JP2009045130A - Piping switching valve of endoscope - Google Patents

Piping switching valve of endoscope Download PDF

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JP2009045130A
JP2009045130A JP2007211776A JP2007211776A JP2009045130A JP 2009045130 A JP2009045130 A JP 2009045130A JP 2007211776 A JP2007211776 A JP 2007211776A JP 2007211776 A JP2007211776 A JP 2007211776A JP 2009045130 A JP2009045130 A JP 2009045130A
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cylinder
opening
suction
peripheral surface
inner peripheral
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JP4953977B2 (en
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Toshiyuki Hashiyama
俊之 橋山
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Hoya Corp
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Hoya Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide the piping switching valve of an endoscope with excellent durability, in which an abutting plug composed of a rubber material and directly pressed to the opening of a cylinder inner peripheral surface to close the opening is not easily worn out even when repeatedly used. <P>SOLUTION: In the piping switching valve of the endoscope in which the abutting plug 34 composed of an elastic rubber material and directly pressed to the opening 8b of the inner peripheral surface of a cylinder 11 to close the opening 8b is disposed inside a hole 33 with a bottom formed on the outer peripheral surface of a piston 14 disposed inside the cylinder 11 so as to be freely moved back and forth in the axial direction, the opening 8b of the inner peripheral surface of the cylinder 11 on which the abutting plug 34 is to be abutted is formed of an opening member 40 composed of the elastic rubber material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、内視鏡に設けられた配管の接続状態を切り換え操作するための内視鏡の配管切換弁に関する。   The present invention relates to a pipe switching valve for an endoscope for switching a connection state of pipes provided in the endoscope.

送気送水配管や吸引配管等の接続状態の切り換え操作を行うために内視鏡の操作部に設けられた配管切換弁は一般に、複数の配管が接続されたシリンダにピストンが軸線方向に進退自在に配置された構成になっていて、ピストンに形成された円周溝に装着されているOリング等によって配管間のシールをしている。   In general, the pipe switching valve provided in the operation section of the endoscope for switching the connection status of air / water supply pipes and suction pipes is generally free to advance and retract in the axial direction of a cylinder connected to multiple pipes. The pipes are sealed by an O-ring or the like attached to a circumferential groove formed in the piston.

しかし、挿入部の先端に膨縮自在なバルーンが取り付けられた内視鏡(例えば超音波内視鏡)等では、バルーンに連通する配管に対する切り換え機能が追加されるので、全部の配管間のシールをOリングで行うと配管切換弁の長さが長くなり過ぎてしまう。   However, in an endoscope (for example, an ultrasonic endoscope) in which a balloon that can be expanded and contracted is attached to the distal end of the insertion portion, a switching function for piping communicating with the balloon is added. If the O-ring is used, the length of the pipe switching valve becomes too long.

そこで、そのような内視鏡の配管切換弁では、バルーン内に連通する配管のシリンダ内周面の開口に直接押し付けられてその開口を塞ぐための弾力性のあるゴム材からなる当接栓が、ピストンの外周面に形成された有底孔内に配置されている(例えば、特許文献1)。
特開2007−14439
Therefore, in such a pipe switching valve for an endoscope, there is a contact plug made of a resilient rubber material that is pressed directly against the opening of the cylinder inner peripheral surface of the pipe communicating with the balloon to close the opening. These are disposed in a bottomed hole formed on the outer peripheral surface of the piston (for example, Patent Document 1).
JP2007-14439

上述のような従来の内視鏡の配管切換弁においては、弾力性のあるゴム材により形成された当接栓が、シリンダの内周面に押し付けられて弾性変形した状態で、ピストンの進退動作に伴ってシリンダの内周面に沿って移動し、シリンダ内周面の開口に当接する状態とシリンダの内周面に当接する状態との間を行き来する。   In the conventional endoscope pipe switching valve as described above, the advancing / retreating operation of the piston is performed in a state in which the contact plug formed by the elastic rubber material is pressed against the inner peripheral surface of the cylinder and elastically deformed. Accordingly, it moves along the inner peripheral surface of the cylinder, and moves back and forth between a state where it abuts on the opening of the cylinder inner peripheral surface and a state where it abuts on the inner peripheral surface of the cylinder.

その結果、繰り返し使用されているうちに当接栓がシリンダ内周面の開口の縁部で次第に削られて磨耗する。同様の磨耗は一般のOリング等の場合でも発生するが、当接栓の場合には、開口に直接押し付けられてその開口を一個の当接栓単独で塞ぐので、ごく僅かな磨耗でも流体漏れの発生につながり、例えばバルーン内から自然吸引をしてバルーンが萎んでしまうような不具合が発生する場合がある。   As a result, the contact plug is gradually scraped and worn at the edge of the opening on the inner peripheral surface of the cylinder while being repeatedly used. Similar wear occurs even in the case of ordinary O-rings, but in the case of a contact plug, it is pressed directly against the opening and the opening is closed by a single contact plug, so even a slight amount of wear may cause fluid leakage. For example, there may be a problem that the balloon is deflated by natural suction from within the balloon.

本発明は、シリンダ内周面の開口に直接押し付けられてその開口を塞ぐためのゴム材からなる当接栓が繰り返しの使用によっても磨耗し難くて、優れた耐久性を有する内視鏡の配管切換弁を提供することを目的とする。   The present invention is an endoscope pipe having excellent durability, because a contact plug made of a rubber material that is directly pressed against an opening on the inner peripheral surface of a cylinder and is not easily worn even after repeated use. An object is to provide a switching valve.

上記の目的を達成するため、本発明の内視鏡の配管切換弁は、複数の配管が接続されたシリンダの内周面部分に複数の配管の中の少なくとも一つが開口し、シリンダ内に軸線方向に進退自在に配置されたピストンの外周面に形成された有底孔内に、シリンダの内周面の開口に直接押し付けられて開口を塞ぐための弾力性のあるゴム材からなる当接栓が配置された内視鏡の配管切換弁において、当接栓が当接するシリンダの内周面の開口部を、弾力性のあるゴム材からなる開口部材で形成したものである。   In order to achieve the above object, an endoscope pipe switching valve according to the present invention is such that at least one of a plurality of pipes is opened in an inner peripheral surface portion of a cylinder to which a plurality of pipes are connected, and an axis line in the cylinder. A contact plug made of a resilient rubber material that is pressed directly against the opening on the inner peripheral surface of the cylinder and closed in the bottomed hole formed on the outer peripheral surface of the piston that can be moved forward and backward in the direction. In the endoscope pipe switching valve in which is provided, the opening on the inner peripheral surface of the cylinder with which the contact plug abuts is formed by an opening member made of a resilient rubber material.

なお、開口部材が、シリンダの内周面に凹んで形成された凹部内に配置されていてもよい。   Note that the opening member may be disposed in a recess formed by being recessed in the inner peripheral surface of the cylinder.

本発明によれば、当接栓が当接するシリンダの内周面の開口部を弾力性のあるゴム材からなる開口部材で形成したので、シリンダ内周面の開口に直接押し付けられてその開口を塞ぐためのゴム材からなる当接栓が繰り返しの使用によっても磨耗し難くて、優れた耐久性を得ることができる。   According to the present invention, since the opening portion of the inner peripheral surface of the cylinder with which the contact plug abuts is formed by the opening member made of the elastic rubber material, the opening is directly pressed against the opening of the inner peripheral surface of the cylinder. The contact plug made of a rubber material for closing is not easily worn even by repeated use, and excellent durability can be obtained.

複数の配管が接続されたシリンダの内周面部分に複数の配管の中の少なくとも一つが開口し、シリンダ内に軸線方向に進退自在に配置されたピストンの外周面に形成された有底孔内に、シリンダの内周面の開口に直接押し付けられて開口を塞ぐための弾力性のあるゴム材からなる当接栓が配置された内視鏡の配管切換弁において、当接栓が当接するシリンダの内周面の開口部を、弾力性のあるゴム材からなる開口部材で形成する。   In the bottomed hole formed on the outer peripheral surface of the piston, in which at least one of the plurality of pipes opens in the inner peripheral surface portion of the cylinder to which the plurality of pipes are connected, and is movable in the axial direction in the cylinder. In addition, in a pipe switching valve of an endoscope in which a contact plug made of an elastic rubber material is pressed directly against the opening on the inner peripheral surface of the cylinder to close the opening, the cylinder with which the contact plug contacts The opening of the inner peripheral surface is formed of an opening member made of a rubber material having elasticity.

以下、図面を参照して本発明の実施例を説明する。
図2は本発明が適用された超音波内視鏡を示しており、可撓性の挿入部1の基端に操作部2が連結され、挿入部1の先端には、軸線周りに超音波信号を発受信する例えばラジアル走査の超音波プローブ3が配置されると共に、前方を光学観察するための光学観察窓4が先端面に配置されている。
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 2 shows an ultrasonic endoscope to which the present invention is applied. An operation unit 2 is connected to a proximal end of a flexible insertion unit 1, and an ultrasonic wave is formed around the axis at the distal end of the insertion unit 1. For example, an ultrasonic probe 3 for radial scanning for transmitting and receiving signals is disposed, and an optical observation window 4 for optically observing the front is disposed on the distal end surface.

また、挿入部1の先端部分は、超音波プローブ3と被検部との間に超音波信号の伝達性の悪い空気層がないようにするために、脱気水等によって膨縮されるバルーン5が超音波プローブ3を囲む状態に取り付けられるようになっている。   In addition, the distal end portion of the insertion portion 1 is inflated and contracted by deaerated water or the like so that there is no air layer with poor ultrasonic signal transmission between the ultrasonic probe 3 and the test portion. 5 is attached to surround the ultrasonic probe 3.

挿入部1内には、鉗子や注射具等を挿脱するための鉗子チャンネル6が全長にわたって挿通配置されていて、その先端開口であるチャンネル吸引口6aが、バルーン5の外部に位置する挿入部1の先端面に配置されている。   A forceps channel 6 for inserting and removing forceps, an injection tool, and the like is inserted through the entire length in the insertion portion 1, and a channel suction port 6 a that is a distal end opening of the forceps channel 6 is located outside the balloon 5. 1 is disposed on the front end surface.

鉗子挿入口6bは挿入部1と操作部2との連結部付近に配置されており、また、鉗子チャンネル6に対してその基端部付近において連通接続されたチャンネル吸引配管7が、操作部2の上半部に配置された吸引操作弁10(配管切換弁)に接続されている。   The forceps insertion port 6b is disposed in the vicinity of the connection portion between the insertion portion 1 and the operation portion 2, and a channel suction pipe 7 connected to the forceps channel 6 in the vicinity of the proximal end thereof is connected to the operation portion 2. Is connected to a suction operation valve 10 (pipe switching valve) disposed in the upper half of the valve.

挿入部1内から操作部2内には、バルーン5内に充填された脱気水を吸引するためのバルーン吸引配管8等も挿通配置されていて、バルーン吸引配管8の先端開口であるバルーン吸引口8aは挿入部1の先端においてバルーン5の内側に開口し、バルーン吸引配管8の基端は操作部2内において吸引操作弁10に接続されている。9は、吸引操作弁10と図示されていない吸引源とを連通接続する吸引元配管である。   A balloon suction pipe 8 or the like for sucking deaerated water filled in the balloon 5 is also inserted from the insertion section 1 into the operation section 2, and a balloon suction that is a front end opening of the balloon suction pipe 8. The mouth 8a opens to the inside of the balloon 5 at the distal end of the insertion portion 1, and the proximal end of the balloon suction pipe 8 is connected to the suction operation valve 10 in the operation portion 2. A suction source pipe 9 connects the suction operation valve 10 and a suction source (not shown) in communication.

図1と図3は、吸引操作弁10の待機状態を示す縦断面図であり、図1は、図4におけるI−I断面図であって待機状態での配管切り換え状態を示し、図3は、図4におけるIII−III断面図であって、シリンダ11に対して吸引配管切換用ピストン14(請求項1のピストン)が軸線周りに回転するのを規制するための回転止め用突起25と係合溝26を含むものである。   1 and 3 are longitudinal sectional views showing a standby state of the suction operation valve 10. FIG. 1 is a cross-sectional view taken along the line II in FIG. 4, showing a pipe switching state in the standby state. 4 is a cross-sectional view taken along the line III-III in FIG. 4, and is associated with a rotation stop protrusion 25 for restricting the suction pipe switching piston 14 (piston of claim 1) from rotating about the axis with respect to the cylinder 11. The groove 26 is included.

図1と図3に示されるように、操作部2内に配置されたシリンダ11は、外方に向けて開口する状態に固定ナット12により操作部2に固定されている。13はシール用のOリングである。なお、弾力性があって押し潰された状態に装着されるシール部材の類の押し潰される前の状態が図示されている。   As shown in FIGS. 1 and 3, the cylinder 11 disposed in the operation unit 2 is fixed to the operation unit 2 by a fixing nut 12 so as to open outward. Reference numeral 13 denotes an O-ring for sealing. In addition, the state before being crushed is shown in the figure of a seal member that is mounted in a crushed state with elasticity.

有底の円筒状に形成されたシリンダ11は、奥寄りの半部の内径が口元寄りの半部の内径より細く形成されており、チャンネル吸引配管7の基端は、そのようなシリンダ11の底面部に開口接続されている。   The cylinder 11 formed in a cylindrical shape with a bottom is formed such that the inner diameter of the inner half near the back is narrower than the inner diameter of the half near the mouth, and the proximal end of the channel suction pipe 7 is An opening is connected to the bottom surface.

また、バルーン吸引配管8と吸引元配管9は、図3におけるIV−IV断面を図示する図4にも示されるように、軸線周り方向に位置をずらして、且つ吸引元配管9がバルーン吸引配管8より奥側(図3において下方)にある位置関係に、シリンダ11の口元寄りの部分の側面部に接続され、バルーン吸引配管8の基端開口8b(開口)と吸引元配管9の接続開口9aとが、各々シリンダ11の内周面に開口している。   Further, the balloon suction pipe 8 and the suction source pipe 9 are shifted in the direction around the axis as shown in FIG. 4 showing the IV-IV cross section in FIG. 8 is connected to the side surface of the portion near the mouth of the cylinder 11 in a positional relationship on the back side (downward in FIG. 3), and the connection opening between the proximal end opening 8b (opening) of the balloon suction pipe 8 and the suction source pipe 9 9a open to the inner peripheral surface of the cylinder 11, respectively.

図1と図3に示されるように、シリンダ11内に軸線方向に進退自在に嵌挿されたピストンは、シリンダ11に対して軸線方向に進退自在に内接する円筒状の吸引配管切換用ピストン14と、その吸引配管切換用ピストン14に対して軸線方向にスライド自在に内接する外気吸引切換用ピストン15とが同軸に配置された構造になっていて、外気吸引切換用ピストン15は、全長にわたって吸引配管切換用ピストン14の内周より小さな外径に形成されている。   As shown in FIGS. 1 and 3, the piston inserted into the cylinder 11 so as to advance and retract in the axial direction is a cylindrical suction pipe switching piston 14 that is inscribed in the cylinder 11 so as to advance and retract in the axial direction. And an outside air suction switching piston 15 that is slidably inscribed in the axial direction with respect to the suction pipe switching piston 14 are arranged coaxially. The outside air suction switching piston 15 is sucked over its entire length. The outer diameter of the pipe switching piston 14 is smaller than the inner diameter.

そして、吸引配管切換用ピストン14と外気吸引切換用ピストン15の各々の外径は、シリンダ11の奥寄りの半部(小径部)の内周面に外気吸引切換用ピストン15のみが内接し、シリンダ11の口元寄りの半部(太径部)の内周面に吸引配管切換用ピストン14のみが内接するように形成されている。   The outer diameter of each of the suction pipe switching piston 14 and the outside air suction switching piston 15 is such that only the outside air suction switching piston 15 is inscribed on the inner peripheral surface of the half (small diameter portion) near the back of the cylinder 11. Only the suction pipe switching piston 14 is inscribed on the inner peripheral surface of the half portion (large diameter portion) near the mouth of the cylinder 11.

吸引配管切換用ピストン14と外気吸引切換用ピストン15の頭部は、操作部2の外表面に開口するシリンダ11の口元から突出していて、外気吸引切換用ピストン15の頭部には、第1のバネ受け部材18と、図5の分解斜視図にも示される連結軸150を介して押し込み操作ボタン16が取り付けられている。   The heads of the suction pipe switching piston 14 and the outside air suction switching piston 15 protrude from the mouth of the cylinder 11 that opens to the outer surface of the operation unit 2. The push-in operation button 16 is attached via the spring receiving member 18 and the connecting shaft 150 also shown in the exploded perspective view of FIG.

吸引配管切換用ピストン14の頭部部分には、図6にも示されるように、フランジ管状に形成された第2のバネ受け部材19が螺合連結されており、第1のバネ受け部材18と第2のバネ受け部材19との間に装着された第1の圧縮コイルスプリング21によって、外気吸引切換用ピストン15が吸引配管切換用ピストン14から外方に飛び出す方向(図1及び図3において上方)に付勢されている。   As shown in FIG. 6, a second spring receiving member 19 formed in a flange shape is screwed to the head portion of the suction pipe switching piston 14, and the first spring receiving member 18. The first compression coil spring 21 mounted between the second spring receiving member 19 and the second spring receiving member 19 causes the outside air suction switching piston 15 to jump out of the suction pipe switching piston 14 (in FIGS. 1 and 3). (Upward).

ただし、吸引配管切換用ピストン14の内面の途中に形成された段部と外気吸引切換用ピストン15の外面の途中に形成された段部とが当接することにより、外気吸引切換用ピストン15が図1及び図3に示された状態より吸引配管切換用ピストン14から相対的に外方に飛び出せないように規制されている。   However, the step formed in the middle of the inner surface of the suction pipe switching piston 14 and the step formed in the middle of the outer surface of the outside air suction switching piston 15 come into contact with each other, so that the outside air suction switching piston 15 is shown in FIG. From the state shown in FIG. 1 and FIG. 3, the suction pipe switching piston 14 is restricted so as not to protrude relatively outward.

また、第1の圧縮コイルスプリング21が外部から見えないようにカバーをする第1のカバー筒17が、第1の圧縮コイルスプリング21によって第2のバネ受け部材19に押し付けられた状態に取り付けられている。   Further, the first cover cylinder 17 that covers the first compression coil spring 21 so as not to be seen from the outside is attached in a state of being pressed against the second spring receiving member 19 by the first compression coil spring 21. ing.

22は、第1の圧縮コイルスプリング21に比べて数倍大きなバネ定数に設定されている第2の圧縮コイルスプリングであり、第1の圧縮コイルスプリング21と直列の関係に配置されて、第2のバネ受け部材19を外方に付勢している。   Reference numeral 22 denotes a second compression coil spring which is set to a spring constant several times larger than that of the first compression coil spring 21, and is arranged in a series relationship with the first compression coil spring 21, and the second The spring receiving member 19 is urged outward.

第2の圧縮コイルスプリング22の基端側を受けるピストン止め環20Aは、吸引配管切換用ピストン14が所定状態以上にシリンダ11内から抜け出すのを阻止するストッパにもなっていて、第2の圧縮コイルスプリング22を外部から見えないようにするためのカバーの機能も有している。   The piston retaining ring 20A that receives the proximal end side of the second compression coil spring 22 also serves as a stopper that prevents the suction pipe switching piston 14 from slipping out of the cylinder 11 beyond a predetermined state. It also has a cover function for making the coil spring 22 invisible from the outside.

また、ピストン止め環20Aに一体的にライニングされた弾力性のあるプラスチック材等からなる係止環20Bの下端部の内爪部分が固定ナット12の外周鍔部に引っ掛かり係合し、それによって吸引配管切換用ピストン14、外気吸引切換用ピストン15及び押し込み操作ボタン16等を含むユニットをシリンダ11に固定している。   Further, the inner claw portion of the lower end portion of the locking ring 20B made of a resilient plastic material lined integrally with the piston locking ring 20A is hooked and engaged with the outer peripheral flange portion of the fixing nut 12, thereby sucking it. A unit including a pipe switching piston 14, an outside air suction switching piston 15, a push-in operation button 16, and the like is fixed to the cylinder 11.

したがって、係止環20Bを弾性変形させて固定ナット12との係合を解けば、押し込み操作ボタン16等と共に吸引配管切換用ピストン14や外気吸引切換用ピストン15をシリンダ11から外方に引き出すことができる。   Therefore, if the locking ring 20B is elastically deformed to release the engagement with the fixing nut 12, the suction pipe switching piston 14 and the outside air suction switching piston 15 are pulled out from the cylinder 11 together with the push-in operation button 16 and the like. Can do.

また、吸引配管切換用ピストン14と外気吸引切換用ピストン15とには、図1におけるVII−VII断面を図示する図7に示されるように、外気吸引切換用ピストン15の外面を180°対称位置で平らに削ぎ落とした平面部15aと、その平面部15aを緩く挟む状態に吸引配管切換用ピストン14の内面に形成された平面部14aとが互いに向かい合う状態に配置されており、その結果、吸引配管切換用ピストン14と外気吸引切換用ピストン15も、相対的に軸線方向には移動自在であるが、軸線周りに回転することはできない。   Further, the suction pipe switching piston 14 and the outside air suction switching piston 15 are arranged at 180 ° symmetrical positions on the outer surface of the outside air suction switching piston 15 as shown in FIG. 7 illustrating a section VII-VII in FIG. And the flat portion 15a formed on the inner surface of the suction pipe switching piston 14 in a state where the flat portion 15a is loosely sandwiched between the flat portion 15a and the flat portion 15a. The pipe switching piston 14 and the outside air suction switching piston 15 are also relatively movable in the axial direction, but cannot rotate around the axis.

そのような吸引配管切換用ピストン14には、図6にも示されるように、シリンダ11の口元寄りの部分の内周面に摺接するように吸引配管切換用ピストン14の外周面の中間部分に装着されたシール用のOリング27を挟んでその両側に、外位置側孔28と内位置側孔29とが各々側壁を貫通して形成されている。   As shown in FIG. 6, the suction pipe switching piston 14 has an intermediate portion on the outer peripheral surface of the suction pipe switching piston 14 so as to be in sliding contact with the inner peripheral surface of the portion near the mouth of the cylinder 11. An outer position side hole 28 and an inner position side hole 29 are formed on both sides of the mounted sealing O-ring 27 so as to penetrate the side walls.

また、シリンダ11の内周面と嵌合する吸引配管切換用ピストン14の奥側端部付近の外周面には、バルーン吸引配管8の基端開口8bのみを単独で塞ぐようにシリンダ11の内周面に摺接する弾力性のあるゴム材からなる当接栓34が、バルーン吸引配管8の基端開口8bに対向する位置に形成された円形の有底孔33内に、中央付近が少し出っ張った状態に嵌め込まれている。当接栓34は、直径がバルーン吸引配管8の基端開口8bより大きくて、吸引配管切換用ピストン14の直径の4分の1程度の大きさの円盤状又は円柱状のものである。   Further, the inner surface of the cylinder 11 is closed so that only the proximal end opening 8b of the balloon suction pipe 8 is closed on the outer peripheral surface near the rear end of the suction pipe switching piston 14 fitted to the inner peripheral surface of the cylinder 11. A contact plug 34 made of a resilient rubber material that is slidably contacted with the peripheral surface protrudes slightly in the vicinity of the center in a circular bottomed hole 33 formed at a position facing the base end opening 8 b of the balloon suction pipe 8. It is fitted in the state. The contact plug 34 has a diameter larger than that of the proximal end opening 8b of the balloon suction pipe 8 and is a disc or column having a size of about a quarter of the diameter of the suction pipe switching piston 14.

シリンダ11の内周面に向けられている当接栓34の外端面はシリンダ11の内周面の半径より小さな曲率半径の球面状に盛り上がった形状に形成されていて、当接栓34の中央部分は、吸引配管切換用ピストン14の外面より少し突出していて、シリンダ11の内周面で押し潰された状態に弾性変形してバルーン吸引配管8の基端開口8bを塞ぐ状態になる。当接栓34の周辺部分は、有底孔33内に潜っていて吸引配管切換用ピストン14の外周面より少し凹んだ位置にある。   The outer end surface of the contact plug 34 directed to the inner peripheral surface of the cylinder 11 is formed in a spherical shape having a curvature radius smaller than the radius of the inner peripheral surface of the cylinder 11, and the center of the contact plug 34 is formed. The portion protrudes slightly from the outer surface of the suction pipe switching piston 14, and is elastically deformed into a state of being crushed by the inner peripheral surface of the cylinder 11, thereby closing the proximal end opening 8 b of the balloon suction pipe 8. The peripheral portion of the contact plug 34 is in a position that is submerged in the bottomed hole 33 and slightly recessed from the outer peripheral surface of the suction pipe switching piston 14.

一方、当接栓34が当接するバルーン吸引配管8の基端開口8bは、シリンダ11の内周面に凹んで形成された凹部41内に嵌め込まれた弾力性のあるゴム材からなる開口部材40に形成されている。   On the other hand, the base end opening 8b of the balloon suction pipe 8 with which the contact plug 34 abuts is an opening member 40 made of a resilient rubber material that is fitted into a recess 41 that is recessed in the inner peripheral surface of the cylinder 11. Is formed.

開口部材40は、当接栓34と同程度の大きさで中央付近が少し外方に(即ち、当接栓34と当接する方に)丸みを付けて出っ張った円盤状又は円柱状に形成されており、図8に凹部41から分離した状態が示されているように、その中心軸線位置に形成された貫通孔がバルーン吸引配管8の基端開口8bになっている。   The opening member 40 is approximately the same size as the contact plug 34 and is formed in a disk shape or a cylindrical shape with a rounded and protruding portion near the center (that is, toward the contact with the contact plug 34). 8, the through hole formed at the center axis position is the base end opening 8 b of the balloon suction pipe 8, as shown in FIG.

当接栓34と並んで、流体の通路となる吸引路30が、図1及び図4等に示されるように、吸引配管切換用ピストン14の奥側端部付近の外面を部分的に削ぎ落として形成されており、そのような吸引路30は、吸引元配管9の接続開口9aに面する位置とそれに対して180°対称の位置とに形成されている。   Along with the contact plug 34, the suction passage 30 serving as a fluid passage partially scrapes off the outer surface near the back end of the suction pipe switching piston 14 as shown in FIGS. Such a suction path 30 is formed at a position facing the connection opening 9a of the suction source pipe 9 and a position 180 [deg.] Symmetrical to it.

ただし、図4に示されるように、吸引配管切換用ピストン14の当接栓34が取り付けられている位置に対して180°対称の裏側位置Aでは、吸引配管切換用ピストン14の外周面が吸引路30等によって切り欠かれることなくシリンダ11の内周面にピッタリと接している。   However, as shown in FIG. 4, the outer peripheral surface of the suction pipe switching piston 14 is sucked at the back side position A symmetrical 180 ° with respect to the position where the contact plug 34 of the suction pipe switching piston 14 is attached. It is in perfect contact with the inner peripheral surface of the cylinder 11 without being cut out by the path 30 or the like.

したがって、吸引配管切換用ピストン14とシリンダ11との間で押し潰されている当接栓34から生じる反発力によって吸引配管切換用ピストン14が裏側位置A方向に強く付勢されているものの、それによって吸引配管切換用ピストン14の軸線位置がずれてしまうことはなく、吸引配管切換用ピストン14が軸線方向にスムーズに進退する。   Therefore, although the suction pipe switching piston 14 is strongly urged in the direction of the rear side A by the repulsive force generated from the contact plug 34 crushed between the suction pipe switching piston 14 and the cylinder 11, As a result, the axial line position of the suction pipe switching piston 14 does not shift, and the suction pipe switching piston 14 smoothly moves back and forth in the axial direction.

図1に示されるように、外気吸引切換用ピストン15には、側面と奥側端面とに開口するチャンネル吸引連通孔31がL字状に形成されている。31aは奥側開口、31bは側面開口である。   As shown in FIG. 1, the outside air suction switching piston 15 is formed with an L-shaped channel suction communication hole 31 that opens to the side surface and the back end surface. 31a is a back side opening, and 31b is a side opening.

そして、外気吸引切換用ピストン15の外周面には、図5にも示されるように、奥側端部付近と、チャンネル吸引連通孔31の側面開口31bを挟んでその両側位置とに各々、シリンダ11の内周面に摺接するシール用のOリング35が装着されている。また、連結軸150の基部付近にもOリング36が装着されている。   As shown in FIG. 5, the outer air suction switching piston 15 has cylinders in the vicinity of the rear end and on both sides of the side opening 31 b of the channel suction communication hole 31. A sealing O-ring 35 slidably in contact with the inner peripheral surface of 11 is mounted. An O-ring 36 is also mounted near the base of the connecting shaft 150.

また、図3に示されるように、シリンダ11に対して吸引配管切換用ピストン14が軸線周りに回転するのを規制するための回転止め用突起25が、吸引配管切換用ピストン14の最先端位置(即ち、シリンダ11の奥側に最も潜る位置)の近傍の外周面に突設されている。   Further, as shown in FIG. 3, the rotation stop protrusion 25 for restricting the suction pipe switching piston 14 from rotating about the axis relative to the cylinder 11 is provided at the foremost position of the suction pipe switching piston 14. It protrudes from the outer peripheral surface in the vicinity of (i.e., the position most dive in the back side of the cylinder 11).

そして、回転止め用突起25と係合する係合溝26が、回転止め用突起25の移動範囲に対応してシリンダ11の内周面に軸線と平行方向に真っ直ぐに形成されている。その結果、吸引配管切換用ピストン14はシリンダ11に対して軸線方向には移動自在であるが、軸線周りに回転することはできない。   An engagement groove 26 that engages with the rotation-stop projection 25 is formed on the inner peripheral surface of the cylinder 11 so as to be straight in the direction parallel to the axis corresponding to the movement range of the rotation-stop projection 25. As a result, the suction pipe switching piston 14 is movable in the axial direction with respect to the cylinder 11, but cannot rotate around the axial line.

回転止め用突起25は吸引配管切換用ピストン14に固定的に埋設されていて、吸引配管切換用ピストン14の外周面から側方に突出する部分は球面状に形成されている。係合溝26の断面形状は、回転止め用突起25に対して一定の僅かな隙間ができる程度の円弧状に形成されている。したがって、吸引配管切換用ピストン14が軸線方向に進退動作する際に、軸線周り方向に回転力等が加わっても係合溝26との間の摺動抵抗が小さくスムーズに進退する。   The rotation stop projection 25 is fixedly embedded in the suction pipe switching piston 14, and a portion protruding laterally from the outer peripheral surface of the suction pipe switching piston 14 is formed in a spherical shape. The cross-sectional shape of the engagement groove 26 is formed in an arc shape that allows a certain slight gap to the rotation stop projection 25. Therefore, when the suction pipe switching piston 14 moves back and forth in the axial direction, the sliding resistance with the engagement groove 26 is small and smoothly moves back and forth even if a rotational force or the like is applied in the direction around the axis.

吸引配管切換用ピストン14とシリンダ11に対する回転止め用突起25と係合溝26の配置は、図3及び図4に示されるように、回転止め用突起25が当接栓34の位置よりごく僅かに口元寄りで当接栓34と干渉しない位置関係に配置され、係合溝26がバルーン吸引配管8の基端開口8bや吸引元配管9の接続開口9a等と干渉しない位置関係に配置されている。   As shown in FIGS. 3 and 4, the rotation stopper protrusion 25 and the engagement groove 26 are disposed slightly with respect to the suction pipe switching piston 14 and the cylinder 11. The engagement groove 26 is disposed in a positional relationship that does not interfere with the base end opening 8b of the balloon suction pipe 8, the connection opening 9a of the suction source pipe 9, and the like. Yes.

このように構成された実施例の内視鏡の配管切換弁は、図1及び図3に示される待機状態においては、吸引配管切換用ピストン14と外気吸引切換用ピストン15が第2の圧縮コイルスプリング22と第1の圧縮コイルスプリング21によって、各々最大限に外方に突出する状態に押し上げられている。   The pipe switching valve of the endoscope according to the embodiment configured as described above is configured such that the suction pipe switching piston 14 and the outside air suction switching piston 15 are the second compression coil in the standby state shown in FIGS. The springs 22 and the first compression coil springs 21 are pushed up to the maximum extent to project outward.

そして、外気が外位置側孔28を通って吸引配管切換用ピストン14内に入った後、内位置側孔29から吸引配管切換用ピストン14とシリンダ11との隙間へ出て、そこから吸引路30内を通過して吸引元配管9に吸引されている。チャンネル吸引配管7及びバルーン吸引配管8からの吸引は、Oリング35及び当接栓34によって阻止されている。   After the outside air passes through the outer position side hole 28 and enters the suction pipe switching piston 14, the outside air exits from the inner position side hole 29 to the gap between the suction pipe switching piston 14 and the cylinder 11, and from there the suction path It passes through the inside 30 and is sucked into the suction source pipe 9. Suction from the channel suction pipe 7 and the balloon suction pipe 8 is blocked by the O-ring 35 and the contact plug 34.

その状態から、指先で押し込み操作ボタン16を押し込み操作して、図9に示されるように、第1の圧縮コイルスプリング21が圧縮され終わって第2の圧縮コイルスプリング22も圧縮され始める位置に押し込み操作ボタン16が達すると、押し込み操作ボタン16を操作する指に大きな抵抗が作用し、その時に、外気吸引切換用ピストン15に形成されているチャンネル吸引連通孔31の側面開口31bが吸引元配管9の接続開口9aに対向する位置に来る。   From this state, the push-in operation button 16 is pushed in with the fingertip, and as shown in FIG. 9, the first compression coil spring 21 is compressed and the second compression coil spring 22 is pushed into a position where compression starts. When the operation button 16 arrives, a large resistance acts on the finger that operates the push-in operation button 16, and at that time, the side surface opening 31 b of the channel suction communication hole 31 formed in the outside air suction switching piston 15 opens the suction source pipe 9. It comes to the position facing the connection opening 9a.

その結果、チャンネル吸引配管7と吸引元配管9とがシリンダ11内とチャンネル吸引連通孔31とを介して連通し、挿入部1の先端のチャンネル吸引口6aから体内の汚液等が吸引源に吸引される。   As a result, the channel suction pipe 7 and the suction source pipe 9 communicate with each other via the inside of the cylinder 11 and the channel suction communication hole 31, and sewage and the like in the body from the channel suction port 6 a at the tip of the insertion portion 1 serve as a suction source. Sucked.

その状態においては、依然として吸引配管切換用ピストン14は移動しておらず、その状態で押し込み操作ボタン16から指を離せば元の待機状態に戻る。したがって、バルーン吸引配管8の基端開口8bを当接栓34で完全に塞いだ状態のままで、チャンネル吸引配管7からの吸引操作のみを行うことができる。   In this state, the suction pipe switching piston 14 is not yet moved, and if the finger is released from the push-in operation button 16 in this state, the original standby state is restored. Therefore, only the suction operation from the channel suction pipe 7 can be performed while the proximal end opening 8 b of the balloon suction pipe 8 is completely closed by the contact plug 34.

また、前述のように、シリンダ11と吸引配管切換用ピストン14との間は回転止め用突起25と係合溝26との係合により軸線周りの回転止めがなされ、吸引配管切換用ピストン14と外気吸引切換用ピストン15との間は平面部14a,15aどうしの係合により軸線周りの回転止めがなされていることにより、チャンネル吸引連通孔31の側面開口31bが常に正確に吸引元配管9の接続開口9aに対向するので、固形の吸引物等があっても吸引操作弁10内で詰まることなく確実に吸引元配管9に吸引排出される。   Further, as described above, the rotation between the cylinder 11 and the suction pipe switching piston 14 is stopped around the axis by the engagement of the rotation prevention projection 25 and the engagement groove 26, and the suction pipe switching piston 14 Since the rotation of the periphery of the axis line is stopped by engaging the flat portions 14a and 15a with the outside air suction switching piston 15, the side surface opening 31b of the channel suction communication hole 31 is always accurately connected to the suction source pipe 9. Since it opposes the connection opening 9a, even if there is a solid sucking substance or the like, it is surely sucked and discharged to the suction source pipe 9 without being clogged in the suction operation valve 10.

図9に示される状態からさらに指先に力を入れて押し込み操作ボタン16を押し込むと、図10に示されるように回転止め用突起25が係合溝26の奥側位置(図において下方)に摺動して、図11に示されるように、第1の圧縮コイルスプリング21に続いて第2の圧縮コイルスプリング22も圧縮され、外気吸引切換用ピストン15と共に吸引配管切換用ピストン14がシリンダ11内に押し込まれた状態になる。   When the push-in operation button 16 is pushed further from the state shown in FIG. 9 with the force applied to the fingertip, the anti-rotation protrusion 25 slides to the rear side position (downward in the figure) of the engagement groove 26 as shown in FIG. As shown in FIG. 11, the second compression coil spring 22 is also compressed following the first compression coil spring 21, and the suction pipe switching piston 14 together with the outside air suction switching piston 15 is placed in the cylinder 11. It will be in the state pushed into.

すると、バルーン吸引配管8の基端開口8bに対向する位置から奥側に当接栓34が移動すると同時に、チャンネル吸引連通孔31の側面開口31bが接続開口9aに対向する位置からシリンダ11の奥側半部内に退避して塞がれた状態になる。   Then, the contact plug 34 moves from the position facing the proximal end opening 8b of the balloon suction pipe 8 to the back side, and at the same time, the side opening 31b of the channel suction communication hole 31 faces the back of the cylinder 11 from the position facing the connection opening 9a. It will be in a state where it is retracted and closed in the side half.

その結果、バルーン吸引配管8の基端開口8bと吸引元配管9の接続開口9aとの間のみが、シリンダ11の内周面と吸引配管切換用ピストン14の外周面との間に形成された空間B及び吸引路30を経由して連通した状態になるので、バルーン5内の脱気水等が挿入部1の先端のバルーン吸引口8aから吸引源に吸引されてバルーン5を縮ませることができる。   As a result, only the base end opening 8b of the balloon suction pipe 8 and the connection opening 9a of the suction source pipe 9 are formed between the inner peripheral surface of the cylinder 11 and the outer peripheral surface of the suction pipe switching piston 14. Since the communication is established via the space B and the suction path 30, degassed water or the like in the balloon 5 may be sucked from the balloon suction port 8 a at the distal end of the insertion portion 1 to the suction source to contract the balloon 5. it can.

そして、押し込み操作ボタン16から指を離せば、図9に図示されるチャンネル吸引配管7からの吸引状態を経て図1及び図3に図示される待機状態に戻るが、このような動作の際に、当接栓34がバルーン吸引配管8の基端開口8bに当接する状態とシリンダ11の内周面に当接する状態との間を行き来する。   When the finger is released from the push-in operation button 16, the state returns to the standby state shown in FIGS. 1 and 3 through the suction state from the channel suction pipe 7 shown in FIG. The contact plug 34 goes back and forth between a state in which the contact plug 34 contacts the proximal end opening 8 b of the balloon suction pipe 8 and a state in which the contact plug 34 contacts the inner peripheral surface of the cylinder 11.

しかし、バルーン吸引配管8の基端開口8bが弾力性のあるゴム材からなる開口部材40に形成されているので、そのような動作が繰り返されても当接栓34(及び開口部材40)が従来に比べて磨耗しない。   However, since the base end opening 8b of the balloon suction pipe 8 is formed in the opening member 40 made of an elastic rubber material, the contact plug 34 (and the opening member 40) can be retained even if such an operation is repeated. It does not wear out compared to conventional products.

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、本発明を超音波内視鏡以外の一般の内視鏡に適用してもよく、送気送水操作弁その他の各種操作弁に適用することができる。   The present invention is not limited to the above-described embodiment. For example, the present invention may be applied to a general endoscope other than an ultrasonic endoscope, and an air / water supply operation valve and other various operation valves. Can be applied to.

本発明の実施例の内視鏡の配管切換弁における待機状態の縦断面図(図4におけるI−I断面図)である。It is a longitudinal cross-sectional view (II sectional drawing in FIG. 4) of the standby state in the piping switching valve of the endoscope of the Example of this invention. 本発明の実施例の超音波内視鏡の全体構成を示す側面図である。1 is a side view showing an overall configuration of an ultrasonic endoscope according to an embodiment of the present invention. 本発明の実施例の内視鏡の配管切換弁における待機状態の回転止め用突起を含む縦断面図(図4におけるIII−III断面図)である。It is a longitudinal cross-sectional view (III-III sectional drawing in FIG. 4) including the protrusion for rotation prevention in the standby state in the piping switching valve of the endoscope of the Example of this invention. 本発明の実施例の内視鏡の配管切換弁の図3におけるIV−IV断面図である。It is IV-IV sectional drawing in FIG. 3 of the piping switching valve of the endoscope of the Example of this invention. 本発明の実施例の内視鏡の配管切換弁の外気吸引切換用ピストンの分解斜視図である。It is a disassembled perspective view of the outside air suction switching piston of the pipe switching valve of the endoscope of the embodiment of the present invention. 本発明の実施例の内視鏡の配管切換弁の吸引配管切換用ピストンの分解斜視図である。It is a disassembled perspective view of the suction pipe switching piston of the pipe switching valve of the endoscope of the embodiment of the present invention. 本発明の実施例の内視鏡の配管切換弁の図1におけるVII−VII断面図である。It is VII-VII sectional drawing in FIG. 1 of the piping switching valve of the endoscope of the Example of this invention. 本発明の実施例の内視鏡の配管切換弁の開口部材がシリンダから外された状態の一部を切除して示す斜視図である。It is a perspective view which cuts off and shows a part of the state from which the opening member of the piping switching valve of the endoscope of the Example of this invention was removed from the cylinder. 本発明の実施例の内視鏡の配管切換弁においてチャンネル吸引配管から吸引される状態の縦断面図である。It is a longitudinal cross-sectional view of the state attracted | sucked from channel suction piping in the piping switching valve of the endoscope of the Example of this invention. 本発明の実施例の内視鏡の配管切換弁においてバルーン吸引配管から吸引される状態の回転止め用突起を含む縦断面図である。It is a longitudinal cross-sectional view containing the protrusion for rotation prevention of the state attracted | sucked from balloon suction piping in the piping switching valve of the endoscope of the Example of this invention. 本発明の実施例の内視鏡の配管切換弁においてバルーン吸引配管から吸引される状態の縦断面図である。It is a longitudinal cross-sectional view of the state attracted | sucked from balloon suction piping in the piping switching valve of the endoscope of the Example of this invention.

符号の説明Explanation of symbols

7 チャンネル吸引配管(配管)
8 バルーン吸引配管(配管)
8b 基端開口(開口)
9 吸引元配管(配管)
10 吸引操作弁(配管切換弁)
11 シリンダ
14 吸引配管切換用ピストン(ピストン)
33 有底孔
34 当接栓
40 開口部材
41 凹部
7 Channel suction piping (piping)
8 Balloon suction piping (piping)
8b Base end opening (opening)
9 Suction source piping (piping)
10 Suction operation valve (pipe switching valve)
11 Cylinder 14 Suction piping switching piston (piston)
33 Bottomed hole 34 Contact plug 40 Opening member 41 Recess

Claims (2)

複数の配管が接続されたシリンダの内周面部分に上記複数の配管の中の少なくとも一つが開口し、上記シリンダ内に軸線方向に進退自在に配置されたピストンの外周面に形成された有底孔内に、上記シリンダの内周面の開口に直接押し付けられて上記開口を塞ぐための弾力性のあるゴム材からなる当接栓が配置された内視鏡の配管切換弁において、
上記当接栓が当接する上記シリンダの内周面の開口部を、弾力性のあるゴム材からなる開口部材で形成したことを特徴とする内視鏡の配管切換弁。
A bottomed surface formed on an outer peripheral surface of a piston, in which at least one of the plurality of pipes is opened at an inner peripheral surface portion of a cylinder to which a plurality of pipes are connected, and is movable in the axial direction in the cylinder. In the endoscope pipe switching valve in which a contact plug made of a resilient rubber material is disposed in the hole and pressed directly against the opening on the inner peripheral surface of the cylinder to close the opening.
An endoscope pipe switching valve characterized in that an opening portion of an inner peripheral surface of the cylinder with which the contact plug abuts is formed of an opening member made of a resilient rubber material.
上記開口部材が、上記シリンダの内周面に凹んで形成された凹部内に配置されている請求項1記載の内視鏡の配管切換弁。   The pipe switching valve for an endoscope according to claim 1, wherein the opening member is disposed in a recess formed to be recessed in the inner peripheral surface of the cylinder.
JP2007211776A 2007-08-15 2007-08-15 Endoscope piping switching valve Expired - Fee Related JP4953977B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012101039A (en) * 2010-10-12 2012-05-31 Fujifilm Corp Conduit switching device for endoscope
US9161680B2 (en) 2013-11-26 2015-10-20 Bracco Diagnostics Inc. Disposable air/water valve for an endoscopic device
WO2015190412A1 (en) * 2014-06-13 2015-12-17 オリンパス株式会社 Fluid plug and insertion device
CN111511261A (en) * 2017-12-22 2020-08-07 奥林巴斯株式会社 Insertion device

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JPH1172061A (en) * 1997-06-30 1999-03-16 Unisia Jecs Corp Fuel pressurizing pump
JP2004236842A (en) * 2003-02-06 2004-08-26 Pentax Corp Suction operating device of ultrasonic endoscope

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1172061A (en) * 1997-06-30 1999-03-16 Unisia Jecs Corp Fuel pressurizing pump
JP2004236842A (en) * 2003-02-06 2004-08-26 Pentax Corp Suction operating device of ultrasonic endoscope

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012101039A (en) * 2010-10-12 2012-05-31 Fujifilm Corp Conduit switching device for endoscope
US9161680B2 (en) 2013-11-26 2015-10-20 Bracco Diagnostics Inc. Disposable air/water valve for an endoscopic device
WO2015190412A1 (en) * 2014-06-13 2015-12-17 オリンパス株式会社 Fluid plug and insertion device
JP5989267B2 (en) * 2014-06-13 2016-09-07 オリンパス株式会社 Fluid plug and insertion device
CN106659358A (en) * 2014-06-13 2017-05-10 奥林巴斯株式会社 Fluid plug and insertion device
US10271717B2 (en) 2014-06-13 2019-04-30 Olympus Corporation Fluid plug unit and insertion device
CN111511261A (en) * 2017-12-22 2020-08-07 奥林巴斯株式会社 Insertion device
CN111511261B (en) * 2017-12-22 2023-07-04 奥林巴斯株式会社 Insertion device

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