JP5244419B2

JP5244419B2 - Endoscope operation part

Info

Publication number: JP5244419B2
Application number: JP2008047087A
Authority: JP
Inventors: 憲幸杉田
Original assignee: Hoya Corp
Current assignee: Hoya Corp
Priority date: 2008-02-28
Filing date: 2008-02-28
Publication date: 2013-07-24
Anticipated expiration: 2028-02-28
Also published as: JP2009201713A

Description

この発明は内視鏡用処置具の操作部に関する。 The present invention relates to an operation unit of an endoscope treatment tool.

内視鏡用処置具は一般に、操作ワイヤが軸線方向に進退自在にシース内に配置され、その操作ワイヤを進退操作するための操作部がシースの基端に連結されている。そして、いわば消耗品であるシースと操作ワイヤを、操作部に対して着脱自在に構成したものが少なくない。 In general, an endoscope treatment instrument has an operation wire disposed in a sheath so as to be able to advance and retract in the axial direction, and an operation portion for operating the operation wire to be advanced and retracted is connected to a proximal end of the sheath. In many cases, the sheath and the operation wire, which are consumable items, are configured to be detachable from the operation unit.

そのような従来の内視鏡用処置具の操作部は、操作ワイヤの基端部に取り付けられた連結棒が、進退操作部材に設けられた係合孔に通され、係合孔を連結棒の軸線に対して垂直方向に移動させて係合孔の細幅部を連結棒に形成された括れ部に係合させることにより、連結棒が進退操作部材と一体的に移動する状態になるように構成されている（例えば、特許文献１）。また、操作ワイヤの基端を進退操作部材にビス止め固定したもの等もある（例えば、特許文献２）。
特開２００１−４６３９３特開２００１−４６３９２ In the operation portion of such a conventional endoscope treatment tool, the connecting rod attached to the proximal end portion of the operation wire is passed through the engaging hole provided in the advance / retreat operating member, and the engaging hole is connected to the connecting rod. The connecting rod is moved integrally with the advancing / retracting operation member by moving the narrow portion of the engaging hole to the constricted portion formed on the connecting rod by moving in the direction perpendicular to the axis of the connecting hole. (For example, Patent Document 1). In addition, there is a type in which the proximal end of the operation wire is fixed to the advance / retreat operation member with screws (for example, Patent Document 2).
JP 2001-46393 A JP 2001-46392 A

内視鏡用処置具において、操作ワイヤを基端側で軸線周り方向に回転させると、その回転が先端側に伝達されて先端の処置部材の向きが変わる。したがって、手元側から操作ワイヤを回転させてやれば、先端の処置部材の向きをある程度任意に制御することができる。 In the endoscope treatment instrument, when the operation wire is rotated in the direction around the axis on the proximal end side, the rotation is transmitted to the distal end side, and the direction of the distal treatment member changes. Therefore, if the operation wire is rotated from the hand side, the direction of the treatment member at the tip can be arbitrarily controlled to some extent.

しかし、特許文献１に記載された発明においては、操作ワイヤの基端に取り付けられた連結棒が操作部の係合孔内で回転してしまうので、操作部を回転させてもその回転が操作ワイヤに十分に伝達されず、先端の処置部材の向きを制御することができない。そのため、例えば高周波スネア等のような先端処置部材を患部に対し正確に臨ませる（即ち、患部を狙撃する）のに徒に時間がかかってしまう場合があった。 However, in the invention described in Patent Document 1, since the connecting rod attached to the proximal end of the operation wire rotates within the engagement hole of the operation portion, the rotation is operated even if the operation portion is rotated. The wire is not sufficiently transmitted to the wire, and the direction of the treatment member at the tip cannot be controlled. For this reason, for example, it may take time for a tip treatment member such as a high-frequency snare to accurately face the affected part (that is, to snip the affected part).

また、特許文献２に記載された発明では、ビスの締め付け作業が面倒であるだけでなく、ビスが少しでも緩むと操作ワイヤの基端が進退操作部材から外れてしまう欠点があるため実用性に乏しい。 Moreover, in the invention described in Patent Document 2, not only is the tightening operation of the screw troublesome, but there is a disadvantage that the base end of the operation wire is detached from the advance / retreat operation member when the screw is loosened even a little. poor.

本発明は、操作部を回転させることにより、操作ワイヤを軸線周り方向に確実に回転操作することができるようにして、患部を速やかに狙撃することができ、また、そのような操作ワイヤの基端を操作部に取り付ける際に容易かつ確実に取り付けが行われる内視鏡用処置具の操作部を提供することを目的とする。 According to the present invention, by rotating the operation unit, the operation wire can be reliably rotated in the direction around the axis, and the affected area can be quickly sniped. It is an object of the present invention to provide an operation portion of an endoscope treatment tool that is easily and reliably attached to an end when the end is attached to the operation portion.

上記の目的を達成するため、本発明の内視鏡用処置具の操作部は、シース内に軸線方向に進退自在に挿通された操作ワイヤの基端がシースの基端から引き出されて、その操作ワイヤの基端部に取り付けられた連結棒が操作ワイヤを軸線方向に進退操作するための進退操作部材に設けられた係合孔に通され、広幅部と細幅部とを有する係合孔を連結棒の軸線に対し垂直方向に移動させて係合孔の細幅部を連結棒に形成された括れ部に係合させることにより、連結棒が進退操作部材と一体的に移動する状態になるように構成された内視鏡用処置具の操作部において、連結棒の括れ部の断面形状を、あい対向する２辺が係合孔の細幅部に略内接する大きさの正方形状に形成し、係合孔の広幅部が連結棒の括れ部の断面形状の対角寸法より大きな幅に形成されると共に、係合孔の広幅部と細幅部との境界領域において係合孔の一方の縁部が細幅部より広い幅に切り欠かれて、その部分において係合孔が非対称形状に形成されたものである。 In order to achieve the above object, the operation portion of the endoscope treatment tool according to the present invention is configured such that the proximal end of the operation wire that is inserted into the sheath so as to advance and retract in the axial direction is drawn from the proximal end of the sheath. An engagement hole having a wide width portion and a narrow width portion through which a connecting rod attached to a proximal end portion of the operation wire is passed through an engagement hole provided in an advance / retreat operation member for advancing / retreating the operation wire in the axial direction. Is moved in a direction perpendicular to the axis of the connecting rod to engage the narrow portion of the engaging hole with the constricted portion formed on the connecting rod, so that the connecting rod moves integrally with the advance / retreat operation member. in operation unit configured endoscopic treatment tool such that the cross-sectional shape of the constricted portion of the connecting rod, opposing two sides in a square shape of substantially the contact size in the narrow portion of the engaging hole formed, the greater width than the diagonal dimension of the cross-sectional shape of the constricted portion of the wide portion connecting rod of the engaging hole In addition, one edge of the engagement hole is notched to a width wider than the narrow width portion in the boundary region between the wide width portion and the narrow width portion of the engagement hole, and the engagement hole is asymmetrical in that portion. It is formed .

本発明によれば、操作ワイヤの基端部に取り付けられた連結棒の括れ部の断面形状をあい対向する２辺が係合孔の細幅部に略内接する大きさの多角形状に形成したことにより、操作部全体を回転操作すれば操作ワイヤが軸線周り方向に確実に回転して、患部を速やかに狙撃することができ、連結棒の括れ部の断面形状が正方形状に形成されている場合には、その対角寸法より大きな幅に係合孔の広幅部を形成すると共に、係合孔の広幅部と細幅部との境界領域において係合孔の一方の縁部が細幅部より広い幅に切り欠いて、その部分において係合孔を非対称形状に形成することにより、操作ワイヤの基端を操作部に取り付ける際に容易かつ確実に取り付けが行われる。 According to the present invention, the cross-sectional shape of the constricted portion of the connecting rod attached to the proximal end portion of the operation wire is formed in a polygonal shape having a size in which two opposing sides are substantially inscribed in the narrow width portion of the engagement hole. Thus, if the entire operation portion is rotated, the operation wire is reliably rotated in the direction around the axis, and the affected portion can be quickly sniped, and the cross-sectional shape of the constricted portion of the connecting rod is formed in a square shape. In this case, the wide portion of the engagement hole is formed to have a width larger than the diagonal dimension, and one edge of the engagement hole is a narrow portion in the boundary region between the wide portion and the narrow portion of the engagement hole. By cutting out to a wider width and forming the engagement hole in an asymmetric shape at that portion, the base end of the operation wire is easily and reliably attached to the operation portion.

シース内に軸線方向に進退自在に挿通された操作ワイヤの基端がシースの基端から引き出されて、その操作ワイヤの基端部に取り付けられた連結棒が操作ワイヤを軸線方向に進退操作するための進退操作部材に設けられた係合孔に通され、広幅部と細幅部とを有する係合孔を連結棒の軸線に対し垂直方向に移動させて係合孔の細幅部を連結棒に形成された括れ部に係合させることにより、連結棒が進退操作部材と一体的に移動する状態になるように構成された内視鏡用処置具の操作部において、連結棒の括れ部の断面形状が正方形状に形成されて、その対角寸法より大きな幅に係合孔の広幅部が形成されると共に、係合孔の広幅部と細幅部との境界領域において係合孔の一方の縁部が細幅部より広い幅に切り欠かれて、その部分において係合孔が非対称形状に形成されている。 The proximal end of the operating wire inserted into the sheath so as to be movable back and forth in the axial direction is pulled out from the proximal end of the sheath, and the connecting rod attached to the proximal end of the operating wire moves the operating wire forward and backward in the axial direction. The engagement hole provided in the advancing / retreating operation member is moved, and the engagement hole having the wide part and the narrow part is moved in the direction perpendicular to the axis of the connecting rod to connect the narrow part of the engagement hole. In the operation portion of the endoscope treatment instrument configured to engage with the constricted portion formed on the rod so that the connecting rod moves integrally with the advance / retreat operation member, the constricted portion of the connecting rod The cross-sectional shape of the engagement hole is formed in a square shape, the wide portion of the engagement hole is formed to have a width larger than the diagonal dimension, and the engagement hole is formed in the boundary region between the wide portion and the narrow width portion of the engagement hole. One edge is cut out to be wider than the narrow part, and it engages at that part There are formed asymmetrical.

以下、図面を参照して本発明の実施例を説明する。
図２は内視鏡用処置具の全体構成の一例を示しており、図示されていない内視鏡の処置具挿通チャンネルに挿脱される可撓性シース１の先端には、例えばスネアループ等のような先端処置部材２が可撓性シース１の先端から突没自在に配置されている。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 2 shows an example of the overall configuration of the endoscope treatment instrument. At the distal end of the flexible sheath 1 inserted into and removed from the endoscope treatment instrument insertion channel (not shown), for example, a snare loop The distal treatment member 2 as described above is disposed so as to protrude and retract from the distal end of the flexible sheath 1.

そして、可撓性シース１内に全長にわたって挿通配置された導電性の操作ワイヤ３の先端が先端処置部材２の後端に連結されている。なお、先端処置部材２がスネアループ以外のものであっても差し支えない。 And the front-end | tip of the electroconductive operation wire 3 inserted and arranged over the full length in the flexible sheath 1 is connected with the rear end of the front-end | tip treatment member 2. FIG. The distal treatment member 2 may be other than the snare loop.

可撓性シース１の基端が連結された操作部本体１１は、前後方向に細長い棒状に形成されて、中心軸線位置を通る前後方向に細長いスリット１２により、前後両端付近の領域を除いて左右に分断された形状に形成されている。 The operation unit main body 11 to which the proximal end of the flexible sheath 1 is connected is formed in a long and narrow bar shape in the front-rear direction, and left and right except for a region near both front and rear ends by a long and narrow slit 12 passing through the center axis position. It is formed in a shape divided into two.

操作部本体１１の後端部には、術者の手の第１指を係合させるための固定指掛け１３が設けられている。１５は、操作部本体１１に対して可撓性シース１の基端を着脱する際に回転操作される操作輪である。 A fixed finger hook 13 for engaging the first finger of the operator's hand is provided at the rear end of the operation unit main body 11. Reference numeral 15 denotes an operation wheel that is rotated when the proximal end of the flexible sheath 1 is attached to or detached from the operation unit main body 11.

操作ワイヤ３の基端部分は、可撓性シース１の基端から操作部本体１１のスリット１２内に引き出されていて、スリット１２内において進退操作部材１６に着脱自在に連結されている。進退操作部材１６には、操作者の第２指と第３指を係合させるための移動指掛け１７が形成されている。 The proximal end portion of the operation wire 3 is drawn from the proximal end of the flexible sheath 1 into the slit 12 of the operation portion main body 11, and is detachably connected to the advance / retreat operation member 16 in the slit 12. The forward / backward operation member 16 is formed with a moving finger hook 17 for engaging the operator's second and third fingers.

したがって、固定指掛け１３に対して移動指掛け１７を移動操作することにより、操作ワイヤ３を可撓性シース１内で軸線方向に進退させて、先端処置部材２を可撓性シース１の先端から突没（又は開閉等）させることができる。 Therefore, by moving the movable finger hook 17 with respect to the fixed finger hook 13, the operation wire 3 is advanced and retracted in the axial direction within the flexible sheath 1, and the distal treatment member 2 is projected from the distal end of the flexible sheath 1. It can be submerged (or opened and closed).

図３と図４は、そのような内視鏡用処置具の操作部の側面断面図と平面断面図であり、操作部本体１１の先端部分には、可撓性シース１の基端に固着された接続口金５が着脱自在に連結され、そこでは、ダルマ状の孔が形成された口金押え部材１４に接続口金５の括れ部が通されて係合している。 3 and 4 are a side sectional view and a plan sectional view of the operation portion of the endoscope treatment tool, and the distal end portion of the operation portion main body 11 is fixed to the proximal end of the flexible sheath 1. The connected base 5 is detachably coupled, and the constricted portion of the connection base 5 is passed through and engaged with the base presser member 14 in which a Dalma-shaped hole is formed.

即ち、図４におけるＶ−Ｖ断面を図示する図５（Ａ）に示されるように、口金押え部材１４に形成されたダルマ状の孔の径の小さな部分に接続口金５の括れ部が係合した状態では、接続口金５がそこから離脱することができず、可撓性シース１が操作部本体１１に連結された状態になっている。 That is, as shown in FIG. 5A illustrating the VV cross section in FIG. 4, the constricted portion of the connection base 5 is engaged with the small portion of the Dalma-shaped hole formed in the base pressing member 14. In this state, the connection cap 5 cannot be detached therefrom, and the flexible sheath 1 is connected to the operation portion main body 11.

そして、図５（Ｂ）に示されるように、その部分の周囲を囲んで軸線周りに回転自在に配置された操作輪１５を回転操作すると、それと共に口金押え部材１４が回転して、操作部本体１１から前方に突出形成された庇部１１ａとの位置関係の変化により、口金押え部材１４に形成されたダルマ状の孔の径の大きな部分に接続口金５が係合する状態になる。その結果、接続口金５をそこから離脱させることができ、可撓性シース１を操作部本体１１から取り外すことができる。 Then, as shown in FIG. 5 (B), when the operation wheel 15 that surrounds the portion and is rotatably arranged around the axis is rotated, the base presser member 14 rotates together with the operation wheel 15 to rotate the operation portion. Due to the change in the positional relationship with the flange portion 11a formed to protrude forward from the main body 11, the connection cap 5 is engaged with a portion having a large diameter of the Dalma-shaped hole formed in the cap pressing member 14. As a result, the connection cap 5 can be detached therefrom, and the flexible sheath 1 can be detached from the operation portion main body 11.

図３に戻って、操作ワイヤ３の基端には、導電金属製の連結棒４が固着されていて、進退操作部材１６に取り付けられたスライド棒１８にその連結棒４が着脱自在に連結されている。より具体的には、連結棒４に形成された括れ部４ａが、スライド棒１８に形成された係合孔１９に通されてそこに係合している。 Returning to FIG. 3, a conductive metal connecting rod 4 is fixed to the proximal end of the operation wire 3, and the connecting rod 4 is detachably connected to a slide rod 18 attached to the advance / retreat operating member 16. ing. More specifically, the constricted portion 4a formed in the connecting rod 4 is passed through the engaging hole 19 formed in the slide rod 18 and engaged therewith.

連結棒４の軸線に対して垂直の向きに進退操作部材１６に取り付けられたスライド棒１８はその軸線方向に可動であり、圧縮コイルスプリング２０で押しボタン２１側に常時付勢されていて、押しボタン２１を押し込み操作すれば圧縮コイルスプリング２０の付勢力に抗してスライド棒１８を軸線方向に移動させることができる。２２は、図示されていない高周波電源コードを接続するための接続端子であり、スライド棒１８を経由して操作ワイヤ３に高周波電流を通電することができる。 The slide rod 18 attached to the advance / retreat operation member 16 in a direction perpendicular to the axis of the connecting rod 4 is movable in the axial direction, and is always urged toward the push button 21 by the compression coil spring 20 to push If the button 21 is pushed in, the slide bar 18 can be moved in the axial direction against the urging force of the compression coil spring 20. Reference numeral 22 denotes a connection terminal for connecting a high-frequency power cord (not shown), and a high-frequency current can be applied to the operation wire 3 via the slide bar 18.

図６は連結棒４を示しており、一定の外径の丸棒状に形成された連結棒４の中間部分には外径が細い括れ部４ａが形成されており、その括れ部４ａの断面形状は正方形状に形成されている。ただし、その角部が面取りされていてもよい。 FIG. 6 shows the connecting rod 4, and a constricted portion 4a having a thin outer diameter is formed at the intermediate portion of the connecting rod 4 formed in a round bar shape having a constant outer diameter, and the cross-sectional shape of the constricted portion 4a is shown. Is formed in a square shape. However, the corner may be chamfered.

そのような連結棒４が通される係合孔１９は、図７に示されるように、広幅部１９ｗと細幅部１９ｎとが一つながりになった形状に形成されていて、細幅部１９ｎの幅Ｓは、連結棒４の括れ部４ａの正方形断面の対辺が略内接してその中で連結棒４が回転できなくなるサイズに形成され、広幅部１９ｗの幅Ｌは、連結棒４全体が緩く通過する（即ち、連結棒４の括れ部４ａの正方形断面の対角が緩く通過する）サイズに形成されている。 As shown in FIG. 7, the engagement hole 19 through which such a connecting rod 4 passes is formed in a shape in which the wide portion 19w and the narrow portion 19n are connected, and the narrow portion 19n. The width S of the constricted portion 4a of the connecting rod 4 is formed in such a size that the opposite side of the square cross section of the constricted portion 4a is substantially inscribed so that the connecting rod 4 cannot be rotated therein. It is formed in a size that passes loosely (that is, the diagonal of the square cross section of the constricted portion 4a of the connecting rod 4 passes loosely).

また、係合孔１９の広幅部１９ｗと細幅部１９ｎとの境界領域において、係合孔１９の幅方向の一方の縁部が細幅部１９ｎより広い幅に切り欠かれて、その部分において係合孔１９が非対称形状に形成されている。 In addition, in the boundary region between the wide width portion 19w and the narrow width portion 19n of the engagement hole 19, one edge portion in the width direction of the engagement hole 19 is cut out to a width wider than the narrow width portion 19n. The engagement hole 19 is formed in an asymmetric shape.

１９ｘがその切り欠き部であり、切り欠き部１９ｘは、広幅部１９ｗと細幅部１９ｎとの双方にまたがって最大幅が広幅部１９ｗと細幅部１９ｎとの間になる程度の滑らかな円弧状の輪郭に形成されている。 19x is the cut-out portion, and the cut-out portion 19x is a smooth circle having a maximum width between the wide-width portion 19w and the narrow-width portion 19n across both the wide-width portion 19w and the narrow-width portion 19n. It has an arcuate contour.

図８と図１は、進退操作部材１６に連結棒４が連結されている部分の分解斜視図と正面断面図（図３におけるＩ−Ｉ断面図）であり、図９は、図１に示される状態から押しボタン２１が押し込み操作されて圧縮コイルスプリング２０が圧縮された状態を示している。 8 and 1 are an exploded perspective view and a front sectional view (II sectional view in FIG. 3) of a portion where the connecting rod 4 is connected to the advancing / retracting operation member 16, and FIG. 9 is shown in FIG. In this state, the push button 21 is pushed and the compression coil spring 20 is compressed.

連結棒４を係合孔１９に係合させる際には、まず図９に示されるように、押しボタン２１を押し込み操作し、係合孔１９の広幅部１９ｗに連結棒４を通してその括れ部４ａが係合孔１９内に位置するようにセットする。 When engaging the connecting rod 4 with the engaging hole 19, first, as shown in FIG. 9, the push button 21 is pushed in, and the constricted portion 4 a is passed through the connecting rod 4 through the wide portion 19 w of the engaging hole 19. Is set in the engagement hole 19.

そして、押しボタン２１の押し込み操作を止めると、図１に示されるように、圧縮コイルスプリング２０の付勢力により係合孔１９が連結棒４の軸線に対し垂直方向に移動して、連結棒４の括れ部４ａが係合孔１９の細幅部１９ｎにピッタリと係合して、連結棒４がそこから離脱できない状態になり、操作ワイヤ３が進退操作部材１６によって進退操作される状態になる。 When the push-in operation of the push button 21 is stopped, the engagement hole 19 moves in the direction perpendicular to the axis of the connecting rod 4 by the urging force of the compression coil spring 20 as shown in FIG. The constricted portion 4a is perfectly engaged with the narrow width portion 19n of the engaging hole 19, so that the connecting rod 4 cannot be detached therefrom, and the operation wire 3 is moved forward and backward by the forward / backward operation member 16. .

そして、断面形状が正方形状に形成された括れ部４ａは係合孔１９に対して回転することができないので、操作部全体を操作ワイヤ３の軸線周りに回転させれば、それに追従して操作ワイヤ３が軸線周り方向に確実に回転するので、操作ワイヤ３の先端に連結された先端処置部材２を回転させて、患部を速やかに狙撃することができる。 Since the constricted portion 4a having a square cross-sectional shape cannot be rotated with respect to the engagement hole 19, if the entire operation portion is rotated around the axis of the operation wire 3, the operation is performed following that. Since the wire 3 reliably rotates in the direction around the axis, the distal treatment member 2 coupled to the distal end of the operation wire 3 can be rotated to quickly snip the affected area.

また、図９に示されるように、圧縮コイルスプリング２０の付勢力に抗して押しボタン２１を押し込んで、係合孔１９の広幅部１９ｗに連結棒４の括れ部４ａを係合させると、連結棒４をそこから離脱させることができる（即ち、操作ワイヤ３を進退操作部材１６から取り外せる）状態になる。 Further, as shown in FIG. 9, when the push button 21 is pushed against the urging force of the compression coil spring 20 to engage the constricted portion 4 a of the connecting rod 4 with the wide portion 19 w of the engagement hole 19, The connecting rod 4 can be detached therefrom (that is, the operation wire 3 can be detached from the advance / retreat operation member 16).

そのような機構において、仮に図１１に示されるように、係合孔１９が広幅部１９ｗと細幅部１９ｎだけを一つながりに形成した対称形状になっていると、図１２に順に示されるように、連結棒４が係合孔１９の広幅部１９ｗに通された後（Ａ）、細幅部１９ｎの方に移動していくと（Ｂ）、連結棒４の括れ部４ａの対角部分が細幅部１９ｎの入口部分に引っ掛かって連結棒４が細幅部１９ｎに係合せず（Ｃ）、それに気づかないで進退操作部材１６を操作すると作動不良や操作ワイヤ３の破損を招く場合がある。 In such a mechanism, as shown in FIG. 11, if the engagement hole 19 has a symmetrical shape in which only the wide width portion 19w and the narrow width portion 19n are formed in a single line, as shown in FIG. When the connecting rod 4 passes through the wide portion 19w of the engagement hole 19 (A) and then moves toward the narrow portion 19n (B), the diagonal portion of the constricted portion 4a of the connecting rod 4 is obtained. Is caught at the inlet portion of the narrow portion 19n and the connecting rod 4 does not engage with the narrow portion 19n (C), and operating the advancing / retreating operation member 16 without noticing it may cause malfunction or damage to the operation wire 3. is there.

それに対して本実施例では、係合孔１９の広幅部１９ｗと細幅部１９ｎとの境界領域に係合孔１９が非対称形になる切り欠き部１９ｘが形成されていることにより、図１０に順に示されるように、連結棒４が係合孔１９の広幅部１９ｗに通された後（Ａ、Ｂ）、連結棒４の括れ部４ａの対角部分が細幅部１９ｎの入口部分に差しかかって引っ掛かりそうになっても（Ｃ）、連結棒４が軸線周りに回転して（Ｄ）、括れ部４ａが必ず細幅部１９ｎにピッタリと係合する状態になり（Ｅ）、操作部に対する操作ワイヤ３の基端の取り付けを容易かつ確実に行うことができる。 On the other hand, in the present embodiment, a notch portion 19x in which the engagement hole 19 is asymmetrical is formed in the boundary region between the wide width portion 19w and the narrow width portion 19n of the engagement hole 19, so that FIG. As shown in order, after the connecting rod 4 is passed through the wide portion 19w of the engagement hole 19 (A, B), the diagonal portion of the constricted portion 4a of the connecting rod 4 is inserted into the inlet portion of the narrow portion 19n. Even if it is likely to be caught (C), the connecting rod 4 rotates around the axis (D), and the constricted portion 4a is surely engaged with the narrow portion 19n (E), and the operation portion The operation wire 3 can be attached to the base end easily and reliably.

なお、本発明は上記実施例に限定されるものではなく、例えば連結棒４の括れ部４ａの断面形状を、あい対向する２辺が係合孔１９の細幅部１９ｎに略内接する大きさの多角形状に形成すれば、操作部を回転させることにより、操作ワイヤ３が軸線周り方向に確実に回転するようにすることができる。 The present invention is not limited to the above-described embodiment. For example, the cross-sectional shape of the constricted portion 4a of the connecting rod 4 is such that two opposing sides are substantially inscribed in the narrow width portion 19n of the engagement hole 19. By forming the polygonal shape, the operation wire 3 can be reliably rotated in the direction around the axis by rotating the operation portion.

本発明の実施例の内視鏡用処置具の操作部の正面断面図（図３におけるＩ−Ｉ断面図）である。It is front sectional drawing (II sectional drawing in FIG. 3) of the operation part of the treatment tool for endoscopes of the Example of this invention. 本発明の実施例の内視鏡用処置具の全体構成を示す斜視図である。It is a perspective view which shows the whole structure of the treatment tool for endoscopes of the Example of this invention. 本発明の実施例の内視鏡用処置具の操作部の側面断面図である。It is side surface sectional drawing of the operation part of the treatment tool for endoscopes of the Example of this invention. 本発明の実施例の内視鏡用処置具の操作部の平面断面図である。It is plane sectional drawing of the operation part of the treatment tool for endoscopes of the Example of this invention. 本発明の実施例の図４におけるＶ−Ｖ断面図である。It is VV sectional drawing in FIG. 4 of the Example of this invention. 本発明の実施例の連結棒の斜視図である。It is a perspective view of the connecting rod of the Example of this invention. 本発明の実施例の係合孔の正面断面図である。It is front sectional drawing of the engagement hole of the Example of this invention. 本発明の実施例の内視鏡用処置具の操作部の部分分解斜視図である。It is a partial exploded perspective view of the operation part of the treatment tool for endoscopes of the example of the present invention. 本発明の実施例の内視鏡用処置具の操作部の押しボタンが押された状態の正面断面図である。It is front sectional drawing of the state by which the push button of the operation part of the treatment tool for endoscopes of the Example of this invention was pushed. 本発明の実施例の内視鏡用処置具の操作部に対する連結棒取り付け時の動作を順に示す正面断面図である。It is front sectional drawing which shows in order the operation | movement at the time of connecting rod attachment with respect to the operation part of the treatment tool for endoscopes of the Example of this invention. 本発明の参考例の係合孔の正面断面図である。It is front sectional drawing of the engagement hole of the reference example of this invention. 本発明の参考例の内視鏡用処置具の操作部に対する連結棒取り付け時の動作を順に示す正面断面図である。It is front sectional drawing which shows the operation | movement at the time of connecting rod attachment with respect to the operation part of the treatment tool for endoscopes of the reference example of this invention in order.

符号の説明Explanation of symbols

１可撓性シース
３操作ワイヤ
４連結棒
４ａ括れ部
１１操作部本体
１６進退操作部材
１８スライド棒
１９係合孔
１９ｎ細幅部
１９ｗ広幅部
１９ｘ切り欠き部
２０圧縮コイルスプリング
２１押しボタン DESCRIPTION OF SYMBOLS 1 Flexible sheath 3 Operation wire 4 Connecting rod 4a Constriction part 11 Operation part main body 16 Advance / retreat operation member 18 Slide bar 19 Engagement hole 19n Narrow part 19w Wide part 19x Notch part 20 Compression coil spring 21 Push button

Claims

シース内に軸線方向に進退自在に挿通された操作ワイヤの基端が上記シースの基端から引き出されて、その操作ワイヤの基端部に取り付けられた連結棒が上記操作ワイヤを軸線方向に進退操作するための進退操作部材に設けられた係合孔に通され、広幅部と細幅部とを有する上記係合孔を上記連結棒の軸線に対し垂直方向に移動させて上記係合孔の細幅部を上記連結棒に形成された括れ部に係合させることにより、上記連結棒が上記進退操作部材と一体的に移動する状態になるように構成された内視鏡用処置具の操作部において、
上記連結棒の括れ部の断面形状を、あい対向する２辺が上記係合孔の細幅部に略内接する大きさの正方形状に形成し、
上記係合孔の広幅部が上記連結棒の括れ部の断面形状の対角寸法より大きな幅に形成されると共に、上記係合孔の広幅部と細幅部との境界領域において上記係合孔の一方の縁部が上記細幅部より広い幅に切り欠かれて、その部分において上記係合孔が非対称形状に形成されたことを特徴とする内視鏡用処置具の操作部。 The proximal end of the operating wire inserted into the sheath so as to be movable back and forth in the axial direction is pulled out from the proximal end of the sheath, and a connecting rod attached to the proximal end of the operating wire advances and retracts the operating wire in the axial direction. The engagement hole provided in the advance / retreat operation member for operation is moved in the direction perpendicular to the axis of the connecting rod by moving the engagement hole having the wide portion and the narrow portion. Operation of an endoscope treatment instrument configured such that the connecting rod moves integrally with the advance / retreat operation member by engaging the narrow portion with a constricted portion formed on the connecting rod. In the department,
The cross-sectional shape of the constricted portion of the connecting rod, opposing two sides is formed in a square shape of substantially the contact size in the narrow portion of the engaging hole,
The wide portion of the engagement hole is formed to have a width larger than the diagonal dimension of the cross-sectional shape of the constricted portion of the connecting rod, and the engagement hole is formed in a boundary region between the wide portion and the narrow portion of the engagement hole. One end portion of the endoscope is cut out to a width wider than the narrow width portion, and the engagement hole is formed in an asymmetric shape in the cut portion.