JP2007014439A - Suction valve for ultrasonic endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suction valve for an endoscope facilitating the assembling of a piston to a cylinder by facilitating the engagement between a detent projection for preventing the rotation of the piston relative to the cylinder and an engagement groove when assembling the piston detached from the cylinder after using the endoscope, washed and disinfected, to the cylinder again. <P>SOLUTION: This suction valve for the ultrasonic endoscope is so formed that the detect projection 25 regulating the rotation of the piston 14 for changing over a suction conduit around an axis relative to the cylinder 11 is projected to the outer circumferential face adjacent to the forefront of the piston 14 for changing over the suction conduit, and the engagement groove 26 to be engaged with the detent projection 25 is formed in the inner circumferential face of the cylinder 11 corresponding to the moving range of the detent projection 25. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a suction operation valve for an ultrasonic endoscope.

  In an ultrasonic endoscope, an inflatable balloon is generally attached to the distal end of the insertion section, and a balloon suction opening that opens inside the balloon and a channel suction opening that opens outside the balloon are provided at the distal end of the insertion section. A suction operation valve capable of switching between a suction operation from the balloon suction port and a suction operation from the channel suction port is disposed in the operation unit.

  Conventionally, such a suction operation valve is a combination of an operation valve that pushes an operation button and a switching lever that switches a pipe that acts on suction. However, this complicates the operation.

  Therefore, the operation button is pushed in two steps, and the operation button is pushed to the middle position to switch between the state of sucking outside air and the state of sucking from the channel suction port, and the operation button is further filled from the middle position. The state of suction from the channel suction port and the state of suction from the balloon suction port are switched by performing the push-in operation (for example, Patent Document 1).

  The suction from the channel suction port is performed relatively frequently during the endoscope operation, and the suction from the balloon suction port is performed only at the end of the ultrasonic observation. When the piston is pushed in, suction from the channel suction port is performed, and when the piston is further pushed from this state, suction from the balloon suction port is performed.

  However, in the suction valve of the conventional ultrasonic endoscope as described in Patent Document 1, two cylinders, a cylinder communicating with the channel suction port and a cylinder communicating with the balloon suction port, are arranged in parallel. In addition, pistons that move forward and backward by a common operation button are arranged in each cylinder, and two operation valve mechanisms divided into two axes are operated by one operation button, so the structure is extremely There are drawbacks such as being complicated and troublesome to assemble and at the same time prone to malfunction.

Therefore, the inventor of the present invention invented a structure in which a suction line switching piston is arranged in one cylinder, and the contents thereof have already been disclosed in a patent publication (Patent Document 2).
Patent No. 3017957 JP 2005-58547 A

  As in the invention described in Patent Document 2, as a suction operation valve for switching between a suction operation from a balloon suction port and a suction operation from a channel suction port, a suction line switching piston is provided in one cylinder. If the structure which arrange | positions is taken, it will be necessary to position so that a piston may not rotate within a cylinder.

  In the invention described in Patent Document 2, the rotation-preventing protrusion (26) for that purpose protrudes from the outer peripheral surface of the rear end portion of the piston (that is, the portion closest to the cylinder opening portion in the portion slidingly contacting the cylinder). Then, an engagement groove (37) that engages with the rotation stopper projection is formed on the inner peripheral surface of the cylinder corresponding to the movement range of the rotation stopper projection.

  However, in the structure of the invention described in Patent Document 2, when a piston that has been removed from the cylinder and cleaned and disinfected after use of the endoscope is assembled to the cylinder again, the rotation is stopped until the piston is inserted deeply into the cylinder. Since the protrusion for engagement does not engage with the engagement groove and the positional relationship between the two is difficult to understand, the piston may have to be rotated greatly when engaging the protrusion for rotation prevention with the engagement groove.

  Then, since a sealing O-ring or the like is sandwiched between the piston and the cylinder, the rotation operation is heavy and the alignment work is difficult, and the rubber O-ring may be damaged. In some cases, it is a heavy burden on the operator as a necessary work when handling each time after using the endoscope.

  In view of this, the present invention relates to the engagement between the anti-rotation protrusion and the engaging groove for stopping the rotation of the piston with respect to the cylinder when the piston removed from the cylinder and cleaned and disinfected after use of the endoscope is assembled to the cylinder again. An object of the present invention is to provide a suction operation valve for an ultrasonic endoscope which can be easily performed and a piston can be easily assembled to a cylinder.

  In order to achieve the above object, a suction operation valve for an ultrasonic endoscope according to the present invention has a balloon that is opened to the inside of a balloon with an inflatable balloon that is attached to the distal end of an insertion portion of the ultrasonic endoscope. A suction port and a channel suction port that opens to the outside of the balloon are provided at the distal end of the insertion portion, and the operation portion connected to the proximal end of the insertion portion sucks from the balloon suction port and sucks from the channel suction port. A suction operation valve for switching between states is arranged, and the suction operation valve includes a suction source line communicating with a suction source, a balloon suction line communicating with a balloon suction port, and a channel suction communicating with a channel suction port. When the cylinder is connected to the pipe line and moved in the axial direction in the cylinder by pushing, the balloon suction line communicates with the suction source pipe line and the channel suction. In a suction operation valve of an ultrasonic endoscope provided with a suction pipe switching piston for switching the state of communication between the paths, the suction pipe switching piston is restricted from rotating around the axis with respect to the cylinder. A protrusion for rotation prevention is provided on the outer peripheral surface near the foremost part of the suction line switching piston, and an engagement groove that engages with the protrusion for rotation prevention corresponds to the movement range of the rotation prevention protrusion. And formed on the inner peripheral surface of the cylinder.

  It should be noted that the portion that protrudes from the outer peripheral surface of the suction pipe switching piston of the rotation stop projection is formed in a spherical shape, and the operation is performed when the cross-sectional shape of the engaging groove is formed in an arc shape corresponding to the protruding portion of the piston. The engaging groove may be formed straight on the inner peripheral surface of the cylinder in a direction parallel to the axis.

  In addition, an outside air suction switching piston for switching between a state in which outside air communicates with the suction source conduit and a state in which one of the channel suction conduit or the balloon suction conduit communicates may be provided. The outside air suction switching piston may be disposed in a state in which it is slidably inscribed in the axial direction with respect to the suction pipe switching piston.

  A plurality of seal members that are in sliding contact with the inner peripheral surface of the cylinder are attached to the outer peripheral portions of the suction pipe switching piston and the outside air suction switching piston, and the suction pipe switching piston is pushed into the cylinder. In this case, it is preferable that the rotation-stopping projections start to engage with the engaging grooves before the plurality of seal members are in sliding contact with the inner peripheral surface of the cylinder.

  According to the present invention, the rotation prevention protrusion for restricting the suction line switching piston from rotating around the axis with respect to the cylinder is provided on the outer peripheral surface in the vicinity of the most distal portion of the suction line switching piston. Since the engagement groove that engages with the rotation stopper protrusion is formed on the inner peripheral surface of the cylinder corresponding to the movement range of the rotation stopper protrusion, it is removed from the cylinder after use of the endoscope and is cleaned and disinfected. When the assembled piston is reassembled into the cylinder, the engagement of the rotation-preventing projection for preventing rotation of the piston with respect to the cylinder and the engagement groove can be easily performed, and the piston can be easily assembled into the cylinder.

  An inflatable and inflatable balloon is attached to the distal end of the insertion portion of the ultrasonic endoscope, and a balloon suction port that opens inside the balloon and a channel suction port that opens to the outside of the balloon are provided at the distal end of the insertion portion. A suction operation valve for switching between a state of suction from the balloon suction port and a state of suction from the channel suction port is disposed on the operation unit connected to the proximal end of the insertion unit. Moves in the axial direction in the cylinder by pushing the cylinder connected to the suction source line communicating with the source, the balloon suction line communicating with the balloon suction port, and the channel suction line communicating with the channel suction port. And a suction line switching piston for switching between a state in which the balloon suction line communicates with the suction source line and a state in which the channel suction line communicates. In the suction operation valve of the ultrasonic endoscope, the anti-rotation protrusion for restricting the rotation of the suction pipe switching piston around the axis relative to the cylinder is provided at the forefront of the suction pipe switching piston. An engaging groove that protrudes from the outer peripheral surface in the vicinity of the portion and engages with the rotation-preventing protrusion is formed on the inner peripheral surface of the cylinder corresponding to the movement range of the rotation-preventing protrusion.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows an ultrasonic endoscope according to the present invention. An operation unit 2 is connected to a proximal end of a flexible insertion unit 1, and an ultrasonic signal is generated around the axis at the distal end of the insertion unit 1. An ultrasonic probe 3 for radial scanning to be received is disposed, and an optical observation window 4 for optically observing the front is disposed on the distal end surface.

  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.

  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.

  The forceps insertion port 6b is disposed in the vicinity of the connecting portion between the insertion portion 1 and the operation portion 2, and a channel suction conduit 7 connected to the forceps channel 6 in the vicinity of the proximal end thereof is provided in the operation portion. 2 is connected to a suction operation valve 10 arranged in the upper half of the second half.

  A balloon suction pipe 8 and the like for sucking deaerated water filled in the balloon 5 are also inserted in the insertion portion 1, and a balloon suction port 8 a that is a distal end opening of the balloon suction pipe 8 is provided. The distal end of the insertion portion 1 opens inside the balloon 5, and the proximal end of the balloon suction conduit 8 is connected to the suction operation valve 10 in the operation portion 2. Reference numeral 9 denotes a suction source pipe line that connects the suction operation valve 10 and a suction source (not shown) in communication.

  FIG. 3 is a longitudinal sectional view showing a standby state of the suction operation valve 10. However, as can be explained as much as possible in one drawing, cross-sections in different directions are appropriately combined as long as there is no hindrance and are shown in one drawing. Further, since the rotation stop protrusion 25 and the engagement groove 26 for restricting the suction line switching piston 14 from rotating about the axis with respect to the cylinder 11 are not shown in FIG. 3, the rotation stop is shown in FIG. A longitudinal sectional view in a standby state including the projection 25 and the engaging groove 26 is shown.

  As shown in FIG. 3 and FIG. 4, 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 each figure, the kind of seal member that is mounted in a crushed state with elasticity is shown in a state before being crushed.

  The cylinder 11 formed in a bottomed shape by adding another part to the bottom part is formed so that the inner diameter of the back half is narrower than the inner diameter of the half near the mouth, and the base end of the channel suction line 7 is Such a cylinder 11 is open-connected to the bottom surface portion (that is, the back half portion).

  Further, the base end opening 8b of the balloon suction line 8 and the connection opening 9a of the suction source line 9 are shifted in the direction around the axis as shown in FIG. 5 showing the VV cross section in FIG. In addition, the suction source pipe 9 is connected to the side surface of the portion near the mouth of the cylinder 11 in a positional relationship in which the suction source pipe 9 is located behind the balloon suction pipe 8.

  Returning to FIGS. 3 and 4, the piston inserted in the cylinder 11 so as to be movable back and forth in the axial direction is a cylindrical suction pipe switching piston 14 that is inscribed in the cylinder 11 so as to be movable back and forth in the axial direction. The outside air suction switching piston 15 is coaxially arranged with respect to the suction pipe switching piston 14 so as to be slidable in the axial direction, and the outside air suction switching piston 15 is sucked over the entire length. It is formed in a shape that does not protrude outward from the inner peripheral surface of the pipe switching piston 14.

  The outer diameter of each of the suction line switching piston 14 and the outside air suction switching piston 15 is such that only the outside air suction switching piston 15 is inscribed in the inner peripheral surface of the inner half of the cylinder 11 and the cylinder 11 Only the suction pipe switching piston 14 is inscribed on the inner peripheral surface of the half near the mouth.

  The heads of the suction line 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 operation button 16 is attached via one spring receiving member 18 and a connecting shaft 150 also shown in the exploded perspective view of FIG.

  As shown in FIG. 7, a second spring receiving member 19 formed in a flange shape is screwed to the head portion of the suction pipe switching piston 14. The first spring receiving member A direction in which the outside air suction switching piston 15 jumps out of the suction pipe switching piston 14 by the first compression coil spring 21 mounted between the first spring receiving member 18 and the second spring receiving member 19 (FIGS. 3 and FIG. 3). 4 is upwardly biased.

  However, the step formed in the middle of the inner surface of the suction line 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 From the state shown in FIG. 3 and FIG. 4, the suction pipe switching piston 14 is restricted so as not to protrude relatively outward.

  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.

  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.

  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 line switching piston 14 from coming out of the cylinder 11 beyond a predetermined state. It also has a cover function for making the compression coil spring 22 invisible from the outside.

  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 and an operation button 16 is fixed to the cylinder 11.

  Therefore, when the engagement ring 20B is elastically deformed to disengage the fixed nut 12, the suction line switching piston 14 and the outside air suction switching piston 15 are pulled out from the cylinder 11 together with the operation button 16 and the like. Can do. The engaging portion between the inner claw portion of the locking ring 20B and the outer peripheral flange portion of the fixing nut 12 is partially formed with a discontinuous portion in the circumferential direction, and the relative rotation around the axis is restricted. Has been.

  Further, the suction pipe switching piston 14 and the outside air suction switching piston 15 are symmetric with respect to the outer surface of the outside air suction switching piston 15 by 180 ° as shown in FIG. 8 illustrating a section VIII-VIII in FIG. The flat surface portion 15a scraped flat at the position and the flat surface portion 14a formed on the inner surface of the suction pipe switching piston 14 so as to loosely sandwich the flat surface portion 15a are arranged so as to face each other. The suction line switching piston 14 and the outside air suction switching piston 15 are also relatively movable in the axial direction, but cannot rotate around the axial line.

  As shown in FIG. 7, the suction pipe switching piston 14 has an intermediate portion between the outer peripheral surfaces 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 sealing O ring 27 attached to the portion so as to penetrate the side walls.

  Further, the inner peripheral surface of the cylinder 11 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 so as to close the proximal end opening 8b of the balloon suction pipe 8. A sealing lid 34 made of a resilient rubber material or the like that is in sliding contact with the surface is attached in a state of slightly protruding in a recess formed at a position facing the proximal end opening 8b of the balloon suction conduit 8.

  Along with that, the suction path 30 serving as a fluid passage is formed by partially scraping the outer surface near the back end of the suction pipe switching piston 14. The suction source pipe 9 is formed at a position facing the connection opening 9a and a position 180 [deg.] Symmetrical to the position.

  However, as shown in FIG. 5, the outer peripheral surface of the suction pipe switching piston 14 is located at a back side position A that is 180 ° symmetrical to the position where the sealing lid 34 of the suction pipe switching piston 14 is attached. Is in perfect contact with the inner peripheral surface of the cylinder 11 without being cut out by the suction passage 30 or the like.

  Therefore, although the suction line switching piston 14 is strongly urged in the direction of the back side A by the repulsive force generated from the sealing lid 34 crushed between the suction line switching piston 14 and the cylinder 11. As a result, the axial line position of the suction line switching piston 14 is not shifted, and the suction line switching piston 14 smoothly moves back and forth in the axial direction.

  As shown in FIGS. 3 and 4, 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. As shown in FIG. 6, the outer air suction switching piston 15 has cylinders in the vicinity of the back 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.

  As shown in FIG. 4, the suction line switching piston 14 with respect to the cylinder 11 is disposed on the outer peripheral surface in the vicinity of the foremost position of the suction line switching piston 14 (that is, the position most deeply dive in the cylinder 11). An anti-rotation protrusion 25 for restricting the rotation of the piston 14 around the axis is provided, and an engaging groove 26 that engages with the anti-rotation protrusion 25 corresponds to the movement range of the anti-rotation protrusion 25. Thus, the cylinder 11 is formed straight on the inner peripheral surface in the direction parallel to the axis. As a result, the suction line switching piston 14 is movable in the axial direction with respect to the cylinder 11, but cannot rotate around the axial line.

  The rotation stop projection 25 is fixedly embedded in the suction line switching piston 14, and a portion protruding laterally from the outer peripheral surface of the suction line 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 line switching piston 14 advances and retracts in the axial direction, the sliding resistance between the engaging groove 26 is small and smoothly advances and retracts even if a rotational force or the like is applied in the axial direction.

  As shown in FIGS. 4 and 5, the rotation stopping projection 25 and the engagement groove 26 are arranged with respect to the suction line switching piston 14 and the cylinder 11 so that the rotation stopping projection 25 is slightly located from the position of the sealing lid 34. The engagement groove 26 is disposed at a position that does not interfere with the proximal end opening 8b of the balloon suction conduit 8, the connection opening 9a of the suction source conduit 9, and the like. Yes.

  Since the rotation stop projection 25 is disposed in the vicinity of the foremost position of the suction pipe switching piston 14, the suction pipe switching piston 14 removed from the cylinder 11 as shown in FIG. When the cylinder 11 is inserted again, any of the sealing members (O-rings 27 and 35, sealing lid 34) attached to the outer peripheral surfaces of the suction line switching piston 14 and the outside air suction switching piston 15 are cylinders. 11 is not slidably contacted with the inner peripheral surface of the eleventh, and the rotation-stopping projection 25 starts to engage with the engaging groove 26.

  Therefore, even if the positional relationship between the rotation stop projection 25 and the engagement groove 26 does not match, the suction line switching piston 14 can be rotated around the axis line without resistance so that the rotation stop projection 25 can be easily formed into the engagement groove 26. The suction line switching piston 14 can be easily assembled to the cylinder 11 by being engaged.

  The suction operation valve of the ultrasonic endoscope according to the embodiment having the above-described configuration is such that the suction line switching piston 14 and the outside air suction switching piston 15 are the second in the standby state shown in FIGS. 3 and 4. The compression coil springs 22 and the first compression coil springs 21 are pushed up so as to protrude to the maximum extent.

  Then, after the outside air passes through the outer position side hole 28 and enters the suction pipe switching piston 14, it 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. It passes through the suction path 30 and is sucked into the suction source pipe line 9. Suction from the channel suction line 7 and the balloon suction line 8 is blocked by the O-ring 35 and the sealing lid 34.

  From this state, the operation button 16 is pushed in with the fingertip, and the operation button is moved to a position where the first compression coil spring 21 is compressed and the second compression coil spring 22 begins to be compressed as shown in FIG. When 16 reaches, a large resistance acts on the finger that operates the operation button 16, and at that time, the side opening 31 b of the channel suction communication hole 31 formed in the outside air suction switching piston 15 is connected to the suction source pipe line 9. It comes to a position facing the opening 9a.

  As a result, the channel suction line 7 and the suction source line 9 communicate with each other through the inside of the cylinder 11 and the channel suction communication hole 31, and sewage or the like in the body is sucked from the channel suction port 6 a at the tip of the insertion portion 1. Sucked into the source.

  In this state, the suction line switching piston 14 is not yet moved, and if the finger is released from the operation button 16 in this state, the original standby state is restored. Accordingly, it is possible to perform only the suction operation from the channel suction pipe 7 while the base end opening 8b of the balloon suction pipe 8 is completely closed by the sealing lid 34.

  Further, as described above, the rotation between the cylinder 11 and the suction line switching piston 14 is stopped around the axis by the engagement of the rotation preventing projection 25 and the engagement groove 26, and the suction line switching piston. 14 and the outside air suction switching piston 15 are prevented from rotating around the axis by the engagement of the flat portions 14a and 15a, so that the side opening 31b of the channel suction communication hole 31 is always accurately and accurately drawn. Since it opposes the connection opening 9 a of the passage 9, even if there is a solid suction material or the like, the suction operation valve 10 is surely sucked and discharged without being clogged in the suction operation valve 10.

  When the operation button 16 is pushed in with further force applied to the fingertip from the state shown in FIG. 9, the anti-rotation protrusion 25 slides to the back side position of the engagement groove 26 as shown in FIG. As shown in FIG. 2, the second compression coil spring 22 is also compressed following the first compression coil spring 21, and the suction line switching piston 14 is pushed into the cylinder 11 together with the outside air suction switching piston 15. become.

  As a result, the sealing lid 34 moves from the position facing the base 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 connection opening 9a from the position of the cylinder 11. It is in a state where it is retracted and closed in the back half.

  As a result, only the space between the proximal end opening 8b of the balloon suction line 8 and the connection opening 9a of the suction source line 9 is between the inner peripheral surface of the cylinder 11 and the outer peripheral surface of the suction line switching piston 14. Since the communication is established via the formed space B and the suction path 30, degassed water or the like in the balloon 5 is sucked from the balloon suction port 8 a at the tip of the insertion portion 1 to the suction source and the balloon 5 is contracted. When the finger is released from the operation button 16, the state returns to the standby state shown in FIGS. 3 and 4 through the suction state from the channel suction line 7 shown in FIG. 9.

  The present invention is not limited to the above embodiment. For example, the connection position of the channel suction conduit 7 and the balloon suction conduit 8 with respect to the cylinder 11 is reversed, and the operation button 16 is pushed to an intermediate position. Alternatively, the suction may be performed from the balloon suction conduit 8 and the suction may be performed from the channel suction conduit 7 when the operation button 16 is fully pushed.

It is a longitudinal cross-sectional view of the state in the middle of reattaching the suction line switching piston to the cylinder in the suction operation valve of the ultrasonic endoscope of the embodiment of the present invention. 1 is a side view showing an overall configuration of an ultrasonic endoscope according to an embodiment of the present invention. It is a longitudinal cross-sectional view of the standby state in the suction operation valve of the ultrasonic endoscope of the embodiment of the present invention. It is a longitudinal cross-sectional view including the protrusion for rotation prevention in the standby state in the suction operation valve of the ultrasonic endoscope of the embodiment of the present invention. It is VV sectional drawing in FIG. 4 of the suction operation valve of the ultrasonic endoscope of the Example of this invention. It is a disassembled perspective view of the outside air suction switching piston of the suction operation valve of the ultrasonic endoscope of the embodiment of the present invention. It is a disassembled perspective view of the suction line switching piston of the suction operation valve of the ultrasonic endoscope according to the embodiment of the present invention. It is VIII-VIII sectional drawing in FIG. 3 of the suction operation valve of the ultrasonic endoscope of the Example of this invention. It is a longitudinal cross-sectional view of the state sucked from the channel suction pipe in the suction operation valve of the ultrasonic endoscope of the embodiment of the present invention. It is a longitudinal cross-sectional view including the protrusion for rotation prevention in the state attracted | sucked from the balloon suction pipe | tube in the suction operation valve of the ultrasonic endoscope of the Example of this invention. It is a longitudinal cross-sectional view of the state sucked from the balloon suction conduit in the suction operation valve of the ultrasonic endoscope according to the embodiment of the present invention.

Explanation of symbols

5 Balloon 6a Channel suction port 7 Channel suction conduit 8 Balloon suction conduit 8a Balloon suction conduit 9 Suction source conduit 10 Suction operation valve 11 Cylinder 14 Suction conduit switching piston 15 Outside air suction switching piston 16 Operation button 25 Anti-rotation Projection 26 engaging groove

Claims (6)

An inflatable / deflatable balloon is attached to the distal end of the insertion portion of the ultrasonic endoscope, and a balloon suction port that opens inside the balloon and a channel suction port that opens to the outside of the balloon are at the distal end of the insertion portion. A suction operation valve for switching between a state of suction from the balloon suction port and a state of suction from the channel suction port is disposed in the operation unit connected to the proximal end of the insertion unit; The suction operation valve performs a pushing operation with a cylinder connected to a suction source line communicating with a suction source, a balloon suction line communicating with the balloon suction port, and a channel suction line communicating with the channel suction port. As a result, it moves in the axial direction within the cylinder, and the state where the balloon suction line communicates with the suction source line and the channel suction line communicate with each other. That state and the suction operated valve of the ultrasonic endoscope suction channel switching piston is provided for switching,
A rotation-preventing protrusion for restricting the suction line switching piston from rotating about the axis with respect to the cylinder protrudes from the outer peripheral surface in the vicinity of the most distal portion of the suction line switching piston, A suction operation valve for an ultrasonic endoscope, wherein an engagement groove that engages with the rotation-stopping projection is formed on an inner peripheral surface of the cylinder corresponding to a movement range of the rotation-stopping projection.   A portion of the rotation stop protrusion that protrudes from the outer peripheral surface of the suction line switching piston is formed in a spherical shape, and a cross-sectional shape of the engagement groove is formed in an arc shape corresponding to the protrusion portion of the piston. The suction operation valve for an ultrasonic endoscope according to claim 1.   The suction operation valve for an ultrasonic endoscope according to claim 1 or 2, wherein the engagement groove is formed straight on an inner peripheral surface of the cylinder in a direction parallel to the axis.   An outside air suction switching piston for switching between a state in which outside air communicates with the suction source line and a state in which one of the channel suction line or the balloon suction line communicates with each other. 2. A suction operation valve for an ultrasonic endoscope according to 2 or 3.   The suction operation valve for an ultrasonic endoscope according to claim 4, wherein the outside air suction switching piston is disposed in a state in which it is slidably inscribed in the axial direction with respect to the suction line switching piston.   A plurality of seal members slidably in contact with the inner peripheral surface of the cylinder are attached to the outer peripheral portions of the suction pipe switching piston and the outside air suction switching piston, and the suction pipe switching piston is placed in the cylinder. The ultrasonic endoscope according to claim 4 or 5, wherein when the push-in operation is performed, the rotation-stop projection starts to engage with the engagement groove before the plurality of seal members are in sliding contact with the inner peripheral surface of the cylinder. Mirror suction valve.

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