JP5552014B2

JP5552014B2 - Endoscope suction button

Info

Publication number: JP5552014B2
Application number: JP2010219441A
Authority: JP
Inventors: 健二山根
Original assignee: Fujifilm Corp
Current assignee: Fujifilm Corp
Priority date: 2010-09-29
Filing date: 2010-09-29
Publication date: 2014-07-16
Anticipated expiration: 2030-09-29
Also published as: CN102697445B; JP2012071023A; CN102697445A

Description

本発明は、内視鏡挿入部の先端に開口した吸引口からの体液等の吸引を制御する内視鏡の吸引ボタンに関する。 The present invention relates to an endoscope suction button for controlling suction of body fluid or the like from a suction port opened at a distal end of an endoscope insertion portion.

一般に内視鏡の挿入部内には、その先端面の吸引口に通じる吸引通路が設けられている。この吸引通路は操作部に設けられた吸引ボタンに接続している。このような吸引通路としては、鉗子等の処置具の挿通や洗浄水などの噴射に使用される鉗子チャネルがよく利用されており、この鉗子チャネルの途中から分岐した吸引通路が吸引ボタンに接続している。 Generally, a suction passage that leads to a suction port on the distal end surface is provided in the insertion portion of the endoscope. This suction passage is connected to a suction button provided in the operation unit. As such a suction passage, a forceps channel used for insertion of a treatment tool such as forceps or jetting of washing water is often used, and a suction passage branched from the middle of the forceps channel is connected to a suction button. ing.

吸引ボタンには、吸引通路の他に、吸引ポンプ等の負圧源に通じる負圧源通路が接続している。吸引ボタンは、術者の押圧操作により吸引通路と負圧源通路とを連通して吸引口から吸引を行わせ、この押圧操作が解除されたときに吸引通路と負圧源通路との連通を遮断して吸引口からの吸引を停止させる（特許文献１ないし５参照）。 In addition to the suction passage, a negative pressure source passage leading to a negative pressure source such as a suction pump is connected to the suction button. The suction button causes the suction passage and the negative pressure source passage to communicate with each other by the operator's pressing operation, and suction is performed from the suction port. When the pressing operation is released, the suction passage and the negative pressure source passage are communicated. It shuts off and the suction from a suction port is stopped (refer patent documents 1 thru | or 5).

このような吸引ボタンには、図１５（Ａ），（Ｂ）に示すように、内視鏡の操作部に設けられ、先端が操作部外で開口し後端が吸引通路１００に接続したシリンダ１０１と、シリンダ１０１の管路１０２に移動自在に収容されたプランジャ１０３と、シリンダ１０１及びプランジャ１０３を連結するキャップ１０４とで構成されているものがよく知られている。 As shown in FIGS. 15A and 15B, such a suction button is a cylinder provided at the operation portion of the endoscope, having a distal end opened outside the operation portion and a rear end connected to the suction passage 100. It is well known that it is composed of 101, a plunger 103 movably accommodated in a pipe line 102 of the cylinder 101, and a cap 104 connecting the cylinder 101 and the plunger 103.

シリンダ１０１は、弾性を有する樹脂材料で形成されており、その管路１０２内には略錐形状の管路を有する弁受け部１０５が設けられている。また、管路１０２内のシリンダ開口１０６と弁受け部１０５との間には、負圧源通路１０７に通じる接続口１０８が開口している。 The cylinder 101 is formed of a resin material having elasticity, and a valve receiving portion 105 having a substantially conical pipe line is provided in the pipe line 102. In addition, a connection port 108 communicating with the negative pressure source passage 107 is opened between the cylinder opening 106 in the conduit 102 and the valve receiving portion 105.

プランジャ１０３は、シリンダ開口１０６から突出した先端部１１０ａを有する本体軸部１１０と、本体軸部１１０の後端部に設けられ、弁受け部１０５の管路の内壁に沿う略錐形状の弁部１１１とが一体形成されてなる。このプランジャ１０３は、シリンダ開口１０６側から管路１０２内へ弁部１１１及び後端部を挿入することにより、シリンダ１０１に組み込まれる。このとき、弁部１１１の最大径は弁受け部１０５の管路の最小径より大きいので、弁部１１１が弁受け部１０５を通過するときに、本体軸部１１０をシリンダ開口１０６内に押し込む力を一時的に強める。これにより、弁受け部１０５の管路が弾性変形して拡径することで弁部１１１の通過が可能となり、この弁部１１１の通過後に弁受け部１０５が元の形状に復元することで、プランジャ１０３の組み込み作業が完了する。 The plunger 103 is provided at a main body shaft portion 110 having a front end portion 110 a protruding from the cylinder opening 106, and a rear end portion of the main body shaft portion 110, and has a substantially cone-shaped valve portion along the inner wall of the valve receiving portion 105. 111 is integrally formed. The plunger 103 is incorporated into the cylinder 101 by inserting the valve portion 111 and the rear end portion into the pipe line 102 from the cylinder opening 106 side. At this time, since the maximum diameter of the valve portion 111 is larger than the minimum diameter of the conduit of the valve receiving portion 105, the force that pushes the main body shaft portion 110 into the cylinder opening 106 when the valve portion 111 passes through the valve receiving portion 105. Temporarily strengthen. Thereby, the passage of the valve portion 111 becomes possible by elastically deforming and expanding the diameter of the conduit of the valve receiving portion 105, and the valve receiving portion 105 is restored to its original shape after passing through the valve portion 111. The assembly operation of the plunger 103 is completed.

キャップ１０４は、ゴム等の弾性材料で形成されており、先端部１１０ａの先端とシリンダ１０１の先端とを連結して、この先端部１１０ａをシリンダ開口１０６から突出する方向に常時付勢する。また、キャップ１０４の側面には、大気に通じる通気穴１１２が開口している。 The cap 104 is formed of an elastic material such as rubber, and connects the tip of the tip portion 110 a and the tip of the cylinder 101, and constantly urges the tip portion 110 a in a direction protruding from the cylinder opening 106. Further, a vent hole 112 communicating with the atmosphere is opened on the side surface of the cap 104.

上記構成の吸引ボタンでは、図１５（Ａ）に示すように先端部１１０ａが押圧操作されていない場合、弁部１１１が弁受け部１０５に当接することで吸引通路１００と負圧源通路１０７との連通が遮断される。このとき負圧源通路１０７は、プランジャ１０３と管路１０２との隙間、シリンダ開口１０６、及び通気穴１１２などを介して大気と連通する。これは吸引ポンプが常時作動しているので、負圧源通路１０７が大気と連通しないと、吸引ポンプのポンプ圧が増加しこれに伴い吸引ポンプに掛かる負荷が増加するためである。このため、負圧源通路１０７を大気と連通させることで吸引ポンプの負荷の増加が抑えられる。 In the suction button having the above-described configuration, when the distal end portion 110 a is not pressed as shown in FIG. 15A, the suction passage 100 and the negative pressure source passage 107 are brought into contact with the valve receiving portion 105. Is disconnected. At this time, the negative pressure source passage 107 communicates with the atmosphere via the gap between the plunger 103 and the pipe passage 102, the cylinder opening 106, the vent hole 112, and the like. This is because, since the suction pump is always operating, if the negative pressure source passage 107 does not communicate with the atmosphere, the pump pressure of the suction pump increases, and the load applied to the suction pump increases accordingly. For this reason, the increase in the load of the suction pump can be suppressed by connecting the negative pressure source passage 107 to the atmosphere.

一方、図１５（Ｂ）に示すように、押圧操作により先端部１１０ａがシリンダ開口１０６内に所定量だけ押し込まれると、弁部１１１が弁受け部１０５から離れることにより、吸引通路１００と負圧源通路１０７とが連通する。また、これと同時に、先端部１１０ａに嵌着されたＯリング１１３がシリンダ開口１０６に圧接されてシリンダ開口１０６を塞ぐことにより、負圧源通路１０７と大気との連通が遮断される。これにより、吸引ポンプの吸引によって負圧源通路１０７に通じる各管路内の負圧吸引力が増加して、吸引口からの吸引が開始される。 On the other hand, as shown in FIG. 15B, when the tip portion 110a is pushed into the cylinder opening 106 by a predetermined amount by the pressing operation, the valve portion 111 is separated from the valve receiving portion 105, thereby causing the suction passage 100 and the negative pressure. The source passage 107 communicates. At the same time, the O-ring 113 fitted to the distal end portion 110a is pressed against the cylinder opening 106 to close the cylinder opening 106, thereby blocking communication between the negative pressure source passage 107 and the atmosphere. Thereby, the negative pressure suction force in each pipe line leading to the negative pressure source passage 107 is increased by the suction of the suction pump, and suction from the suction port is started.

特開２００７−１８５２７６号公報JP 2007-185276 A 特開平５−１６１５９９号公報JP-A-5-161599 特開平６−０７０８８０号公報JP-A-6-070880 特開平１１−３１８９０８号公報JP-A-11-318908 特開昭６２−１８９０４１号公報JP-A-62-189041

上記構成の吸引ボタンでは、先端部１１０ａが押圧操作されていない吸引ＯＦＦ時に、弁部１１１を弁受け部１０５に当接させることで吸引通路１００と負圧源通路１０７との連通を遮断している。この際に、弁部１１１の大きさが小さいと、弁受け部１０５の形状の誤差や、プランジャ１０３のがたつきなどが発生したときに、上記遮断が不十分となり、吸引口から吸引された吸引物が管路１０２内に漏れるおそれがある。このため、弁部１１１を大きくすることが好ましい。しかしながら、弁部１１１を大きくすると、プランジャ１０３をシリンダ１０１に組み込む際に、この弁部１１１が弁受け部１０５の管路内を通過できなくなり、組み込みを行えないおそれが生じる。 In the suction button having the above configuration, when the tip portion 110a is not being pressed and operated, the valve portion 111 is brought into contact with the valve receiving portion 105 to block communication between the suction passage 100 and the negative pressure source passage 107. Yes. At this time, if the size of the valve portion 111 is small, when the error of the shape of the valve receiving portion 105 or the rattling of the plunger 103 occurs, the above-described blocking becomes insufficient and the valve portion 111 is sucked from the suction port. There is a possibility that the sucked material leaks into the pipe line 102. For this reason, it is preferable to enlarge the valve part 111. However, if the valve portion 111 is enlarged, when the plunger 103 is assembled into the cylinder 101, the valve portion 111 cannot pass through the pipe passage of the valve receiving portion 105, and there is a possibility that the assembly cannot be performed.

本発明は上記課題を解決するためになされたものであり、大径の弁部を有しかつシリンダに容易に組み込み可能なプランジャを備える内視鏡の吸引ボタンを提供することを目的とする。 The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an endoscope suction button including a plunger having a large-diameter valve portion and easily incorporated into a cylinder.

上記目的を達成するため、本発明は、内視鏡の操作部に設けられるとともに、内視鏡挿入部の先端に開口した吸引口に通じる吸引通路と、負圧源に接続した負圧源通路とが接続されており、前記負圧源通路と前記吸引通路との連通／遮断を切り替える内視鏡の吸引ボタンにおいて、前記操作部に設けられたシリンダであって、その一端が前記吸引通路に通じる第１シリンダ開口で開放され、その他端が前記操作部外に通じる第２シリンダ開口で開放されるとともに、シリンダ管路内に前記負圧源通路に通じる接続口が開口しているシリンダと、前記第１シリンダ開口から前記シリンダ管路内に挿入された第１先端部を有する本体軸部、及び前記本体軸部の第１後端部に設けられた弁部を有する弁機構部と、前記第２シリンダ開口から少なくとも一部が突出しており、前記弁機構部と同軸に延びた押圧操作部であって、前記第１先端部と連結する第２後端部、及び押圧操作を受ける第２先端部を有する押圧操作部とからなり、前記押圧操作部の非押圧操作時には前記弁部により前記負圧源通路と前記吸引通路との連通を遮断する遮断状態になり、前記押圧操作部の押圧操作時には前記弁部による遮断を解除して前記負圧源通路と前記吸引通路とを連通する連通状態になる連結プランジャとを備え、前記シリンダ管路の前記接続口よりも前記第１シリンダ開口側の部分には、前記他端側から前記一端側に向かうに従い次第に径が狭くなる錐形管路が含まれているととともに、前記弁部は、前記錐形管路の径よりも大きい径でかつ前記錐形管路の内壁に沿う略錐形状を有しており、前記遮断状態時には前記錐形管路の内壁に当接するとともに、前記連通状態時には前記錐形管路の内壁から離れることを特徴とする。 In order to achieve the above object, the present invention provides a suction passage that is provided in an operation portion of an endoscope, communicates with a suction opening that opens at the distal end of the endoscope insertion portion, and a negative pressure source passage that is connected to a negative pressure source Are connected to the negative pressure source passage and the suction passage, and the suction button of the endoscope is a cylinder provided in the operation portion, one end of which is connected to the suction passage. A cylinder that is opened at a first cylinder opening that communicates with the other end and is opened at a second cylinder opening that communicates with the outside of the operation portion, and a connection port that opens to the negative pressure source passage in a cylinder pipe; A main body shaft portion having a first tip portion inserted into the cylinder conduit from the first cylinder opening, and a valve mechanism portion having a valve portion provided at a first rear end portion of the main body shaft portion; At least from the second cylinder opening A pressing operation part having a protruding part, a pressing operation part extending coaxially with the valve mechanism part, having a second rear end part connected to the first tip part and a second tip part receiving the pressing operation Ri Do from the parts, said during non pressing operation of pressing the operation portion becomes cut-off state in which the communication between the suction passage and the negative pressure source passage by the valve unit, wherein at the time of depressing operation portions pressing operation of the valve portion A connection plunger that releases the shut-off and communicates the negative pressure source passage and the suction passage, and a portion closer to the first cylinder opening than the connection port of the cylinder pipe A conical pipe line whose diameter gradually decreases from the other end side toward the one end side is included, and the valve portion has a diameter larger than the diameter of the conical pipe line and the conical pipe. A substantially conical shape along the inner wall of the road, Together during state abuts the inner wall of the pyramidal shaped conduit, wherein at the time of communication with, characterized in that away from the inner wall of the pyramidal shaped conduit.

前記第１先端部の先端に形成され、その軸方向前方に長く延びた爪部と、前記第２後端部に形成され、前記爪部が係合する爪係合穴と、を備えることが好ましい。 A claw portion that is formed at the tip of the first tip portion and extends long in the axial direction, and a claw engagement hole that is formed at the second rear end portion and engages with the claw portion. preferable.

前記第２後端部は、前記連結プランジャが前記遮断状態のときに前記第２シリンダ開口上に位置するとともに、前記第２先端部の先端と前記シリンダの前記一端とにそれぞれ連結され、前記押圧操作部の外周を囲むキャップであって、その側面に大気に連通する通気穴が開口しているキャップと、前記第２後端部の側面に形成され、前記爪係合穴に係合した前記爪部の先端を露出させる開口窓と、前記開口窓が前記通気穴に略対向するように、前記連結プランジャと前記キャップとの間の回転を規制する回転規制手段とを備えることが好ましい。 The second rear end portion is positioned on the second cylinder opening when the connecting plunger is in the shut-off state, and is connected to the tip of the second tip portion and the one end of the cylinder, respectively. A cap that surrounds the outer periphery of the operating portion, wherein the side surface of the cap has a vent hole communicating with the atmosphere; and the side surface of the second rear end portion is engaged with the claw engaging hole. It is preferable to include an opening window that exposes the tip of the claw portion, and a rotation restricting means that restricts rotation between the coupling plunger and the cap so that the opening window substantially faces the vent hole.

前記負圧源通路は、前記連結プランジャが前記遮断状態のときに、前記接続口、前記シリンダ管路、前記第２シリンダ開口、及び前記通気穴を介して大気と連通することが好ましい。また、前記キャップは、弾性材料で形成されており、前記連結プランジャを前記遮断状態で維持することが好ましい。 The negative pressure source passage preferably communicates with the atmosphere through the connection port, the cylinder conduit, the second cylinder opening, and the vent hole when the connecting plunger is in the shut-off state. The cap is preferably made of an elastic material, and the connecting plunger is preferably maintained in the shut-off state.

前記爪部は、前記押圧操作部の軸方向長さ以上の長さを有する一対の爪部であり、前記爪係合穴は、前記押圧操作部にその軸方向に貫通するように形成されるとともに、前記第２先端部の先端面に開口した一対の開口を有し、前記一対の開口の縁に前記一対の爪部の先端がそれぞれ引っ掛けられていることが好ましい。 The claw portions are a pair of claw portions having a length equal to or longer than the axial length of the pressing operation portion, and the claw engaging holes are formed to penetrate the pressing operation portion in the axial direction. In addition, it is preferable that a pair of openings opened on the distal end surface of the second distal end portion, and the distal ends of the pair of claws are respectively hooked on edges of the pair of openings.

前記一対の爪部の先端は、前記一対の開口の互いに隣接する側の開口縁とは反対側の開口縁に引っ掛けられており、前記一対の開口から突出している前記一対の爪部の先端がつまみ操作されたときに、前記一対の爪部と前記爪係合穴との係合が解除されることが好ましい。 The tips of the pair of claws are hooked on the opening edges of the pair of openings opposite to the opening edges on the sides adjacent to each other, and the tips of the pair of claws protruding from the pair of openings are When the knob is operated, the engagement between the pair of claw portions and the claw engagement holes is preferably released.

また、前記負圧源は吸引ポンプであることが好ましい。 Also, it is preferable that the negative pressure source is a suction pump.

本発明の内視鏡の吸引ボタンは、シリンダ管路の接続口よりも第１シリンダ開口側の部分に錐形管路を有し、錐形管路の径よりも大きい径でかつ錐形管路の内壁に沿う略錐形状に弁部を形成しており、第１シリンダ開口からシリンダ管路内に挿入された弁機構部を、第２シリンダ開口側に設けられた押圧操作部と連結することによって、連結プランジャをシリンダに組み込んでいるので、この組み込み時にシリンダ管路内に弁部を通す必要が無くなる。その結果、弁部の大きさをシリンダ管路の内径よりも十分に大きくした場合でもプランジャの組み込みを容易に行うことができる。また、弁機構部と押圧操作部との連結を解除することにより、両者を分離して洗浄消毒処理を施すことができる。さらに、洗浄消毒処理後の連結プランジャの組み込みをユーザが容易に実行することができる。
The suction button of the endoscope of the present invention has a cone-shaped pipe in a portion closer to the first cylinder opening than the connection port of the cylinder pipe, and has a diameter larger than the diameter of the cone-shaped pipe and the cone-shaped pipe. The valve portion is formed in a substantially conical shape along the inner wall of the passage, and the valve mechanism portion inserted into the cylinder conduit from the first cylinder opening is connected to a pressing operation portion provided on the second cylinder opening side. As a result, since the connecting plunger is incorporated in the cylinder, it is not necessary to pass the valve portion through the cylinder pipe during this incorporation. As a result, the plunger can be easily assembled even when the size of the valve portion is sufficiently larger than the inner diameter of the cylinder pipe. Further, by releasing the connection between the valve mechanism portion and the pressing operation portion, the both can be separated and subjected to the cleaning / disinfecting process. Furthermore, the user can easily perform the incorporation of the connecting plunger after the cleaning / disinfecting process.

内視鏡の吸引機構の概略図である。It is the schematic of the suction mechanism of an endoscope. 吸引ＯＦＦ時の吸引ボタンの断面図である。It is sectional drawing of the suction button at the time of suction OFF. 吸引ＯＮ時の吸引ボタンの断面図である。It is sectional drawing of the suction button at the time of attraction | suction ON. 弁ガイド部材の斜視図である。It is a perspective view of a valve guide member. （Ａ），（Ｂ）ともに連結プランジャの斜視図である。(A), (B) is a perspective view of a connection plunger. （Ａ）はキャップの斜視図であり、（Ｂ）はキャップの断面図である。(A) is a perspective view of a cap, (B) is sectional drawing of a cap. 連結プランジャの組み込み手順を説明するための説明である。It is description for demonstrating the integration procedure of a connection plunger. 連結プランジャの連結部分を目視で確認可能した構成を説明するための説明図である。It is explanatory drawing for demonstrating the structure which can confirm the connection part of the connection plunger visually. 吸引ＯＦＦ時の吸引ボタンの断面を拡大した拡大図である。It is the enlarged view to which the cross section of the suction button at the time of suction OFF was expanded. 吸引ＯＮ時の吸引ボタンの断面を拡大した拡大図である。It is the enlarged view to which the cross section of the suction button at the time of suction ON was expanded. 第２実施形態の吸引ボタンの断面図であり、吸引ＯＦＦ時の状態を示すものである。It is sectional drawing of the attraction | suction button of 2nd Embodiment, and shows the state at the time of attraction | suction OFF. 第２実施形態の吸引ボタンの断面図であり、吸引ＯＮ時の状態を示すものである。It is sectional drawing of the attraction | suction button of 2nd Embodiment, and shows the state at the time of attraction | suction ON. （Ａ），（Ｂ）ともに第２実施形態のプランジャの斜視図である。(A), (B) is a perspective view of the plunger of 2nd Embodiment. （Ａ），（Ｂ）は第２実施形態の連結プランジャの分解手順を説明するための説明図である。(A), (B) is explanatory drawing for demonstrating the decomposition | disassembly procedure of the connection plunger of 2nd Embodiment. 従来の吸引ボタンの断面図であり、（Ａ）が吸引ＯＦＦ時、（Ｂ）が吸引ＯＮ時を示している。It is sectional drawing of the conventional suction button, (A) has shown at the time of attraction | suction OFF, (B) has shown at the time of attraction | suction ON.

［第１実施形態］
図１に示すように、内視鏡１０は、例えば気管に挿入する気管支鏡であり、気管内に挿入される挿入部１１と、挿入部１１の後端部分に連設された操作部１２と、図示しないプロセッサ装置や光源装置などに接続されるユニバーサルコード１３とを備えている。 [First Embodiment]
As shown in FIG. 1, an endoscope 10 is a bronchoscope that is inserted into a trachea, for example, and includes an insertion portion 11 that is inserted into the trachea, and an operation portion 12 that is connected to a rear end portion of the insertion portion 11. And a universal cord 13 connected to a processor device and a light source device (not shown).

挿入部１１には、鉗子等の処置具を挿入するための鉗子チャネル１４が設けられている。この鉗子チャネル１４の一端は、挿入部１１の先端面に設けられた吸引／鉗子口（以下、単に吸引口という）１５に接続し、他端は操作部１２に設けられた鉗子入口１６に接続している。この鉗子入口１６は、処置具を挿入するとき以外は鉗子栓（図示せず）により閉塞されている。なお、鉗子入口１６にシリンジ（図示せず）を接続し、このシリンジから生理食塩水等の洗浄水を注入した場合には、この洗浄水は鉗子チャネル１４を通って吸引口１５から噴出する。 The insertion part 11 is provided with a forceps channel 14 for inserting a treatment tool such as forceps. One end of the forceps channel 14 is connected to a suction / forceps port (hereinafter simply referred to as a suction port) 15 provided on the distal end surface of the insertion portion 11, and the other end is connected to a forceps inlet 16 provided in the operation portion 12. doing. The forceps inlet 16 is closed by a forceps plug (not shown) except when the treatment tool is inserted. When a syringe (not shown) is connected to the forceps inlet 16 and cleaning water such as physiological saline is injected from the syringe, the cleaning water is ejected from the suction port 15 through the forceps channel 14.

また、挿入部の先端には、吸引口１５の他に、観察窓や照明窓（図示せず）が設けられている。観察窓の奥には固体撮像素子（図示せず）などが取り付けられている。照明窓の奥には光ファイバケーブル（図示せず）が配置されている。固体撮像素子の信号線や光ファイバケーブルは、挿入部１１やユニーバルコード１３などを経て、上述のプロセッサ装置、光源装置にそれぞれ接続される。 In addition to the suction port 15, an observation window and an illumination window (not shown) are provided at the distal end of the insertion portion. A solid-state image sensor (not shown) or the like is attached to the back of the observation window. An optical fiber cable (not shown) is disposed behind the illumination window. A signal line and an optical fiber cable of the solid-state imaging device are connected to the above-described processor device and light source device via the insertion portion 11 and the universal cord 13, respectively.

鉗子チャネル１４は、吸引口１５から血液等の体液や体内汚物等の固形物などを吸引するための経路として用いられる。操作部１２内には、鉗子チャネル１４から分岐した吸引通路１７が設けられている。この吸引通路１７は、操作部１２に設けられた吸引ボタン１８に接続している。 The forceps channel 14 is used as a path for sucking a body fluid such as blood or a solid matter such as filth from the suction port 15. A suction passage 17 branched from the forceps channel 14 is provided in the operation unit 12. The suction passage 17 is connected to a suction button 18 provided in the operation unit 12.

吸引ボタン１８は、吸引通路１７の他に操作部１２外において、吸引ポンプ（負圧源）２０に通じる負圧源通路２１に接続している。吸引ボタン１８は、押圧操作またはその押圧操作の解除により、吸引通路１７と負圧源通路２１との連通／遮断を切り替える。吸引ポンプ２０は、内視鏡検査中は吸引を常時行う。 In addition to the suction passage 17, the suction button 18 is connected to a negative pressure source passage 21 that communicates with a suction pump (negative pressure source) 20 outside the operation unit 12. The suction button 18 switches communication / blocking between the suction passage 17 and the negative pressure source passage 21 by a pressing operation or release of the pressing operation. The suction pump 20 always performs suction during the endoscopic examination.

吸引ＯＦＦ時の状態を示す図２、及び吸引ＯＮ時の状態を示す図３において、吸引ボタン１８は、大別して操作部１２に固定された弁ガイド部材（シリンダ）２４と、この弁ガイド部材２４内に収容されたプランジャ２５と、弁ガイド部材２４及びプランジャ２５を連結するキャップ２６とで構成される。なお、以下の説明では、図中上方側を先端側、図中下方側を後端側という。 In FIG. 2 showing the state when the suction is turned off and FIG. 3 showing the state when the suction is turned on, the suction button 18 is roughly divided into a valve guide member (cylinder) 24 fixed to the operation unit 12, and the valve guide member 24. The plunger 25 accommodated in the inside and the valve guide member 24 and the cap 26 which connects the plunger 25 are comprised. In the following description, the upper side in the figure is referred to as the front end side, and the lower side in the figure is referred to as the rear end side.

操作部１２の筐体２８には略管状の弁ケーシング２７が固定されており、弁ガイド部材２４を操作部１２に連結する。弁ケーシング２７は、その先端部が筐体２８の外側に突出し、その後端部が筐体２８の内側に突出した状態で筐体２８に固定されている。弁ケーシング２７内には、その軸方向に長く延びた管路３１が形成されている。弁ケーシング２７の後端部には、吸引通路１７に接続する吸引接続口３２が設けられており、この吸引接続口３２を介して管路３１と吸引通路１７とが連通する。また、管路３１の先端側の開口には弁ガイド部材２４が連結される。 A substantially tubular valve casing 27 is fixed to the casing 28 of the operation unit 12, and connects the valve guide member 24 to the operation unit 12. The valve casing 27 is fixed to the casing 28 with its leading end protruding outside the casing 28 and its rear end protruding inside the casing 28. A pipe line 31 extending in the axial direction is formed in the valve casing 27. A suction connection port 32 connected to the suction passage 17 is provided at the rear end portion of the valve casing 27, and the pipe line 31 and the suction passage 17 communicate with each other through the suction connection port 32. A valve guide member 24 is connected to the opening on the distal end side of the conduit 31.

弁ガイド部材２４は、その後端部が弁ケーシング２７の先端側の開口に嵌合して連結されており、管路３１と同心の管路を有している。弁ガイド部材２４の先端部には、連結プランジャ２５の先端部を突出させるための先端側シリンダ開口（第２シリンダ開口）３５が開口している。 The valve guide member 24 has a rear end portion fitted and connected to an opening on the distal end side of the valve casing 27, and has a conduit concentric with the conduit 31. A distal end side cylinder opening (second cylinder opening) 35 for projecting the distal end portion of the coupling plunger 25 is opened at the distal end portion of the valve guide member 24.

図４に示すように、シリンダ先端の端面（以下、シリンダ端面という）２４ａ上でかつ先端側シリンダ開口３５の周縁部には、キャップ２６と連結する円筒部３７が設けられている。この円筒部３７の先端の外周面にはフランジ３８が形成されている。フランジ３８には、その一部を平面状に切り欠かくことにより、キャップ２６との回転止めに用いられるキャップ回転止め面３８ａが形成されている。また、フランジ３８の底面と、円筒部３７の外周面と、シリンダ端面２４ａとにより、キャップ２６が連結する略環状のシリンダ用キャップ取付溝３９（図２及び図３参照）が形成されている。 As shown in FIG. 4, a cylindrical portion 37 that is connected to the cap 26 is provided on an end surface (hereinafter referred to as a cylinder end surface) 24 a at the front end of the cylinder and on a peripheral portion of the front end side cylinder opening 35. A flange 38 is formed on the outer peripheral surface of the tip of the cylindrical portion 37. The flange 38 is formed with a cap rotation stop surface 38a used for stopping rotation with the cap 26 by cutting out a part of the flange 38 in a planar shape. Further, a substantially annular cylinder cap mounting groove 39 (see FIGS. 2 and 3) to which the cap 26 is coupled is formed by the bottom surface of the flange 38, the outer peripheral surface of the cylindrical portion 37, and the cylinder end surface 24a.

図２及び図３に戻って、弁ガイド部材２４内には、管路３１と同軸に延びかつ先端が先端側シリンダ開口３５として開放されている直管状の直管管路４１と、この直管管路４１の後端に接続した管状の弁受け部４２とが形成されている。 2 and 3, the valve guide member 24 has a straight tubular pipe 41 extending coaxially with the pipe 31 and having a distal end opened as a tip side cylinder opening 35, and the straight pipe. A tubular valve receiver 42 connected to the rear end of the pipe 41 is formed.

弁ガイド部材２４における直管管路４１の側方に位置する部分には、負圧源通路２１に接続する接続パイプ４４が設けられている。この接続パイプ４４は、直管管路４１に対して略直交する方向に長く延びており、負圧源通路２１の一部を構成している。直管管路４１の内壁には、接続パイプ４４に通じる接続口４５が開口している。 A connection pipe 44 connected to the negative pressure source passage 21 is provided at a portion of the valve guide member 24 located on the side of the straight pipe line 41. The connection pipe 44 extends long in a direction substantially orthogonal to the straight pipe line 41 and constitutes a part of the negative pressure source passage 21. A connection port 45 leading to the connection pipe 44 is opened on the inner wall of the straight pipe line 41.

弁受け部４２は、その後端が後端側シリンダ開口（第１シリンダ開口）４６として開放されている。この弁受け部４２には、後端側シリンダ開口４６から先端側シリンダ開口３５に向かう方向に沿って、第１錐形管路４７と第２錐形管路４８とが形成されている。第１錐形管路４７は、本発明の錐形管路に相当するものであり、先端側シリンダ開口３５に向かうのに従って次第に径が狭くなる。第２錐形管路４８は、先端側シリンダ開口３５に向かうに従って次第に径が広くなる形状を有しており、第１錐形管路４７の先端と直管管路４１の後端とを接続する。 The rear end of the valve receiver 42 is opened as a rear end side cylinder opening (first cylinder opening) 46. A first conical conduit 47 and a second conical conduit 48 are formed in the valve receiver 42 along the direction from the rear end side cylinder opening 46 toward the front end side cylinder opening 35. The first conical pipe 47 corresponds to the conical pipe of the present invention, and the diameter gradually decreases toward the tip side cylinder opening 35. The second conical pipe line 48 has a shape that gradually increases in diameter toward the distal end side cylinder opening 35, and connects the front end of the first conical pipe line 47 and the rear end of the straight pipe line 41. To do.

図２と図３と図５（Ａ），（Ｂ）において、連結プランジャ２５は、弁ガイド部材２４にその軸方向に移動自在に収容されており、押圧操作または押圧解除により吸引通路１７と負圧源通路２１との連通／遮断を切り替える。 2, 3, and 5 (A) and 5 (B), the connecting plunger 25 is accommodated in the valve guide member 24 so as to be movable in the axial direction thereof. The communication / blocking with the pressure source passage 21 is switched.

連結プランジャ２５は、弁機構部２５ａと押圧操作部２５ｂとを連結してなる。弁機構部２５ａは、本体軸部５０と、略錐形状の弁部（以下、単に錐形弁部という）５１とを備えている。 The connection plunger 25 is formed by connecting the valve mechanism portion 25a and the pressing operation portion 25b. The valve mechanism portion 25 a includes a main body shaft portion 50 and a substantially conical valve portion (hereinafter simply referred to as a conical valve portion) 51.

本体軸部５０は、後端側シリンダ開口４６から第１及び第２錐形管路４７，４８、直管管路４１内に挿入され、その第１先端部５０ａが吸引ＯＦＦ時には先端側シリンダ開口３５の近傍まで達している。この第１先端部５０ａの先端には、その軸方向前方に向けて長く延びた一対の爪部５２が設けられている。 The main body shaft portion 50 is inserted into the first and second conical pipe lines 47 and 48 and the straight pipe line 41 from the rear end side cylinder opening 46, and the front end side cylinder opening is opened when the first front end portion 50a is suction-off. It has reached the vicinity of 35. At the tip of the first tip 50a, a pair of claws 52 that extend long toward the front in the axial direction are provided.

一対の爪部５２は、吸引ＯＦＦ時には先端側シリンダ開口３５から突出する。この一対の爪部５２の先端部には、それぞれ互いに対向する面とは反対側の面に係合爪５２ａが形成されている。 The pair of claw portions 52 protrudes from the tip side cylinder opening 35 when suction is OFF. Engaging claws 52a are formed on the surfaces of the pair of claws 52 on the opposite sides of the surfaces facing each other.

錐形弁部５１は、本体軸部５０の第１後端部５０ｂに設けられている。錐形弁部５１は、第１錐形管路４７の内壁に沿う形状を有しており、その最大径が第１錐形管路４７の内径よりも大きくなるように形成されている。 The conical valve portion 51 is provided at the first rear end portion 50 b of the main body shaft portion 50. The cone-shaped valve portion 51 has a shape along the inner wall of the first cone-shaped pipe 47 and is formed so that the maximum diameter is larger than the inner diameter of the first cone-shaped pipe 47.

押圧操作部２５ｂは、先端側シリンダ開口３５上に突出した状態で、弁機構部２５ａと同軸に延びている。押圧操作部２５ｂの第２先端部５４ａの先端には、吸引ＯＮ時に術者からの押圧操作を受け付ける略円板状の頭部５５が設けられている。 The pressing operation part 25b extends coaxially with the valve mechanism part 25a in a state of protruding onto the distal end side cylinder opening 35. A substantially disc-shaped head portion 55 is provided at the distal end of the second distal end portion 54a of the pressing operation portion 25b to receive a pressing operation from the operator when suction is ON.

押圧操作部２５ｂの第２後端部５４ｂには、その軸方向に長く延び、かつ一対の爪部５２が係合する爪係合穴５６が形成されている。この爪係合穴５６の内径は、一対の係合爪５２ａの間隔よりも小さく形成されている。また、第２後端部５４ｂの側面には、爪係合穴５６に通じる一対の開口窓５８が形成されている。各開口窓５８は、１８０度ピッチ間隔で形成されており、その縁にはそれぞれ一対の爪部５２の係合爪５２ａが引っ掛けられる。これにより、一対の爪部５２が爪係合穴５６に係合して、弁機構部２５ａと押圧操作部２５ｂとが連結される。 A claw engagement hole 56 that extends long in the axial direction and engages with the pair of claw portions 52 is formed in the second rear end portion 54b of the pressing operation portion 25b. The inner diameter of the claw engagement hole 56 is formed smaller than the distance between the pair of engagement claws 52a. In addition, a pair of opening windows 58 communicating with the claw engagement holes 56 are formed on the side surface of the second rear end portion 54b. The opening windows 58 are formed at a pitch interval of 180 degrees, and the engaging claws 52a of the pair of claw portions 52 are hooked on the edges thereof. Thereby, a pair of nail | claw part 52 engages with the nail | claw engaging hole 56, and the valve mechanism part 25a and the press operation part 25b are connected.

また、第２先端部５４ａと第２後端部５４ｂとの間には、ストッパ部６０（図５参照）が設けられている。ストッパ部６０は、先端側シリンダ開口３５から遠ざかるのに従い次第に拡径する錐形状を有している。このストッパ部６０は、押圧操作部２５ｂが先端側シリンダ開口３５内に押し込まれたときに、先端側シリンダ開口３５に当接してさらなる押し込みを規制する。 Further, a stopper portion 60 (see FIG. 5) is provided between the second front end portion 54a and the second rear end portion 54b. The stopper portion 60 has a conical shape that gradually increases in diameter as it moves away from the tip side cylinder opening 35. When the pressing operation portion 25b is pushed into the distal end side cylinder opening 35, the stopper portion 60 abuts against the distal end side cylinder opening 35 and restricts further pushing.

上記構成の連結プランジャ２５は、頭部５５に対する押圧操作がなされていないときに、錐形弁部５１が第１錐形管路４７の内壁に当接して後端側シリンダ開口４６を閉塞することにより、吸引通路１７と負圧源通路２１との連通を遮断する遮断状態になる（図２参照）。また、連結プランジャ２５は、頭部５５に対する押圧操作により押圧操作部２５ｂが先端側シリンダ開口３５内に所定量押し込まれたときに、錐形弁部５１が第１錐形管路４７の内壁から離れて後端側シリンダ開口４６を開放することで、吸引通路１７と負圧源通路２１とを連通する連通状態になる（図３参照）。なお、ここでいう所定量とは、例えば、ストッパ部６０が先端側シリンダ開口３５に当接してさらなる押し込みが規制されるまでの押し込み量である。 In the connection plunger 25 having the above-described configuration, when the pressing operation is not performed on the head portion 55, the conical valve portion 51 abuts against the inner wall of the first conical conduit 47 and closes the rear end side cylinder opening 46. As a result, the communication between the suction passage 17 and the negative pressure source passage 21 is cut off (see FIG. 2). Further, the connecting plunger 25 is configured such that when the pressing operation portion 25 b is pushed into the distal end side cylinder opening 35 by a predetermined amount by the pressing operation on the head portion 55, the conical valve portion 51 extends from the inner wall of the first conical conduit 47. By opening the rear end side cylinder opening 46 away from each other, the suction passage 17 and the negative pressure source passage 21 are communicated with each other (see FIG. 3). Here, the predetermined amount is, for example, the amount of pushing until the stopper portion 60 contacts the tip side cylinder opening 35 and further pushing is restricted.

本体軸部５０の外周面には、その軸方向に長く延びた吸引物通路６１が形成されている。吸引物通路６１の長さは、連結プランジャ２５が連通状態に切り替えられたときに、通路先端部６１ａが接続口４５の略前方に位置し、かつ通路後端部６１ｂが弁受け部４２よりも管路３１側に位置するような長さに調整されている。 An aspirant passage 61 extending in the axial direction is formed on the outer peripheral surface of the main body shaft portion 50. The length of the aspirant passage 61 is such that when the connecting plunger 25 is switched to the communication state, the passage front end portion 61a is positioned substantially in front of the connection port 45, and the passage rear end portion 61b is more than the valve receiving portion 42. The length is adjusted so as to be located on the pipe 31 side.

頭部５５には、その外周部の一部を切り欠くことにより、キャップ２６との回転止めに用いられるキャップ回転止め溝６２（図５参照）が形成されている。また、頭部５５とストッパ部６０との間には、キャップ２６を連結するための略環状のプランジャ用キャップ取付溝６３（図２及び図３参照）が形成されている。 A cap rotation stop groove 62 (see FIG. 5) used for rotation prevention with the cap 26 is formed in the head portion 55 by cutting out a part of the outer peripheral portion thereof. A substantially annular plunger cap mounting groove 63 (see FIGS. 2 and 3) for connecting the cap 26 is formed between the head portion 55 and the stopper portion 60.

図２及び図３において、キャップ２６は、ゴムなどの弾性材料で形成されている。キャップ２６は、頭部５５に連結される略円板状の蓋部６５と、蓋部６５と押圧操作部２５ｂと円筒部３７とを囲む略筒形状を有し、円筒部３７に連結されるスカート部６６とが一体形成されてなる。 2 and 3, the cap 26 is formed of an elastic material such as rubber. The cap 26 has a substantially disc-shaped lid portion 65 coupled to the head portion 55, a substantially cylindrical shape surrounding the lid portion 65, the pressing operation portion 25 b, and the cylindrical portion 37, and is coupled to the cylindrical portion 37. The skirt portion 66 is integrally formed.

図６（Ａ）に示すように、蓋部６５の上面には、頭部５５が嵌合する嵌合穴６７が形成されている。この嵌合穴６７の内周壁には、頭部５５のキャップ回転止め溝６２に係合する回転止め用突起６８が設けられている。これにより、連結プランジャ２５とキャップ２６との間が回転規制される。 As shown in FIG. 6A, a fitting hole 67 into which the head portion 55 is fitted is formed on the upper surface of the lid portion 65. On the inner peripheral wall of the fitting hole 67, a rotation stop projection 68 that engages with the cap rotation stop groove 62 of the head portion 55 is provided. Thereby, rotation between the coupling plunger 25 and the cap 26 is restricted.

嵌合穴６７の底部の中心には、押圧操作部２５ｂの一部が貫通する貫通穴６９が形成されている。この貫通穴６９を構成する環状の内壁部７０は、上述のプランジャ用キャップ取付溝６３に嵌合する。これにより、連結プランジャ２５と蓋部６５とが連結する。 A through hole 69 through which a part of the pressing operation portion 25 b passes is formed at the center of the bottom of the fitting hole 67. The annular inner wall portion 70 constituting the through hole 69 is fitted into the plunger cap mounting groove 63 described above. Thereby, the connection plunger 25 and the cover part 65 are connected.

図６（Ｂ）に示すように、スカート部６６は、その先端部が蓋部６５の外周と一体化している。また、スカート部６６の後端部には、円筒部３７が嵌合する嵌合穴７２を有する略環状の底部７３が設けられている。底部７３の内周壁には、上述のシリンダ用キャップ取付溝３９に嵌合する溝嵌合部７３ａと、円筒部３７の上端面の外周部分を覆い、溝嵌合部７３ａとの間でフランジ３８を挟持する環状凸部７３ｂとが形成されている。これにより、円筒部３７が嵌合穴７２に嵌合した状態で底部７３と連結される。また、スカート部６６には、１８０度ピッチ間隔で大気と連通する一対の通気穴７５が形成されている。 As shown in FIG. 6B, the tip of the skirt portion 66 is integrated with the outer periphery of the lid portion 65. In addition, a substantially annular bottom portion 73 having a fitting hole 72 into which the cylindrical portion 37 is fitted is provided at the rear end portion of the skirt portion 66. The inner peripheral wall of the bottom portion 73 covers the outer peripheral portion of the upper end surface of the cylindrical portion 37 and the groove fitting portion 73a that fits into the above-described cylinder cap mounting groove 39, and the flange 38 between the groove fitting portion 73a. An annular convex portion 73b is formed. Accordingly, the cylindrical portion 37 is connected to the bottom portion 73 in a state where the cylindrical portion 37 is fitted in the fitting hole 72. The skirt portion 66 is formed with a pair of ventilation holes 75 communicating with the atmosphere at a pitch interval of 180 degrees.

底部７３の内周壁の一部には、フランジ３８のキャップ回転止め面３８ａに当接する略平面状のガイド部材回転止め面７３ｃが形成されている。これにより、弁ガイド部材２４とキャップ２６とが回転規制される。さらに、このキャップ２６を介して、弁ガイド部材２４と連結プランジャ２５とが間接的に回転規制される。これら両者の間接的な回転規制により、連通状態時の連結プランジャ２５の通路先端部６１ａを接続口４５に略対向させることができる。また、これと同時に、押圧操作部２５ｂの開口窓５８を通気穴７５に略対向させることができる。 A part of the inner peripheral wall of the bottom portion 73 is formed with a substantially planar guide member rotation stop surface 73c that abuts against the cap rotation stop surface 38a of the flange 38. Thereby, the rotation of the valve guide member 24 and the cap 26 is restricted. Further, the rotation of the valve guide member 24 and the connecting plunger 25 is indirectly restricted via the cap 26. By these two indirect rotation restrictions, the passage tip portion 61a of the coupling plunger 25 in the communication state can be made substantially opposite to the connection port 45. At the same time, the opening window 58 of the pressing operation portion 25 b can be made substantially opposite to the vent hole 75.

蓋部６５の底面上でかつ環状凸部７３ｂの略上方に位置する部分には、押圧操作部２５ｂの外周を囲むように略環状の環状リブ７７が設けられている。環状リブ７７は、キャップ２６と同様にゴムなどの弾性材料からなり、キャップ２６と一体に形成される。この環状リブ７７は、押圧操作部２５ｂに近づくのに従い次第に蓋部６５の底面から遠ざかるような略凹錐形状を有している。 A substantially annular ring rib 77 is provided at a portion located on the bottom surface of the lid 65 and substantially above the annular protrusion 73b so as to surround the outer periphery of the pressing operation part 25b. The annular rib 77 is made of an elastic material such as rubber like the cap 26 and is formed integrally with the cap 26. The annular rib 77 has a substantially concave cone shape that gradually moves away from the bottom surface of the lid portion 65 as it approaches the pressing operation portion 25b.

図２及び図３に戻って、キャップ２６は、連結プランジャ２５を図中上方向に向けて付勢することで、この連結プランジャ２５を遮断状態で維持する。蓋部６５は、頭部５５に対する押圧操作により押圧操作部２５ｂが先端側シリンダ開口３５内に押し込まれたときに、円筒部３７に向けて移動する。 Returning to FIGS. 2 and 3, the cap 26 biases the coupling plunger 25 in the upward direction in the drawing, thereby maintaining the coupling plunger 25 in the blocked state. The lid portion 65 moves toward the cylindrical portion 37 when the pressing operation portion 25 b is pushed into the distal end side cylinder opening 35 by a pressing operation on the head portion 55.

スカート部６６は、押圧操作による蓋部６５の移動に伴い、蓋部６５とシリンダ端面２４ａとの間で圧縮されて、連結プランジャ２５の径方向に拡径するとともにその軸方向に収縮（以下、適宜弾性変形という）する。弾性変形したスカート部６６は、頭部５５に対する押圧操作が解除されたときに弾性復元力により元の形状に復元する。 The skirt portion 66 is compressed between the lid portion 65 and the cylinder end surface 24a in accordance with the movement of the lid portion 65 by the pressing operation, and expands in the radial direction of the connecting plunger 25 and contracts in the axial direction (hereinafter referred to as “the skirt portion 66”). It is called elastic deformation as appropriate). The elastically deformed skirt portion 66 is restored to its original shape by an elastic restoring force when the pressing operation on the head portion 55 is released.

環状リブ７７は、通気穴７５と先端側シリンダ開口３５との連通／連通遮断の切り替えを行う。環状リブ７７は、連結プランジャ２５が遮断状態のときは環状凸部７３ｂとの間に空間を形成することで、先端側シリンダ開口３５を通気穴７５と連通させる。また、環状リブ７７は、連結プランジャ２５が連通状態のときは環状凸部７３ｂの上面に圧接することで通気穴７５と先端側シリンダ開口３５との連通を遮断する。 The annular rib 77 switches communication / communication blocking between the vent hole 75 and the tip side cylinder opening 35. When the connecting plunger 25 is in the cut-off state, the annular rib 77 forms a space between the annular convex portion 73 b and allows the tip side cylinder opening 35 to communicate with the vent hole 75. Further, when the connecting plunger 25 is in a communicating state, the annular rib 77 is pressed against the upper surface of the annular convex portion 73b to block communication between the vent hole 75 and the tip side cylinder opening 35.

次に、図７を用いて上記構成の吸引ボタン１８における連結プランジャ２５の組み込み方法について具体的に説明する。最初に、弁機構部２５ａの第１先端部５０ａ及び一対の爪部５２を後端側シリンダ開口４６から第１及び第２錐形管路４７，４８、直管管路４１内に挿入する。この弁機構部２５ａの挿入は、一対の爪部５２が先端側シリンダ開口３５から突出するまで継続する。 Next, a method for assembling the connecting plunger 25 in the suction button 18 having the above-described configuration will be specifically described with reference to FIG. First, the first tip 50a and the pair of claws 52 of the valve mechanism 25a are inserted into the first and second conical pipes 47 and 48 and the straight pipe 41 from the rear end side cylinder opening 46. The insertion of the valve mechanism 25a is continued until the pair of claw portions 52 protrude from the distal end side cylinder opening 35.

一対の爪部５２が先端側シリンダ開口３５から突出した後、先端側シリンダ開口３５側に配置した押圧操作部２５ｂの爪係合穴５６に一対の爪部５２を挿入する。この際には、一対の爪部５２の係合爪５２ａと押圧操作部２５ｂの開口窓５８との位置を合わせてから、一対の爪部５２を爪係合穴５６内に挿入する。一対の爪部５２は、爪係合穴５６に挿入されたとき互いに近づく方向に弾性変形した状態となり、引き続き爪係合穴５６の奥に挿入されて係合爪５２ａが開口窓５８に達したときに元の状態に復元する。これにより、係合爪５２ａが開口窓５８の縁に引っ掛かることで一対の爪部５２が爪係合穴５６に係合して、弁機構部２５ａと押圧操作部２５ｂとが連結する。こうして、連結プランジャ２５が弁ガイド部材２４に組み込まれる。 After the pair of claw portions 52 protrude from the front end side cylinder opening 35, the pair of claw portions 52 are inserted into the claw engagement holes 56 of the pressing operation portion 25b disposed on the front end side cylinder opening 35 side. At this time, after the positions of the engaging claws 52 a of the pair of claw parts 52 and the opening window 58 of the pressing operation part 25 b are aligned, the pair of claw parts 52 are inserted into the claw engaging holes 56. When the pair of claw portions 52 are inserted into the claw engagement holes 56, the pair of claw portions 52 are elastically deformed in a direction approaching each other, and are continuously inserted into the claw engagement holes 56 so that the engagement claw 52 a reaches the opening window 58. Sometimes restore to the original state. As a result, when the engaging claw 52a is hooked on the edge of the opening window 58, the pair of claw portions 52 engage with the claw engaging holes 56, and the valve mechanism portion 25a and the pressing operation portion 25b are connected. Thus, the connecting plunger 25 is incorporated into the valve guide member 24.

このように本発明では、２分割構造の連結プランジャ２５を弁ガイド部材２４に組み込む際に、弁機構部２５ａを後端側シリンダ開口４６側から弁ガイド部材２４内に挿入するので、第１錐形管路４７内に錐形弁部５１を通す必要がなくなる。その結果、錐形弁部５１の径ｄ１を第１錐形管路４７の内径ｄ２よりも十分に大きくした場合でも連結プランジャ２５を弁ガイド部材２４に容易に組み込むことができる。また、弁機構部２５ａと押圧操作部２５ｂとの連結を解除することにより、両者を分離して洗浄消毒処理を施すことができる。さらに、洗浄消毒処理後の連結プランジャ２５の組み込みをユーザが容易に実行することができる。 As described above, in the present invention, when the connecting plunger 25 having the two-part structure is incorporated into the valve guide member 24, the valve mechanism 25a is inserted into the valve guide member 24 from the rear end side cylinder opening 46 side. It is not necessary to pass the conical valve part 51 through the shaped pipe 47. As a result, even when the diameter d1 of the conical valve portion 51 is sufficiently larger than the inner diameter d2 of the first conical pipe 47, the connecting plunger 25 can be easily incorporated into the valve guide member 24. Further, by releasing the connection between the valve mechanism portion 25a and the pressing operation portion 25b, both can be separated and subjected to a cleaning / disinfecting process. Further, the user can easily perform the incorporation of the connecting plunger 25 after the cleaning / disinfecting process.

なお、上記説明では、弁機構部２５ａを弁ガイド部材２４内に挿入してから押圧操作部２５ｂを弁機構部２５ａに連結する場合について説明を行ったが、先に押圧操作部２５ｂの第２後端部５４ｂを先端側シリンダ開口３５内に挿入してから、弁機構部２５ａを押圧操作部２５ｂに連結してもよい。 In the above description, the case in which the valve operating portion 25b is connected to the valve mechanism 25a after the valve mechanism 25a is inserted into the valve guide member 24 has been described. After the rear end portion 54b is inserted into the front end side cylinder opening 35, the valve mechanism portion 25a may be connected to the pressing operation portion 25b.

連結プランジャ２５を弁ガイド部材２４に組み込んだ後、キャップ２６が連結プランジャ２５と弁ガイド部材２４とにそれぞれ連結される。これにより、連結プランジャ２５が遮断状態で維持される。 After the coupling plunger 25 is incorporated in the valve guide member 24, the cap 26 is coupled to the coupling plunger 25 and the valve guide member 24, respectively. Thereby, the connection plunger 25 is maintained in the interruption | blocking state.

この際に図８に示すように、押圧操作部２５ｂの開口窓５８がキャップ２６の通気穴７５と略対向するように、キャップ２６を介して連結プランジャ２５と弁ガイド部材２４とが間接的に回転規制されている。このため、通気穴７５及び開口窓５８を通して、一対の爪部５２が爪係合穴５６に係合していることを目視で確認することができる。 At this time, as shown in FIG. 8, the coupling plunger 25 and the valve guide member 24 are indirectly connected via the cap 26 so that the opening window 58 of the pressing operation portion 25b is substantially opposed to the vent hole 75 of the cap 26. Rotation is restricted. For this reason, it can be visually confirmed through the ventilation hole 75 and the opening window 58 that the pair of claw portions 52 are engaged with the claw engagement holes 56.

次に、上記構成の吸引ボタン１８の作用について説明を行う。内視鏡検査時には、吸引ポンプ２０による吸引が常時行われる。吸引ＯＦＦ時には、図９に示すようにキャップ２６により連結プランジャ２５が遮断状態で維持されるので、錐形弁部５１が第１錐形管路４７の内壁に押し付けられた状態となる。 Next, the operation of the suction button 18 having the above configuration will be described. During endoscopic examination, suction by the suction pump 20 is always performed. At the time of suction OFF, as shown in FIG. 9, the coupling plunger 25 is maintained in the shut-off state by the cap 26, so that the conical valve portion 51 is pressed against the inner wall of the first conical pipe line 47.

この際に、錐形弁部５１の外周壁は第１錐形管路４７の内壁にフィットする形状であるので、錐形弁部５１は第１錐形管路４７の内壁に隙間なく密着する。さらに、上述したように、錐形弁部５１の径ｄ１を第１錐形管路４７の内径ｄ２よりも十分に大きくすることができるので、弁受け部４２や第１錐形管路４７の形状の誤差や、連結プランジャ２５のがたつきなどが発生した場合でも、後端側シリンダ開口４６を確実に塞ぐことができる。このため、吸引口１５から各種体液や固形物（以下、吸引物という）が吸引されて直管管路４１内などに漏れることが防止される。また、遮断状態時に、錐形弁部５１が直管管路４１内に入り込むことが防止される。 At this time, since the outer peripheral wall of the conical valve portion 51 is shaped to fit the inner wall of the first conical conduit 47, the conical valve portion 51 is in close contact with the inner wall of the first conical conduit 47 without a gap. . Furthermore, as described above, the diameter d1 of the cone-shaped valve part 51 can be made sufficiently larger than the inner diameter d2 of the first cone-shaped pipe line 47, so that the valve receiving part 42 and the first cone-shaped pipe line 47 Even when a shape error or rattling of the connecting plunger 25 occurs, the rear end side cylinder opening 46 can be reliably closed. For this reason, various body fluids and solids (hereinafter referred to as a suction product) are sucked from the suction port 15 and are prevented from leaking into the straight pipe line 41 or the like. Further, the conical valve portion 51 is prevented from entering the straight pipe line 41 in the shut-off state.

このように吸引通路１７と負圧源通路２１との連通が完全に遮断（図中、２点鎖線で表示）されるので、吸引口１５からの吸引が停止した状態となる。また、このときに環状リブ７７が環状凸部７３ｂの図中上方に離れており、両者の間には空間が形成されているので、先端側シリンダ開口３５は通気穴７５を介して大気と連通する。このため、接続口４５、直管管路４１と連結プランジャ２５との隙間、先端側シリンダ開口３５と連結プランジャ２５との隙間、及び通気穴７５を介して、負圧源通路２１が大気と連通する（図中、実線で表示）。その結果、吸引ポンプ２０に負荷がかかることが防止される。 Thus, since the communication between the suction passage 17 and the negative pressure source passage 21 is completely blocked (indicated by a two-dot chain line in the figure), the suction from the suction port 15 is stopped. Further, at this time, the annular rib 77 is separated upward in the figure of the annular convex portion 73b, and a space is formed between the two, so that the tip side cylinder opening 35 communicates with the atmosphere via the vent hole 75. To do. For this reason, the negative pressure source passage 21 communicates with the atmosphere through the connection port 45, the gap between the straight pipe line 41 and the coupling plunger 25, the gap between the tip side cylinder opening 35 and the coupling plunger 25, and the vent hole 75. (Displayed with a solid line in the figure). As a result, the suction pump 20 is prevented from being loaded.

吸引を行う場合には、図１０に示すように、頭部５５に対する押圧操作により押圧操作部２５ｂが先端側シリンダ開口３５内に押し込まれる。これにより、キャップ２６の蓋部６５が円筒部３７に向けて移動するとともに、スカート部６６が弾性変形する。この蓋部６５の移動の途中で環状リブ７７が環状凸部７３ｂの上面に接触し、さらに押圧操作が継続すると、環状リブ７７が環状凸部７３ｂに圧接される。この押圧操作は、ストッパ部６０が先端側シリンダ開口３５に当接するまで継続する。 When performing suction, as shown in FIG. 10, the pressing operation portion 25 b is pushed into the distal end side cylinder opening 35 by a pressing operation on the head 55. As a result, the lid portion 65 of the cap 26 moves toward the cylindrical portion 37 and the skirt portion 66 is elastically deformed. If the annular rib 77 comes into contact with the upper surface of the annular convex portion 73b during the movement of the lid portion 65 and the pressing operation continues, the annular rib 77 is pressed against the annular convex portion 73b. This pressing operation is continued until the stopper portion 60 comes into contact with the distal end side cylinder opening 35.

ストッパ部６０が先端側シリンダ開口３５に当接すると、連結プランジャ２５が遮断状態から連通状態に切り替わり、錐形弁部５１が第１錐形管路４７の内壁から後端側シリンダ開口４６の前方（図中下方）に離れることで、後端側シリンダ開口４６が開放される。これにより、吸引通路１７と負圧源通路２１とが連通する。また、環状リブ７７が環状凸部７３ｂに圧接することで、先端側シリンダ開口３５と通気穴７５との連通が遮断されるため、負圧源通路２１と大気との連通が遮断される（図中、２点鎖線で表示）。 When the stopper portion 60 comes into contact with the front end side cylinder opening 35, the connecting plunger 25 is switched from the shut-off state to the communication state, and the conical valve portion 51 moves from the inner wall of the first conical pipe line 47 to the front of the rear end side cylinder opening 46. The rear end side cylinder opening 46 is opened by moving away (downward in the figure). Thereby, the suction passage 17 and the negative pressure source passage 21 communicate with each other. Further, since the annular rib 77 is brought into pressure contact with the annular convex portion 73b, the communication between the tip side cylinder opening 35 and the vent hole 75 is blocked, and therefore the communication between the negative pressure source passage 21 and the atmosphere is blocked (see FIG. Middle, indicated by a two-dot chain line).

このように吸引通路１７と負圧源通路２１とが連通するとともに、負圧源通路２１と大気との連通が遮断されることで、負圧源通路２１内及びこれに通じる各管路内の負圧吸引力が増加して、吸引口１５から吸引物が吸引される。吸引物は、吸引通路１７、吸引接続口３２、及び管路３１を経た後、図中の実線で示すように、直管管路４１及び吸引物通路６１、接続口４５、負圧源通路２１を通って内視鏡１０の外部に排出される。 In this way, the suction passage 17 and the negative pressure source passage 21 communicate with each other, and the communication between the negative pressure source passage 21 and the atmosphere is interrupted, so that the inside of the negative pressure source passage 21 and each pipe line leading to the passage are connected. The negative pressure suction force is increased, and the suction object is sucked from the suction port 15. The suctioned material passes through the suction passage 17, the suction connection port 32, and the conduit 31, and then, as shown by the solid line in the figure, the straight pipe conduit 41, the suction material passage 61, the connection port 45, and the negative pressure source passage 21. It is discharged to the outside of the endoscope 10 through.

吸引を停止する場合には、頭部５５に対する押圧操作を解除することにより、上述の図９で説明したように、吸引通路１７と負圧源通路２１との連通が遮断されるとともに、負圧源通路２１が大気と連通して、吸引口１５からの吸引が停止される。以下、吸引を行う場合には押圧操作により連結プランジャ２５を連通状態に切り替え、逆に吸引を停止する場合には押圧操作を解除して連結プランジャ２５を遮断状態に切り替える。 When stopping the suction, by releasing the pressing operation on the head 55, the communication between the suction passage 17 and the negative pressure source passage 21 is blocked and the negative pressure is released as described above with reference to FIG. The source passage 21 communicates with the atmosphere, and suction from the suction port 15 is stopped. Hereinafter, when the suction is performed, the connecting plunger 25 is switched to the communication state by a pressing operation. Conversely, when the suction is stopped, the pressing operation is canceled and the connecting plunger 25 is switched to the shut-off state.

［第２実施形態］
次に、本発明の第２実施形態の吸引ボタン８０について説明を行う。上記第１実施形態の吸引ボタン１８では、弁機構部２５ａの一対の爪部５２の先端が押圧操作部２５ｂの内部に納まっているが、吸引ボタン８０では一対の爪部の先端が押圧操作部外に露出している。 [Second Embodiment]
Next, the suction button 80 according to the second embodiment of the present invention will be described. In the suction button 18 of the first embodiment, the tips of the pair of claw portions 52 of the valve mechanism 25a are housed in the pressing operation portion 25b. In the suction button 80, the tips of the pair of claw portions are pressed operation portions. Exposed outside.

吸引ＯＦＦ時の状態を示す図１１、及び吸引ＯＮ時の状態を示す図１２において、吸引ボタン８０は、連結プランジャ８１の構造が異なる点を除けば、基本的には第１実施形態の吸引ボタン１８と同じ構成である。なお、吸引ボタン１８と機能・構成上同一のものについては、同一符号を付してその説明は省略する。 11 showing the state when the suction is turned off and FIG. 12 showing the state when the suction is turned on, the suction button 80 is basically the suction button of the first embodiment except that the structure of the connecting plunger 81 is different. 18 is the same configuration. In addition, about the thing functionally same as the suction button 18, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

連結プランジャ８１は、弁機構部８１ａと押圧操作部８１ｂとを連結してなる。図１３（Ａ）、（Ｂ）に示すように、弁機構部８１ａは、第１実施形態の弁機構部２５ａと同様に、本体軸部５０と錐形弁部５１と吸引物通路６１とを有しているが、第１先端部５０ａには第１実施形態とは異なる一対の爪部８２が設けられている。 The connection plunger 81 connects the valve mechanism part 81a and the pressing operation part 81b. As shown in FIGS. 13A and 13B, the valve mechanism portion 81a includes the main body shaft portion 50, the conical valve portion 51, and the aspirate passage 61 in the same manner as the valve mechanism portion 25a of the first embodiment. Although it has, a pair of nail | claw part 82 different from 1st Embodiment is provided in the 1st front-end | tip part 50a.

一対の爪部８２は、その長さが押圧操作部８１ｂの軸方向長さとほぼ同じ長さに形成されている。この一対の爪部８２の先端部には、それぞれ互いに対向する面とは反対側の面に係合爪８２ａが形成されている。 The pair of claw portions 82 are formed to have a length substantially the same as the axial length of the pressing operation portion 81b. Engaging claws 82a are formed on the surfaces of the pair of claws 82 on the opposite sides of the surfaces facing each other.

押圧操作部８１ｂには、その軸方向に貫通する爪係合穴８３が形成されている。また、押圧操作部８１ｂの頭部５５の表面には、その外周部を除く部分を切り欠いて形成した凹部８５が形成されている。この凹部８５の底面上には、爪係合穴８３の開口縁の一部を切り欠くことにより、係合爪８２ａが引っ掛けられる切り欠き部８６が形成されている。また、凹部８５内には、爪係合穴８３の開口を２分割する分割板８７が形成されている。 A claw engagement hole 83 penetrating in the axial direction is formed in the pressing operation portion 81b. Further, a concave portion 85 is formed on the surface of the head portion 55 of the pressing operation portion 81b by cutting out a portion excluding the outer peripheral portion. On the bottom surface of the recess 85, a notch 86 is formed to which the engaging claw 82 a is hooked by cutting out a part of the opening edge of the claw engaging hole 83. In addition, a dividing plate 87 that divides the opening of the claw engaging hole 83 into two is formed in the recess 85.

図１１及び図１２に戻って、上記構成の連結プランジャ８１を弁ガイド部材２４に組み込む手順は第１実施形態と同じであり、弁機構部８１ａを後端側シリンダ開口４６側から弁ガイド部材２４内に挿入した後、一対の爪部８２を押圧操作部８１ｂの爪係合穴８３内に挿入する。これにより、一対の爪部８２の係合爪８２ａが切り欠き部８６に引っ掛かることで、一対の爪部８２が爪係合穴８３に係合して、弁機構部８１ａと押圧操作部８１ｂとが連結する。第１実施形態と同様に錐形弁部５１が第１錐形管路４７内を通過しないので、錐形弁部５１の径を第１錐形管路４７の内径よりも十分に大きくすることができ、第１実施形態と同様の効果が得られる。 11 and 12, the procedure for incorporating the connection plunger 81 having the above-described configuration into the valve guide member 24 is the same as that in the first embodiment, and the valve mechanism portion 81a is connected to the valve guide member 24 from the rear end side cylinder opening 46 side. After the insertion, the pair of claw portions 82 are inserted into the claw engagement holes 83 of the pressing operation portion 81b. As a result, the engaging claws 82a of the pair of claw portions 82 are hooked on the notch portions 86, so that the pair of claw portions 82 engage with the claw engaging holes 83, and the valve mechanism portion 81a and the pressing operation portion 81b. Are linked. Since the conical valve portion 51 does not pass through the first conical conduit 47 as in the first embodiment, the diameter of the conical valve portion 51 should be sufficiently larger than the inner diameter of the first conical conduit 47. Thus, the same effect as in the first embodiment can be obtained.

また、一対の爪部８２が爪係合穴８３に係合した際に、一対の爪部８２の先端部が頭部５５上に露呈する。このため、図１４（Ａ）中の矢印で示すように、一対の爪部８２の先端部をつまみ操作することで、図１４（Ｂ）に示すように、一対の爪部８２と爪係合穴８３との係合を解除して、押圧操作部８１ｂから弁機構部８１ａを分離させることができる。これにより、吸引ボタン８０の分解・洗浄消毒処理を容易に行うことができ、さらに第１実施形態と同様に洗浄消毒処理後の連結プランジャ８１の組み込みを容易に行うことができる。 Further, when the pair of claw portions 82 are engaged with the claw engagement holes 83, the tip portions of the pair of claw portions 82 are exposed on the head 55. For this reason, as shown by the arrow in FIG. 14 (A), by operating the tip of the pair of claw portions 82, the pair of claw portions 82 and the claw engagement as shown in FIG. 14 (B). The engagement with the hole 83 can be released, and the valve mechanism 81a can be separated from the pressing operation portion 81b. Thereby, the disassembly / cleaning / disinfecting process of the suction button 80 can be easily performed, and the connecting plunger 81 after the cleaning / disinfecting process can be easily incorporated as in the first embodiment.

なお、吸引ボタン８０の作用は、上記第１実施形態で説明した吸引ボタン１８の作用と基本的に同じであるので、ここでは説明を省略する。また、第２実施形態では、一対の爪部８２の長さが押圧操作部８１ｂの軸方向長さとほぼ同じ長さに形成されているが、一対の爪部８２の長さが押圧操作部８１ｂの軸方向長さよりも長く形成されていてもよい。 Since the action of the suction button 80 is basically the same as the action of the suction button 18 described in the first embodiment, the description thereof is omitted here. In the second embodiment, the length of the pair of claws 82 is formed to be substantially the same as the axial length of the pressing operation portion 81b, but the length of the pair of claws 82 is the pressing operation portion 81b. It may be formed longer than the axial length.

上記各実施形態では、弁機構部２５ａ，８１ａに設けた一対の爪部５２，８２を、押圧操作部２５ｂ，８１ｂに設けた爪係合穴５６，８３に係合することで、弁機構部２５ａ，８１ａと押圧操作部２５ｂ，８１ｂとをそれぞれ連結しているが、弁機構部と押圧操作部との連結構造は特に限定されず、任意の連結構造を用いることができる。 In each said embodiment, a valve mechanism part is engaged by engaging a pair of claw parts 52 and 82 provided in valve mechanism parts 25a and 81a with claw engagement holes 56 and 83 provided in press operation parts 25b and 81b. Although 25a, 81a and the press operation parts 25b, 81b are each connected, the connection structure of a valve mechanism part and a press operation part is not specifically limited, Arbitrary connection structures can be used.

上記実施形態では、キャップ２６のスカート部６６の弾性復元力により、連結プランジャ２５を遮断状態で維持しているが、例えば、蓋部６５と弁ガイド部材２４の先端との間にコイルバネ等を装着して、このコイルバネの付勢力により連結プランジャ２５を遮断状態で維持してもよい。 In the above embodiment, the coupling plunger 25 is maintained in the cut-off state by the elastic restoring force of the skirt portion 66 of the cap 26. For example, a coil spring or the like is mounted between the lid portion 65 and the tip of the valve guide member 24. Then, the coupling plunger 25 may be maintained in a cut-off state by the biasing force of the coil spring.

上記実施形態では、錐形弁部５１を有する連結プランジャ２５と、直管管路４１及び弁受け部４２を有する弁ガイド部材２４とを備えた吸引ボタンを例に挙げて説明を行ったが、弁部や弁ガイド部材の管路の形状は特に限定されず、各種形状の弁部を有する連結プランジャや各種形状の弁ガイド部材を備える吸引ボタンに本発明を適用することができる。 In the above embodiment, the description has been given by taking the suction button including the connection plunger 25 having the conical valve portion 51 and the valve guide member 24 having the straight pipe line 41 and the valve receiving portion 42 as an example. The shape of the conduits of the valve portion and the valve guide member is not particularly limited, and the present invention can be applied to a suction button including a connecting plunger having various shape valve portions and a valve guide member having various shapes.

上記各実施形態では、先端側シリンダ開口３５の付近で弁機構部２５ａ，８１ａと押圧操作部２５ｂ，８１ｂとがそれぞれ連結しているが、弁機構部と押圧操作部との軸方向長さを適宜変更して両者が先端側シリンダ開口３５の上方あるいは直管管路４１内で連結していてもよい。 In each of the above embodiments, the valve mechanism portions 25a and 81a and the pressing operation portions 25b and 81b are connected in the vicinity of the distal end side cylinder opening 35. However, the axial lengths of the valve mechanism portion and the pressing operation portion are set differently. They may be appropriately changed and both may be connected above the tip side cylinder opening 35 or in the straight pipe line 41.

上記実施形態では、気管に挿入する内視鏡１０に設けられた吸引ボタン１８を例に挙げて説明を行ったが、例えば大腸に挿入される大腸内視鏡等の各種内視鏡に設けられている吸引ＯＮ／ＯＦＦ切替用の吸引ボタンにも本発明を適用することができる。 In the above embodiment, the suction button 18 provided in the endoscope 10 to be inserted into the trachea has been described as an example. However, for example, it is provided in various endoscopes such as a large intestine endoscope inserted into the large intestine. The present invention can also be applied to a suction button for switching suction ON / OFF.

１０内視鏡
１７吸引通路
１８，８０吸引ボタン
２１負圧源通路
２４弁ガイド部材
２５，８１連結プランジャ
２５ａ，８１ａ弁機構部
２５ｂ，８１ｂ押圧操作部
２６キャップ
４５接続口
５２，８２一対の爪部
５６，８３爪係合穴
５８開口窓
７５通気穴 DESCRIPTION OF SYMBOLS 10 Endoscope 17 Suction passage 18, 80 Suction button 21 Negative pressure source passage 24 Valve guide member 25, 81 Connection plunger 25a, 81a Valve mechanism part 25b, 81b Press operation part 26 Cap 45 Connection port 52, 82 A pair of nail | claw part 56,83 Claw engagement hole 58 Open window 75 Ventilation hole

Claims

A suction passage that is provided in the operation portion of the endoscope and communicates with a suction opening that opens at a distal end of the endoscope insertion portion and a negative pressure source passage that is connected to a negative pressure source are connected to each other, and the negative pressure source In the endoscope suction button for switching communication / blocking between the passage and the suction passage,
A cylinder provided in the operation unit, one end of which is opened at a first cylinder opening that communicates with the suction passage, and the other end that is opened at a second cylinder opening that communicates with the outside of the operation unit. A cylinder in which a connection port leading to the negative pressure source passage is opened,
A main body shaft portion having a first tip portion inserted into the cylinder conduit from the first cylinder opening, and a valve mechanism portion having a valve portion provided at a first rear end portion of the main body shaft portion; A pressing operation portion at least partially protruding from the second cylinder opening and extending coaxially with the valve mechanism portion, a second rear end portion connected to the first tip portion, and a second receiving a pressing operation Ri Do from the pushing operation section having a tip portion, wherein at the time of non-pressing operation of the pressing element will cut-off state in which the communication between the suction passage and the negative pressure source passage by the valve unit, the pushing operation section A connecting plunger that releases a shut-off by the valve portion during a pressing operation and enters a communication state that connects the negative pressure source passage and the suction passage;
The portion on the first cylinder opening side with respect to the connection port of the cylinder pipe includes a conical pipe whose diameter gradually decreases from the other end toward the one end, and
The valve portion has a substantially conical shape that is larger in diameter than the diameter of the cone-shaped pipeline and extends along the inner wall of the cone-shaped pipeline, and contacts the inner wall of the cone-shaped pipeline in the shut-off state. In addition, the endoscope suction button is characterized in that it is separated from the inner wall of the conical duct in the communication state .

A claw formed at the tip of the first tip and extending long in the axial direction;
The suction button for an endoscope according to claim 1, further comprising a claw engagement hole formed at the second rear end portion and engaged with the claw portion.

The second rear end is located on the second cylinder opening when the connecting plunger is in the shut-off state,
Caps that are respectively connected to the tip of the second tip and the one end of the cylinder and surround the outer periphery of the pressing operation part, and a cap that has a vent hole communicating with the atmosphere on its side surface;
An opening window formed on a side surface of the second rear end portion and exposing a tip of the claw portion engaged with the claw engagement hole;
The endoscope suction button according to claim 2, further comprising a rotation restricting unit that restricts rotation between the coupling plunger and the cap so that the opening window substantially faces the vent hole. .

The negative pressure source passage communicates with the atmosphere through the connection port, the cylinder conduit, the second cylinder opening, and the vent hole when the connecting plunger is in the shut-off state. Item 5. The endoscope suction button according to Item 3.

The endoscope suction button according to claim 3 or 4, wherein the cap is made of an elastic material and maintains the connecting plunger in the shut-off state.

The claw parts are a pair of claw parts having a length equal to or longer than the axial length of the pressing operation part,
The claw engagement hole is formed so as to penetrate the pressing operation portion in the axial direction thereof, and has a pair of openings opened at a distal end surface of the second distal end portion, and is formed at an edge of the pair of openings. The suction button for an endoscope according to claim 2, wherein tips of the pair of claws are respectively hooked.

The tips of the pair of claws are hooked on the opening edge opposite to the opening edge on the side adjacent to the pair of openings,
7. The engagement between the pair of claw portions and the claw engagement holes is released when the tips of the pair of claw portions protruding from the pair of openings are operated. The endoscope suction button described.

The endoscope suction button according to any one of claims 1 to 7, wherein the negative pressure source is a suction pump.