JP2012071021A - Suction button of endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform suction under high suction pressure immediately after suction ON operation by simple operation.SOLUTION: The connection port 45 communicating with a negative pressure source passage 21 is provided in the inner wall of the pipeline of a valve guide member 24 and a plunger 25 for opening and closing the connection port 45 is provided in the valve guide member 24. An air passage 49 connecting the air opening 47 opened at the position opposed to a cap 26 and the passage opening 48 opened in a negative pressure source passage 21, is provided in the valve guide member 24. The pressure operation part 74 positioned above the air opening 47 on a lid part 62 and the inclined surface 75 opposed to the air opening 47 of the skirt part 63 thereof are formed at the cap 26. Before suction ON, the pressure operation part 74 is operated under pressure to close the air opening 47 by the inclined surface 75. Since the pump pressure of a suction pump 20 can be preliminarily set high only by the simple pressure operation of the pressure operation part 74, suction can be started under high suction pressure immediately after suction ON operation.

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 provided in the operation unit. As such a suction passage, a forceps channel used for insertion of a treatment tool such as forceps or jetting of washing water is often used, and a suction passage branched from the middle of the forceps channel is connected to a suction button. ing.

  In addition to the suction passage, a negative pressure source passage leading to a negative pressure source such as a suction pump is connected to the suction button. The suction button causes the suction passage and the negative pressure source passage to communicate with each other by the operator's pressing operation, and suction is performed from the suction port. When the pressing operation is released, the suction passage and the negative pressure source passage are communicated. It shuts off and stops the suction from a suction port (refer patent documents 1 and 2).

  In such a suction button, as shown in FIGS. 22A and 22B, a cylinder provided in the operation portion of the endoscope, the tip opening outside the operation portion, and the rear end connected to the suction passage 110 111, a valve receiver 113 provided in the pipe 112 of the cylinder 111, a connection port 115 that opens in the middle of the pipe 112 and communicates with the negative pressure source passage 114, and moves to the pipe 112. A main body shaft portion 117 having a shaft front end portion 117a that is freely mounted and protrudes from the cylinder opening 116 on the cylinder front end side, a communication passage 118 formed along the axial direction on the outer peripheral surface of the main body shaft portion 117, and a main body The plunger 120 includes a valve portion 119 provided at the shaft rear end portion of the shaft portion 117, and the cap 122 has a vent hole 121 and connects the tip end of the plunger 120 and the tip end of the cylinder 111. What it is well known.

  In the suction button having the above-described configuration, as shown in FIG. 22A, when the shaft tip portion 117 a is not pressed, the valve portion 119 comes into contact with the valve receiving portion 113, thereby causing the suction passage 110 and the negative pressure source passage 114. Communication with is interrupted. At this time, the connection port 115 communicates with the atmosphere via the communication path 118 and the vent hole 121. This is because, since the suction pump is always operating, if the negative pressure source passage 114 does not communicate with the atmosphere, the pump pressure of the suction pump increases, and the load applied to the suction pump increases accordingly. For this reason, the increase in the load of the suction pump can be suppressed by communicating the negative pressure source passage 114 with the atmosphere.

  On the other hand, as shown in FIG. 22 (B), when the shaft tip portion 117a is pushed into the cylinder opening 116 by a predetermined amount by the pressing operation, the valve portion 119 is separated from the valve receiving portion 113, so The pressure source passage 114 communicates. At the same time, an O-ring 123 attached to the shaft tip 117a is pressed against the cylinder opening 116 to block communication between the negative pressure source passage 114 and the atmosphere. Thereby, the negative pressure suction force in the negative pressure source passage 114, the pipe line 112, and the suction passage 110 is increased by the suction of the suction pump, and suction from the suction port is started.

  By the way, in the suction button having the above-described configuration, since the negative pressure source passage 114 and the atmosphere are disconnected from each other simultaneously with the suction ON operation for pushing the shaft tip portion 117a into the cylinder opening 116, the pump of the suction pump is at the time of this suction ON operation. The pressure is almost the minimum value, and the pump pressure gradually increases after this suction ON operation. As described above, since the pump pressure is low for a while after the suction ON operation is performed, suction can be performed only with a low suction pressure, and suction of the suction object may not be successful. Further, when the suction ON operation is continued until the pump pressure becomes sufficiently high, there arises a problem that the suction time becomes too long.

  In Patent Document 3, when the shape and position of the pipe 112, the valve receiving portion 113, the cylinder opening 116, the valve portion 119, the O-ring 123 and the like are appropriately adjusted, and the shaft tip portion 117a is not pressed. A suction button is provided that allows the negative pressure source passage 114 to communicate with the atmosphere (vent hole 121) and blocks the communication between the negative pressure source passage 114 and the atmosphere when the shaft tip 117a is pushed by half of a predetermined stroke amount. Has been. Thereby, since the pump pressure can be increased in advance before the suction ON operation, suction can be performed at a high suction pressure from the time of the suction ON operation.

JP-A-11-216104 JP 2008-228990 A JP 2009-225908 A

  In the suction button of Patent Document 3, communication between the negative pressure source passage and the atmosphere is interrupted by a half-pushing operation of pushing the shaft tip part by a half of a predetermined stroke amount. Adjustment of the pushing amount of the shaft tip part at this time is performed. There is a problem that suction is started at a timing unintended by the surgeon by excessively pushing the shaft tip portion by mistake.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an endoscope suction button capable of performing suction at a high suction pressure from the time of suction ON operation with a simple operation.

  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 Is connected to the atmosphere, or in a suction button of an endoscope that communicates with the suction passage by blocking communication with the atmosphere, and a cylinder provided in the operation unit, A cylinder device having a cylinder 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 a pipe of the cylinder; A plunger having a main body shaft portion that is movably accommodated in a pipe line and has a shaft tip protruding from the cylinder opening, and a valve portion provided at a shaft rear end of the main body shaft portion, The tip is pressed When there is not, the valve portion enters a blocking state that blocks communication between the negative pressure source passage and the suction passage, and when the shaft tip portion is pushed into the cylinder opening by a pressing operation, A plunger that is disconnected from the valve portion and communicates with the negative pressure source passage and the suction passage, and a peripheral opening that is provided in the cylinder device and that is open at a peripheral portion of the cylinder opening. A vent passage communicating with the source passage and the shaft tip portion are provided separately from each other, a pressing operation portion that receives a pressing operation on the peripheral opening when the plunger is in the shut-off state, and opposed to the peripheral opening Until the pressing operation portion is pressed, a negative gap is formed between the opening facing surface and the peripheral opening through the air passage. Large source passage When the pressing operation portion is pressed, the negative pressure is obtained by closing the peripheral opening by bringing the opening facing surface into pressure contact with the peripheral opening without releasing the blocking state of the plunger. Atmospheric communication control means for blocking communication of the source passage with the atmosphere.

  The atmospheric communication control means is made of an elastic material in which a lid portion connected to the tip of the shaft tip portion and a skirt portion connected to the peripheral portion and surrounding the outer periphery of the shaft tip portion are integrally formed. The cap is provided with the pressing operation portion at a position eccentric to the shaft tip portion on the lid portion, and a part of the surface of the skirt portion facing the peripheral portion is opposed to the opening. It is preferable to become a surface.

  The opening facing surface is preferably an inclined surface. Furthermore, 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.

  An annular cylindrical portion surrounding the cylinder opening is formed on the periphery of the cylinder opening and at a position closer to the cylinder opening than the peripheral opening, and a lid portion connected to the tip of the shaft tip portion A cap formed by integrally forming a skirt portion that surrounds the outer periphery of the shaft tip portion and a first fitting hole into which the tube portion is fitted, and an annular bottom portion connected to the tube portion; The atmosphere communication control means is an annular body that is provided between the peripheral portion and the bottom portion, has a second fitting hole into which the cylindrical portion is fitted, and covers the peripheral portion with a gap, An annular body having a part of the bottom surface serving as the opening-opposing surface, and a first pressing operation unit provided on the lid and substantially above the peripheral opening, wherein the first pressing operation unit is a pressing operation. The annular body is pressed against the peripheral opening through the cap. A press block for closing the peripheral opening is preferably provided with a connecting arm for connecting the press block and said annular body.

  The annular body is made of an elastic material, is formed in a substantially concave cone shape that gradually separates from the peripheral portion as it goes from the inner edge portion toward the outer edge portion, and between the pressing block and the peripheral opening in the annular body. The bottom surface of the opening facing portion located is the opening facing surface, the pressing block has a second pressing operation portion positioned on the outer peripheral side of the lid portion, and the connecting arm extends long in the axial direction of the plunger. The second pressing operation portion and the outer edge portion of the opening facing portion are connected through the side of the skirt portion, and the pressing operation of the first pressing operation portion When the second pressing operation portion is pressed after the release, the outer edge portion of the opening facing portion is pressed via the connecting arm, so that the inner edge portion of the opening facing portion moves away from the peripheral portion. Force acts, it is preferable that the opening facing surface by the force away from the peripheral opening.

  The cap preferably maintains the plunger in the shut-off state. Moreover, it is preferable that at least any one of the peripheral edge part of the said peripheral opening and the said opening opposing surface has adhesiveness.

  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. Further, the plunger has an internal conduit that communicates a bottom opening that opens to the bottom surface of the valve portion and a side opening that opens to the side surface of the main body shaft portion. On the other hand, the position of the side opening is shifted toward one end of the cylinder, and the valve portion closes the connection port to block communication between the negative pressure source passage and the suction passage. It is preferable that the negative pressure source passage and the suction passage are communicated by shifting to the other end side of the cylinder to open the connection port and moving the side opening substantially in front of the connection port.

  The suction button of the endoscope of the present invention is provided with a ventilation path in the cylinder device that connects a passage inner opening opened in a negative pressure source passage leading to a negative pressure source and a peripheral opening opened in a peripheral portion of the cylinder opening, Since the peripheral opening can be opened and closed without releasing the blocking of the communication between the negative pressure source passage and the suction passage by the plunger, it is easy to perform without a complicated half-pressing operation as described in Patent Document 3 above. It is possible to perform suction with a high suction pressure immediately after the suction start operation. This prevents the suction from being started at a timing not intended by the operator.

It is the schematic of the suction mechanism of an endoscope. It is sectional drawing of the suction button at the time of suction OFF. It is sectional drawing of the suction button at the time of attraction | suction ON. (A) is sectional drawing of a valve guide member, (B) is a perspective view of a valve guide member. It is the enlarged view to which the cross section of the ventilation path was expanded. (A), (B) is a perspective view of a plunger. (A) is sectional drawing of a cap, (B) is the perspective view which looked at the cap from the upper surface, (C) is the perspective view which looked at the cap from the bottom. (A) is sectional drawing of the suction button at the time of suction OFF, (B) is the expanded sectional view which expanded the ventilation path in (A). (A) is sectional drawing of the suction button at the time of ventilation interruption | blocking operation, (B) is an expanded sectional view which expanded the ventilation path in (A). It is sectional drawing of the suction button at the time of attraction | suction ON. It is explanatory drawing for demonstrating the time change of the pump pressure of a suction pump at the time of performing communication cutoff operation with the suction pump of this invention. It is sectional drawing of the attraction | suction button of 2nd Embodiment at the time of attraction | suction OFF. It is sectional drawing of the attraction | suction button of 2nd Embodiment at the time of attraction | suction ON. (A) and (B) are both perspective views of the plunger of the second embodiment. (A) is sectional drawing of the cap of 2nd Embodiment, (B) is the perspective view which looked at the cap from the upper surface, (C) is the perspective view which looked at the cap from the bottom. (A) is the perspective view which looked at the operation member for opening / closing from the upper surface, (B) is the perspective view which looked at the operation member for opening / closing from the bottom surface. (A) is sectional drawing of the suction button of 2nd Embodiment at the time of suction | inhalation OFF, (B) is an expanded sectional view which expanded the ventilation path in (A). Sectional drawing of the suction button of 2nd Embodiment at the time of ventilation interruption | blocking operation, (B) is an expanded sectional view which expanded the ventilation path in (A). Sectional drawing of the suction button when releasing ventilation | gas_blocking, (B) is an expanded sectional view which expanded the ventilation path in (A). It is sectional drawing of the attraction | suction button of 2nd Embodiment at the time of attraction | suction ON. It is explanatory drawing for demonstrating the suction button of other embodiment which formed the adhesion layer in the peripheral part of opening for ventilation | gas_flowing. It is sectional drawing of the conventional suction button, (A) has shown at the time of attraction | suction OFF, (B) has shown at the time of attraction | suction ON.

[First Embodiment]
As shown in FIG. 1, an endoscope 10 is a bronchoscope that is inserted into a trachea, for example, and includes an insertion portion 11 that is inserted into the trachea, and an operation portion 12 that is connected to a rear end portion of the insertion portion 11. And a universal cord 13 connected to a processor device and a light source device (not shown).

  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. When a syringe (not shown) is connected to the forceps inlet 16 and cleaning water such as physiological saline is injected from the syringe, the cleaning water is ejected from the suction port 15 through the forceps channel 14.

  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 pump 20 always performs suction during the endoscopic examination.

  In FIG. 2 showing the state when the suction is turned off and in FIG. 3 showing the state when the suction is turned on, the suction button 18 is roughly divided into a valve guide member (cylinder device) 24 fixed to the operation unit 12, and the valve guide member. 24 includes a plunger 25 accommodated in the valve 24 and a cap 26 that connects the valve guide member 24 and the plunger 25. 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.

  A substantially tubular valve casing 27 is fixed to the casing 28 of the operation unit 12, and connects the valve guide member 24 to the operation unit 12. The valve casing 27 is fixed to the casing 28 with its leading end protruding outside the casing 28 and its rear end protruding inside the casing 28. A pipe line 31 extending in the axial direction is formed in the valve casing 27. A suction connection port 32 connected to the suction passage 17 is provided at the rear end portion of the valve casing 27, and the pipe line 31 and the suction passage 17 communicate with each other through the suction connection port 32. A valve guide member 24 is connected to the opening on the distal end side of the conduit 31.

  The valve guide member 24 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 27, and has a conduit concentric with the conduit 31. is doing. A cylinder opening 35 (see FIG. 4) for projecting the shaft tip of the plunger 25 is formed at the tip of the valve guide member 24.

  A cylindrical portion 37 connected to the cap 26 is provided on an end surface (hereinafter referred to as a cylinder end surface, see FIG. 4) 24a 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) used to stop rotation with the cap 26. 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 24a.

  As shown in FIG. 4A, in the valve guide member 24, a first conduit 40 connected to the suction passage 17 through the 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 24 that is located on the side of the third conduit 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.

  As shown in FIG. 5, the valve guide member 24 includes a ventilation opening (peripheral opening) 47 opened on the cylinder end surface 24 a corresponding to the peripheral portion of the cylinder opening of the present invention, and a negative pressure source passage of the connection pipe 44. An air passage 49 is provided to connect the passage opening 48 opened in the passage 21. Thereby, the negative pressure source passage 21 can be communicated with the atmosphere via the ventilation passage 49. Further, an annular convex portion 50 is formed on the peripheral edge of the ventilation opening 47 so as to surround the ventilation opening 47.

  2 and 3, the plunger 25 is accommodated in the valve guide member 24 so as to be movable in the axial direction, and communication / blocking between the suction passage 17 and the negative pressure source passage 21 is performed by a pressing operation or pressing release. Switch. 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 24, 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.

  The shaft tip 52a is formed with a substantially annular plunger cap mounting groove 54 for connecting the cap 26 to the outer periphery thereof (see FIGS. 6A and 6B). Further, a portion of the tip end portion 52a on the tip end side of the plunger cap mounting groove 54 is cut out in a planar shape so that the second cap rotation stop surface 55 used for rotation prevention with the cap 26 is obtained. (See FIG. 6B). The tip of the shaft tip 52a serves as a pressing operation surface 56 that receives a pressing operation. The pressing operation surface 56 is formed in an inclined surface shape so as to follow the surface shape of the lid portion 62 of the cap 26.

  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. The predetermined amount here is, for example, an amount of pushing until the cap 26 comes into contact with the end surface of the cylinder tip surface 37a and further pushing is restricted.

  As shown in FIGS. 6A and 6B, the plunger 25 communicates with a side 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 24. A skirt 63 connected to the tip of the valve guide member 24 is integrally formed.

  As shown in FIG. 7A, 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.

  On the side wall surface of the fitting hole 66, a substantially planar plunger rotation stop surface 69 is formed that contacts the second cap rotation stop surface 55 of the shaft tip 52 a. 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 (bottom portion) 71 protruding 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 24 are connected in a state where the cylindrical portion 37 is fitted in the fitting hole (first fitting hole) 71a formed by the inner periphery of the second annular convex portion 71 (see FIG. 2, see FIG.

  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 73 is formed that contacts the first cap rotation stop surface 38 a of the flange 38. Thereby, the rotation of the valve guide member 24 and the cap 26 is restricted. Furthermore, the rotation of the valve guide member 24 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 (B), the upper surface of the lid portion 62 is positioned above the ventilation opening 47 and is eccentric to the center of the lid (specifically, the shaft tip 52a). A convex arc-shaped pressing operation unit 74 is provided. The pressing operation unit 74 receives a pressing operation from the operator.

  As shown in FIG. 7C, the opposing surface 71b of the second annular convex portion 71 facing the cylinder end surface 24a is at a position facing the ventilation opening 47 (also a position below the pressing operation portion 74). An inclined surface (opening facing surface) 75 is formed. The inclined surface 75 is formed by cutting out a part of the outer peripheral portion of the facing surface 71b, and is inclined so as to gradually move away from the cylinder end surface 24a from the inner periphery to the outer periphery of the skirt portion 63 (FIG. 8). reference).

  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 on the pressing operation surface 56.

  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 on the pressing operation surface 56 is released. Further, the skirt portion 63 does not elastically deform uniformly when the pressing operation portion 74 is pressed, and a portion (hereinafter, simply referred to as a directly below portion) 63a that is positioned substantially directly below the pressing operation portion 74. Is elastically deformed into a generally square shape.

  The inclined surface 75 opens and closes the ventilation opening 47. The inclined surface 75 forms a gap S (see FIG. 8B) between the ventilation opening 47 and the cylinder end surface 24a when the pressing operation portion 74 is not pressed. In addition, the inclined surface 75 comes into pressure contact with the ventilation opening 47 and the cylinder end surface 24a when the immediately lower portion 63a is elastically deformed into a generally U shape by a pressing operation on the pressing operation portion 74.

  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. 8A, 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 suction passage 17 and the negative pressure source passage 21 is blocked, and the suction from the suction port 15 is stopped.

  As shown in FIG. 8 (B), when the pressing operation portion 74 is not pressed in a normal state, the skirt portion 63 of the cap 26 and the portion 63a directly below it are not elastically deformed, and the second annular convex portion 71 is not pressed toward the cylinder end surface 24a. For this reason, the inclined surface 75 of the second annular convex portion 71 is not in pressure contact with the ventilation opening 47 or the cylinder end surface 24a, and a gap S is formed between them. Accordingly, the air passage 49 is open. As a result, the negative pressure source passage 21 communicates with the atmosphere as indicated by the arrow in FIG. 8A, so that 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.

  Prior to the suction, as shown in FIG. 9A, the pressing operation unit 74 is pressed (hereinafter referred to as a ventilation blocking operation as appropriate). By this ventilation blocking operation, the portion 63a directly below the skirt portion 63 is elastically deformed in a substantially U shape, and a portion (an inclined surface 75 is formed in the second annular convex portion 71 that is positioned immediately below the pressing operation portion 74. Is pressed toward the cylinder end surface 24a. As a result, the inclined surface 75 comes into pressure contact with the ventilation opening 47.

  At this time, since the pressing operation unit 74 is provided at a position eccentric with respect to the center of the lid 62, the plunger 25 does not move or moves even if the pressing operation unit 74 is pressed. Since the amount of movement is small, the blocking state of the plunger 25 is not released. For this reason, the negative pressure source passage 21 is communicated with the atmosphere by an extremely simple operation of simply pressing the pressing operation portion 74 without performing a complicated half-pressing operation as described in Patent Document 3 above. Can do. This prevents the suction from being started at a timing not intended by the operator.

  As shown in FIG. 9B, when the inclined surface 75 comes into pressure contact with the ventilation opening 47, the ventilation opening 47 is opened at a position one step higher than the cylinder end surface 24a by the annular convex portion 50. The inclined surface 75 is more likely to be in close contact with the ventilation opening 47 than when the opening is made on the cylinder end surface 24a. For this reason, the ventilation opening 47 can be reliably closed by the inclined surface 75. As a result, the communication between the negative pressure source passage 21 and the atmosphere is interrupted as indicated by the one-dot chain line in FIG. 9A, so that the pump pressure of the suction pump 20 increases.

  When the ventilation blocking operation is released, the portion 63a immediately below the skirt portion 63 is restored to its original shape, so that the inclined surface 75 and the ventilation opening 47 are formed as described above with reference to FIG. A gap S is formed between the negative pressure source passage 21 and the atmosphere again.

  After the ventilation blocking operation, as shown in FIG. 10, when the pressing operation surface 56 is pressed (hereinafter referred to as “suction ON operation” as appropriate), the ventilation opening 47 is kept closed by the inclined surface 75. The shaft tip 52 a is pushed into the cylinder opening 35 against the elastic force of the cap 26. As a result, the lid portion 62 moves toward the cylindrical portion 37, and the skirt portion 63 is compressed between the lid portion 62 and the cylinder end surface 24a to be elastically deformed. 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.

  When the connection port 45 is opened, the negative pressure source passage 21 and the suction passage 17 communicate with each other, and 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 24, 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 and is discharged outside the endoscope 10.

  When stopping the suction, the pressing operation on the pressing operation surface 56 is released (hereinafter referred to as suction OFF operation as appropriate). Thereby, since the skirt part 63 is restored to the original shape by the elastic restoring force, the lid part 62 and the plunger 25 are pulled up. As a result, the plunger 25 is switched from the communication state to the cutoff state, so that the communication between the negative pressure source passage 21 and the suction passage 17 is blocked by the conical valve portion 53 as described in FIG. The suction from the suction port 15 is stopped. Further, the portion 63a directly below the skirt portion 63 is restored to the original shape, so that the negative pressure source passage 21 communicates with the atmosphere as described above.

  As shown in FIG. 11, the suction button 18 performs a ventilation block operation in advance before the suction ON operation, so that the pump pressure of the suction pump 20 (the negative pressure suction force of the negative pressure source passage 21 is also shown) as shown by the thick line in the figure. The same) is rising. For this reason, the pump pressure is sufficiently high when the suction ON operation is performed. In addition, by performing the ventilation blocking operation after performing the suction OFF operation and before performing the next suction ON operation, the pump pressure can be sufficiently increased even during the next suction ON operation.

  On the other hand, in the conventional suction button as described with reference to FIG. 22, the communication between the negative pressure source passage 21 and the atmosphere is shut off simultaneously with the suction ON operation. For this reason, as indicated by a thin line in the figure, the pump pressure of the suction pump at the time of the suction ON operation is substantially minimum, and the pump pressure increases after the suction ON operation. For this reason, when the suction ON operation is set to 0 second, with the conventional suction button, it takes about 10 seconds for the pump pressure to reach the level when the suction button 18 of the present invention is used (2 in the figure). Displayed with a dotted line). Since the suction time of the sucked material from the suction port 15 is usually about 2 seconds, the conventional suction button can perform suction only at a low suction pressure, and the suction material cannot be sucked well or is not sucked. May take time.

  In contrast to such a conventional suction button, the suction button 18 of the present invention blocks the communication between the negative pressure source passage 21 and the atmosphere while maintaining the shut-off state of the plunger 25 by the ventilation shut-off operation before the suction ON operation. Since the pump pressure of the suction pump 20 can be sufficiently increased, suction can be performed at a high suction pressure from the time of the suction ON operation, and the suctioned object can be suctioned reliably and in a short time.

[Second Embodiment]
Next, the suction button 80 according to the second embodiment of the present invention will be described. In the suction button 18 of the first embodiment, the ventilation opening 47 is opened and closed by the inclined surface 75 of the cap 26, but in the suction button 80, the ventilation opening 47 is opened and closed using a member different from the cap 26. I do. In addition, about the thing same as the suction button 18 of 1st Embodiment on a function and a structure, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In FIG. 12 showing the state at the time of suction OFF and FIG. 13 showing the state at the time of suction ON, the suction button 80 includes a plunger 82, a cap 83, an opening / closing operation member (in addition to the valve guide member 24 described above). Atmospheric communication control means) 84.

  As shown in FIG. 14, the plunger 82 has the same structure as the plunger 25 of the first embodiment except that the pressing operation surface 56a is formed in a flat shape according to the surface shape of the cap 83. A detailed description thereof will be omitted.

  As shown in FIGS. 15A to 15C, the cap 83 is roughly divided into a substantially disc-shaped lid portion 86 and a substantially cylindrical skirt portion 87, and basically the first embodiment. The cap 26 has the same structure. However, the lid 86 is provided with a cut-out surface 88 at a position above the ventilation opening 47 and eccentric with respect to the center of the lid, instead of the above-described pressing operation portion 74. A second annular convex portion 89 having a shape different from that of the second annular convex portion 71 of the first embodiment is formed at the rear end portion of the skirt portion 87.

  The second annular convex portion 89 is basically the same structure as the second annular convex portion 71 of the first embodiment except that the inclined surface 75 described above is not formed. A guide member rotation stop surface 73 is formed. Similarly to the first embodiment, the cylindrical portion 37 is fitted into a fitting hole (first fitting hole) 89a formed by the second annular convex portion 89.

  As shown in FIGS. 16A and 16B, the opening / closing operation member 84 is made of an elastic material, and is roughly formed by integrally forming an annular body 91, a pressing block 92, and a connecting arm 93. The annular body 91 has a fitting hole (second fitting hole) 94 into which the cylindrical portion 37 is fitted, and is attached between the second annular convex portion 89 of the cap 83 and the cylinder end surface 24a. .

  Further, the annular body 91 has a substantially concave cone shape that gradually separates from the cylinder end surface 24a as it goes from the inner edge portion 91a to the outer edge portion 91b. For this reason, the bottom surface 91c of the annular body 91 is an inclined surface. Reference numeral 91 d denotes an opening facing portion of the annular body 91 located between the ventilation blocking operation portion 92 a and the ventilation opening 47. The bottom surface 91c of the opening facing portion 91d corresponds to the opening facing surface of the present invention.

  The pressing block 92 is provided substantially above the lid portion 86 and the ventilation opening 47. One end portion of the pressing block 92 is located on the notch surface 88 and serves as a ventilation blocking operation portion (first pressing operation portion) 92a that is pressed when the ventilation opening 47 is closed. The other end portion of the pressing block 92 is located on the outer peripheral side of the lid portion 86 and serves as a ventilation operation portion (second pressing operation portion) 92 b that is pressed when the ventilation opening 47 is opened.

  The connecting arm 93 has a substantially columnar shape, and passes through the side of the skirt portion 87 to connect the ventilation operation portion 92b of the pressing block 92 and the outer edge portion 91b of the opening facing portion 91d of the annular body 91. ing.

  Returning to FIGS. 12 and 13, an annular convex portion 95 having a shape different from the annular convex portion 50 of the first embodiment is formed on the cylinder end surface 24 a and on the peripheral edge portion of the ventilation opening 47. The tip surface of the annular convex portion 95 is formed in a substantially tapered surface shape so as to follow the shape of the bottom surface of the annular body 91.

  Next, the operation of the suction button 80 configured as described above will be described. As shown in FIG. 17A, before the suction ON operation, as described in the first embodiment, the communication between the suction passage 17 and the negative pressure source passage 21 is blocked by the conical valve portion 53, Suction from the suction port 15 is stopped. At this time, as shown in FIG. 17B, before the ventilation blocking operation portion 92a is pressed, the bottom surface 91c of the annular body 91 is not in pressure contact with the ventilation opening 47 or the cylinder end surface 24a. A gap S is formed between them. Therefore, the air passage 49 is open, and the negative pressure source passage 21 communicates with the atmosphere.

  Before performing the suction ON, as shown in FIG. 18 (A), the ventilation blocking operation unit 92a is pressed. By this operation, the ventilation blocking operation portion 92a comes into pressure contact with the notch surface 88, whereby the opening facing portion 91d of the annular body 91 is pressed toward the ventilation opening 47 and the cylinder end surface 24a via the cap 83. By this pressing operation, the opening facing portion 91 d is elastically deformed, and the bottom surface 91 c comes into pressure contact with the ventilation opening 47. At this time, since the ventilation blocking operation part 92a and the notch surface 88 are provided at positions eccentric from the center of the lid part 86, the blocking state of the plunger 25 is released as in the first embodiment. Never happen. Therefore, as in the first embodiment, the negative pressure source passage 21 can be communicated with the atmosphere with a simple operation.

  As shown in FIG. 18B, when the bottom surface 91c of the opening facing portion 91d is in pressure contact with the ventilation opening 47, the ventilation opening 47 is located at a position one step higher than the cylinder end surface 24a by the annular convex portion 95. Since it opens in the shape along the bottom face 91c, the bottom face 91c becomes easy to stick to the ventilation opening 47. For this reason, the ventilation opening 47 can be reliably closed. Thereby, the communication between the negative pressure source passage 21 and the atmosphere is blocked, and the pump pressure of the suction pump 20 increases. Here, the bottom surface 91 c of the opening facing portion 91 d is maintained in close contact with the ventilation opening 47 by suction from the ventilation opening 47.

  If suction is not continuously performed, the ventilation operation unit 92b is pressed as shown in FIG. By this operation, the outer edge portion 91b of the opening facing portion 91d is pressed toward the cylinder end surface 24a through the connecting arm 93. As a result, a force in a direction away from the cylinder end surface 24a acts on the inner edge portion 91a of the opening facing portion 91d. As a result, as shown in FIG. 19B, since the bottom surface 91c of the opening facing portion 91d is separated from the ventilation opening 47, a gap S is formed between the bottom surface 91c and the ventilation opening 47, and a negative pressure is generated. A source passage 21 communicates with the atmosphere.

  On the other hand, when the suction is started, the pressing operation surface 56a is pressed as shown in FIG. By this operation, the connection port 45 is opened and the suction passage 17 and the negative pressure source passage 21 communicate with each other while maintaining the state in which the ventilation opening 47 is closed. Similar to the first embodiment, since the pump pressure of the suction pump 20 can be sufficiently increased before the suction ON operation, the same effect as the first embodiment can be obtained.

  When stopping the suction, by releasing the pressing operation on the pressing operation surface 56a, the communication between the negative pressure source passage 21 and the suction passage 17 is cut off as described above with reference to FIG. The suction from the suction port 15 is stopped. At this time, if the ventilation opening 47 is blocked by the opening facing portion 91d, the ventilation operation unit 92b is pressed as described above with reference to FIGS. 19A and 19B. Thus, the ventilation opening 47 is opened.

  In the first embodiment, the annular protrusion 50 is formed on the peripheral edge of the ventilation opening 47 so that the inclined surface 75 can be in close contact with the ventilation opening 47. For example, as shown in FIG. The adhesive layer 98 may be formed on the peripheral edge of the ventilation opening 47. It is preferable that the adhesive layer 98 is formed of a material having an adhesive force such that the inclined surface 75 is in close contact during the above-described suction ON operation and the close contact with the inclined surface 75 is released during the above-described suction OFF operation. Further, instead of forming the adhesive layer 98 on the peripheral edge of the ventilation opening 47, the adhesive layer 98 may be formed on the inclined surface 75, or the adhesive layer 98 may be formed on both. Furthermore, in the drawing, the annular convex portion 50 is formed at the peripheral edge of the ventilation opening 47, but when the adhesive layer 98 is formed, the annular convex portion 50 may not be formed.

  In the embodiment of FIG. 21 described above, the case where the adhesive layer 98 is formed on the peripheral edge of the ventilation opening 47 of the first embodiment is described as an example, but the ventilation opening of the second embodiment is described. The adhesive layer 98 may be formed on one of the peripheral edge portion 47 and the bottom surface 91c of the opening facing portion 91d.

  In each of the above-described embodiments, the case where the ventilation opening 47 is opened and closed by the inclined surface 75 of the cap 26 and the opening / closing operation member 84 has been described. However, the plunger 25 and 82 are not moved substantially without moving the plunger 25 and 82. As long as it can be opened and closed, its structure, shape, material, etc. are not particularly limited.

  In the above embodiment, the ventilation opening 47 and the passage opening 48 of the ventilation passage 49 are opened on the same straight line, but the positions of the openings 47 and 48 may be shifted. The opening position of the ventilation opening 47 is not particularly limited as long as it is on the peripheral portion of the cylinder opening 35.

  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 24. And you may maintain the plunger 25 in the interruption | blocking state by the urging | biasing force of this coil spring.

  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, a part of the conduit of the valve guide member 24 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 formed on the plunger 25. Although the valve guide member has a substantially straight pipe shape as shown in FIG. 22, for example, the plunger valve portion 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 Valve guide member 25, 82 Plunger 26, 83 Cap 35 Cylinder opening 45 Connection port 47 Ventilation opening 48 Venting opening 49 Ventilation channel 50, 95 Annular convex part 52 Main body shaft part 53 Conical valve part 58 Side opening 59 Bottom opening 60 Internal pipe 62, 86 Lid part 63, 87 Skirt part 74 Press operation part 75 Inclined surface 84 Opening / closing operation member 91 Annular body 92 Pressing block 93 Connecting arm

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 device having a pressure source passage;
A plunger having a main body shaft portion that is movably accommodated in the pipe line and has a shaft tip portion protruding from the cylinder opening, and a valve portion provided at a shaft rear end portion of the main body shaft portion, When the shaft tip portion is not pressed, the valve portion shuts off the communication between the negative pressure source passage and the suction passage, and the shaft tip portion is placed in the cylinder opening by the pressing operation. A plunger that, when pressed in a certain amount, is released from the shut-off by the valve portion and communicates with the negative pressure source passage and the suction passage;
A vent passage provided in the cylinder device and communicating with the negative pressure source passage through a peripheral opening that is open at a peripheral portion of the cylinder opening;
Provided separately from the shaft tip, and having a pressing operation part that receives a pressing operation on the peripheral opening when the plunger is in the blocking state, and an opening facing surface that faces the peripheral opening And until the pressing operation portion is pressed, the negative pressure source passage is communicated with the atmosphere through the ventilation passage by forming a gap between the opening facing surface and the peripheral opening, When the pressing operation portion is pressed, the opening facing surface is brought into pressure contact with the peripheral opening without releasing the blocking state of the plunger, thereby closing the peripheral opening and the atmosphere of the negative pressure source passage. Atmospheric communication control means for blocking the communication of,
An endoscope suction button characterized by comprising:   The atmospheric communication control means is made of an elastic material in which a lid portion connected to the tip of the shaft tip portion and a skirt portion connected to the peripheral portion and surrounding the outer periphery of the shaft tip portion are integrally formed. The cap is provided with the pressing operation portion at a position eccentric to the shaft tip portion on the lid portion, and a part of the surface of the skirt portion facing the peripheral portion is opposed to the opening. 2. The endoscope suction button according to claim 1, wherein the suction button is a surface.   The endoscope suction button according to claim 2, wherein the opening facing surface is an inclined surface.   4. The endoscope suction button according to claim 3, 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. An annular cylindrical portion surrounding the cylinder opening is formed on the periphery of the cylinder opening and at a position closer to the cylinder opening than the peripheral opening,
A lid portion connected to the tip of the shaft tip portion, a skirt portion surrounding the outer periphery of the shaft tip portion, a first fitting hole into which the tube portion is fitted, and an annular shape connected to the tube portion It has a cap formed integrally with the bottom,
The atmospheric communication control means includes
An annular body that is provided between the peripheral portion and the bottom portion and has a second fitting hole into which the cylindrical portion is fitted, and covers the peripheral portion with a gap, and a part of the bottom surface thereof An annular body serving as the opening-opposing surface;
A first pressing operation portion provided on the lid portion and substantially above the peripheral opening; and when the first pressing operation portion is pressed, the annular body is inserted into the periphery through the cap. A pressing block that presses against the opening and closes the peripheral opening;
The suction button for an endoscope according to claim 1, further comprising a connecting arm that connects the annular body and the pressing block. The annular body is made of an elastic material, is formed in a substantially concave cone shape that gradually separates from the peripheral portion as it goes from the inner edge portion toward the outer edge portion, and between the pressing block and the peripheral opening in the annular body. The bottom surface of the opening facing portion located is the opening facing surface,
The pressing block has a second pressing operation portion located on the outer peripheral side of the lid portion,
The connecting arm has a substantially columnar shape extending long in the axial direction of the plunger, and connects the second pressing operation portion and the outer edge portion of the opening facing portion through the side of the skirt portion. And
When the second pressing operation portion is pressed after releasing the pressing operation of the first pressing operation portion, the outer edge portion of the opening facing portion is pressed through the connecting arm, whereby the inner edge of the opening facing portion 6. The endoscope suction button according to claim 5, wherein a force in a direction away from the peripheral portion acts on the portion, and the opening facing surface is separated from the peripheral opening by the force.   The endoscope suction button according to claim 2, wherein the cap maintains the plunger in the shut-off state.   The suction button for an endoscope according to any one of claims 1 to 7, wherein at least one of a peripheral edge portion of the peripheral opening and the opening facing surface has adhesiveness.   The endoscope suction button according to any one of claims 1 to 8, wherein a substantially annular convex portion is formed at a peripheral portion of the peripheral opening so as to surround the peripheral opening.   The plunger has an inner conduit that communicates a bottom opening that opens to the bottom surface of the valve portion and a side opening that opens to the side surface of the main body shaft portion. The position of the side opening is shifted to one end of the cylinder, and the valve portion closes the connection port to block communication between the negative pressure source passage and the suction passage. 2. The negative pressure source passage and the suction passage are communicated with each other by opening the connection port by shifting to an end side, and moving the side opening substantially in front of the connection port. The suction button of the endoscope according to any one of Items 9 to 9.

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