JP2012065766A - Suction button of endoscope - Google Patents

Abstract

A diameter of an internal pipe line in a plunger is increased.
A valve-shaped guide member 30 of a cylinder unit 24 has a conical shape that connects a first pipe 40 having a large diameter leading to a suction passage 17, a second pipe 41 having a small diameter, and both pipes 40, 41. The third pipe line 42 is provided. A connection port 45 communicating with the negative pressure source passage 21 is provided on the inner wall of the third pipeline 42. The valve guide member 30 is provided with a plunger 25 having an internal pipe line 60 and opening and closing the connection port 45. The valve guide member 30 is provided with a ventilation path 78 that connects a ventilation opening 76 that opens to a position facing the cap 26 and a passage opening 77 that opens in the negative pressure source passage 21. The cap 26 is elastically deformed by the pressing operation of the plunger 25 and the ventilation opening 76 is blocked by the inclined surface 74. When the pressing operation is released, the cap 26 is restored to the original shape and the ventilation opening 76 is opened. . There is no need to form an air passage in the plunger 25.
[Selection] Figure 2

Description

  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.

  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 mounted on 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.

  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 communicate with each other. To stop suction from the suction port.

  As shown in FIG. 12, such a suction button includes a cylinder 100 which is provided in an operation portion of an endoscope, has a distal end opened outside the operation portion and a rear end connected to a suction passage 99, and a tube of the cylinder 100. A valve receiving portion 102 provided in the passage 101, an opening in the middle of the conduit 101, a connection port 104 communicating with the negative pressure source passage 103, and a movably attached to the conduit 101, and a cylinder tip A main body shaft portion 107 having a shaft tip portion 106 protruding from the cylinder opening 105 on the side, a communication passage 108 formed on the outer peripheral surface of the main body shaft portion 107 along the axial direction, and a plunger 110 including a valve portion 109; It is well known that it has a vent hole 111 and is composed of a cap 112 that connects the tip of the plunger 110 and the tip of the cylinder 100 (see Patent Documents 1 and 2).

  In the suction button having the above-described configuration, when the shaft tip portion 106 is not pressed, the valve portion 109 abuts on the valve receiving portion 102 to block communication between the suction passage 99 and the negative pressure source passage 103. At this time, the connection port 104 communicates with the atmosphere via the communication path 108 and the vent hole 111. This is because, since the suction pump is always operating, if the negative pressure source passage 103 does not communicate with the atmosphere, the negative pressure suction force in the negative pressure source passage 103 increases, and the load on the suction pump increases accordingly. It is. For this reason, the increase in the load of the suction pump is suppressed by communicating the negative pressure source passage 103 with the atmosphere.

  On the other hand, when the shaft tip portion 106 is pushed into the cylinder opening 105 by a predetermined amount by the pressing operation, the valve portion 109 is separated from the valve receiving portion 102, so that the suction passage 99 and the negative pressure source passage 103 communicate with each other. In this case, various body fluids and solids sucked from the suction port flow from the suction passage 99 to the negative pressure source passage 103 through the clearance between the outer periphery of the plunger 110 and the inner wall of the pipe 101 and the communication passage 108 ( (Displayed with a one-dot chain line in the figure). At this time, since the gap and the communication path 108 are narrow, a large solid cannot pass through the pipe line 101.

  A suction button described in Patent Document 3 that can cope with such a problem is known, and a suction button as shown in FIG. 11 is also devised. Each of these devices forms an internal conduit through which the body fluid and solid matter are circulated by hollowing the inside of the plunger. The structure and operation of such a suction button will be described as follows.

  The internal pipe line 87 communicates a side opening 85 opened on the outer peripheral surface of the plunger 84 and a bottom opening 86 opened on the bottom surface. When the shaft tip portion 84a of the plunger 84 is pushed by a predetermined amount, the side surface opening 85 substantially faces the connection port 90. As a result, the body fluid or solid matter sucked from the suction port flows through the internal conduit 87 to the negative pressure source passage 21. Since this internal pipe line 87 can be made larger in diameter than the gaps and communication paths described above, it is possible to suck a large solid matter.

  Also in the suction button described in Patent Document 3 and FIG. 11, when the shaft tip portion 84a is not pressed, the negative pressure source passage 21 communicates with the atmosphere as in the suction buttons of Patent Documents 1 and 2 above. Therefore, an air passage 88 communicating with the air hole of the cap is formed along the axial direction on the outer peripheral surface of the plunger 84.

JP 2007-185276 A JP 2003-325442 A JP 2004-166944 A

  In the suction button described in Patent Document 3 and FIG. 11, it is necessary to form an air passage on the outer peripheral surface of the plunger in order to communicate the negative pressure source passage with the atmosphere. It will be regulated. As a result, in the suction button described in Patent Document 3 and FIG. 11, the size of the diameter of the internal conduit cannot be increased to the limit. Therefore, depending on the size of the solid matter sucked from the suction port, the internal conduit May not be able to pass.

  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 capable of further expanding the diameter of the internal conduit in the plunger.

  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 And a cylinder provided in the operation unit in the suction button of the endoscope for communicating the negative pressure source passage to the atmosphere or blocking the communication with the atmosphere and communicating with the suction passage. A cylinder unit having one end opened at a cylinder opening and the other end connected to the suction passage; and the negative pressure source passage connected to a connection port opened in the pipe of the cylinder; A main body shaft portion that is movably accommodated in a pipeline and has a shaft tip protruding from the cylinder opening, a valve portion provided at a shaft rear end portion of the main body shaft portion, and an opening at the bottom surface of the valve portion Bottom opening and side of main body shaft An internal conduit that communicates with the side opening that is open to the shaft, and when the shaft tip is not pressed, the position of the side opening relative to the connection port is the one end side of the cylinder And the valve portion closes the connection port to shut off the communication between the negative pressure source passage and the suction passage, and the shaft tip portion is located in the cylinder opening by a pressing operation. When the fixed amount is pushed in, the valve portion is shifted to the other end side of the cylinder to open the connection port, and the side surface opening moves substantially in front of the connection port, whereby the negative pressure source passage And a plunger that communicates with the suction passage, a passage opening provided in the cylinder unit that opens in the negative pressure source passage, and a peripheral opening that opens in a peripheral portion of the cylinder opening. Through When the plunger is in the shut-off state, a gap is formed between the passage and the shaft tip, and the peripheral opening is opened to open the negative pressure source through the vent passage. Opening and closing means for communicating the atmosphere with the atmosphere of the negative pressure source passage by making the communication passage communicate with the atmosphere and closing the periphery opening by pressing the peripheral opening when the plunger is in a communicating state; It is characterized by providing.

  It is preferable that a substantially annular convex portion is formed on the peripheral edge of the peripheral opening so as to surround the peripheral opening. Moreover, it is preferable to provide the biasing means which maintains the said plunger in the said interruption | blocking state.

  The biasing unit has a lid portion connected to the shaft tip portion, and a substantially cylindrical shape surrounding the lid portion and the outer periphery of the shaft tip portion, and a skirt portion connected to the peripheral portion is integrally formed. The cap is made of an elastic material, and the cap is elastically deformed by compressing the skirt portion between the lid portion and the peripheral portion when the shaft tip portion is pushed into the cylinder opening. It is preferable that the skirt portion is restored to the original shape when the pressing operation is released.

  The opening / closing means is an inclined surface formed on a facing surface of the skirt portion facing the peripheral portion and on a portion facing the peripheral opening, and the inclined surface is when the plunger is in the blocking state. It is preferable that a gap is formed between the peripheral opening and the peripheral opening when the plunger is in the communicating state by elastic deformation of the skirt portion.

  It is preferable that the inclined surface is inclined so as to gradually move away from the peripheral portion as it goes from the inside to the outside of the skirt portion. Further, it is preferable that the skirt portion is elastically deformed to expand in the radial direction of the plunger and contract in the axial direction when the shaft tip portion is pushed into the cylinder opening.

  The predetermined amount is preferably a push amount until the lid portion comes into contact with the cylinder when the shaft tip portion is pushed into the cylinder opening and further push is restricted. Further, it is preferable that the center of the opening in the passage and the center of the peripheral opening are on a common straight line parallel to the axial direction of the plunger, and the air passage is formed in a substantially straight pipe shape. In addition, it is preferable that a rotation restricting unit that restricts rotation between the plunger and the cylinder is provided so that the side opening is substantially opposed to the connection port in the communication state.

  The suction button of the endoscope of the present invention is provided with a ventilation path in the cylinder unit that connects the passage opening in the negative pressure source passage leading to the negative pressure source and the peripheral opening opened in the peripheral portion of the cylinder opening, Since the negative pressure source passage is communicated / blocked with the atmosphere by opening / closing the peripheral opening by the opening / closing means provided at the tip of the plunger shaft, a passage for air communication is provided on the outer peripheral surface of the plunger as in the conventional device. No need to form. Thereby, the diameter of the internal pipe line for suction formed in the plunger can be increased as much as possible.

It is the schematic of the suction mechanism of an endoscope. It is sectional drawing of a suction button at the time of press release. It is sectional drawing of a suction button at the time of suction operation. (A) is sectional drawing of a valve guide member, (B) is a perspective view of a valve guide member. (A), (B) is a perspective view of a plunger. It is sectional drawing of a cap. It is the perspective view which looked at the cap from the bottom. It is sectional drawing to which the ventilation path was expanded. (A) is sectional drawing of the suction button when switching a plunger to the interruption | blocking state, (B) is an expanded sectional view which expanded the ventilation path in (A). (A) is sectional drawing of the suction button when a plunger is switched to a communication state, (B) is an expanded sectional view which expanded the ventilation path in (A). It is explanatory drawing for demonstrating the comparative example by which the internal pipeline and the ventilation path are formed in the plunger. It is sectional drawing of the suction button in which the ventilation path is formed in the outer peripheral surface of a plunger.

  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).

  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. is doing. The forceps inlet 16 is closed by a forceps plug (not shown) except when the treatment tool is inserted.

  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.

  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.

  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 button 18 allows the negative pressure source passage 21 to communicate with the atmosphere when communication between the passages 17 and 21 is interrupted, and the suction button 18 communicates with the negative pressure source passage 21 when both passages 17 and 21 are communicated. Block communication with the atmosphere. The suction pump 20 always performs suction during the endoscopic examination.

  In FIG. 2 showing a state at the time of releasing the pressure and FIG. 3 showing a state at the time of the pressing operation, the suction button 18 is roughly divided into a cylinder unit 24 fixed to the operation unit 12 and accommodated in the cylinder unit 24. The plunger 25 includes a cylinder unit 24 and a cap 26 that connects the plunger 25.

  The cylinder unit 24 includes a substantially tubular valve casing 29 fixed to the casing 28 of the operation unit 12 and a substantially tubular valve guide member 30 connected to the valve casing 29. 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.

  The valve casing 29 is fixed to the casing 28 with a leading end projecting outside the casing 28 and a rear end projecting inside the casing 28. A pipe line 31 extending in the axial direction is formed in the valve casing 29. A suction connection port 32 connected to the suction passage 17 is provided at the rear end portion of the valve casing 29, and the pipe line 31 and the suction passage 17 communicate with each other through the suction connection port 32. A valve guide member 30 is connected to the opening on the distal end side of the conduit 31.

  The valve guide member 30 has a substantially cylindrical insertion portion 34 provided at the rear end thereof fitted and connected to the opening on the distal end side of the valve casing 29, and has a conduit concentric with the conduit 31. is doing. A cylinder opening 35 (see FIGS. 4A and 4B) for projecting the shaft tip of the plunger 25 is formed at the tip of the valve guide member 30.

  A cylindrical portion 37 connected to the cap 26 is provided on an end face (hereinafter referred to as a cylinder end face, see FIG. 4) 30a at the tip of the cylinder. The above-described cylinder opening 35 is opened on the tip surface 37a of the cylindrical portion 37 (hereinafter referred to as a tube tip surface, see FIG. 4). A flange 38 is formed on the outer peripheral surface of the tip of the cylindrical portion 37. A part of the flange 38 is cut out in a planar shape to form a first cap rotation stop surface 38a (see FIG. 4B, rotation restricting means) used to stop rotation with the cap 26. Yes. Further, a substantially annular cylinder cap mounting groove 39 (see FIG. 4A) to which the cap 26 is connected is formed by the bottom surface of the flange 38, the outer peripheral surface of the cylindrical portion 37, and the cylinder end surface 30a.

  As shown in FIG. 4 (A), in the valve guide member 30, a first conduit 40 connected to the suction passage 17 via a conduit 31 and the like and extending long in parallel to the conduit 31, The first pipe 40 extends coaxially with the first pipe 40 at the front end side, and the front end is released as the cylinder opening 35 described above, and the second pipe 41 having a smaller diameter than the first pipe 40, A substantially conical third pipe 42 that connects the rear end of the two pipes 41 and the tip of the first pipe 40 is provided.

  As shown in FIG. 4B, a connection pipe 44 connected to the negative pressure source passage 21 is provided in a portion of the valve guide member 30 that is located on the side of the third pipeline 42. The connection pipe 44 extends long in a direction substantially orthogonal to the first to third pipelines 40 to 42 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 third pipeline 42.

  2 and 3, the plunger 25 is accommodated in the valve guide member 30 so as to be movable in the axial direction. The plunger 25 is connected to the suction passage 17 and the negative pressure source passage 21 by pressing operation or release. Switch off. The plunger 25 includes a substantially cylindrical body shaft portion 52 that extends long in the axial direction of each of the conduits 40 to 42 of the valve guide member 30, a substantially cone-shaped valve portion (hereinafter referred to as a cone-shaped valve portion) 53, and Are integrally formed. The main body shaft portion 52 is attached to the second conduit 41 so as to be movable in the axial direction, and the shaft tip portion 52 a protrudes from the cylinder opening 35.

  A substantially annular plunger cap mounting groove 54 for connecting the cap 26 is formed on the outer periphery of the shaft tip 52a (see FIGS. 5A and 5B). Further, a second cap rotation-stop surface used for rotation prevention with the cap 26 is formed by cutting out a part of the shaft tip portion 52a on the tip side of the plunger cap mounting groove 54 in a flat shape. 55 (see FIG. 5B, rotation restricting means) is formed. Furthermore, the tip of the shaft tip 52a is a pressing operation surface 56 that receives a pressing operation.

  The conical valve portion 53 is provided at the shaft rear end portion 52 b of the main body shaft portion 52, and the outer peripheral wall has a shape along the inner wall of the third pipeline 42. The conical valve part 53 moves in the second pipe line 41 and the third pipe line 42 according to the movement of the main body shaft part 52.

  When the plunger 25 is released from being pressed, the conical valve portion 53 abuts against the inner wall of the third pipe 42 and closes the connection port 45, thereby blocking communication between the suction passage 17 and the negative pressure source passage 21. become. In addition, when the shaft tip 52a of the plunger 25 is pushed into the cylinder opening 35 by a pressing operation by a predetermined amount, the conical valve portion 53 moves away from the inner wall of the third conduit 42 and opens the connection port 45. As a result, the suction passage 17 and the negative pressure source passage 21 communicate with each other. Here, the predetermined amount is, for example, an amount of pushing until the cap 26 comes into contact with the cylinder tip surface 37a and further pushing is restricted.

  As shown in FIGS. 5A and 5B, the plunger 25 communicates with a side surface opening 58 opened on the side surface of the main body shaft portion 52 and a bottom surface opening 59 opened on the bottom surface of the conical valve portion 53. An internal conduit 60 is provided. The side opening 58 is provided in a portion located substantially in front of the connection port 45 when the plunger 25 is in a communicating state. The internal conduit 60 guides various body fluids and solids flowing into the bottom surface opening 59 to the side surface opening 58 when the plunger 25 is in a communicating state. The diameter of the internal pipe line 60 is constant in the main body shaft portion 52, but gradually increases in the conical valve portion 53 as it approaches the bottom surface opening 59.

  2 and 3, the cap 26 is made of an elastic material such as rubber. The cap 26 has a substantially disc-shaped lid 62 connected to the tip of the shaft tip 52a, and a substantially cylindrical shape surrounding the lid 62, the shaft tip 52a, and the tip of the valve guide member 30. A skirt 63 connected to the tip of the valve guide member 30 is integrally formed.

  As shown in FIG. 6, a through hole 65 through which the plunger 25 passes is formed in the center of the lid portion 62. The through-hole 65 is open on the upper surface of the lid 62, and a fitting hole 66 that fits the tip of the shaft tip 52 a (tip side of the plunger cap mounting groove 54), and the fitting hole 66. An insertion hole 67 that penetrates the bottom surface and the bottom surface of the lid portion 62 and through which the portion for forming the plunger cap attachment groove 54 in the shaft tip portion 52 a is inserted is formed.

  A substantially planar plunger rotation stop surface (rotation restricting means) 69 that abuts against the second cap rotation stop surface 55 of the shaft tip 52 a is formed on the side wall surface of the fitting hole 66. Thereby, rotation of the plunger 25 and the cap 26 is restricted. Further, the first annular convex portion 70 constituting the inner wall of the insertion hole 67 in the lid portion 62 is fitted into the plunger cap mounting groove 54 of the shaft tip portion 52a. Thereby, the cover part 62 and the axial front-end | tip part 52a connect.

  The front end portion of the skirt portion 63 is integrated with the outer periphery of the lid portion 62, and a second annular convex portion 71 that protrudes toward the inner side is provided at the rear end portion. The second annular convex portion 71 is fitted in the cylinder cap mounting groove 39. Thereby, the cap 26 and the valve guide member 30 are connected.

  A flange fitting hole 72 into which the flange 38 is fitted is formed on the upper surface of the second annular convex portion 71 by notching the peripheral edge of the opening. On the inner wall of the flange fitting hole 72, a substantially planar guide member rotation stop surface (rotation restricting means) 73 that contacts the first cap rotation stop surface 38a of the flange 38 is formed. Thereby, the rotation of the valve guide member 30 and the cap 26 is restricted. Furthermore, the rotation of the valve guide member 30 and the plunger 25 is indirectly restricted via the cap 26. By both of these indirect rotation restrictions, the side surface opening 58 of the plunger 25 in the communication state can be made substantially opposite to the connection port 45.

  As shown in FIG. 7, a part of the outer peripheral portion is cut off on the facing surface 71a of the second annular convex portion 71 facing the cylinder end surface 30a (see FIG. 4) corresponding to the peripheral portion of the cylinder opening of the present invention. An inclined surface (opening opening / closing means) 74 is formed by lacking. The inclined surface 74 is inclined so as to gradually move away from the cylinder end surface 30a from the inner periphery to the outer periphery of the skirt portion 63.

  2 and 3, the cap 26 biases the plunger 25 upward in the drawing, thereby maintaining the plunger 25 in a blocked state. The lid portion 62 moves toward the cylindrical portion 37 when the shaft tip portion 52a is pushed into the cylinder opening 35 by a pressing operation.

  The skirt portion 63 expands in the radial direction of the plunger 25 and contracts in the axial direction (hereinafter referred to as elastic deformation as appropriate) as the lid portion 62 is moved by the pressing operation. The elastically deformed skirt portion 63 is restored to its original shape by an elastic restoring force when the pressing operation is released.

  When the skirt portion 63 is not elastically deformed, the inclined surface 74 of the second annular convex portion 71 forms a gap S (see FIG. 9B) with the cylinder end surface 30a. Further, the inclined surface 74 is in pressure contact with the cylinder end surface 30a when the skirt portion 63 is elastically deformed.

  As shown in FIG. 8, the valve guide member 30 includes a ventilation opening (peripheral opening) 76 opened on the cylinder end surface 30 a and at a position facing the inclined surface 74 of the cap 26, and a negative pressure source of the connection pipe 44. An air passage 78 is provided for connecting the passage opening 77 opened to the passage 21. Since the ventilation opening 76 and the passage opening 77 are opened on a common straight line A parallel to the axial direction of the plunger 25, the ventilation path 78 has a substantially straight pipe shape.

  The ventilation opening 76 is opened and closed by the inclined surface 74, and opens to the atmosphere through the gap S when not covered by the inclined surface 74. The air passage 78 allows the negative pressure source passage 21 to communicate with the atmosphere when the air opening 76 is opened. Further, an annular convex portion 79 is formed on the peripheral edge portion of the ventilation opening 76 so as to surround the ventilation opening 76.

  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 this time, in a normal time when no suction is performed, as shown in FIG. 9A, the plunger 25 is maintained in a shut-off state by the cap 26, so that the outer peripheral wall of the conical valve portion 53 is the third pipe line 42. It will be in the state pressed against the inner wall. Since the outer peripheral wall of the conical valve portion 53 is shaped to fit the inner wall of the third pipe 42, the outer peripheral wall is in close contact with the peripheral edge of the connection port 45 without a gap. Thereby, the communication between the negative pressure source passage 21 and the suction passage 17 is blocked, and the suction from the suction port 15 is stopped.

  As shown in FIG. 9B, when the plunger 25 is in the shut-off state, the skirt portion 63 of the cap 26 is not elastically deformed, and the second annular convex portion 71 is pressed toward the cylinder end surface 30a. No. For this reason, the inclined surface 74 of the second annular convex portion 71 is not in pressure contact with the ventilation opening 76 or the cylinder end surface 30a, and a gap S is formed between them, so that the ventilation path 78 is opened. ing. As a result, the negative pressure source passage 21 communicates with the atmosphere as indicated by the arrow in FIG. 9A, and therefore the load of the suction pump 20 is maintained even when the connection port 45 is blocked by the conical valve portion 53. Increase is suppressed.

  When suction is performed, the pressing operation surface 56 is pressed and the shaft tip 52 a is pushed into the cylinder opening 35 against the elastic force of the cap 26 as shown in FIG. Thereby, the lid 62 moves together with the shaft tip 52a toward the cylindrical portion 37, and the skirt 63 is compressed between the lid 62 and the cylinder end surface 30a to expand and contract as described above. Deform. When the shaft tip 52a is pushed in until the lid 62 comes into contact with the tube tip surface 37a, the plunger 25 is switched from the shut-off state to the communication state, and the conical valve portion 53 is separated from the inner wall of the third conduit 42. Thus, the connection port 45 is opened.

  As shown in FIG. 10B, when the skirt portion 63 is elastically deformed, the second annular convex portion 71 is pressed toward the cylinder end surface 30a. As a result, the second annular convex portion 71 and its inclined surface 74 are elastically deformed, and the inclined surface 74 comes into pressure contact with the ventilation opening 76 and the cylinder end surface 30a. At this time, since the ventilation opening 76 is opened at a position one step higher than the cylinder end surface 30a by the annular convex portion 79, the inclined surface 74 is more closely attached to the ventilation opening 76 than when opening on the cylinder end surface 30a. It becomes easy. For this reason, the ventilation opening 76 can be reliably closed by the inclined surface 74. As a result, the communication between the negative pressure source passage 21 and the atmosphere is blocked as indicated by the one-dot chain line in FIG. 10A, and the negative pressure suction force in the negative pressure source passage 21 increases.

  When the connection port 45 is opened, the negative pressure source passage 21 and the suction passage 17 communicate with each other, whereby various body fluids and solids (hereinafter referred to as a suction product) are sucked from the suction port 15. The suctioned material passes through the suction passage 17, the suction connection port 32, and the pipe line 31 and flows into the first pipe line 40 of the valve guide member 30, and then passes through the internal pipe line 60 to be negative pressure from the connection port 45. It flows into the source passage 21.

  When stopping the suction, the pressing operation on the pressing operation surface 56 is released. By releasing the pressing operation, the skirt portion 63 is restored to the original shape by the elastic restoring force, and thus the lid portion 62 and the plunger 25 are pulled up. Accordingly, since the plunger 25 is switched from the communication state to the cutoff state, the connection port 45 is blocked by the outer peripheral wall of the conical valve portion 53 as described above with reference to FIG. Communication between the passage 21 and the suction passage 17 is blocked, and suction from the suction port 15 is stopped. Further, as described above with reference to FIG. 9B, the skirt portion 63 is restored to the original shape, so that a gap S is formed between the inclined surface 74 and the ventilation opening 76, and the negative pressure source The passage 21 communicates with the atmosphere.

  Hereinafter, when performing suction, the plunger 25 is switched to the communicating state by a pressing operation, and conversely, when stopping the suction, the pressing operation is canceled and the plunger 25 is switched to the shut-off state. At this time, as in the conventional example described with reference to FIG. 12 described above, as much as possible in the plunger 25 without providing a suction passage in a narrow gap between the inner wall of the valve guide member and the outer periphery of the plunger. Since the internal pipe line 60 having the wide diameter L1 is formed, the diameter of the passage through which the suction object passes in the cylinder unit 24 is widened. As a result, even a large solid suction can pass through the cylinder unit 24.

  On the other hand, in FIG. 11 showing a comparative example, in the suction button 80, a substantially rod-shaped plunger 84 is movably attached to a straight pipe line 83 formed in the valve guide member 82 of the cylinder unit 81. Yes. The plunger 84 has an internal conduit 87 communicating with the side surface opening 85 and the bottom surface opening 86 therein, and an air passage 88 extending in the plunger axial direction on the outer peripheral surface thereof. ing. In addition, about the same thing as the suction button 18 of this invention on a function and a structure, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The suction button 80 configured as described above is configured so that the position of the side opening 85 is shifted upward in the plunger axial direction with respect to the connection port 90 opened on the inner wall of the pipe 83 when the plunger 84 is not pressed. The communication between the suction passage 17 and the negative pressure source passage 21 is blocked. At this time, the communication between the negative pressure source passage 21 and the atmosphere is performed through the vent hole 92 and the vent passage 88 of the cap 91 as indicated by arrows in the drawing. For this reason, since the size of the diameter L2 of the internal conduit 87 through which the sucked material passes is restricted by the ventilation path 88, the diameter L2 cannot be sufficiently increased.

  In contrast to the suction button 80 of the comparative example, in the suction button 18 of the present invention, it is not necessary to form a passage for atmospheric communication on the inner wall of the plunger 25 and each of the pipelines 40 to 42. Therefore, the negative pressure source passage 21 can be communicated with the atmosphere, and the diameter L1 of the internal conduit 60 can be made as large as possible in the plunger 25. As a result, the internal conduit 60 can pass a larger solid suction as compared to the internal conduit 87 described above.

  In the embodiment described above, the ventilation opening 76 and the passage opening 77 of the ventilation path 78 are opened on the same straight line, but the positions of the openings 76 and 77 may be shifted. The opening position of the ventilation opening 76 is not particularly limited as long as it is on the peripheral portion of the cylinder opening 35 that is pressed by the skirt portion 63 during the pressing operation.

  In the above embodiment, the plunger 25 is maintained in the shut-off state by the elastic restoring force of the skirt portion 63 of the cap 26. For example, a coil spring or the like is mounted between the lid portion 62 and the distal end surface of the valve guide member 30. And you may maintain the plunger 25 in the interruption | blocking state by the urging | biasing force of this coil spring.

  In the above embodiment, the valve casing 29 and the valve guide member 30 constituting the cylinder unit 24 are separate bodies, but they may be integrated.

  In the said embodiment, although demonstrated taking the case of the suction button provided with the plunger 25 which has the cone-shaped valve part 53 as an example, the shape of a plunger is not specifically limited, This invention is applied to the suction button provided with the plunger of various shapes. Can be applied.

  In the above embodiment, the ventilation opening 76 is opened and closed by the cap 26 having the inclined surface 74 and made of an elastic material. However, when the plunger 25 is in a communication state, the ventilation opening 76 is pressed against the ventilation opening 76 and the plunger 25. As long as the cap is a cap that forms a gap with the ventilation opening 76 in the closed state, its shape, material, etc. are not particularly limited.

  In the above embodiment, a part of the conduit of the valve guide member 30 is a conical conduit (third conduit 42), and the conical valve portion 53 that opens and closes the connection port 45 on the conical conduit is provided on the plunger 25. Although the valve guide member has a substantially straight pipe shape as shown in FIG. 11, for example, the valve portion of the plunger is also substantially straight pipe to open and close the connection port on the straight pipe line. You may make it a shape. Moreover, you may mount | wear with sealing materials, such as an O-ring, as a part of this valve part.

  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.

DESCRIPTION OF SYMBOLS 10 Endoscope 15 Suction port 17 Suction passage 18 Suction button 20 Suction pump 21 Negative pressure source passage 24 Cylinder unit 25 Plunger 26 Cap 30 Valve guide member 35 Cylinder opening 45 Connection port 52 Main body shaft part 53 Cone-shaped valve part 58 Side opening 59 Bottom opening 60 Internal pipe line 62 Lid 63 Skirt 74 Inclined surface 76 Ventilation opening 77 Passage opening 78 Ventilation path

Claims (10)

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 that communicates the passage with the atmosphere or blocks the communication with the atmosphere and communicates with the suction passage,
A cylinder provided in the operation unit, one end of which is opened at a cylinder opening and the other end is connected to the suction passage, and the negative port connected to a connection port opened in a pipe line of the cylinder. A cylinder unit having a pressure source passage;
A main body shaft portion that is movably accommodated in the conduit and has a shaft tip protruding from the cylinder opening, a valve portion provided at a shaft rear end portion of the main body shaft portion, and an opening in the bottom surface of the valve portion An inner conduit that communicates the bottom opening and the side opening opened to the side surface of the main body shaft portion, and when the shaft tip portion is not pressed, the side surface is The position of the opening is located on the one end side of the cylinder, and the valve portion closes the connection port so that the communication between the negative pressure source passage and the suction passage is interrupted, When the shaft tip is pushed into the cylinder opening by a predetermined amount, the valve part is displaced toward the other end of the cylinder to open the connection port, and the side opening is substantially in front of the connection port. By moving, the negative pressure source passage and the front A plunger comprising a suction passage in communication with the communicating,
An air passage that is provided in the cylinder unit and communicates with an opening in the passage that opens into the negative pressure source passage, and a peripheral opening that opens at a peripheral portion of the cylinder opening;
When the plunger is in the shut-off state, the negative pressure source communication path is formed through the ventilation path by forming a gap with the peripheral opening and opening the peripheral opening. An opening / closing means for blocking communication with the atmosphere of the negative pressure source passage by making contact with the atmosphere, and when the plunger is in a communication state, pressing the peripheral opening and closing the peripheral opening;
An endoscope suction button characterized by comprising:   The suction button for an endoscope according to claim 1, wherein a substantially annular convex portion is formed at a peripheral portion of the peripheral opening so as to surround the peripheral opening.   3. The endoscope suction button according to claim 1, further comprising biasing means for maintaining the plunger in the shut-off state.   The biasing unit has a lid portion connected to the shaft tip portion, and a substantially cylindrical shape surrounding the lid portion and the outer periphery of the shaft tip portion, and a skirt portion connected to the peripheral portion is integrally formed. The cap is made of an elastic material, and the cap is elastically deformed by compressing the skirt portion between the lid portion and the peripheral portion when the shaft tip portion is pushed into the cylinder opening. 4. The endoscope suction button according to claim 3, wherein the skirt portion is restored to an original shape when the pressing operation is released.   The opening / closing means is an inclined surface formed on a facing surface of the skirt portion facing the peripheral portion and on a portion facing the peripheral opening, and the inclined surface is when the plunger is in the blocking state. The endoscope according to claim 4, wherein a gap is formed between the peripheral opening and the peripheral opening, and the plunger is pressed against the peripheral opening by elastic deformation of the skirt portion when the plunger is in the communicating state. Suction button.   6. The endoscope suction button according to claim 5, wherein the inclined surface is inclined so as to gradually move away from the peripheral portion as it goes from the inside to the outside of the skirt portion.   The said skirt part performs the elastic deformation which expands in the diameter direction of the said plunger, and shrinks to the axial direction, when the said shaft front-end | tip part is pushed in in the said cylinder opening. 6. The endoscope suction button according to claim 1.   5. The predetermined amount is a pushing amount until the lid portion comes into contact with the cylinder and further pushing is restricted when the shaft tip portion is pushed into the cylinder opening. The suction button of the endoscope according to any one of 7 to 7.   The center of the opening in the passage and the center of the peripheral opening are on a common straight line parallel to the axial direction of the plunger, and the air passage is formed in a substantially straight pipe shape. The suction button for an endoscope according to any one of 1 to 8.   The rotation restricting means for restricting the rotation between the plunger and the cylinder is provided so that the side opening is substantially opposed to the connection port in the communication state. The endoscope suction button described.

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