JP5552014B2 - Endoscope suction button - Google Patents

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 the suction from a suction port is stopped (refer patent documents 1 thru | or 5).

  As shown in FIGS. 15A and 15B, such a suction button is a cylinder provided at the operation portion of the endoscope, having a distal end opened outside the operation portion and a rear end connected to the suction passage 100. It is well known that it is composed of 101, a plunger 103 movably accommodated in a pipe line 102 of the cylinder 101, and a cap 104 connecting the cylinder 101 and the plunger 103.

  The cylinder 101 is formed of a resin material having elasticity, and a valve receiving portion 105 having a substantially conical pipe line is provided in the pipe line 102. In addition, a connection port 108 communicating with the negative pressure source passage 107 is opened between the cylinder opening 106 in the conduit 102 and the valve receiving portion 105.

  The plunger 103 is provided at a main body shaft portion 110 having a front end portion 110 a protruding from the cylinder opening 106, and a rear end portion of the main body shaft portion 110, and has a substantially cone-shaped valve portion along the inner wall of the valve receiving portion 105. 111 is integrally formed. The plunger 103 is incorporated into the cylinder 101 by inserting the valve portion 111 and the rear end portion into the pipe line 102 from the cylinder opening 106 side. At this time, since the maximum diameter of the valve portion 111 is larger than the minimum diameter of the conduit of the valve receiving portion 105, the force that pushes the main body shaft portion 110 into the cylinder opening 106 when the valve portion 111 passes through the valve receiving portion 105. Temporarily strengthen. Thereby, the passage of the valve portion 111 becomes possible by elastically deforming and expanding the diameter of the conduit of the valve receiving portion 105, and the valve receiving portion 105 is restored to its original shape after passing through the valve portion 111. The assembly operation of the plunger 103 is completed.

  The cap 104 is formed of an elastic material such as rubber, and connects the tip of the tip portion 110 a and the tip of the cylinder 101, and constantly urges the tip portion 110 a in a direction protruding from the cylinder opening 106. Further, a vent hole 112 communicating with the atmosphere is opened on the side surface of the cap 104.

  In the suction button having the above-described configuration, when the distal end portion 110 a is not pressed as shown in FIG. 15A, the suction passage 100 and the negative pressure source passage 107 are brought into contact with the valve receiving portion 105. Is disconnected. At this time, the negative pressure source passage 107 communicates with the atmosphere via the gap between the plunger 103 and the pipe passage 102, the cylinder opening 106, the vent hole 112, and the like. This is because, since the suction pump is always operating, if the negative pressure source passage 107 does not communicate with the atmosphere, the pump pressure of the suction pump increases, and the load applied to the suction pump increases accordingly. For this reason, the increase in the load of the suction pump can be suppressed by connecting the negative pressure source passage 107 to the atmosphere.

  On the other hand, as shown in FIG. 15B, when the tip portion 110a is pushed into the cylinder opening 106 by a predetermined amount by the pressing operation, the valve portion 111 is separated from the valve receiving portion 105, thereby causing the suction passage 100 and the negative pressure. The source passage 107 communicates. At the same time, the O-ring 113 fitted to the distal end portion 110a is pressed against the cylinder opening 106 to close the cylinder opening 106, thereby blocking communication between the negative pressure source passage 107 and the atmosphere. Thereby, the negative pressure suction force in each pipe line leading to the negative pressure source passage 107 is increased by the suction of the suction pump, and suction from the suction port is started.

JP 2007-185276 A JP-A-5-161599 JP-A-6-070880 JP-A-11-318908 JP-A-62-189041

  In the suction button having the above configuration, when the tip portion 110a is not being pressed and operated, the valve portion 111 is brought into contact with the valve receiving portion 105 to block communication between the suction passage 100 and the negative pressure source passage 107. Yes. At this time, if the size of the valve portion 111 is small, when the error of the shape of the valve receiving portion 105 or the rattling of the plunger 103 occurs, the above-described blocking becomes insufficient and the valve portion 111 is sucked from the suction port. There is a possibility that the sucked material leaks into the pipe line 102. For this reason, it is preferable to enlarge the valve part 111. However, if the valve portion 111 is enlarged, when the plunger 103 is assembled into the cylinder 101, the valve portion 111 cannot pass through the pipe passage of the valve receiving portion 105, and there is a possibility that the assembly cannot be performed.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an endoscope suction button including a plunger having a large-diameter valve portion and easily incorporated into a cylinder.

In order to achieve the above object, the present invention provides a suction passage that is provided in an operation portion of an endoscope, communicates with a suction opening that opens at the distal end of the endoscope insertion portion, and a negative pressure source passage that is connected to a negative pressure source Are connected to the negative pressure source passage and the suction passage, and the suction button of the endoscope is a cylinder provided in the operation portion, one end of which is connected to the suction passage. A cylinder that is opened at a first cylinder opening that communicates with the other end and is opened at a second cylinder opening that communicates with the outside of the operation portion, and a connection port that opens to the negative pressure source passage in a cylinder pipe; A main body shaft portion having a first tip portion inserted into the cylinder conduit from the first cylinder opening, and a valve mechanism portion having a valve portion provided at a first rear end portion of the main body shaft portion; At least from the second cylinder opening A pressing operation part having a protruding part, a pressing operation part extending coaxially with the valve mechanism part, having a second rear end part connected to the first tip part and a second tip part receiving the pressing operation Ri Do from the parts, said during non pressing operation of pressing the operation portion becomes cut-off state in which the communication between the suction passage and the negative pressure source passage by the valve unit, wherein at the time of depressing operation portions pressing operation of the valve portion A connection plunger that releases the shut-off and communicates the negative pressure source passage and the suction passage, and a portion closer to the first cylinder opening than the connection port of the cylinder pipe A conical pipe line whose diameter gradually decreases from the other end side toward the one end side is included, and the valve portion has a diameter larger than the diameter of the conical pipe line and the conical pipe. A substantially conical shape along the inner wall of the road, Together during state abuts the inner wall of the pyramidal shaped conduit, wherein at the time of communication with, characterized in that away from the inner wall of the pyramidal shaped conduit.

  A claw portion that is formed at the tip of the first tip portion and extends long in the axial direction, and a claw engagement hole that is formed at the second rear end portion and engages with the claw portion. preferable.

  The second rear end portion is positioned on the second cylinder opening when the connecting plunger is in the shut-off state, and is connected to the tip of the second tip portion and the one end of the cylinder, respectively. A cap that surrounds the outer periphery of the operating portion, wherein the side surface of the cap has a vent hole communicating with the atmosphere; and the side surface of the second rear end portion is engaged with the claw engaging hole. It is preferable to include an opening window that exposes the tip of the claw portion, and a rotation restricting means that restricts rotation between the coupling plunger and the cap so that the opening window substantially faces the vent hole.

  The negative pressure source passage preferably communicates with the atmosphere through the connection port, the cylinder conduit, the second cylinder opening, and the vent hole when the connecting plunger is in the shut-off state. The cap is preferably made of an elastic material, and the connecting plunger is preferably maintained in the shut-off state.

  The claw portions are a pair of claw portions having a length equal to or longer than the axial length of the pressing operation portion, and the claw engaging holes are formed to penetrate the pressing operation portion in the axial direction. In addition, it is preferable that a pair of openings opened on the distal end surface of the second distal end portion, and the distal ends of the pair of claws are respectively hooked on edges of the pair of openings.

  The tips of the pair of claws are hooked on the opening edges of the pair of openings opposite to the opening edges on the sides adjacent to each other, and the tips of the pair of claws protruding from the pair of openings are When the knob is operated, the engagement between the pair of claw portions and the claw engagement holes is preferably released.

Also, it is preferable that the negative pressure source is a suction pump.

The suction button of the endoscope of the present invention has a cone-shaped pipe in a portion closer to the first cylinder opening than the connection port of the cylinder pipe, and has a diameter larger than the diameter of the cone-shaped pipe and the cone-shaped pipe. The valve portion is formed in a substantially conical shape along the inner wall of the passage, and the valve mechanism portion inserted into the cylinder conduit from the first cylinder opening is connected to a pressing operation portion provided on the second cylinder opening side. As a result, since the connecting plunger is incorporated in the cylinder, it is not necessary to pass the valve portion through the cylinder pipe during this incorporation. As a result, the plunger can be easily assembled even when the size of the valve portion is sufficiently larger than the inner diameter of the cylinder pipe. Further, by releasing the connection between the valve mechanism portion and the pressing operation portion, the both can be separated and subjected to the cleaning / disinfecting process. Furthermore, the user can easily perform the incorporation of the connecting plunger after the cleaning / disinfecting process.

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. It is a perspective view of a valve guide member. (A), (B) is a perspective view of a connection plunger. (A) is a perspective view of a cap, (B) is sectional drawing of a cap. It is description for demonstrating the integration procedure of a connection plunger. It is explanatory drawing for demonstrating the structure which can confirm the connection part of the connection plunger visually. It is the enlarged view to which the cross section of the suction button at the time of suction OFF was expanded. It is the enlarged view to which the cross section of the suction button at the time of suction ON was expanded. It is sectional drawing of the attraction | suction button of 2nd Embodiment, and shows the state at the time of attraction | suction OFF. It is sectional drawing of the attraction | suction button of 2nd Embodiment, and shows the state at the time of attraction | suction ON. (A), (B) is a perspective view of the plunger of 2nd Embodiment. (A), (B) is explanatory drawing for demonstrating the decomposition | disassembly procedure of the connection plunger of 2nd Embodiment. 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. 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 FIG. 3 showing the state when the suction is turned on, the suction button 18 is roughly divided into a valve guide member (cylinder) 24 fixed to the operation unit 12, and the valve guide member 24. The plunger 25 accommodated in the inside and the valve guide member 24 and the cap 26 which connects the plunger 25 are comprised. In the following description, the upper side in the figure is referred to as the front end side, and the lower side in the figure is referred to as the rear end side.

  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 rear end portion fitted and connected to an opening on the distal end side of the valve casing 27, and has a conduit concentric with the conduit 31. A distal end side cylinder opening (second cylinder opening) 35 for projecting the distal end portion of the coupling plunger 25 is opened at the distal end portion of the valve guide member 24.

  As shown in FIG. 4, a cylindrical portion 37 that is connected to the cap 26 is provided on an end surface (hereinafter referred to as a cylinder end surface) 24 a at the front end of the cylinder and on a peripheral portion of the front end side cylinder opening 35. A flange 38 is formed on the outer peripheral surface of the tip of the cylindrical portion 37. The flange 38 is formed with a cap rotation stop surface 38a used for stopping rotation with the cap 26 by cutting out a part of the flange 38 in a planar shape. Further, a substantially annular cylinder cap mounting groove 39 (see FIGS. 2 and 3) to which the cap 26 is coupled is formed by the bottom surface of the flange 38, the outer peripheral surface of the cylindrical portion 37, and the cylinder end surface 24a.

  2 and 3, the valve guide member 24 has a straight tubular pipe 41 extending coaxially with the pipe 31 and having a distal end opened as a tip side cylinder opening 35, and the straight pipe. A tubular valve receiver 42 connected to the rear end of the pipe 41 is formed.

  A connection pipe 44 connected to the negative pressure source passage 21 is provided at a portion of the valve guide member 24 located on the side of the straight pipe line 41. The connection pipe 44 extends long in a direction substantially orthogonal to the straight pipe line 41 and constitutes a part of the negative pressure source passage 21. A connection port 45 leading to the connection pipe 44 is opened on the inner wall of the straight pipe line 41.

  The rear end of the valve receiver 42 is opened as a rear end side cylinder opening (first cylinder opening) 46. A first conical conduit 47 and a second conical conduit 48 are formed in the valve receiver 42 along the direction from the rear end side cylinder opening 46 toward the front end side cylinder opening 35. The first conical pipe 47 corresponds to the conical pipe of the present invention, and the diameter gradually decreases toward the tip side cylinder opening 35. The second conical pipe line 48 has a shape that gradually increases in diameter toward the distal end side cylinder opening 35, and connects the front end of the first conical pipe line 47 and the rear end of the straight pipe line 41. To do.

  2, 3, and 5 (A) and 5 (B), the connecting plunger 25 is accommodated in the valve guide member 24 so as to be movable in the axial direction thereof. The communication / blocking with the pressure source passage 21 is switched.

  The connection plunger 25 is formed by connecting the valve mechanism portion 25a and the pressing operation portion 25b. The valve mechanism portion 25 a includes a main body shaft portion 50 and a substantially conical valve portion (hereinafter simply referred to as a conical valve portion) 51.

  The main body shaft portion 50 is inserted into the first and second conical pipe lines 47 and 48 and the straight pipe line 41 from the rear end side cylinder opening 46, and the front end side cylinder opening is opened when the first front end portion 50a is suction-off. It has reached the vicinity of 35. At the tip of the first tip 50a, a pair of claws 52 that extend long toward the front in the axial direction are provided.

  The pair of claw portions 52 protrudes from the tip side cylinder opening 35 when suction is OFF. Engaging claws 52a are formed on the surfaces of the pair of claws 52 on the opposite sides of the surfaces facing each other.

  The conical valve portion 51 is provided at the first rear end portion 50 b of the main body shaft portion 50. The cone-shaped valve portion 51 has a shape along the inner wall of the first cone-shaped pipe 47 and is formed so that the maximum diameter is larger than the inner diameter of the first cone-shaped pipe 47.

  The pressing operation part 25b extends coaxially with the valve mechanism part 25a in a state of protruding onto the distal end side cylinder opening 35. A substantially disc-shaped head portion 55 is provided at the distal end of the second distal end portion 54a of the pressing operation portion 25b to receive a pressing operation from the operator when suction is ON.

  A claw engagement hole 56 that extends long in the axial direction and engages with the pair of claw portions 52 is formed in the second rear end portion 54b of the pressing operation portion 25b. The inner diameter of the claw engagement hole 56 is formed smaller than the distance between the pair of engagement claws 52a. In addition, a pair of opening windows 58 communicating with the claw engagement holes 56 are formed on the side surface of the second rear end portion 54b. The opening windows 58 are formed at a pitch interval of 180 degrees, and the engaging claws 52a of the pair of claw portions 52 are hooked on the edges thereof. Thereby, a pair of nail | claw part 52 engages with the nail | claw engaging hole 56, and the valve mechanism part 25a and the press operation part 25b are connected.

  Further, a stopper portion 60 (see FIG. 5) is provided between the second front end portion 54a and the second rear end portion 54b. The stopper portion 60 has a conical shape that gradually increases in diameter as it moves away from the tip side cylinder opening 35. When the pressing operation portion 25b is pushed into the distal end side cylinder opening 35, the stopper portion 60 abuts against the distal end side cylinder opening 35 and restricts further pushing.

  In the connection plunger 25 having the above-described configuration, when the pressing operation is not performed on the head portion 55, the conical valve portion 51 abuts against the inner wall of the first conical conduit 47 and closes the rear end side cylinder opening 46. As a result, the communication between the suction passage 17 and the negative pressure source passage 21 is cut off (see FIG. 2). Further, the connecting plunger 25 is configured such that when the pressing operation portion 25 b is pushed into the distal end side cylinder opening 35 by a predetermined amount by the pressing operation on the head portion 55, the conical valve portion 51 extends from the inner wall of the first conical conduit 47. By opening the rear end side cylinder opening 46 away from each other, the suction passage 17 and the negative pressure source passage 21 are communicated with each other (see FIG. 3). Here, the predetermined amount is, for example, the amount of pushing until the stopper portion 60 contacts the tip side cylinder opening 35 and further pushing is restricted.

  An aspirant passage 61 extending in the axial direction is formed on the outer peripheral surface of the main body shaft portion 50. The length of the aspirant passage 61 is such that when the connecting plunger 25 is switched to the communication state, the passage front end portion 61a is positioned substantially in front of the connection port 45, and the passage rear end portion 61b is more than the valve receiving portion 42. The length is adjusted so as to be located on the pipe 31 side.

  A cap rotation stop groove 62 (see FIG. 5) used for rotation prevention with the cap 26 is formed in the head portion 55 by cutting out a part of the outer peripheral portion thereof. A substantially annular plunger cap mounting groove 63 (see FIGS. 2 and 3) for connecting the cap 26 is formed between the head portion 55 and the stopper portion 60.

  2 and 3, the cap 26 is formed of an elastic material such as rubber. The cap 26 has a substantially disc-shaped lid portion 65 coupled to the head portion 55, a substantially cylindrical shape surrounding the lid portion 65, the pressing operation portion 25 b, and the cylindrical portion 37, and is coupled to the cylindrical portion 37. The skirt portion 66 is integrally formed.

  As shown in FIG. 6A, a fitting hole 67 into which the head portion 55 is fitted is formed on the upper surface of the lid portion 65. On the inner peripheral wall of the fitting hole 67, a rotation stop projection 68 that engages with the cap rotation stop groove 62 of the head portion 55 is provided. Thereby, rotation between the coupling plunger 25 and the cap 26 is restricted.

  A through hole 69 through which a part of the pressing operation portion 25 b passes is formed at the center of the bottom of the fitting hole 67. The annular inner wall portion 70 constituting the through hole 69 is fitted into the plunger cap mounting groove 63 described above. Thereby, the connection plunger 25 and the cover part 65 are connected.

  As shown in FIG. 6B, the tip of the skirt portion 66 is integrated with the outer periphery of the lid portion 65. In addition, a substantially annular bottom portion 73 having a fitting hole 72 into which the cylindrical portion 37 is fitted is provided at the rear end portion of the skirt portion 66. The inner peripheral wall of the bottom portion 73 covers the outer peripheral portion of the upper end surface of the cylindrical portion 37 and the groove fitting portion 73a that fits into the above-described cylinder cap mounting groove 39, and the flange 38 between the groove fitting portion 73a. An annular convex portion 73b is formed. Accordingly, the cylindrical portion 37 is connected to the bottom portion 73 in a state where the cylindrical portion 37 is fitted in the fitting hole 72. The skirt portion 66 is formed with a pair of ventilation holes 75 communicating with the atmosphere at a pitch interval of 180 degrees.

  A part of the inner peripheral wall of the bottom portion 73 is formed with a substantially planar guide member rotation stop surface 73c that abuts against the cap rotation stop surface 38a of the flange 38. Thereby, the rotation of the valve guide member 24 and the cap 26 is restricted. Further, the rotation of the valve guide member 24 and the connecting plunger 25 is indirectly restricted via the cap 26. By these two indirect rotation restrictions, the passage tip portion 61a of the coupling plunger 25 in the communication state can be made substantially opposite to the connection port 45. At the same time, the opening window 58 of the pressing operation portion 25 b can be made substantially opposite to the vent hole 75.

  A substantially annular ring rib 77 is provided at a portion located on the bottom surface of the lid 65 and substantially above the annular protrusion 73b so as to surround the outer periphery of the pressing operation part 25b. The annular rib 77 is made of an elastic material such as rubber like the cap 26 and is formed integrally with the cap 26. The annular rib 77 has a substantially concave cone shape that gradually moves away from the bottom surface of the lid portion 65 as it approaches the pressing operation portion 25b.

  Returning to FIGS. 2 and 3, the cap 26 biases the coupling plunger 25 in the upward direction in the drawing, thereby maintaining the coupling plunger 25 in the blocked state. The lid portion 65 moves toward the cylindrical portion 37 when the pressing operation portion 25 b is pushed into the distal end side cylinder opening 35 by a pressing operation on the head portion 55.

  The skirt portion 66 is compressed between the lid portion 65 and the cylinder end surface 24a in accordance with the movement of the lid portion 65 by the pressing operation, and expands in the radial direction of the connecting plunger 25 and contracts in the axial direction (hereinafter referred to as “the skirt portion 66”). It is called elastic deformation as appropriate). The elastically deformed skirt portion 66 is restored to its original shape by an elastic restoring force when the pressing operation on the head portion 55 is released.

  The annular rib 77 switches communication / communication blocking between the vent hole 75 and the tip side cylinder opening 35. When the connecting plunger 25 is in the cut-off state, the annular rib 77 forms a space between the annular convex portion 73 b and allows the tip side cylinder opening 35 to communicate with the vent hole 75. Further, when the connecting plunger 25 is in a communicating state, the annular rib 77 is pressed against the upper surface of the annular convex portion 73b to block communication between the vent hole 75 and the tip side cylinder opening 35.

  Next, a method for assembling the connecting plunger 25 in the suction button 18 having the above-described configuration will be specifically described with reference to FIG. First, the first tip 50a and the pair of claws 52 of the valve mechanism 25a are inserted into the first and second conical pipes 47 and 48 and the straight pipe 41 from the rear end side cylinder opening 46. The insertion of the valve mechanism 25a is continued until the pair of claw portions 52 protrude from the distal end side cylinder opening 35.

  After the pair of claw portions 52 protrude from the front end side cylinder opening 35, the pair of claw portions 52 are inserted into the claw engagement holes 56 of the pressing operation portion 25b disposed on the front end side cylinder opening 35 side. At this time, after the positions of the engaging claws 52 a of the pair of claw parts 52 and the opening window 58 of the pressing operation part 25 b are aligned, the pair of claw parts 52 are inserted into the claw engaging holes 56. When the pair of claw portions 52 are inserted into the claw engagement holes 56, the pair of claw portions 52 are elastically deformed in a direction approaching each other, and are continuously inserted into the claw engagement holes 56 so that the engagement claw 52 a reaches the opening window 58. Sometimes restore to the original state. As a result, when the engaging claw 52a is hooked on the edge of the opening window 58, the pair of claw portions 52 engage with the claw engaging holes 56, and the valve mechanism portion 25a and the pressing operation portion 25b are connected. Thus, the connecting plunger 25 is incorporated into the valve guide member 24.

  As described above, in the present invention, when the connecting plunger 25 having the two-part structure is incorporated into the valve guide member 24, the valve mechanism 25a is inserted into the valve guide member 24 from the rear end side cylinder opening 46 side. It is not necessary to pass the conical valve part 51 through the shaped pipe 47. As a result, even when the diameter d1 of the conical valve portion 51 is sufficiently larger than the inner diameter d2 of the first conical pipe 47, the connecting plunger 25 can be easily incorporated into the valve guide member 24. Further, by releasing the connection between the valve mechanism portion 25a and the pressing operation portion 25b, both can be separated and subjected to a cleaning / disinfecting process. Further, the user can easily perform the incorporation of the connecting plunger 25 after the cleaning / disinfecting process.

  In the above description, the case in which the valve operating portion 25b is connected to the valve mechanism 25a after the valve mechanism 25a is inserted into the valve guide member 24 has been described. After the rear end portion 54b is inserted into the front end side cylinder opening 35, the valve mechanism portion 25a may be connected to the pressing operation portion 25b.

  After the coupling plunger 25 is incorporated in the valve guide member 24, the cap 26 is coupled to the coupling plunger 25 and the valve guide member 24, respectively. Thereby, the connection plunger 25 is maintained in the interruption | blocking state.

  At this time, as shown in FIG. 8, the coupling plunger 25 and the valve guide member 24 are indirectly connected via the cap 26 so that the opening window 58 of the pressing operation portion 25b is substantially opposed to the vent hole 75 of the cap 26. Rotation is restricted. For this reason, it can be visually confirmed through the ventilation hole 75 and the opening window 58 that the pair of claw portions 52 are engaged with the claw engagement holes 56.

  Next, the operation of the suction button 18 having the above configuration will be described. During endoscopic examination, suction by the suction pump 20 is always performed. At the time of suction OFF, as shown in FIG. 9, the coupling plunger 25 is maintained in the shut-off state by the cap 26, so that the conical valve portion 51 is pressed against the inner wall of the first conical pipe line 47.

  At this time, since the outer peripheral wall of the conical valve portion 51 is shaped to fit the inner wall of the first conical conduit 47, the conical valve portion 51 is in close contact with the inner wall of the first conical conduit 47 without a gap. . Furthermore, as described above, the diameter d1 of the cone-shaped valve part 51 can be made sufficiently larger than the inner diameter d2 of the first cone-shaped pipe line 47, so that the valve receiving part 42 and the first cone-shaped pipe line 47 Even when a shape error or rattling of the connecting plunger 25 occurs, the rear end side cylinder opening 46 can be reliably closed. For this reason, various body fluids and solids (hereinafter referred to as a suction product) are sucked from the suction port 15 and are prevented from leaking into the straight pipe line 41 or the like. Further, the conical valve portion 51 is prevented from entering the straight pipe line 41 in the shut-off state.

  Thus, since the communication between the suction passage 17 and the negative pressure source passage 21 is completely blocked (indicated by a two-dot chain line in the figure), the suction from the suction port 15 is stopped. Further, at this time, the annular rib 77 is separated upward in the figure of the annular convex portion 73b, and a space is formed between the two, so that the tip side cylinder opening 35 communicates with the atmosphere via the vent hole 75. To do. For this reason, the negative pressure source passage 21 communicates with the atmosphere through the connection port 45, the gap between the straight pipe line 41 and the coupling plunger 25, the gap between the tip side cylinder opening 35 and the coupling plunger 25, and the vent hole 75. (Displayed with a solid line in the figure). As a result, the suction pump 20 is prevented from being loaded.

  When performing suction, as shown in FIG. 10, the pressing operation portion 25 b is pushed into the distal end side cylinder opening 35 by a pressing operation on the head 55. As a result, the lid portion 65 of the cap 26 moves toward the cylindrical portion 37 and the skirt portion 66 is elastically deformed. If the annular rib 77 comes into contact with the upper surface of the annular convex portion 73b during the movement of the lid portion 65 and the pressing operation continues, the annular rib 77 is pressed against the annular convex portion 73b. This pressing operation is continued until the stopper portion 60 comes into contact with the distal end side cylinder opening 35.

  When the stopper portion 60 comes into contact with the front end side cylinder opening 35, the connecting plunger 25 is switched from the shut-off state to the communication state, and the conical valve portion 51 moves from the inner wall of the first conical pipe line 47 to the front of the rear end side cylinder opening 46. The rear end side cylinder opening 46 is opened by moving away (downward in the figure). Thereby, the suction passage 17 and the negative pressure source passage 21 communicate with each other. Further, since the annular rib 77 is brought into pressure contact with the annular convex portion 73b, the communication between the tip side cylinder opening 35 and the vent hole 75 is blocked, and therefore the communication between the negative pressure source passage 21 and the atmosphere is blocked (see FIG. Middle, indicated by a two-dot chain line).

  In this way, the suction passage 17 and the negative pressure source passage 21 communicate with each other, and the communication between the negative pressure source passage 21 and the atmosphere is interrupted, so that the inside of the negative pressure source passage 21 and each pipe line leading to the passage are connected. The negative pressure suction force is increased, and the suction object is sucked from the suction port 15. The suctioned material passes through the suction passage 17, the suction connection port 32, and the conduit 31, and then, as shown by the solid line in the figure, the straight pipe conduit 41, the suction material passage 61, the connection port 45, and the negative pressure source passage 21. It is discharged to the outside of the endoscope 10 through.

  When stopping the suction, by releasing the pressing operation on the head 55, the communication between the suction passage 17 and the negative pressure source passage 21 is blocked and the negative pressure is released as described above with reference to FIG. The source passage 21 communicates with the atmosphere, and suction from the suction port 15 is stopped. Hereinafter, when the suction is performed, the connecting plunger 25 is switched to the communication state by a pressing operation. Conversely, when the suction is stopped, the pressing operation is canceled and the connecting plunger 25 is switched to the shut-off state.

[Second Embodiment]
Next, the suction button 80 according to the second embodiment of the present invention will be described. In the suction button 18 of the first embodiment, the tips of the pair of claw portions 52 of the valve mechanism 25a are housed in the pressing operation portion 25b. In the suction button 80, the tips of the pair of claw portions are pressed operation portions. Exposed outside.

  11 showing the state when the suction is turned off and FIG. 12 showing the state when the suction is turned on, the suction button 80 is basically the suction button of the first embodiment except that the structure of the connecting plunger 81 is different. 18 is the same configuration. In addition, about the thing functionally same as the suction button 18, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The connection plunger 81 connects the valve mechanism part 81a and the pressing operation part 81b. As shown in FIGS. 13A and 13B, the valve mechanism portion 81a includes the main body shaft portion 50, the conical valve portion 51, and the aspirate passage 61 in the same manner as the valve mechanism portion 25a of the first embodiment. Although it has, a pair of nail | claw part 82 different from 1st Embodiment is provided in the 1st front-end | tip part 50a.

  The pair of claw portions 82 are formed to have a length substantially the same as the axial length of the pressing operation portion 81b. Engaging claws 82a are formed on the surfaces of the pair of claws 82 on the opposite sides of the surfaces facing each other.

  A claw engagement hole 83 penetrating in the axial direction is formed in the pressing operation portion 81b. Further, a concave portion 85 is formed on the surface of the head portion 55 of the pressing operation portion 81b by cutting out a portion excluding the outer peripheral portion. On the bottom surface of the recess 85, a notch 86 is formed to which the engaging claw 82 a is hooked by cutting out a part of the opening edge of the claw engaging hole 83. In addition, a dividing plate 87 that divides the opening of the claw engaging hole 83 into two is formed in the recess 85.

  11 and 12, the procedure for incorporating the connection plunger 81 having the above-described configuration into the valve guide member 24 is the same as that in the first embodiment, and the valve mechanism portion 81a is connected to the valve guide member 24 from the rear end side cylinder opening 46 side. After the insertion, the pair of claw portions 82 are inserted into the claw engagement holes 83 of the pressing operation portion 81b. As a result, the engaging claws 82a of the pair of claw portions 82 are hooked on the notch portions 86, so that the pair of claw portions 82 engage with the claw engaging holes 83, and the valve mechanism portion 81a and the pressing operation portion 81b. Are linked. Since the conical valve portion 51 does not pass through the first conical conduit 47 as in the first embodiment, the diameter of the conical valve portion 51 should be sufficiently larger than the inner diameter of the first conical conduit 47. Thus, the same effect as in the first embodiment can be obtained.

  Further, when the pair of claw portions 82 are engaged with the claw engagement holes 83, the tip portions of the pair of claw portions 82 are exposed on the head 55. For this reason, as shown by the arrow in FIG. 14 (A), by operating the tip of the pair of claw portions 82, the pair of claw portions 82 and the claw engagement as shown in FIG. 14 (B). The engagement with the hole 83 can be released, and the valve mechanism 81a can be separated from the pressing operation portion 81b. Thereby, the disassembly / cleaning / disinfecting process of the suction button 80 can be easily performed, and the connecting plunger 81 after the cleaning / disinfecting process can be easily incorporated as in the first embodiment.

  Since the action of the suction button 80 is basically the same as the action of the suction button 18 described in the first embodiment, the description thereof is omitted here. In the second embodiment, the length of the pair of claws 82 is formed to be substantially the same as the axial length of the pressing operation portion 81b, but the length of the pair of claws 82 is the pressing operation portion 81b. It may be formed longer than the axial length.

  In each said embodiment, a valve mechanism part is engaged by engaging a pair of claw parts 52 and 82 provided in valve mechanism parts 25a and 81a with claw engagement holes 56 and 83 provided in press operation parts 25b and 81b. Although 25a, 81a and the press operation parts 25b, 81b are each connected, the connection structure of a valve mechanism part and a press operation part is not specifically limited, Arbitrary connection structures can be used.

  In the above embodiment, the coupling plunger 25 is maintained in the cut-off state by the elastic restoring force of the skirt portion 66 of the cap 26. For example, a coil spring or the like is mounted between the lid portion 65 and the tip of the valve guide member 24. Then, the coupling plunger 25 may be maintained in a cut-off state by the biasing force of the coil spring.

  In the above embodiment, the description has been given by taking the suction button including the connection plunger 25 having the conical valve portion 51 and the valve guide member 24 having the straight pipe line 41 and the valve receiving portion 42 as an example. The shape of the conduits of the valve portion and the valve guide member is not particularly limited, and the present invention can be applied to a suction button including a connecting plunger having various shape valve portions and a valve guide member having various shapes.

  In each of the above embodiments, the valve mechanism portions 25a and 81a and the pressing operation portions 25b and 81b are connected in the vicinity of the distal end side cylinder opening 35. However, the axial lengths of the valve mechanism portion and the pressing operation portion are set differently. They may be appropriately changed and both may be connected above the tip side cylinder opening 35 or in the straight pipe line 41.

  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 17 Suction passage 18, 80 Suction button 21 Negative pressure source passage 24 Valve guide member 25, 81 Connection plunger 25a, 81a Valve mechanism part 25b, 81b Press operation part 26 Cap 45 Connection port 52, 82 A pair of nail | claw part 56,83 Claw engagement hole 58 Open window 75 Ventilation hole

Claims (8)

A suction passage that is provided in the operation portion of the endoscope and communicates with a suction opening that opens at a distal end of the endoscope insertion portion and a negative pressure source passage that is connected to a negative pressure source are connected to each other, and the negative pressure source In the endoscope suction button for switching communication / blocking between the passage and the suction passage,
A cylinder provided in the operation unit, one end of which is opened at a first cylinder opening that communicates with the suction passage, and the other end that is opened at a second cylinder opening that communicates with the outside of the operation unit. A cylinder in which a connection port leading to the negative pressure source passage is opened,
A main body shaft portion having a first tip portion inserted into the cylinder conduit from the first cylinder opening, and a valve mechanism portion having a valve portion provided at a first rear end portion of the main body shaft portion; A pressing operation portion at least partially protruding from the second cylinder opening and extending coaxially with the valve mechanism portion, a second rear end portion connected to the first tip portion, and a second receiving a pressing operation Ri Do from the pushing operation section having a tip portion, wherein at the time of non-pressing operation of the pressing element will cut-off state in which the communication between the suction passage and the negative pressure source passage by the valve unit, the pushing operation section A connecting plunger that releases a shut-off by the valve portion during a pressing operation and enters a communication state that connects the negative pressure source passage and the suction passage;
The portion on the first cylinder opening side with respect to the connection port of the cylinder pipe includes a conical pipe whose diameter gradually decreases from the other end toward the one end, and
The valve portion has a substantially conical shape that is larger in diameter than the diameter of the cone-shaped pipeline and extends along the inner wall of the cone-shaped pipeline, and contacts the inner wall of the cone-shaped pipeline in the shut-off state. In addition, the endoscope suction button is characterized in that it is separated from the inner wall of the conical duct in the communication state . A claw formed at the tip of the first tip and extending long in the axial direction;
The suction button for an endoscope according to claim 1, further comprising a claw engagement hole formed at the second rear end portion and engaged with the claw portion. The second rear end is located on the second cylinder opening when the connecting plunger is in the shut-off state,
Caps that are respectively connected to the tip of the second tip and the one end of the cylinder and surround the outer periphery of the pressing operation part, and a cap that has a vent hole communicating with the atmosphere on its side surface;
An opening window formed on a side surface of the second rear end portion and exposing a tip of the claw portion engaged with the claw engagement hole;
The endoscope suction button according to claim 2, further comprising a rotation restricting unit that restricts rotation between the coupling plunger and the cap so that the opening window substantially faces the vent hole. .   The negative pressure source passage communicates with the atmosphere through the connection port, the cylinder conduit, the second cylinder opening, and the vent hole when the connecting plunger is in the shut-off state. Item 5. The endoscope suction button according to Item 3. The endoscope suction button according to claim 3 or 4, wherein the cap is made of an elastic material and maintains the connecting plunger in the shut-off state. The claw parts are a pair of claw parts having a length equal to or longer than the axial length of the pressing operation part,
The claw engagement hole is formed so as to penetrate the pressing operation portion in the axial direction thereof, and has a pair of openings opened at a distal end surface of the second distal end portion, and is formed at an edge of the pair of openings. The suction button for an endoscope according to claim 2, wherein tips of the pair of claws are respectively hooked. The tips of the pair of claws are hooked on the opening edge opposite to the opening edge on the side adjacent to the pair of openings,
7. The engagement between the pair of claw portions and the claw engagement holes is released when the tips of the pair of claw portions protruding from the pair of openings are operated. The endoscope suction button described. The endoscope suction button according to any one of claims 1 to 7, wherein the negative pressure source is a suction pump.

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