current from a high frequency power source to the forceps members 32a, 32b via the sheath 11. Engages with a V-shaped recess formed at the proximal end of the. An insulating coating 21 (see FIG. 2) is formed on the surfaces of the operation section body 15 and the operation handle 17 in order to prevent electric shock due to high frequency current.

【００１１】上記操作部１３の操作ハンドル１７には、
指掛け部２３が設けられているとともに係合溝２４が設
けられ、この係合溝２４には操作部本体１５の後端から
突出した連結ロッド２５の後端球形部２６が係合してい
る。上記連結ロッド２５は操作ロッド３１（図２参照）
を操作ハンドル１７に連結するためのものであり、この
連結ロッド２５の前端中心部には操作ロッド３１の後端
ねじ部３１ａがねじ込まれている。なお、連結ロッド２
５の前端部は操作部本体１５からの連結ロッド２５の抜
けを防止するために大径部２７となっており、この大径
部２７及び後端球形部２６を除く連結ロッド２５の周囲
にはフッ素系樹脂等の絶縁材料からなる熱収縮チューブ
２９が設けられ、さらに大径部２７の周面にはＯリング
３０が設けられている。The operation handle 17 of the operation section 13 has a
The finger hook 23 is provided and an engagement groove 24 is provided, and a rear end spherical portion 26 of a connecting rod 25 protruding from the rear end of the operation portion main body 15 is engaged with the engagement groove 24. The connecting rod 25 is an operating rod 31 (see FIG. 2).
Is connected to the operation handle 17, and a rear end threaded portion 31a of the operation rod 31 is screwed into the center of the front end of the connection rod 25. The connecting rod 2
The front end portion of 5 has a large diameter portion 27 to prevent the connecting rod 25 from coming off from the operation portion main body 15. Around the periphery of the connecting rod 25 except for the large diameter portion 27 and the rear end spherical portion 26. A heat-shrinkable tube 29 made of an insulating material such as a fluorine-based resin is provided, and an O-ring 30 is provided on the peripheral surface of the large diameter portion 27.

【００１２】上記操作ロッド３１は操作ハンドル１７の
回動操作によってシース１１の内部を進退動作するもの
であり、この操作ロッド３１の先端には鉗子開閉部材３
６（図４参照）が設けられている。The operating rod 31 is moved forward and backward inside the sheath 11 by rotating the operating handle 17, and the forceps opening / closing member 3 is attached to the tip of the operating rod 31.
6 (see FIG. 4) are provided.

【００１３】上記鉗子開閉部材３６は鉗子部材３２ａ，
３２ｂを開閉するためのものであり、鉗子部材３２ａ，
３２ｂのアーム部３３ａ，３３ｂと対向する鉗子開閉部
材３６の側面部には、図７に示すように操作ロッド３１
の移動方向に対して斜めに傾斜したカム溝３７ａ，３７
ｂが互いに非平行にかつ円弧状に設けられている。これ
らのカム溝３７ａ，３７ｂには鉗子部材３２ａ，３２ｂ
のアーム部３３ａ，３３ｂに設けられたカムピン３８
ａ，３８ｂ（図６参照）が係合しており、これらカムピ
ン３８ａ，３８ｂがカム溝３７ａ，３７ｂ内を相対移動
することにより、図８に示すように鉗子開閉部材３６が
支持ピン３５を支点として開動作するようになってい
る。なお、絶縁カバー１２の先端にはシース１１の先端
部に形成されたスリ割り部３９を覆うチューブ状の先端
カバー４０が設けられており、この先端カバー４０は絶
縁材料で形成されている。The forceps opening / closing member 36 is a forceps member 32a,
32b for opening and closing the forceps member 32a,
As shown in FIG. 7, the operation rod 31 is provided on the side surface of the forceps opening / closing member 36 facing the arms 33a and 33b of the armature 32b.
Cam grooves 37a, 37 inclined obliquely to the moving direction of the
b are non-parallel to each other and arcuately provided. Forceps members 32a and 32b are provided in these cam grooves 37a and 37b.
Cam pins 38 provided on the arm portions 33a and 33b of the
a, 38b (see FIG. 6) are engaged with each other, and the cam pins 38a, 38b relatively move within the cam grooves 37a, 37b, whereby the forceps opening / closing member 36 fulcrums the support pin 35 as shown in FIG. It is designed to operate as an open. A tube-shaped tip cover 40 is provided at the tip of the insulating cover 12 to cover the slit 39 formed at the tip of the sheath 11, and the tip cover 40 is made of an insulating material.

【００１４】上記のように構成される本発明の一実施例
では、操作ロッド３１の先端に設けられた鉗子開閉部材
３６の側面部に操作ロッド３１の移動方向に対して斜め
に傾斜したカム溝３７ａ，３７ｂを互いに非平行に設
け、これらカム溝３７ａ，３７ｂに係合するカムピン３
８ａ，３８ｂを鉗子部材３２ａ，３２ｂの基端部に設け
て開閉機構を構成してあるので、鉗子部材３２ａ，３２
ｂを開閉する機構部を挿入部１０の側部から突出させず
に鉗子部材３２ａ，３２ｂを開閉することができ、体腔
から抜去する際に開閉機構がトラカール等に引っ掛かる
のを防止することができる。In one embodiment of the present invention constructed as described above, a cam groove is formed on the side surface of the forceps opening / closing member 36 provided at the tip of the operating rod 31 and is inclined with respect to the moving direction of the operating rod 31. A cam pin 3 provided with 37a and 37b non-parallel to each other and engaged with the cam grooves 37a and 37b.
8a and 38b are provided at the base end portions of the forceps members 32a and 32b to configure the opening / closing mechanism, so that the forceps members 32a and 32b are provided.
The forceps members 32a and 32b can be opened and closed without projecting the mechanism portion for opening and closing b from the side portion of the insertion portion 10, and the opening and closing mechanism can be prevented from being caught by a trocar or the like when the forceps members 32a and 32b are removed from the body cavity. .

【００１５】また、上述した一実施例では、鉗子部材３
２ａ，３２ｂを開閉する開閉機構がシース１１の側部か
ら突出することがないので、シース１１の先端部をチュ
ーブ状の先端カバー４０によって覆うことができ、血液
や体液がシース１１の先端部に侵入し、鉗子開閉部材３
６のカム溝３７ａ，３７ｂやカムピン３８ａ，３８ｂに
固着するのを防止することができる。Further, in the above-described embodiment, the forceps member 3 is used.
Since the opening / closing mechanism for opening / closing 2a, 32b does not project from the side portion of the sheath 11, the distal end portion of the sheath 11 can be covered with the tubular distal end cover 40, so that blood and body fluid can reach the distal end portion of the sheath 11. Intruder, forceps opening / closing member 3
6 can be prevented from being fixed to the cam grooves 37a and 37b and the cam pins 38a and 38b.

【００１６】さらに、上述した一実施例では、鉗子部材
３２ａ，３２ｂを開閉する開閉機構がカム溝３７ａ，３
７ｂと、このカム溝３７ａ，３７ｂに係合するカムピン
３８ａ，３８ｂで構成されているので、シース１１の先
端部を絶縁性の先端カバー４０で覆うことができ、シー
ス１１の先端部からの高周波電流の漏れを防止すること
ができる。Further, in the above-described embodiment, the opening / closing mechanism for opening / closing the forceps members 32a, 32b has the cam grooves 37a, 3a.
7b and the cam pins 38a, 38b engaging with the cam grooves 37a, 37b, the tip of the sheath 11 can be covered with an insulating tip cover 40, and the high frequency from the tip of the sheath 11 can be increased. It is possible to prevent current leakage.

【００１７】さらにまた、上述した一実施例では、鉗子
部材３２ａ，３２ｂを支持するピン３５が先端カバー４
０によって覆い隠されているので、シース１１からのピ
ン３５の脱落を防止することができる。Furthermore, in the above-described embodiment, the pin 35 for supporting the forceps members 32a and 32b is provided with the tip cover 4.
Since it is covered with 0, it is possible to prevent the pin 35 from falling off the sheath 11.

【００１８】なお、本発明は上述した一実施例に限定さ
れるものではない。たとえば、上述した一実施例では先
端カバー４０の後端部を内側に折り返したが、図９に示
す第２実施例のように先端カバー４０の後端を絶縁カバ
ー１２の前端に突き当てても良い。また、図１０に示す
第３実施例のように先端カバー４０の後端部で絶縁カバ
ー１２の前端部を覆い隠すようにして良いし、図１１に
示す第４実施例のように絶縁カバー１２の前端部を先端
カバー４０の後端部に圧入しても良い。The present invention is not limited to the above-mentioned embodiment. For example, although the rear end portion of the tip cover 40 is folded back inward in the above-described embodiment, the rear end of the tip cover 40 may be abutted against the front end of the insulating cover 12 as in the second embodiment shown in FIG. good. Further, the front end portion of the insulating cover 12 may be covered with the rear end portion of the front end cover 40 as in the third embodiment shown in FIG. 10, or the insulating cover 12 as in the fourth embodiment shown in FIG. The front end portion of the above may be pressed into the rear end portion of the front end cover 40.

【００１９】次に、本発明の第５実施例を図１２〜図２
３を参照して説明する。図１２において符号１０は内視
鏡或いはトラカール等を介して体腔に挿入される挿入部
であり、この挿入部１０の先端には、体腔内の組織を把
持する把持部４３が設けられている。なお、挿入部１０
は図１３及び図１７に示す如くステンレス鋼等の金属材
料からなる管状の第１シース１１ａと、この第１シース
１１ａの先端に嵌着された第２シース１１ｂと、これら
第１シース１１ａ及び第２シース１１ｂの外周を絶縁被
覆するチューブ状の絶縁カバー５２とで形成され、第２
シース１１ｂの外周面にはゴム等のシール材からなるＯ
リング５１が設けられている。Next, a fifth embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. In FIG. 12, reference numeral 10 is an insertion portion that is inserted into a body cavity through an endoscope, a trocar, or the like, and a grip portion 43 that grasps the tissue in the body cavity is provided at the tip of the insertion portion 10. The insertion part 10
As shown in FIGS. 13 and 17, a tubular first sheath 11a made of a metal material such as stainless steel, a second sheath 11b fitted to the tip of the first sheath 11a, the first sheath 11a and the first sheath 11a And a tubular insulating cover 52 that insulates the outer circumference of the two sheaths 11b.
The outer peripheral surface of the sheath 11b is made of a sealing material such as rubber O
A ring 51 is provided.

【００２０】上記把持部４３は、図１４〜図１７に示す
ようにステンレス鋼等の金属材料からなる一対の鉗子部
材４３ａ，４３ｂに形成されたピン挿通孔４４ａ，４４
ｂに支持ピン３５を挿通し、この支持ピン３５の両端を
シース１１ｂの先端スリ割り部３９にカシメ固定して構
成されており、鉗子部材４３ａ，４３ｂの基端部にはア
ーム部４５ａ，４５ｂが設けられている。なお、ピン挿
通孔４４ａ，４４ｂは鉗子部材４３ａ，４３ｂの開き角
を大きくするために長円形状となっている。また、支持
ピン３５の外周にはカラー４６ａ，４６ｂが設けられ、
さらにカラー４６ａ，４６ｂの外周にはリング４７が鉗
子部材４３ａ，４３ｂのアーム部４５ａ，４５ｂ間に挟
まれた状態で設けられている。As shown in FIGS. 14 to 17, the grip portion 43 has pin insertion holes 44a and 44 formed in a pair of forceps members 43a and 43b made of a metal material such as stainless steel.
b, the support pin 35 is inserted, and both ends of the support pin 35 are caulked and fixed to the tip slitting portion 39 of the sheath 11b. Arm portions 45a and 45b are provided at the base end portions of the forceps members 43a and 43b. Is provided. The pin insertion holes 44a and 44b have an oval shape in order to increase the opening angle of the forceps members 43a and 43b. Further, collars 46a and 46b are provided on the outer periphery of the support pin 35,
Further, a ring 47 is provided on the outer circumference of the collars 46a and 46b in a state of being sandwiched between the arm portions 45a and 45b of the forceps members 43a and 43b.

【００２１】一方、挿入部１０の基端には、鉗子部材４
３ａ，４３ｂを支持ピン３５を支点として開閉操作する
ための操作部１３が設けられている。この操作部１３
は、シース１１ａの基端に突き当てパイプ１４（図１３
参照）を介して固定された操作部本体１５と、この操作
部本体１５に止めねじ１６を介して回動自在に取り付け
られた操作ハンドル１７とからなり、操作部本体１５に
は指掛け部１８が設けられているとともに、操作部本体
１５を高周波電源に接続するための電極ピン１９が設け
られている。On the other hand, the forceps member 4 is provided at the base end of the insertion portion 10.
An operation unit 13 is provided for opening and closing 3a and 43b with the support pin 35 as a fulcrum. This operation unit 13
Abuts on the proximal end of the sheath 11a (see FIG. 13).
(Refer to FIG. 4), and an operation handle 17 rotatably attached to the operation unit body 15 via a set screw 16. The operation unit body 15 is provided with a finger hook portion 18. In addition to being provided, electrode pins 19 for connecting the operation section body 15 to a high frequency power source are provided.

【００２２】上記電極ピン１９は操作部本体１５に形成
された電極ピン取付孔に螺嵌しており、この電極ピン１
９の先端には円錐状の係止突起２０が設けられている。
この係止突起２０はシース１１ａ及び突き当てパイプ１
４を操作部本体１５に固定するとともに高周波電源から
の高周波電流をシース１１ａ，１１ｂを介して鉗子部材
４３ａ，４３ｂに通電するためのものであり、シース１
１ａの基端部に形成されたＶ字形の凹部に係合してい
る。なお、操作部本体１５及び操作ハンドル１７の表面
には、高周波電流による感電事故を防止するために絶縁
被膜２１（図１３参照）が形成されている。また、止め
ねじ１６の頭部には、図２０に示すようにリング状のワ
ッシャ４１を介して絶縁キャップ４２が被着されてい
る。The electrode pin 19 is screwed into an electrode pin mounting hole formed in the operation portion main body 15, and the electrode pin 1
A conical locking protrusion 20 is provided at the tip of 9.
The locking projection 20 is formed by the sheath 11a and the butting pipe 1.
4 is fixed to the operation portion main body 15 and a high-frequency current from a high-frequency power source is applied to the forceps members 43a and 43b via the sheaths 11a and 11b.
It engages with a V-shaped recess formed at the base end of 1a. An insulating coating 21 (see FIG. 13) is formed on the surfaces of the operation portion main body 15 and the operation handle 17 in order to prevent electric shock due to high frequency current. An insulating cap 42 is attached to the head of the set screw 16 via a ring-shaped washer 41 as shown in FIG.

【００２３】上記操作部１３の操作ハンドル１７には、
指掛け部２３が設けられているとともに係合溝２４が設
けられ、この係合溝２４には操作部本体１５の後端から
突出した連結ロッド２５の後端球形部２６が係合してい
る。上記連結ロッド２５は挿入部１０の内部に設けられ
た操作ロッド３１（図１３参照）を操作ハンドル１７に
連結するためのものであり、この連結ロッド２５の前端
中心部には操作ロッド３１の後端ねじ部３１ａがねじ込
まれている。なお、連結ロッド２５の前端部は操作部本
体１５からの連結ロッド２５の抜けを防止するために大
径部２７となっており、この大径部２７及び後端球形部
２６を除く連結ロッド２５の周囲にはフッ素系樹脂等の
絶縁材料からなる熱収縮チューブ２９が設けられ、さら
に大径部２７の周面にはＯリング３０が設けられてい
る。The operation handle 17 of the operation section 13 has a
The finger hook 23 is provided and an engagement groove 24 is provided, and a rear end spherical portion 26 of a connecting rod 25 protruding from the rear end of the operation portion main body 15 is engaged with the engagement groove 24. The connecting rod 25 is for connecting the operating rod 31 (see FIG. 13) provided inside the insertion portion 10 to the operating handle 17, and the rear end of the operating rod 31 is located at the center of the front end of the connecting rod 25. The end screw part 31a is screwed. The front end portion of the connecting rod 25 has a large diameter portion 27 to prevent the connecting rod 25 from coming off from the operation portion main body 15. The connecting rod 25 except the large diameter portion 27 and the rear end spherical portion 26. A heat-shrinkable tube 29 made of an insulating material such as a fluorine-based resin is provided on the periphery of the, and an O-ring 30 is provided on the peripheral surface of the large diameter portion 27.

【００２４】上記操作ロッド３１は操作ハンドル１７の
回動操作によってシース１１ａ，１１ｂの内部を進退動
作するものであり、この操作ロッド３１の先端には鉗子
開閉部材３６（図１４及び図１７参照）が連結軸４８を
介して設けられている。なお、連結軸４８の周面にはシ
ース１１ｂの内周面に摺動自在に接するＯリング４９が
設けられている。The operating rod 31 moves forward and backward inside the sheaths 11a and 11b by the turning operation of the operating handle 17, and a forceps opening / closing member 36 (see FIGS. 14 and 17) is provided at the tip of the operating rod 31. Are provided via a connecting shaft 48. An O-ring 49 is provided on the peripheral surface of the connecting shaft 48 so as to slidably contact the inner peripheral surface of the sheath 11b.

【００２５】上記鉗子開閉部材３６は鉗子部材４３ａ，
４３ｂを開閉するためのものであり、鉗子部材４３ａ，
４３ｂのアーム部４５ａ，４５ｂと対向する鉗子開閉部
材３６の側面部には、図１７に示すように操作ロッド３
１の移動方向に対して斜めに傾斜したカム溝３７ａ，３
７ｂが互いに非平行にかつ円弧状に設けられている。こ
れらのカム溝３７ａ，３７ｂには鉗子部材４３ａ，４３
ｂのアーム部４５ａ，４５ｂに設けられたカムピン３８
ａ，３８ｂ（図１６参照）が係合しており、これらカム
ピン３８ａ，３８ｂがカム溝３７ａ，３７ｂ内を相対移
動することにより、図１８に示すように鉗子部材４３
ａ，４３ｂが前方に移動しながらピン３５を支点として
開動作するようになっている。なお、カムピン３８ａ，
３８ｂの外周には、カム溝３７ａ，３７ｂとの摩擦抵抗
を軽減するためにリング５０ａ，５０ｂが遊嵌されてい
る。The forceps opening / closing member 36 is a forceps member 43a,
43b for opening and closing the forceps member 43a,
As shown in FIG. 17, the operation rod 3 is provided on the side surface of the forceps opening / closing member 36 facing the arms 45a and 45b of the armature 43b.
Cam grooves 37a, 3 inclined obliquely to the moving direction of 1
7b are non-parallel to each other and arcuately provided. The forceps members 43a, 43 are provided in these cam grooves 37a, 37b.
cam pins 38 provided on the arm portions 45a and 45b
a and 38b (see FIG. 16) are engaged with each other, and the cam pins 38a and 38b relatively move in the cam grooves 37a and 37b, so that the forceps member 43 as shown in FIG.
While the a and 43b are moving forward, the pin 35 serves as a fulcrum for opening operation. The cam pins 38a,
Rings 50a and 50b are loosely fitted to the outer periphery of 38b to reduce frictional resistance with the cam grooves 37a and 37b.

【００２６】上記絶縁カバー５２は挿入部１０を形成す
るシース１１ａ，１１ｂの軸方向及び円周方向に移動可
能となっており、この絶縁カバー５２の後端には、コイ
ルバネ５８のバネ力を受けるバネ受け５４が設けられて
いる。上記コイルバネ５８は絶縁カバー５２の先端をシ
ース１１ｂの先端に形成された段部３４に押し当てるた
めのものであり、突き当てパイプ１４とバネ受け５４と
の間に配設されている。The insulating cover 52 is movable in the axial direction and the circumferential direction of the sheaths 11a and 11b forming the insertion portion 10, and the rear end of the insulating cover 52 receives the spring force of a coil spring 58. A spring receiver 54 is provided. The coil spring 58 is for pressing the tip of the insulating cover 52 against the step portion 34 formed at the tip of the sheath 11b, and is arranged between the butting pipe 14 and the spring receiver 54.

【００２７】上記突き当てパイプ１４の前端大径部５６
には、絶縁カバー５２の摺動範囲を規制する係止孔５７
が形成されている。この係止孔５７にはバネ受け５４を
絶縁カバー５２に固定する固定ねじ５５の頭部が係合し
ており、上記固定ねじ５５の頭部を図２１に示す実線位
置から破線位置に移動させることにより、絶縁カバー５
２の先端が挿入部１０の先端部から後退した位置にロッ
クされるようになっている。なお、操作部１３の前端に
は突き当てパイプ１４の前端大径部５６を被覆する筒状
の絶縁カバー５３が設けられ、この絶縁カバー５３の前
端部と後端部にはシールリング５９，６０が設けられて
いる。また、絶縁カバー５２の後端部（図１３中矢印Ａ
で示す位置）には、シース１１ｂの先端スリ割り部３９
を絶縁カバー５２から露出させるための手順を示す指標
６０（図２２参照）が設けられている。The large diameter portion 56 of the front end of the butting pipe 14
Has a locking hole 57 for restricting the sliding range of the insulating cover 52.
Are formed. A head of a fixing screw 55 for fixing the spring receiver 54 to the insulating cover 52 is engaged with the locking hole 57, and the head of the fixing screw 55 is moved from the solid line position shown in FIG. 21 to the broken line position. Insulation cover 5
The tip of 2 is locked at a position retracted from the tip of the insertion portion 10. A cylindrical insulating cover 53 that covers the large-diameter front end portion 56 of the butting pipe 14 is provided at the front end of the operating portion 13, and seal rings 59, 60 are provided at the front end portion and the rear end portion of the insulating cover 53. Is provided. Further, the rear end portion of the insulating cover 52 (arrow A in FIG.
Position), the tip slitting portion 39 of the sheath 11b.
An index 60 (see FIG. 22) is provided that indicates the procedure for exposing the substrate from the insulating cover 52.

【００２８】上記のように構成される本発明の一実施例
では、鉗子部材４３ａ，４３ｂを開閉する開閉機構が操
作ロッド３１の先端に設けられた鉗子開閉部材３６と、
この鉗子開閉部材３６の側面部に形成されたカム溝３７
ａ，３７ｂに係合するカムピン３８ａ，３８ｂとで構成
されているので、開閉機構を挿入部１０の側部から突出
させずに鉗子部材４３ａ，４３ｂを開閉させることがで
きる。In the embodiment of the present invention configured as described above, an opening / closing mechanism for opening / closing the forceps members 43a and 43b is provided with a forceps opening / closing member 36 provided at the tip of the operating rod 31,
The cam groove 37 formed on the side surface of the forceps opening / closing member 36.
Since the cam pins 38a and 38b are engaged with a and 37b, the forceps members 43a and 43b can be opened and closed without causing the opening / closing mechanism to project from the side portion of the insertion portion 10.

【００２９】また、挿入部１０の先端スリ割り部３９が
筒状の絶縁カバー５２によって覆われているので、血液
や体液が先端スリ割り部３９に侵入して鉗子部材４３
ａ，４３ｂを開閉する機構部を構成するカム溝３７ａ，
３７ｂやカムピン３８ａ，３８ｂに固着することを防止
できる。Further, since the tip slitting portion 39 of the insertion portion 10 is covered by the cylindrical insulating cover 52, blood and body fluid enter the tip slitting portion 39 and forceps member 43.
a, a cam groove 37a which constitutes a mechanical portion for opening and closing 43b,
It is possible to prevent sticking to 37b and cam pins 38a, 38b.

【００３０】さらに、鉗子部材４３ａ，４３ｂのピン挿
通孔４４ａ，４４ｂが長円形状に形成されているので、
鉗子部材４３ａ，４３ｂの開き角度を大きくすることが
できる。Furthermore, since the pin insertion holes 44a and 44b of the forceps members 43a and 43b are formed in an oval shape,
The opening angle of the forceps members 43a and 43b can be increased.

【００３１】さらにまた、カム溝３７ａ，３７ｂ内を摺
動するカムピン３８ａ，３８ｂにリング５０ａ，５０ｂ
が回転可能に被嵌されているので、カム溝３７ａ，３７
ｂとカムピン３８ａ，３８ｂとの摩擦抵抗を低減するこ
とができ、カム溝３７ａ，３７ｂやカムピン３８ａ，３
８ｂの破損を防止することができる。Furthermore, rings 50a and 50b are attached to the cam pins 38a and 38b which slide in the cam grooves 37a and 37b.
Is rotatably fitted, the cam grooves 37a, 37
b and the cam pins 38a, 38b, the frictional resistance between the cam pins 37a, 37b and the cam pins 38a, 3b can be reduced.
It is possible to prevent damage to 8b.

【００３２】なお、本発明は上述した一実施例に限定さ
れるものではない。たとえば、図２３に示す第６実施例
のように突き当てパイプ１４の前端に板バネ状の係止部
材６３を設け、この係止部材６３を絶縁カバー５２に形
成されたクリック孔６２ａ，６２ｂに選択的に係合させ
て絶縁カバー５２の位置決めを行なうようにしても良い
し、あるいはシース１１ａと絶縁カバー５２に互いに係
合するねじ部を設け、絶縁カバー５２を螺合式としても
良い。また、絶縁カバー５２を伸縮性の有する材料で形
成し、絶縁カバー５２を図２４に示すように変形させて
絶縁カバー５２の先端をシース１１ｂの先端スリ割り部
３９から後退させるようにしても良い。The present invention is not limited to the above-mentioned embodiment. For example, as in the sixth embodiment shown in FIG. 23, a leaf spring-shaped locking member 63 is provided at the front end of the butting pipe 14, and the locking member 63 is fitted into the click holes 62a and 62b formed in the insulating cover 52. The insulating cover 52 may be positioned by selectively engaging it, or the insulating cover 52 may be screwed by providing the sheath 11a and the insulating cover 52 with screw portions that engage with each other. Alternatively, the insulating cover 52 may be formed of a stretchable material, and the insulating cover 52 may be deformed as shown in FIG. 24 so that the tip of the insulating cover 52 is retracted from the tip slit portion 39 of the sheath 11b. .

【００３３】[0033]

【発明の効果】以上説明したように本発明によれば、鉗
子部材を開閉駆動する開閉機構部に血液や体液が侵入す
ることがないので、開閉機構部に血液や体液が固着する
のを防止でき、血液や体液の固着による開閉機構部の作
動不良等を防止することのできる鉗子を提供できる。As described above, according to the present invention, blood and body fluid do not enter into the opening / closing mechanism portion that drives the forceps member to open and close, so that blood and body fluid are prevented from sticking to the opening / closing mechanism portion. Therefore, it is possible to provide the forceps that can prevent malfunction of the opening / closing mechanism due to adherence of blood or body fluid.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の第１実施例に係る鉗子の概略構成を示
す側面図。FIG. 1 is a side view showing a schematic configuration of forceps according to a first embodiment of the present invention.

【図２】同実施例に係る鉗子の一部分を示す断面図。FIG. 2 is a sectional view showing a part of the forceps according to the embodiment.

【図３】同実施例に係る鉗子の一部分を示す側面図。FIG. 3 is a side view showing a part of the forceps according to the embodiment.

【図４】同実施例に係る鉗子の一部分を示す平面図。FIG. 4 is a plan view showing a part of the forceps according to the embodiment.

【図５】図４のＡ−Ａ線に沿う断面図。5 is a cross-sectional view taken along the line AA of FIG.

【図６】図４のＢ−Ｂ線に沿う断面図。6 is a sectional view taken along the line BB of FIG.

【図７】同実施例に係る鉗子の一部分を示す断面図。FIG. 7 is a cross-sectional view showing a part of the forceps according to the embodiment.

【図８】同実施例に係る鉗子の鉗子部材を開放操作した
状態を示す図。FIG. 8 is a view showing a state where a forceps member of the forceps according to the embodiment is operated to be opened.

【図９】本発明の第２実施例に係る鉗子の要部を示す
図。FIG. 9 is a view showing a main part of the forceps according to the second embodiment of the present invention.

【図１０】本発明の第３実施例に係る鉗子の要部を示す
図。FIG. 10 is a view showing the main parts of the forceps according to the third embodiment of the present invention.

【図１１】本発明の第４実施例に係る鉗子の要部を示す
図。FIG. 11 is a diagram showing a main part of forceps according to a fourth embodiment of the present invention.

【図１２】本発明の第５実施例に係る鉗子の概略構成を
示す側面図。FIG. 12 is a side view showing a schematic configuration of forceps according to a fifth embodiment of the present invention.

【図１３】同実施例に係る鉗子の一部分を示す断面図。FIG. 13 is a sectional view showing a part of the forceps according to the embodiment.

【図１４】同実施例に係る鉗子の一部分を示す平面図。FIG. 14 is a plan view showing a part of the forceps according to the embodiment.

【図１５】図１４のＥ−Ｅ線に沿う断面図。15 is a cross-sectional view taken along the line EE in FIG.

【図１６】図１４のＦ−Ｆ線に沿う断面図。16 is a sectional view taken along the line FF of FIG.

【図１７】同実施例に係る鉗子の一部分を示す断面図。FIG. 17 is a sectional view showing a part of the forceps according to the embodiment.

【図１８】同実施例に係る鉗子の鉗子部材を開放操作し
た状態を示す図。FIG. 18 is a view showing a state in which the forceps member of the forceps according to the embodiment is operated to be opened.

【図１９】図１３のＤ−Ｄ線に沿う断面図。FIG. 19 is a cross-sectional view taken along the line DD of FIG.

【図２０】図１２のＣ−Ｃ線に沿う断面図。20 is a cross-sectional view taken along the line CC of FIG.

【図２１】同実施例に係る鉗子の係止孔の形状を示す
図。FIG. 21 is a view showing the shape of a locking hole of the forceps according to the embodiment.

【図２２】同実施例に係る鉗子の絶縁カバーに形成され
た指標を示す図。FIG. 22 is a view showing an index formed on the insulating cover of the forceps according to the example.

【図２３】本発明の第６実施例に係る鉗子の要部を示す
図。FIG. 23 is a view showing the main parts of the forceps according to the sixth embodiment of the present invention.

【図２４】本発明の第７実施例に係る鉗子の要部を示す
図。FIG. 24 is a view showing the main parts of the forceps according to the seventh embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１０…挿入部 １１，１１ａ，１１ｂ…シース １２，５２…絶縁カバー １３…操作部 １９…電極ピン ３１…操作ロッド ３２ａ，３２ｂ，４３ａ，４３ｂ…鉗子部材 ３５…ピン ３６…鉗子開閉部材 ３７ａ，３７ｂ…カム溝 ３８ａ，３８ｂ…カムピン ４０…先端カバー 10 ... Insertion part 11, 11a, 11b ... Sheath 12, 52 ... Insulation cover 13 ... Operation part 19 ... Electrode pin 31 ... Operation rod 32a, 32b, 43a, 43b ... Forceps member 35 ... Pin 36 ... Forceps opening / closing member 37a, 37b. ... Cam grooves 38a, 38b ... Cam pin 40 ... Tip cover

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 生体内に挿入される挿入部内に設けられ
た操作ロッドの進退動作に応動して前記挿入部の先端部
に回動自在に枢支された鉗子部材を開閉させる開閉機構
を備えた鉗子において、前記開閉機構を隠蔽するカバー
部材を設けたことを特徴とする鉗子。1. An opening / closing mechanism for opening and closing a forceps member pivotally supported by a distal end portion of the insertion portion in response to forward and backward movements of an operating rod provided in the insertion portion to be inserted into a living body. In the forceps, a forceps is provided with a cover member for concealing the opening / closing mechanism.