JP2017192710A - 電気手術装置 - Google Patents
電気手術装置 Download PDFInfo
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Abstract
Description
ハンドルと、
ハンドルから伸びており、器具のための長手方向軸を定めている細長いシャフトと、
細長いシャフト内に位置付けられた刃アセンブリであって、その遠位端に、切断刃を含み、その近位端で、ハンドル内のコンポーネントに接続されている刃アセンブリと、
ハンドル上に位置付けられ、第1の位置と第2の位置との間で可動であるトリガ機構で
あって、該トリガ機構のその第1の位置からその第2の位置への動きが、ハンドル内のコンポーネントの移動と、それに伴う切断刃の長手方向移動とを引き起こす、トリガ機構と、
を含み、
コンポーネントは、チャンバを中に有するケーシングを含み、チャンバは、刃アセンブリの近位端を受け入れるような大きさにされており、ケーシングは、チャンバに通じる開口を提供するために少なくとも1つの肩部を含み、開口は、チャンバの幅よりも幅が狭く、
刃アセンブリの近位端は、刃アセンブリが器具の長手方向軸に対して所定の角度で開口に臨むときに、開口の幅よりも狭い第1の幅を示すような、輪郭にされ、
刃アセンブリが器具の長手方向軸に対して上記所定の角度で開口に臨むときは、刃アセンブリの近位端がチャンバに挿入されることが可能であるように、且つ、前記刃アセンブリの前記近位端は、刃アセンブリが器具の長手方向軸に沿って移動されるときは、刃アセンブリの近位端がチャンバ内に拘束されるように、刃アセンブリの近位端の輪郭は、刃アセンブリが器具の長手方向軸と一直線上にある開口に臨むときに、開口の幅よりも広い第2の幅を示すような輪郭である、ことを特徴とする。
近位端に接続されたコンポーネントを有し、トリガ機構及びコンポーネントの配置は、トリガ機構のその第1の位置からその第2の位置への動きが刃アセンブリの長手方向移動を引き起こすような配置である。また、コンポーネントは、第1の形状輪郭の内部空洞を含み、刃アセンブリの近位端は、第2の形状輪郭であり、第1の形状輪郭及び第2の形状輪郭は、刃の近位端が長手方向軸に対してある角度で内部空洞に挿入されることを可能にするように、且つ、刃が長手方向軸に向けて回転されたときに刃の近位端を内部空洞内に固定するように、選択される。しかるがゆえに、器具内での刃の容易な組み付けが可能になる。
刃アセンブリの近位端を、器具の長手方向軸に対してある角度でコンポーネントに臨ませることと、
刃アセンブリの近位端を、臨ませた角度でコンポーネントの内部空洞内に受け入れることと、
刃アセンブリの近位端を内部空洞内に固定するために、刃アセンブリを長手方向軸に向けて回転させることと、
を含み、刃アセンブリの近位端、及びコンポーネントの内部空洞は、臨ませた角度で刃アセンブリの近位端を内部空洞内に受け入れることを可能にするために、且つ刃アセンブリの回転時及び回転後に刃アセンブリの近位端を内部空洞内に固定するために、それぞれの協働する形状である。
図1は、本発明の一例にしたがった電気手術器具1を示している。器具1は、近位側のハンドル部分10と、該近位側ハンドル部分から遠ざかる遠位方向に伸びる外側シャフト12と、該外側シャフトの遠位端に取り付けられた遠位端エフェクタアセンブリ14とを含む。エンドエフェクタアセンブリ14は、例えば、開閉するように配置された対向する1組の挟持部であってよく、対向する挟持部の内表面上に又は内表面として配置された1つ以上の電極を含み、これらの電極は、使用時に、組織の封止又は凝固のための電気手術高周波(RF)信号を受信するための接続部を有する。挟持部は、更に、ユーザによって作動されたときに機械的な切断刃などが突出しえるスロット又はその他の開口部を、対向する内表面内に提供される。使用時には、ハンドル10は、ユーザによって、挟持部14間に組織をクランプするために第1の方式で作動され、電極にRF電流を供給して組織を凝固させるために第2の方式で作動される。挟持部14は、器具1の能動構成要素が常に見えているようにするために湾曲されてよい。これは、使用時におけるユーザの装置視野を妨げる人体領域の手術に使用される血管封止装置において重要である。ハンドル10は、刃を挟持部14間に突出させそれによって間にクランプされた組織を切断させるために、ユーザによって、第3の方式で作動されてよい。必要とされる切断及び封止が完了したら、ユーザは、挟持部14から組織を解放させることができる。
止させるためのスイッチ26と、異なる角度から組織に到達するために挟持部14を回転させるための回転ホイール28とを含む。しかるがゆえに、ハンドル10の構成は、器具1及びその全ての機能が片手を使用して操作できて、操作のための全ての機構が容易にアクセス可能であるような構成である。
ト316は、カムスロット402の中の駆動ピン400によって挟持部14に結合され、これによって、カムスロット402内における駆動ピン400の動きが、挟持部14を開位置と閉位置との間で動かす。駆動シャフト316と、外側シャフト12と、挟持部14との間の結合は、駆動シャフト316の回転運動が外側シャフト12及び挟持部14に伝達されるような結合である。
28の波形部分336が突き出すための2つの開口332、334を有する。2つの開口332、334は、ハンドルの各側で互いに相対しており、台形状である。具体的には、台形状の孔は、ハンドルの長手方向軸に直交する平行の辺を有し、これらの平行辺は、一方の辺がもう一方の辺よりも長く、長い方の辺が孔の前方端に、短い方の辺が孔の後方端にある。波形部分336は、ユーザの親指又はそれ以外の指に快適になじむように、適宜に傾斜されている。これに関して、波形部分336は、図14a〜bに示されるように、回転面に対して一定の角度で切り取られている。具体的には、波形部分の傾斜部分の角度は、回転ホイール28の領域における外部ケーシングの角度に実質的に等しいことが望ましい。
装置の全体的な構成が説明されたところで、次は、使用時における電気手術器具1の全体的な動作が論じられる。その後、装置の特定の態様の構成及び動作に関して更に詳細な説明がなされる。
挟持部14間に組織をクランプするために、ユーザは、クランプハンドル22を、ラッチ324がケーシング20内のラッチ成形物326に係合するまでケーシング20の近位端328に向かって握り込む。この動きは、図8e〜fによって示されるように、駆動ハンドル22をそのヒンジ306を中心に枢動させ、図4及び図5aによって示されるように、カラー304の端をフランジ800に対して押し付けて、カラー成形物310、バネ、及び内側成形物314を駆動シャフト316に沿って近位方向に推し進める。上述のように、内側成形物314は、突出部材602を通じて駆動シャフト316に取り付けられる。したがって、内側成形物314が軸方向に押し戻されるのに伴って、駆動シャフト316も軸方向に移動され、これは、挟持部14のカムスロット402の中のピン400を駆動し、それによって、挟持部14を閉じさせる。しかるがゆえに、駆動ハンドル22からの荷重は、カラー成形物310、バネ312、及び内側成形物314のバネ機構を通じて駆動シャフト316に伝達される。
挟持部14間に組織がクランプされると、挟持部14は、図26a〜fによって示されるように、駆動ハンドル上のラッチ324をケーシング20の内部のラッチ成形物326
に係合させることによって閉位置にロックできる。ラッチ324は、開口1102を通ってケーシング20に入るのに伴って、ラッチ成形物326に係合し、該成形物326をケーシング20内で押し下げ、それによってバネ1104を伸長させる。図26b〜cに示されるように、ラッチ324は、カム経路1106の側面上を、その最大位置に到達するまで駆け上る。この地点で、駆動ハンドル22は、これ以上圧縮できず、バネ1104は、図26dに示されるように、ラッチ324がカム経路1106の「V」字型ポケットに嵌り込んで駆動ハンドル22を圧縮位置に及び挟持部14を閉位置に保持するように、ラッチ成形物326をケーシング20の内部へ引き戻す。
挟持部が閉位置にある間、ユーザは、間にクランプされた組織を切断する必要があるかもしれない。組織を切断するために、駆動アセンブリの作動によって、挟持部14間で刃340が駆動される。
使用時に、ユーザは、器具1全体を動かす必要なく様々な角度から組織に到達する必要があるかもしれない。したがって、挟持部14は、回転ホイール28によってハンドル10に相対的に回転可能であることが有利である。これは、挟持部14が図16a〜dに示されるような湾曲した走路上にある場合に特に有益である。上述のように、回転ホイール28は、内側成形物314が回転ホイール28とともに回転するように、かみ合い部材1200、1202を通じて内側成形物314に連結される。駆動シャフト316の端が内側成形物314に接続されているので、駆動シャフト316も回転し、この回転は引き続き、反対側の端にある挟持部14を回転させる。
挟持部14が閉位置にある間、ユーザは、間にクランプされた組織を凝固させること及び封止することを望むかもしれない。これを行うために、ユーザは、ケーシング20頂部のスイッチボタン26を使用して、電極の活性化を開始させる。スイッチボタン26は、ユーザが装置を片手で使用している間に容易にボタン26にアクセスできるように、適宜に配置されている。この際は、組織を凝固させる及び封止するために、適切なRF信号が挟持部14の中の電極に送られる。RF信号は、所望の効果に応じて純粋波形又は混合波形であってよい。
上述のように、電気手術器具1の近位ハンドル部分10は、遠位エンドエフェクタアセンブリ14の一態様をこのエンドエフェクタアセンブリ14が第1の状態と第2の状態との間で動くように作動させるための、第1の機構を含む。例えば、エンドエフェクタアセンブリ14は、開閉するように配置された対向する1組の挟持部14であってよい。これらの挟持部14の動きをトリガするために使用される機構は、駆動ハンドル22と、2つのたる型成形物310、314と、それらの間で圧縮されるバネ312とを含むいわゆるクランプ機構であり、駆動ハンドル22、成形物310、314、及びバネ312は、図4及び図5a〜bに示されるように、全て、挟持部14とハンドル10との間に伸びる細長い棒316に沿って装着される。
平らに押しつぶされる。
次に、切断機構の構造及び動作に関する様々な更なる特徴及び態様が説明される。上述のように、電気手術器具1の近位側のハンドル部分10は、遠位側のエンドエフェクタアセンブリ14の更なる態様を作動させるための第2の機構を含む。例えば、エンドエフェクタアセンブリ14は、1組の対向する挟持部14、及び刃340であってよく、刃340の遠位端は、挟持部14間にクランプされた組織を切断するために、上記挟持部14間で滑動するように配置される。駆動シャフト316の中心走路341内に配された刃340の動きをトリガするために使用される機構は、いわゆる切断機構である。切断機構は、駆動アーム2000と、刃駆動成形物346と、刃カラー成形物348と、刃成形物352と、引っ張りバネ350とを含み、これらは全て、結合されて、図20a〜b、図31、及び図32に示されるような3枢着スライダ−クランク機構を形成する。
囲に小さい溝2202を提供される。遠位側のリップ2200は、刃成形物352がチャンバ2104内で自由に回転することを可能にしつつ、刃成形物352を刃カラー成形物348内で保持するために、溝2202と合わさる。しかるがゆえに、刃成形物352及び刃カラー成形物348は、同心状に自由に回転することができる。
ように、トリガ24には、ユーザによって一定の力が加えられる。機構は、このトリガ力を初期の高い刃340力に変換し、この力は、刃340が走路342に沿って動かされるのに伴って減少し、刃340が挟持部14に到達するのに伴って再び増加する。したがって、図28a〜bによって示されるように、枢着点Bがその後退位置から、β>90度になるようにその伸展位置へ動くのに伴って、刃カラー348及び刃成形物352が駆動シャフト316に沿って動かされる速度が加速し、その結果、刃340の力が増加する。しかるがゆえに、機構は、ユーザが追加の力をトリガ24に加える必要なく、挟持部14間にクランプされた組織を効果的に切断するのに十分な力で刃340を動かされることができる。
材料又はその他の低摩擦性ポリマ複合材料などの、低摩擦性材料又は付着防止材料でコーティングされてよい。
次に、駆動シャフト316の構造に関する様々な更なる特徴及び態様が説明される。上述のように、駆動シャフト316は、図10aによって示されるように、「T」字型の断面を有する細長い棒である。駆動シャフト316は、上述された切断機構に使用される切断刃340などの更に細長い部材を収容するのに適したスロット又は走路342をその長さに沿って含む。使用時に、切断刃340は、挟持部14間にクランプされた組織を切断するために切断刃340の遠位端を挟持部14間で駆動できるように、駆動シャフト316の長さに沿って滑動させられる。
次に、サムホイール(本書では回転ホイールとも呼ばれる)28の動作に関する様々な更なる特徴及び態様が説明される。サムホイール28は、エンドエフェクタアセンブリ14が上に搭載された外側シャフト12をユーザが回転させることを可能にするために提供される。しかしながら、スペースを削減し、それによって、よりコンパクトな器具を作成するためには、サムホイール28の内部容積1300も、前述のクランプ機構の一部を形成する内側成形物314のための移動スペースを提供するために用いられる。このような配置によって、よりコンパクトな機構が得られる。
、これは、ホイール周囲の地点における器具の外壁の角度に対して、及びとりわけホイールのすぐ前における器具の外壁部分の角度に対して接線方向であることがわかる。回転ホイールの外縁における角度付けされた波形がホイール周囲における器具の壁の角度付けに一致するこのような配置は、外科医によって容易に操作可能な快適で且つ人間工学的な設計を提供する。
形物314が使用時にホイール28の内部空洞内で端から端へ滑動はしえるがホイール28内で回転はしえないように提供される。その代わりに、相互に作用するかみ合い部材1202、1200は、内側成形物314が回転ホイール28の回転に伴って回転ホイール28とともに回転するように機能する。このように、ユーザ28によって回転ホイール28に加えられた回転トルクは、エンドエフェクタを載せた駆動シャフト316を回転させるために、内側成形物314に伝達されて次いで駆動シャフトに伝達される。図29a及び図29bは、サムホイール28の内部空洞に挿入された内側成形物314を示しており、内側成形物314がどのようにしてホイール28の内部空洞1300内で軸方向に滑動しえるかを説明している。
上述のように、エンドエフェクタ14を上に有するシャフト12は、組織の切断及び凝固のためにエンドエフェクタが所望の回転位置へ動かされることを可能にする。しかしながら、エンドエフェクタへの配線接続が、一方向に極端に回転されているシャフトからの過度なひずみ下に置かれて配線が巻き上がる、捻じれる、又は過度なひずみを受けることがないようにするためには、シャフト12の回転を制御するための機構が必要であり、特に、回転の量を制限しそれによって配線が受ける過度なひずみを阻止するための機構が必要である。また、シャフト12の回転のポシティブ制御の提供は、使用時における器具の人間工学的経験を向上させ、ユーザの知覚の質を高める。
ング1506の外周に接触するように上方に突き出している。ストッパー1502は、リングの軸に対するケーシング上におけるそれらの位置決めゆえにストッパー1504よりも小さいが、ストッパー1502、1504は、ともに、角度付けされたガイド上面1510、1512(図15aを参照)をそれぞれ有する。これらのガイド上面は、リング1506の外周表面に接触してサムホイールの一部を形成し、サムホイールをその回転において支持及び誘導する。
次に、ハンドル2内における配線に関する様々な更なる特徴及び態様が説明される。上述のように、何らかの適切な回路構成を通じてエンドエフェクタアセンブリ14の中の電極を作動させるためのRF信号を活性化及び非活性化するために、例えば小型プリント回路基板(PCB)338上の2つの侵入保護スイッチなどのスイッチボタン26が提供される。図17に示されるように、PCB338は、ジェネレータ(不図示)からのRF出力を受信するための接続コード1700、並びにRF電流を挟持部14の中の電極に供給するための、例えば1本は活性電極のための及びもう1本は戻り電極のための電気配線1702、1704に接続される。
て外側シャフト12を遡ってシャフト成形物320に至るように引かれる。図9bに示されるように、シャフト成形物320は、外側シャフト12を受け入れるための開口912を遠位端に有する円筒状の又はたる型のコンポーネントである。外側シャフト12は、例えば、シャフト成形物320内の対応する切り込み902と協働するスナップ式のタブ900によって、シャフト成形物320に取り付けられる。したがって、もし、シャフト成形物320が回転すると、それとともに、外側シャフト12も回転する。シャフト成形物320は、更に、近位端に更なる孔914を含み、該孔914は、駆動シャフト316を受け入れられるように「T」字型の形状を有し、駆動シャフト316は、シャフト成形物320の内部空洞1802を通って外側シャフト12の長さにわたって伸びる。しかるがゆえに、駆動シャフト316は、シャフト成形物320内で及び外側シャフト12内で滑動することができ、しかしながら、駆動シャフト316の回転運動は、シャフト成形物320に及びそれに続いて外側シャフト12に伝達される。
04、1906による回路の短絡を引き起すかもしれないあらゆる流体からコンタクト1904、1906を保護するためにポケット1900、19200の浸透性を最小限に抑えるために、重要である。
次に、装置に使用されてよいエンドエフェクタアセンブリの例が説明される。説明される例は、完全を期すために与えられるものであり、駆動シャフト316によって駆動可能でありさえすれば、その他の設計のエンドエフェクタが器具に使用されてもよいことが、理解されるべきである。要するに、本発明の実施形態は、本書で説明される特定のエンドエフェクタに限定されず、その他の設計のエンドエフェクタが使用されてもよい。
次に、図45を参照すると、使用時における器具1は、制御可能な高周波(RF)源を中に有する電気手術ジェネレータ4500に接続されるとされ、高周波源は、器具1のエンドエフェクタの電極を通じて与えられたときに組織を凝固させる又は封止するRF凝固信号を生成する。電気手術ジェネレータ4500は、ジェネレータがオン及びオフにされることを可能にするための、並びに制御対象とされている器具1にRF凝固信号の電力が供給されることを可能にするための、それぞれの制御入力スイッチ4504、4502を含む。これらに関して、電気手術ジェネレータ4500は、従来通りである。
したがって、以上の全てを考慮すると、本発明の実施形態は、高度な電気手術鉗子器具であって、ユーザによる容易で且つ人間工学的な片手操作を可能し、エンドエフェクタの回転柔軟性を提供し、把持されている組織に対してエンドエフェクタによって加えられる力を制御して、過度な力が加えられることを阻止し、把持されている組織を電気手術によって凝固又は封止させつつ、尚も簡便な機械的切断を同時に可能にする、電気手術鉗子器具を提供する。更に、器具は、それぞれの内部活性化機構内において利用可能なスペースの効率的使用を通じてコンパクトな器具を提供しつつ、尚も構築が単純で且つ低コストで
あるように設計されている。
Claims (19)
- 手術器具であって、
ハンドルと、
前記ハンドルから伸びており、前記器具のための長手方向軸を定めている細長いシャフトと、
前記細長いシャフト内に位置付けられた刃アセンブリであって、その遠位端に、切断刃を含み、その近位端で、前記ハンドル内のコンポーネントに接続されている刃アセンブリと、
前記ハンドル上に位置付けられ、第1の位置と第2の位置との間で可動であるトリガ機構であって、前記トリガ機構のその第1の位置からその第2の位置への動きが、前記ハンドル内の前記コンポーネントの移動と、それに伴う前記切断刃の長手方向移動とを引き起こす、トリガ機構と、
を備え
前記コンポーネントは、チャンバを中に有するケーシングを含み、前記チャンバは、前記刃アセンブリの前記近位端を受け入れるような大きさにされており、前記ケーシングは、前記チャンバに通じる開口を提供するために少なくとも1つの肩部を含み、前記開口は、前記チャンバの幅よりも幅が狭く、
前記刃アセンブリの前記近位端は、前記刃アセンブリが前記器具の前記長手方向軸に対して所定の角度で前記開口に臨むときに、前記開口の幅よりも狭い第1の幅を示すような、輪郭にされ、
前記刃アセンブリの前記近位端の前記輪郭は、前記刃アセンブリが前記器具の前記長手方向軸と一直線上にある開口に臨むときに、前記開口の幅よりも広い第2の幅を示すような輪郭であり、
それにより、前記刃アセンブリの前記近位端は、前記刃アセンブリが前記器具の前記長手方向軸に対して前記所定の角度で前記開口に臨むときは、前記チャンバに挿入されることが可能であり、且つ、前記刃アセンブリの前記近位端は、前記刃アセンブリが前記器具の前記長手方向軸に沿って移動されるときは、前記チャンバ内に拘束される、
ことを特徴とする手術器具。 - 請求項1に記載の手術器具であって、
前記刃アセンブリの前記近位端は、その幅又はその長さのいずれかを大幅に下回る厚さを有する棒の形態をとる、手術器具。 - 請求項2に記載の手術器具であって、
前記刃アセンブリの前記近位端は、その近位側の先端に、前記刃アセンブリの前記近位端の残りの部分の輪郭を超えて一方向に伸びるタブを含む、手術器具。 - 請求項3に記載の手術器具であって、
前記刃アセンブリの前記近位端は、前記タブに隣接する陥凹部分を含む、手術器具。 - 請求項4に記載の手術器具であって、
前記刃アセンブリの前記近位端は、タブの反対側に切り取り部を含む、手術器具。 - 請求項5に記載の手術器具であって、
前記切り取り部は、前記刃アセンブリに対して斜切された縁を含む、手術器具。 - 請求項5又は6に記載の手術器具であって、
前記第1の幅は、前記陥凹部分と前記切り取り部との間の距離によって構成される、手術器具。 - 請求項5ないし7のいずれか一項に記載の手術器具であって、
前記第2の幅は、前記タブと、前記切り取り部に隣接する前記刃アセンブリとの間の距離によって構成される、手術器具。 - 請求項4ないし8のいずれか一項に記載の手術器具であって、
前記陥凹部分は、前記刃アセンブリが前記所定の角度から前記長手方向軸に向けて回転されるのに伴って前記タブを前記チャンバ内へ誘導できるように、湾曲されている、手術器具。 - 請求項9に記載の手術器具であって、
前記肩部は、前記陥凹部分の輪郭に一致するように、湾曲されている、手術器具。 - 請求項1ないし10のいずれか一項に記載の手術器具であって、
前記ケーシングは、前記チャンバを画定している第1のピース及び前記肩部を画定している第2のピースの、2ピースアセンブリを含む、手術器具。 - 請求項11に記載の手術器具であって、
前記第2のピースは、前記第1のピースに回転可能式に接続される、手術器具。 - 請求項1ないし12のいずれか一項に記載の手術器具であって、更に、
前記細長いシャフトの遠位端に位置決めされたエンドエフェクタを備え、前記刃アセンブリは、前記エンドエフェクタの領域内で、その遠位端に切断刃を有する、手術器具。 - 請求項13に記載の手術器具であって、
前記エンドエフェクタは、1つ以上の電極を含む電気手術用エンドエフェクタである、手術器具。 - 手術器具であって、
ハンドルと、
前記ハンドルから伸びており、前記器具のための長手方向軸を定めている細長いシャフトと、
前記細長いシャフト内に位置付けられた刃アセンブリと、
前記ハンドル上に位置付けられ、第1の位置と第2の位置との間で可動であるトリガ機構であって、前記刃アセンブリの近位端に接続されたコンポーネントを有し、前記トリガ機構及び前記コンポーネントの配置は、前記トリガ機構のその第1の位置からその第2の位置への動きが前記刃アセンブリの長手方向移動を引き起こすような配置である、トリガ機構と、
を備え、前記コンポーネントは、第1の形状輪郭の内部空洞を含み、前記刃アセンブリの前記近位端は第2の形状輪郭であり、前記第1の形状輪郭及び前記第2の形状輪郭は、前記刃の前記近位端が前記長手方向軸に対してある角度で前記内部空洞に挿入されることを可能にするように、且つ、前記刃が前記長手方向軸に向けて回転されたときに前記刃の前記近位端を前記内部空洞内に固定するように、選択される、ことを特徴とする手術器具。 - 請求項15に記載の手術器具であって、
前記刃は、前記刃の前記近位端を前記コンポーネント内にロックするために、前記長手方向軸に平行になるように回転される、手術器具。 - 請求項16又は17に記載の手術器具であって、
前記内部空洞は、実質的にL字型の輪郭を有し、前記刃アセンブリの前記近位端は、対応する実質的にL字型の輪郭を有するが、前記L字型輪郭の幅をその角(かど)で狭くするために、前記L字の前記角(かど)の内表面及び外表面から材料が除去されている、手術器具。 - 手術器具を組み立てる方法であって、前記手術器具は、ハンドルと、前記ハンドルから伸びており、前記器具のための長手方向軸を定めている細長いシャフトと、前記細長いシャフト内に位置付けられた刃アセンブリと、前記ハンドル上に位置付けられ、第1の位置と第2の位置との間で可動であり、前記刃アセンブリの近位端を受け入れて保持するために前記刃アセンブリの前記近位端に接続されたコンポーネントを有するトリガ機構と、を有し、前記方法は、
前記刃アセンブリの前記近位端を、前記器具の前記長手方向軸に対してある角度で前記コンポーネントに臨ませることと、
前記刃アセンブリの前記近位端を、前記臨ませた角度で前記コンポーネントの前記内部空洞内に受け入れることと、
前記刃アセンブリの前記近位端を前記内部空洞内に固定するために、前記刃アセンブリを前記長手方向軸に向けて回転させることと、
を備え、前記刃アセンブリの前記近位端、及び前記コンポーネントの前記内部空洞は、前記臨ませた角度で前記刃アセンブリの前記近位端を前記内部空洞内に受け入れることを可能にするために、且つ前記刃アセンブリの回転時及び回転後に前記刃アセンブリの前記近位端を前記内部空洞内に固定するために、それぞれの協働する形状である、方法。 - 請求項18に記載の方法であって、
前記内部空洞は、実質的にL字型の輪郭を有し、前記刃アセンブリの前記近位端は、対応する実質的にL字型の輪郭を有するが、前記L字型輪郭の幅をその角(かど)で狭くするために、前記L字の前記角(かど)の内表面及び外表面から材料が除去されている、方法。
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