JPH06285078A - 鉗 子 - Google Patents
鉗 子Info
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- JPH06285078A JPH06285078A JP5078253A JP7825393A JPH06285078A JP H06285078 A JPH06285078 A JP H06285078A JP 5078253 A JP5078253 A JP 5078253A JP 7825393 A JP7825393 A JP 7825393A JP H06285078 A JPH06285078 A JP H06285078A
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Abstract
が鉗子本体より外側に突出することがなく、把持した
り、切断する際の操作性が向上する鉗子を提供する。 【構成】先端部に開閉自在な鉗子部1、基端部に操作部
を設けた挿入部2と、この挿入部2に設けられ操作部の
操作によって進退し鉗子部1を開閉する駆動部材8とか
らなる鉗子において、前記鉗子部1を枢支部13を支点
として回動する一対の鉗子部材4、5によって構成し、
この鉗子部材4、5の後端部に突起4b、5bを設け、
前記駆動部材8の先端部に前記突起4b、5bと係合す
るカム溝14b、14cを形成し、前記駆動部材8の進
退動作によって鉗子部1を開閉するように構成したこと
にある。
Description
手術に使用し、組織を把持したり、切断するための鉗子
に関する。
したり、切断するための鉗子(鋏)として特開平4−2
46344号公報が知られている。この鉗子は、先端部
に開閉自在な鉗子部、基端部に操作部を設けた鉗子本体
と、この鉗子本体に設けられ前記操作部の操作によって
進退し前記鉗子部を開閉する駆動部材とから構成されて
いる。
な一対の鉗子部材によって形成され、鉗子部材の後端部
にはカム溝が設けられている。また、前記操作部によっ
て進退駆動される駆動部材の先端部には係合ピンが突設
され、この係合ピンは前記カム溝に係合しており、駆動
部材の進退によって鉗子部材が枢支ピンを支点として開
閉されるようになっている。
に示された鉗子は、鉗子本体の先端部に枢支ピンを支点
として回動自在な鉗子部材が設けられているとともに、
進退自在な案内部材が設けられている。また、鉗子部材
の後端部には延長部が設けられ、この延長部は案内部材
に設けた案内チャンネルに係合している。そして、案内
部材を操作部材によって進退させることにより、延長部
を介して鉗子部材を開閉するようになっている。
ように構成された鉗子のうち前者のものは、組織を切断
したり、処置具等を把持するときに、カム溝に相当大き
な力が加わる。このためカム溝を形成した鉗子部材に十
分な強度を持たせるために、カム溝周辺の形状寸法が大
きくなる。
とすると、その部材の後端部が鉗子本体としての挿入部
の径よりも外に大きく飛び出してしまう。特に、この種
の鉗子は筒状のトラカ―ルに挿通して使用するので、外
に飛び出した鉗子部材の後端部がトラカ―ルの前端に引
っ掛かって閉じにくくなる。
ので摺動面が硬く、対する係合ピンは接触部の面積が小
さいので更に硬い材料を用いなければならない。これは
設計製造の困難さを増す。
き、鉗子部材の後端部が挿入部の外径より外に大きく突
出し、前者の同様な欠点があるとともに、延長部が細く
長いため折れやすい。また、不測の事態に遭遇して閉じ
ることができないまま抜去しなければならないとき、延
長部が斜め後方に突出しているため、トラカ―ルの前端
に引っ掛かって抜けにくくなる。この際、トラカ―ルご
と引き抜こうとしても、突出した延長部が抜去の妨げと
なってしまう。さらに、延長部の幅(厚さ)が変化して
いるので、案内チャンネルとの組合せで隙間が発生し鉗
子部材の動きにガタが出やすい。
節リンク機構によって構成したものもあるが、鉗子部材
を開いたときリンクが挿入部より突出し、開いたままで
はトラカ―ルから抜去することができない。さらに、4
節リンク機構の特性から鉗子部材が閉じきるときに先端
部に発生させ得る力が最も小さくなり、組織を切断する
鋏としての機能を持たせた場合に極めて不利である。
もので、その目的とするところは、鉗子部材を開いたと
きにも、その鉗子部材の後端部が鉗子本体としての挿入
部の径より外側に突出することがなく、把持したり、切
断する際の操作性が向上するとともに、開閉機構に破損
が発生した場合もトラカ―ル等に引っ掛かることなく容
易に引き抜くことができる鉗子を提供しようとするもの
である。
記目的を達成するために、先端部に開閉自在な鉗子部、
基端部に操作部を設けた鉗子本体と、この鉗子本体に設
けられ前記操作部の操作によって進退し前記鉗子部を開
閉する駆動部材とからなる鉗子において、前記鉗子部を
枢支部を支点として回動する一対の鉗子部材によって構
成し、この鉗子部材の後端部に突起を設け、前記駆動部
材の先端部に前記突起と係合するカム溝を形成し、前記
駆動部材の進退動作によって鉗子部を開閉することにあ
る。
と、カム溝の内部を突起が摺動して鉗子部材の後端部が
交差し、鉗子部材は枢支部を支点として回動して鉗子部
材が開き、逆に駆動部材を後退させると、鉗子部材の先
端部が閉じる。
説明する。
内視鏡用鉗子の全体を示し、鉗子は、鉗子部1と鉗子本
体としての挿入部2と操作部3とから構成されている。
鉗子部1は、鋏形状に構成された一対の鉗子部材4、5
と、この鉗子部材4、5を開閉する開閉機構6とからな
る。
に進退自在に挿通され前記開閉機構6に連結される駆動
部材8とからなる。
自在な一対のハンドル9a、9bと、前記駆動部材8と
連結される連結部材10とからなる。
て患者の腹腔に挿入し、ハンドル9a、9bを術者が開
閉することによって先端部1の鉗子部材4、5が開閉
し、臓器、血管、腹膜等の対象物を切断することがで
き、また、把持鉗子や剥離鉗子として使用する場合も、
ハンドル9a、9bの開閉によって鉗子部材4、5が開
閉して対象物を把持または剥離することができる。
子部1および挿入部2の細部を説明すると、シース7の
先端部には円筒状の保持部材12が突設され、この保持
部材12の上下部には軸方向に沿ってスロット12aが
形成されている。
構成する一対の鉗子部材4、5の後端部が収納され、こ
の鉗子部材4、5の中間部は枢支部としての枢支ピン1
3によって保持部材12に対して回動自在に枢支されて
いる。鉗子部材4、5の先端側には刃部4a、5aが形
成され、後端部の内側には円柱状の突起4b、5bが突
設されている。さらに、鉗子部材4、5の刃部4a、5
aは湾曲している。この場合、使い勝手によって湾曲方
向が上下左右に異なっている必要がある。
8と一体的に設けられ、駆動部材の一部をなす連結部材
14が軸方向に進退自在に挿入されている。
で、その側面には円弧状のカム溝14b、14cが交差
するように形成され、このカム溝14b、14cにはそ
れぞれ前記突起4b、5bが摺動自在に係合されてい
る。なお、カム溝14b、14cは円弧状に限らず、任
意の曲線でも傾斜した直線状でもよい。
その中途部にはOリング14eが嵌合され、保持部材1
1との間をシールしている。さらに、連結部材14の先
端部14aの幅(高さ)は後端部14dの径より大き
く、先端部14aの後端側は後端部14dより外側に張
り出した後端面14fに形成されている。
で、保持部材12のスロット12aの底面12bは連結
部材14の後端面14fと接している。この状態でカム
溝14b、14cの先端側の端部は突起4b、5bに対
して一定の間隔を保っており、接触することはない。
4、5の後端部の突起4b、5bに相当する位置に形成
した段差部4c、5cの間に嵌挿されており、図3は鉗
子部材4、5の突起4b、5bと、段差部4c、5cの
間に嵌挿した連結部材14の先端部14aとの位置関係
を示す。
それぞれ挿入部2の長手方向の軸に直交する方向に延び
ており、これら突起4b、5bはカム溝14b、14c
の底面に向かって突出しているが、カム溝14b、14
cは突起4b、5bの先端と接触しないように形成され
ている。
5および図6に基づき説明すると、挿入部2は、管状部
材16と、その外側に被嵌された管状の絶縁部材17と
からなり、管状部材16の中に駆動部材8が進退自在に
挿通されている。
材16が露出して延長し、この露出部16aがハンドル
9aに設けられた貫通孔9cに挿入されている。貫通孔
9cと管状部材16の露出部16aとの間には中間部材
19が埋設され、さらに露出部16aには円錐状の係合
穴16bが形成され、この係合穴16bにはハンドル9
aに捩じ込み固定された高周波電源端子となる固定部材
18の先端部が係合している。
上の180°離れた位置にも形成してあるが、円周上に
90°の間隔で形成してもよく、さらに小さい間隔で多
数設けてもよい。このように係合穴16bを複数設ける
ことによって、鉗子部材4a、5aの湾曲方向を望みの
位置に定めて固定することができる。
について説明する。ハンドル9a、9bに手指を掛けて
操作することによって、駆動部材8がシース7の内部を
前進し、連結部材14も先端側に移動する。連結部材1
4の先端部14aに設けられたカム溝14b、14cが
前進することによって、突起4b、5bがカム溝14
b、14cの中を摺動し、鉗子部材4、5は枢支ピン1
3を支点として相対的に開く方向に回動する。
により、鉗子部材4、5が全閉状態では突起4b、5b
とカム溝14b、14cとの接触角が小さいので大きな
力を発生させることができる。
合にも同様の動作をするが、全閉付近で短いストロ―ク
で大きく動く。柔らかいものを把持する鉗子では、把持
力が大きくなり過ぎず安全である。また、万一枢支ピン
13が破断した場合、突起4b、5bがカム溝14b、
14cの端部に引っ掛かるので鉗子部材4、5が脱落す
る事がない。
大きいため短いストロ―クで大きく開くことができる。
カム溝14b、14cの形状を変えることにより、力の
発生のさせ方を任意に選ぶことができる。
あり、ハンドル9a、9bに手指を掛けて操作すること
によって、駆動部材8がシース7の内部を後退し、連結
部材14も手元側に移動する。連結部材14の先端部1
4aに設けられたカム溝14b、14cが後退すること
によって、突起4b、5bがカム溝14b、14cの中
を摺動し、鉗子部材4、5は枢支ピン13を支点として
相対的に閉じる方向に回動する。
先端部14aは段差部4c、5cの間に挟まれたまま移
動する。これによって、先端部14aが挿入部2の軸回
りに回転することが防止され、突起4b、5bがカム溝
14b、14cに対して傾斜して係合する事を防止でき
る。
1の実施例と同一構成部分は同一番号を付して説明を省
略する。図7に示すように、鉗子部1の構造は基本的に
第1の実施例と同様であるが、カム溝14b、14cの
位置を前後方向(挿入部2の軸方向)にずらしてある。
と、段差部4c、5cの間に嵌挿した連結部材14の先
端部14aとの位置関係を示す。突起4b、5bはそれ
ぞれ挿入部2の長手方向の軸と直交する方向に延びてお
り、これら突起4b、5bはともに前記軸を越えて延び
ているので、干渉しないように前後に位置をずらして設
けられている。
14cの底面に向かって突出しているが、カム溝14
b、14cは突起4b、5bの先端と接触しないように
形成されている。この結果、カム溝14b、14cは一
ケ所で交わる。
突起4b、5bはカム溝14b、14cの中でそれぞれ
摺動する。この結果、鉗子部材4、5は枢支ピン13を
支点として回動し開閉動作を行う。このように2つの突
起4b、5bを軸方向にずらして配置したので、突起4
b、4bを長く、カム溝14b、14cを深くすること
ができ、突起4b、4bとカム溝14b、14cとの接
触面積が増し耐久性を向上させることができる。
と同一構成部分は同一番号を付して説明を省略する。連
結部材14の先端部14aに設けられたカム溝14b、
14cの先端部側を開放形状としてある。なお、開放す
るのは先端側のみにとどまらず、後端側でも構わない。
際、鉗子部材4、5と連結部材14とを組み合わせた状
態で、保持部材12に挿入する必要がないので組立が容
易である。
例と同一構成部分は同一番号を付して説明を省略する。
突起4b、5bを鉗子部材4、5とは別の部品としたも
のである。すなわち、鉗子部材4、5の後端部にねじ穴
4e、5e(一方のみ図示)を形成し、このねじ穴4
e、5eに突起としてのピン部材15をそれぞれ捩じ込
み固定したものである。
熱処理によって硬化できるステンレス鋼で形成し、硬質
クロムの被膜を10μm〜30μmの厚さで形成する。
これはビッカ―ス硬度800〜1000である。被膜は
CVDまたはPVDによる炭化チタンと窒化チタンの2
層のセラミックコ―トでもよい。これはビッカ―ス硬度
2000〜3000である。
摺動するピン部材15の摩耗を少なくすることにより、
鉗子の耐久性を向上することができる。鉗子部材4、5
と異なる材質を使用することができるので、靭性の高い
材質を使用して安全性を高めることができる。
ばね用ステンレス鋼板や圧延鋼板を使用して、塑性加工
により安価に製造することも可能となる。
例と同一構成部分は同一番号を付して説明を省略する。
図11は鉗子部材4の断面を示す。刃部4a、研磨面4
f、逃げ面4gがあり、鉗子部材5でも同様である。
TiCの被膜4hとその上のTiNの被膜4iとを形成
してある。2層の被膜4h、4iを形成した後、調質
(焼き入れ、焼き戻し)により、硬度、靭性を増加させ
てある。
例と同一構成部分は同一番号を付して説明を省略する。
図12は鉗子部材4の断面を示す。鉗子部材4の基材の
表面全面にTiC、TiNの層で覆ったものであり、研
磨面4fは存在しない。
同士の接触の強さの方が有利な場合がある。動脈のよう
な厚い筋層からなるものや、筋、腱のような靭性に富む
もの、あるいは骨や半月板の場合がこの例である。研磨
によって刃を付ける加工を除き、CVDのままとするこ
とにより、被膜の断面が露出しないので剥離に対して強
く、コスト的にも有利である。
すもので、第1の実施例と同様に、一対の鉗子部材4、
5は保持部材12に枢支ピン13によって回動自在に枢
支されている。鉗子部材4、5の後端部にはそれぞれカ
ム溝4b、5bが設けられている。
の表面にはCVDによりTiC、TiNの被膜が形成さ
れている。連結部材14の先端部14aは偏平な形状と
してあり、鉗子部材4、5の後端部のカム溝4b、5b
に相当する位置に形成した段差部4c、5cの間に嵌挿
されている。
設けられ、この孔20には連結ピン21が嵌合されてい
る。連結ピン21の表面には硬質クロムの被膜が形成さ
れている。被膜の厚さは10μm〜30μmである。
後端部に設けられた傾斜した直線状のカム溝4b、5b
の双方に係合している。なお、カム溝4b、5bは円弧
状に湾曲した形状でもよく、カム溝4b、5bの形状を
任意の曲線とすることもできる。
ドル9a、9bを操作することによって、駆動部材8が
前進し、連結部材14を介して連結ピン21も先端側に
移動する。連結ピン21がカム溝4b、5bの中を移動
することによって鉗子部材4、5は枢支ピン13を支点
として相対的に開く方向に回動する。また、鉗子部材
4、5を閉じる操作は前述と逆である。
1とカム溝4b、5bとの接触角が小さいので大きな力
を発生させることができる。万一支点ピン13が破断し
ても、連結ピン21がカム溝4b、5bの端部に引っか
かるので鉗子部材4、5が脱落することはない。
大きいため短いストロ―クで大きく開くことができる。
カム溝4b、5bの形状を変えることにより、力の発生
のさせ方を任意に選ぶことができる。
4の先端部14aは段差部4b、5bの間に挟まれたま
ま移動する。これによって先端部14aが挿入部2の軸
の回りに回転することが防止され、連結ピン21がカム
溝4b、5bに対して係合することを防止できる。
a、5a同士の摺動部に硬質の被膜を形成したことによ
り、摩耗によって刃部が変形して切れ味が劣化すること
がない。また、摩耗の懸念がないので、大きい圧着力を
かけて、靭性の高い切れ難い対象物を切断することがで
きる。
ナセラミックやジルコニアセラミックと同等の硬度があ
りながら良好な導電性を持っている。これにより高周波
を併用して止血や凝固を行うことができる。窒化チタン
の被膜自体の色は金色である。このため被膜の有無が一
目で判別できる。
とができる。さらに、基材表面に析出させるため、被膜
形成直後の表面は完全に艶消しの状態で、反射防止効果
が高く、内視鏡で観察したときハレ―ションが起こり難
い。
高い。このためステンレス鋼や炭素鋼の焼き入れ温度に
耐える耐熱性を持っている。さらに、被膜形成後の熱処
理の温度を自由に設定することができ、望みの硬度、靭
性を得ることができる。
度2000〜3000と極めて硬い。このため傷がつき
難い。また、通常の洗浄では大きな力で擦ることにより
短時間で洗浄を終えることができる。
ば、鉗子部を枢支部を支点として回動する一対の鉗子部
材によって構成し、この鉗子部材の後端部に突起を設
け、駆動部材の先端部に前記突起と係合するカム溝を形
成し、前記駆動部材の進退動作によって鉗子部を開閉す
ることを特徴とする。
鉗子部材の後端部が鉗子本体より外側に突出することが
ないので、把持したり、切断する際の操作性が向上する
とともに、開閉機構に破損が発生した場合もトラカ―ル
等に引っ掛かることなく安全に引き抜くことができると
いう効果がある。
を示す縦断側面図。
面図。
を示す縦断側面図。
を示す縦断側面図。
とカム溝との係合状態を示す断面図。
断面図
断面図
の縦断側面図。
断側面図。
な一対の鉗子部材によって形成され、鉗子部材の後端部
にはカム溝が設けられている。また、前記操作部によっ
て進退駆動される駆動部材の先端部には係合ピンが突設
され、この係合ピンは前記カム溝に係合しており、駆動
部材の進退によって鉗子部材が枢支ピンを支点として開
閉されるようになっている。
材に形成してあるので摺動面が硬く、対する係合ピンは
接触部の面積が小さいので更に硬い材料を用いなければ
ならない。これは設計製造の困難さを増す。
8と一体的に設けられ、駆動部材の一部をなす連結部材
14が軸方向に進退自在に挿入されている。
その中途部にはOリング14eが嵌合され、保持部材1
2との間をシールしている。さらに、連結部材14の先
端部14aの幅(高さ)は後端部14dの径より大き
く、先端部14aの後端側は後端部14dより外側に張
り出した後端面14fに形成されている。
4の先端部14aは段差部4b、5bの間に挟まれたま
ま移動する。これによって先端部14aが挿入部2の軸
の回りに回転することが防止され、連結ピン21がカム
溝4b、5bに対して傾斜して係合することを防止でき
る。
Claims (1)
- 【請求項1】 先端部に開閉自在な鉗子部、基端部に操
作部を設けた鉗子本体と、この鉗子本体に設けられ前記
操作部の操作によって進退し前記鉗子部を開閉する駆動
部材とからなる鉗子において、前記鉗子部を枢支部を支
点として回動する一対の鉗子部材によって構成し、この
鉗子部材の後端部に突起を設け、前記駆動部材の先端部
に前記突起と係合するカム溝を形成し、前記駆動部材の
進退動作によって鉗子部を開閉することを特徴とする鉗
子。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP07825393A JP3390041B2 (ja) | 1993-04-05 | 1993-04-05 | 鉗 子 |
US08/218,976 US5496347A (en) | 1993-03-30 | 1994-03-28 | Surgical instrument |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP07825393A JP3390041B2 (ja) | 1993-04-05 | 1993-04-05 | 鉗 子 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06285078A true JPH06285078A (ja) | 1994-10-11 |
JP3390041B2 JP3390041B2 (ja) | 2003-03-24 |
Family
ID=13656840
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP07825393A Expired - Fee Related JP3390041B2 (ja) | 1993-03-30 | 1993-04-05 | 鉗 子 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3390041B2 (ja) |
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