JP2018164565A - Endoscope attachment / detachment equipment - Google Patents

Abstract

A detachable device that is detachable from an endoscope main body is designed to prevent erroneous attachment of parts removed from the endoscope after use. A detachable device for an endoscope includes a support body provided on a main body of the endoscope, a detachable body detachable from the support body and functioning in the attached state, and a detachable body provided on the detachable body and attached to the support body and a fragile portion that is not broken by the mounting action and is broken by the removal action from the support. By destroying the fragile portion by the removing operation, it is possible to easily and reliably identify that the attachable/detachable body has been used. [Selection drawing] Fig. 10

Description

  The present invention relates to an endoscope attachment / detachment device.

  In the endoscope, various devices that can be attached to and detached from the endoscope main body and function in the mounted state are used. For example, an operation device for controlling the flow of fluid such as suction, air supply, and water supply is known in which an operation unit including a push button is detachable (see Patent Document 1). Among this type of detachable devices, there is a so-called disposable type device that removes and discards parts after using the endoscope and attaches new parts at the next use.

Japanese Patent No. 3143164

  Disposable-type attachment / detachment devices for endoscopes are required to comply with single use, but there is a risk that parts to be discarded will be erroneously mounted again when the appearance is not noticeable. In particular, in an endoscope room under a dim environment, such a problem is likely to occur because it is difficult to visually recognize the state of contamination of the parts after removal.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an endoscope attachment / detachment device that is unlikely to be erroneously attached after use of a component that can be attached to and detached from an endoscope main body. .

  An endoscope attachment / detachment device according to the present invention includes a support provided in a body of an endoscope, an attachment / detachment that can be attached to and detached from the support, and that functions in the attached state, and is provided in the attachment / detachment. And a fragile portion that is not damaged by the mounting operation and is destroyed by the detaching operation from the support.

  As one form of this invention, a support body is provided with the support body space opened to the outer surface side of an endoscope, and the detachable body is a main body member that can be inserted into and removed from the support body space of the support body, and the main body member. And a detachment operation member that is supported rotatably about an axis that faces the insertion / removal direction. The detachment operation member applies a moving force in the detachment direction from the support to the main body member by rotation in the detachment rotation direction. The main body member is provided with a fragile portion, and the detachment operation member includes a destruction inducing portion that causes at least a part of the fragile portion to be destroyed by a rotation operation in the removal direction.

  More specifically, the support body penetrates the cylindrical part surrounding the support body space, the inner peripheral surface and the outer peripheral surface of the cylindrical part, and extends laterally from the opening of the support body space in the insertion direction of the main body member. A part. The main body member is connected to the insertion portion located in the inside of the support body space when mounted on the support body, and protrudes outward from the tubular portion through the side through portion when mounted on the support body. Side protrusions. A fragile part is formed in the side protrusion, and a resistance applying part that provides resistance to the movement of the side protrusion in the insertion / removal direction is provided at an intermediate position of the side through part.

  It is preferable that the weak part is provided in the area | region located inside a side penetration part in the mounting state to a support body among the side protrusion parts.

  The fragile portion includes a first destroyed portion that is destroyed by the destruction-inducing portion of the detachment operation member, and the main body member in the detachment direction against the resistance of the resistance applying portion in a state where the first fragile portion is destroyed. And a second portion to be destroyed that is destroyed by a load when moving.

  Each of the insertion portion and the side protrusion in the main body member has a removable body space communicating with the support body space, and the side protrusion is a tube surrounding the removable body space, The portion includes a thin portion positioned at the bottom of a bottomed recess formed on the outer peripheral surface of the side protrusion, and the first fractured portion is a pair of recesses facing away from each other in the extending direction of the tubular body. It is preferable to provide a bridging portion for bridging the inner surface of the.

  It is preferable to provide a plurality of bridging portions at intervals in the depth direction of the recess.

  Of the bridging portion, the cross-sectional area of the portion connected to at least one of the pair of inner surfaces of the recess may be smaller than the cross-sectional area of the other portion.

  You may equip the surface of a thin part with the groove part extended in the circumferential direction of a tubular body.

  It is preferable that the recessed part which comprises a weak part is formed in the side which faces the detachment | leave direction of the main body member from a support body on the outer surface of a tubular body.

  A pressing operation having a movable valve that is movably supported in the insertion / removal direction with respect to the main body member and moves to a blocking position that blocks fluid flow between the support body space and the removable body space and a communication position that allows fluid flow. By including the member and the urging means that urges the pressing operation member to the blocking position, it can be applied as an operation device that controls fluid flow.

  For example, a first conduit connected to the support body space and a second conduit connected to the detachable body space via the side protrusions, the first conduit being an insertion portion of the endoscope By connecting to the provided suction port and connecting the second pipe line to the suction source, it can function as an operating device for suction.

  According to the present invention, after the detachable body is removed, the detachable body is provided with the fragile portion that is not destroyed by the mounting operation with respect to the support body provided on the main body of the endoscope but is broken by the detaching operation from the support body. It is possible to easily identify whether or not Thereby, it is possible to obtain an attachment / detachment device for an endoscope that is unlikely to be erroneously attached after use of a part that can be attached to and detached from the endoscope body.

It is a figure which shows an endoscope notionally. It is sectional drawing of the state which is not pressing operation of the button with the suction operation apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the state which pressed the button with the suction operation apparatus. It is the figure which expanded a part of FIG.2 and FIG.3. It is a front view of the button unit which comprises a suction operation apparatus. It is the figure which expanded a part of FIG. It is the side view of the button unit which showed the part which follows the VII-VII line of FIG. 5 as a cross section. It is the figure which expanded a part of FIG. It is a perspective view which shows the structure of the weak part provided in the button unit. It is a side view which shows the state in the middle of assembling a button unit to a cylinder. It is a side view of the suction operation device in a state where the button unit is assembled to the cylinder, (A) shows the entire suction operation device, (B) schematically shows the cam mechanism. It is a side view of the suction operation device in the middle of removing the button unit from the cylinder, (A) shows the entire suction operation device, (B) schematically shows the cam mechanism. It is the figure which expanded a part of FIG. It is a front view which shows the button unit after removal.

  An endoscope 10 having a schematic configuration shown in FIG. 1 is used in the medical field, and has an insertion portion 11 having a small diameter to be inserted into a patient's body and an operation portion 12 connected to a base portion of the insertion portion 11. doing. A universal tube 13, which is a flexible tubular body, extends from the operation unit 12, and a video connector 14 is provided at the distal end of the universal tube 13. The video connector 14 is detachable from the processor 15.

  An imaging lens system (not shown) and an imaging element (not shown) are provided at the distal end of the insertion portion 11. An image to be observed is formed by the imaging lens system and converted into a signal by the imaging device. This signal is sent to the video connector 14 via the image signal cable and processed by an image processing circuit provided in the video connector 14 and the processor 15 to display an image on a monitor (not shown) or a recording medium. Image data can be recorded (not shown). The endoscope 10 and the processor 15 further include illumination means for distributing illumination light from a light distribution window provided at the distal end of the insertion portion 11.

  A suction pipe (first pipe) 16 is disposed inside the endoscope 10. The suction conduit 16 connects between a suction port 18 provided at the distal end of the insertion portion 11 and a suction operation device 19 provided in the operation portion 12. The suction source 22 provided outside the endoscope 10 and the suction operation device 19 are connected by a suction conduit (second conduit) 23.

  When the suction source 22 is driven, a suction force is generated. In a state in which the suction operation device 19 is not operated, the suction pipe line 16 and the suction pipe line 23 are not in communication, and the suction force works only between the suction source 22 and the suction operation device 19 through the suction pipe line 23. A suction force does not reach the pipe line 16. When the suction operation device 19 is operated, the suction conduit 16 and the suction conduit 23 communicate with each other, and a suction force reaches the suction port 18 so that body fluid, filth, and the like can be sucked from the suction port 18. The specific structure of the suction operation device 19 will be described later.

  The operation unit 12 is further provided with a plurality of push button switches 27. The push button switch 27 is provided as an operating means for sending an electrical signal in response to a pressing operation to perform a predetermined operation (control). As an example, operations such as shooting of an observation target (image recording) and image freezing on a monitor can be performed using the push button switch 27.

  The suction operation device 19 in the endoscope 10 described above applies the detachable device according to the present invention. Details of the suction operation device 19 will be described with reference to FIG. As shown in FIGS. 2 and 3, the suction operation device 19 includes a cylinder (support body) 30, a valve body (main body member) 31, a piston (press operation member) 32, a button (press operation member) 33, a compression spring ( (Urging means) 34 and a sleeve ring (detachment operation member) 35. Although details will be described later, the cylinder 30 is fixedly supported by the operation unit 12, and the valve body 31, the piston 32, the button 33, the compression spring 34, and the sleeve ring 35 are detachable button units with respect to the cylinder 30. (Removable body) 80 is constituted.

  The direction in which the button unit 80 is inserted and removed from the cylinder 30 (the vertical direction in FIGS. 2 to 8 and FIGS. 10 to 14) is defined as the insertion / removal direction. Of the insertion / removal directions, the direction indicated by the arrow U in the figure is the upper side, and the direction indicated by the arrow D is the lower side. The lower side is the direction in which the button unit 80 is inserted into the cylinder 30, and the upper side is the direction in which the button unit 80 is detached from the cylinder 30. Further, an imaginary line extending in the insertion / removal direction through the center of the piston 32 is defined as an axis X (FIGS. 2 and 3), a radial direction based on the axis X is defined as a radial direction of the cylinder 30 and the button unit 80, and the axis X is defined as The centering direction is the circumferential direction of the cylinder 30 and the button unit 80. Since the direction of the suction operation device 19 changes depending on the holding state of the endoscope 10, the insertion / removal directions (upward and downward) described in the following description do not necessarily coincide with the vertical direction.

  In a state in which the button unit 80 is mounted (inserted) on the cylinder 30, the valve body 31 is held while its relative movement with respect to the cylinder 30 is restricted, and the piston 32 and the button 33 are supported by the valve body 31 so that they can be pressed downward. Is done. The sleeve ring 35 is supported so as to be rotatable about an axis X (FIGS. 2 and 3).

  The cylinder 30 has a large-diameter portion (tubular portion) 40 on the upper side in the insertion / removal direction and a small-diameter portion 41 on the lower side. A cylinder inner space (space in the support body) 42 penetrating in the insertion / removal direction across the large diameter portion 40 and the small diameter portion 41 is formed inside the cylinder 30. The upper end of the large-diameter portion 40 is an upper end opening 30 a (FIGS. 2 and 3) that is open to the outer surface side of the endoscope 10. At the lower end of the small-diameter portion 41, a conical tapered portion 41a whose diameter gradually decreases as it proceeds downward in the insertion / removal direction is formed, and a cylindrical pipe connection is made downward from the center of the tapered portion 41a. The part 43 protrudes. The in-cylinder space 42 is a portion excluding the tapered portion 41a and the pipe connection portion 43, and is surrounded by a cylindrical inner surface having a substantially constant inner diameter size.

  As shown in FIGS. 2 and 3, the large-diameter portion 40 has a larger radial thickness than the small-diameter portion 41, and the outer peripheral surface of the large-diameter portion 40 protrudes in the outer-diameter direction from the outer peripheral surface of the small-diameter portion 41. Yes. Due to the difference in outer diameter size between the large diameter portion 40 and the small diameter portion 41, a stepped portion 44 that faces downward is formed on the outer surface of the cylinder 30.

  As shown in FIG. 10, a side through portion 45 that penetrates the cylinder 30 in the radial direction (through the inner circumferential surface and the outer circumferential surface of the large diameter portion 40) is formed in a part of the circumferential direction of the large diameter portion 40. Has been. The side through portion 45 has an upper end that is open to communicate with the upper end opening 30a, and is recessed downward from the open portion along the insertion / removal direction. 45a, a constant width portion 45b, a narrow portion (resistance applying portion) 45c, and a fitting holding portion 45d.

  The width of the introduction portion 45a decreases in the circumferential direction as it progresses downward from above facing the upper end opening 30a. The constant width portion 45b has a substantially constant width in the circumferential direction. The narrow portion 45c has a shape narrowed down in the circumferential direction more narrowly than the constant width portion 45b. The fitting holding part 45d constitutes the bottom part of the side through part 45, and has a circular shape with an upper part connected to the narrow part 45c being opened.

  The cylinder 30 is further provided with a guide cam 46. The guide cam 46 is a convex end face cam provided on the upper end side of the large-diameter portion 40, and is provided with three guide cams 46 at different positions in the circumferential direction. FIG. 10, FIG. 11 (A), and FIG. 12 (A) show two guide cams 46 among them. As shown in FIGS. 2 and 3, the guide cam 46 is formed on the outer peripheral surface side of the large diameter portion 40, and an inner cylindrical portion 40 a that is a part of the large diameter portion 40 is formed on the inner diameter side of the guide cam 46. Is provided. The inner peripheral surface of the inner cylindrical portion 40a is a smooth cylindrical surface, and there is no unevenness on the cylinder inner space 42 side due to the formation of the guide cam 46.

  Each guide cam 46 has a top surface 46a facing the upper end side of the large-diameter portion 40, an insertion / removal direction surface 46b and an inclined surface 46c located on both sides of the top surface 46a in the circumferential direction. The top surface 46a is a surface extending in the circumferential direction and does not include an inclination component in the insertion / removal direction. The insertion / removal direction surface 46b is a surface extending in the insertion / removal direction and does not include an inclination component in the circumferential direction. The inclined surface 46c has an inclination component that increases the distance from the insertion / removal direction surface 46b as it moves downward from the top surface 46a. When the cylinder 30 which is a cylindrical body is developed in a planar shape, the inclined surface 46c becomes an inclined surface having a substantially constant inclination angle throughout. Of the three guide cams 46, the insertion / removal direction surface 46b of one guide cam 46 overlaps the inner surface of the constant width portion 45b of the side through portion 45 (see FIG. 10).

  As shown in FIGS. 2 and 3, the valve body 31 includes an insertion support portion (insertion portion) 50 extending in the insertion / removal direction, and a side pipe portion (side protrusion portion) protruding in the radial direction from the insertion support portion 50. 51. An internal space (detachable body space) 52 penetrating in the insertion / removal direction is formed in the insertion support part 50, and an internal space (detachable body space) 53 penetrating in the radial direction is formed in the side pipe part 51. One end of 53 communicates with the internal space 52. At the lower end of the insertion support portion 50, a tapered inner surface 54 having a conical inner shape that increases the inner diameter as it proceeds downward is formed.

  As shown in FIGS. 2 and 3, an outer protrusion 56 having a diameter larger than the inner diameter of the cylinder inner space 42 is provided at the upper end of the insertion support 50 in the valve body 31. On the upper surface of the outward projecting portion 56, an annular spring support groove 57 opened upward is formed at a position surrounding the internal space 52. A fitting recess 58 (FIGS. 2 and 3) facing the outer diameter side and a rotation restricting protrusion 59 (FIGS. 2 and 3) protruding in the outer diameter direction are formed on the outer peripheral surface of the outer protrusion 56. Yes.

  As shown in FIGS. 2 to 4, 7, 8, 10, 11 (A), 12 (A), and 13, the side pipe portion 51 in the valve body 31 is a cylinder surrounding the internal space 53. It has a cross-sectional shape. A suction source connection port 60 (FIGS. 2 and 3) is provided at the tip of the side tube portion 51.

  In the side tube portion 51, a fragile portion 81 is formed at a position close to the proximal end connected to the insertion support portion 50. The weakened portion 81 in a state before the button unit 80 is removed from the cylinder 30 is shown in an enlarged manner in FIGS. 4, 6, 8, and 9. The fragile portion 81 includes a bridging portion (first destroyed portion) 83, a thin portion (second destroyed portion) 84, and a groove portion in a recessed portion 82 provided on the outer peripheral surface of the side pipe portion 51. 85.

  The concave portion 82 is a standing wall-like shape that connects the bottom surface 82 a located closer to the center of the side tube portion 51 in the radial direction than the outer peripheral surface of the side tube portion 51, and the bottom surface 82 a and the outer peripheral surface of the side tube portion 51. It has a pair of opposing surfaces (inner surface of a recessed part) 82b and 82c. The facing surface 82b and the facing surface 82c are spaced apart from each other in the extending direction of the side tube portion 51 (the radial direction of the button unit 80). Between the bottom surface 82a of the recess 82 and the inner peripheral surface of the internal space 53, there is a thin portion 84 having a smaller thickness than other portions of the side tube portion 51 (portions where the recess 82 is not formed). .

  The fragile portion 81 is provided with three bridging portions 83 arranged in parallel in the depth direction of the recess 82 (radial direction of the side tube portion 51). Each bridging portion 83 is a thin plate-like portion that extends in the extending direction of the side tube portion 51 and connects the facing surface 82b and the facing surface 82c. The three bridging portions 83 are arranged at intervals in the depth direction of the recess 82, and there is a gap 86 between them. There is also a gap 86 between the bridging portion 83 located on the innermost side in the radial direction of the side tube portion 51 and the thin portion 84 (bottom surface 82a). That is, in the radial direction of the side pipe portion 51, the three bridging portions 83 and the one thin portion 84 are intermittently arranged with a gap 86 therebetween. The outer surface of the bridging portion 83 located on the outermost side in the radial direction is substantially flush with the outer peripheral surface of the side tube portion 51 (see FIG. 9).

  As shown in FIG. 9, the narrow portion 83a having a smaller width (small cross-sectional area) than the other portion of each bridging portion 83 at the end portion of each bridging portion 83 that is connected to the facing surface 82c. It has become.

  In the circumferential direction of the side pipe portion 51, three bridging portions 83 are located at the approximate center of the recess 82. As shown in FIGS. 8 and 9, the recess 82 has a maximum depth (height of the opposing surface 82 b and the opposing surface 82 c) at the center portion in the circumferential direction where the bridging portion 83 is provided, and in the circumferential direction. It gradually becomes shallower as the distance from the bridge portion 83 increases. Therefore, the thickness of the thin portion 84 is small at the portion aligned with each bridging portion 83, and the thickness of the thin portion 84 gradually increases as the distance from the bridging portion 83 in the circumferential direction (see FIG. 8). The depth Q1 of the part in which the bridging part 83 is provided among the recessed parts 82 is shown in FIG.

  The groove portion 85 is a long groove formed on the bottom surface 82 a (the surface of the thin portion 84), and extends in the circumferential direction of the side tube portion 51. As shown in FIG. 6, the groove 85 is located at the approximate center of the recess 82 in the extending direction of the side tube 51. Further, when the concave portion 82 is viewed in plan from above, each bridge portion 83 crosses the vicinity of the center in the longitudinal direction of the groove portion 85.

  The groove 85 has a V-shaped cross-sectional shape. As shown in FIG. 4, the thickness of the thin portion 84 is further reduced at the portion where the groove portion 85 is formed. As described above, the thin portion 84 has the smallest thickness at the portion aligned with the three bridging portions 83 (see FIG. 8). Therefore, at the portion where each bridging portion 83 and the groove portion 85 intersect when the concave portion 82 is viewed from above, the depth of the groove portion 85 is added to the depth Q1 (FIG. 8) of the concave portion 82, and the thin portion 84 The wall thickness is minimized. In other words, in the concave portion 82, the portion along the groove portion 85 is thin and has low strength, and among the portions along the groove portion 85, the region overlapping (intersecting) with the bridging portion 83 is the thinnest and the most thin. The strength is low.

  As shown in FIGS. 2 and 3, the piston 32 includes a cylindrical shaft portion 61 extending in the insertion / removal direction, a head portion 62 provided at the upper end of the shaft portion 61, and an annular shape provided in the middle of the shaft portion 61. A flange portion 63 and a movable valve 64 provided at the lower end of the shaft portion 61 are provided. The head portion 62 has a larger diameter than the shaft portion 61, and the flange portion 63 has a larger diameter than the head portion 62. The movable valve 64 has a conical outer surface shape that increases its outer diameter as it goes downward.

  As shown in FIGS. 2 and 3, the button 33 includes a cylindrical central portion 65, an upper wall portion 66 that extends from the upper end of the central portion 65 in the outer diameter direction, and extends downward from the periphery of the upper wall portion 66. An outer peripheral wall portion 67 surrounding the central portion 65 is included. At the lower end of the central portion 65, a retaining portion 65a protruding in the inner diameter direction is formed.

  As shown in FIGS. 2 and 3, the sleeve ring 35 is an annular body surrounding the outward projecting portion 56 of the valve body 31. As shown in FIGS. 5, 7, 10, 11 (A), 12 (A), and 14, the outer peripheral portion of the sleeve ring 35 has a plurality of gripping surfaces with different positions in the circumferential direction. 70 is provided. Each gripping surface 70 is a surface that is flatter than a cylindrical surface centering on the axis X (FIGS. 2 and 3). The sleeve ring 35 further has a thick portion 71 at a circumferential position different from each gripping surface 70. The thick portion 71 is a portion in which the protruding amount in the outer diameter direction is increased.

  As shown in FIGS. 7, 8, and 10 to 14, a lower protrusion (destruction inducer) 72 is provided at the lower end of the thick portion 71 of the sleeve ring 35. The downward protrusion amount of the lower protrusion 72 is set to be greater than the depth Q1 (FIG. 8) of the concave portion 82 of the side pipe portion 51 where the bridging portion 83 is provided. A contact portion 72a (FIGS. 6 and 8) is formed on the side portion of the lower protrusion 72. The contact portion 72a gradually decreases in thickness in the removal direction F1 (FIG. 11B) described later.

  On the inner peripheral surface of the sleeve ring 35, a rotation range limiting groove 73 (FIGS. 2 and 3) extending in the circumferential direction and a fitting protrusion 74 (FIGS. 2 and 3) protruding in the inner diameter direction are provided.

  The sleeve ring 35 is further provided with a guide cam 75. The guide cam 75 is a concave end face cam provided at the lower end of the sleeve ring 35, and is provided with three guide cams 75 at different positions in the circumferential direction. In FIG. 7, FIG. 10, FIG. 11 (A), and FIG. 12 (A), two guide cams 75 are shown.

  Each guide cam 75 has a top surface 75a facing the lower end side of the sleeve ring 35, an insertion / removal direction surface 75b and an inclined surface 75c located on both sides of the top surface 75a in the circumferential direction. The top surface 75a is a surface extending in the circumferential direction and does not include an inclination component in the insertion / removal direction. The insertion / removal direction surface 75b is a surface extending in the insertion / removal direction, and does not include an inclination component in the circumferential direction. The inclined surface 75c has an inclination component that increases the distance from the insertion / removal direction surface 75b as it moves downward from the top surface 75a. When the sleeve ring 35, which is an annular body, is developed in a planar shape, the inclined surface 75c becomes an inclined surface having a substantially constant inclination angle throughout.

  As shown in FIG. 11A, the guide cams 75 provided on the sleeve ring 35 and the guide cams 46 provided on the cylinder 30 have an uneven shape that fits each other. More specifically, the lengths of the top surfaces 46a and 75a, the lengths of the insertion / removal direction surfaces 46b and 75b, and the inclination angles and lengths of the inclined surfaces 46c and 75c are substantially the same.

  Among the components of the suction operation device 19 described above, the cylinder 30 is formed of a material having higher rigidity than the valve body 31 and the sleeve ring 35. Specifically, the cylinder 30 can be made of metal, and the valve body 31 and the sleeve ring 35 can be formed of a resin material such as polyethylene or polypropylene.

  The assembly of the suction operation device 19 will be described. As shown in FIG. 10, the suction operation device 19 is roughly divided into a cylinder 30 that is fixedly supported on the main body portion of the endoscope 10 and a button unit 80 that can be inserted into and removed from the cylinder 30. When assembling the suction operation device 19, the valve body 31, the piston 32, the button 33, the compression spring 34 and the sleeve ring 35 are combined to form the button unit 80, and the button unit 80 is inserted into the cylinder 30.

  The cylinder 30 is fixed to the operation unit 12 of the endoscope 10. A cylinder insertion opening (not shown) is formed in the operation unit 12, and the cylinder 30 is inserted into the cylinder insertion opening. The entire cylinder 30 and the middle of the large-diameter portion 40 are embedded in the operation portion 12 and the step portion 44 abuts against the step portion formed in the cylinder insertion opening. Insertion is restricted. Specifically, a portion of the large-diameter portion 40 above the position where the guide cam 46 is formed (above the embedding boundary line L <b> 1 indicated by a one-dot chain line in FIG. 10) is exposed on the outer surface of the operation portion 12. The cylinder 30 is fixed to the operation unit 12 by predetermined fixing means (screws, adhesion, etc.).

  In the operation unit 12, the suction pipe line 16 (FIG. 1) is connected to the pipe line connection part 43 of the cylinder 30. The suction line 16 can be connected to the line connection part 43 at a stage before the cylinder 30 is inserted into the operation part 12.

  When the button unit 80 is formed, the sleeve ring 35 is attached to the outside of the outward projecting portion 56 of the insertion support portion 50 in the valve body 31. When the sleeve ring 35 is inserted into the outward projecting portion 56 from the upper side to the lower side, the fitting projection 74 is fitted into the fitting recess 58, and the sleeve ring 35 is inserted into and removed from the valve body 31. The movement is restricted (see FIGS. 2 and 3). As shown in FIGS. 4 to 8 and the like, in this state, the lower end portion of the sleeve ring 35 is located close to the upper portion of the side tube portion 51 in the insertion / removal direction.

  Subsequently, the piston 32 is inserted into the internal space 52 of the insertion support portion 50 of the valve body 31, and the compression spring 34 is inserted into the spring support groove 57. Further, the head portion 62 of the piston 32 is inserted into the center portion 65 of the button 33. By this insertion, the relative movement in the radial direction of the piston 32 and the button 33 is restricted. Further, the retaining portion 65a is fitted in the groove-shaped portion between the head portion 62 and the flange portion 63, and the relative movement of the piston 32 and the button 33 in the insertion / removal direction is restricted. That is, the piston 32 and the button 33 are integrated. Further, the piston 32 and the button 33 are fixed with an adhesive or the like as necessary.

  When the piston 32 and the button 33 are coupled, the upper end portion of the compression spring 34 comes into contact with the upper wall portion 66 of the button 33, and the compression spring 34 is held between the lower surface of the upper wall portion 66 and the bottom surface of the spring support groove 57. (See FIG. 2). The compression spring 34 is supported so as to expand and contract in the insertion / removal direction without buckling by surrounding the cylindrical portion inside the spring support groove 57 and the center portion 65. The compression spring 34 urges the piston 32 and the button 33 upward with respect to the valve body 31, and the movable valve 64 abuts against the tapered inner surface 54 by this urging force (see FIG. 2). The position of the movable valve 64 that contacts the tapered inner surface 54 is defined as a cutoff position, and the position of the movable valve 64 that is spaced downward from the tapered inner surface 54 is defined as a communicating position. The sleeve ring 35 is positioned on the outer diameter side of the compression spring 34 together with the outer peripheral wall portion 67 of the button 33 to prevent the compression spring 34 from being exposed to the outside (see FIGS. 2 and 3).

  In the state where the button unit 80 is assembled as described above, the sleeve ring 35 is supported so as to be rotatable about the axis X (FIGS. 2 and 3) with respect to the outer peripheral surface of the outward projecting portion 56. The rotation of the sleeve ring 35 is performed until the rotation restricting protrusion 59 enters the rotation range restricting groove 73 and the rotation restricting protrusion 59 comes into contact with one end and the other end (not shown) of the rotation range restricting groove 73. Is possible.

  Further, when the sleeve ring 35 is assembled to the valve body 31 in assembling the button unit 80, the position in the rotational direction is determined so that the thick portion 71 and the side tube portion 51 are aligned in the insertion / removal direction (see FIG. 7). . When the sleeve ring 35 is assembled in this positional relationship, a part of the lower projection 72 projecting downward from the thick portion 71 enters the recess 82 (see FIGS. 6 and 8).

  7 and 8, when the sleeve ring 35 is rotated in the removal direction indicated by the arrow F <b> 1 in FIG. 11B, it is lower than the bottom surface 82 a of the concave portion 82 formed in the side pipe portion 51. The protrusion 72 contacts. As shown in FIG. 8, the bottom surface 82 a has a curved shape in which the amount of upward protrusion increases as it approaches the bridging portion 83, and therefore, a removal direction F <b> 1 that is a direction approaching the bridging portion 83 (FIG. 8). 11 (B)), when the lower protrusion 72 tries to advance, resistance acts on the lower protrusion 72. That is, when the sleeve ring 35 is attached to the valve body 31 in the circumferential positional relationship shown in FIGS. 7 and 8, the stage in which the movement in the insertion / removal direction is restricted (the fitting protrusion 74 becomes the fitting recess 58). At the stage of engagement, resistance is also applied to the rotation of the sleeve ring 35 with respect to the valve body 31, and the button unit 80 is in a state where the positional relationship between the members is stable. By aligning the side pipe portion 51 of the valve body 31 and the thick portion 71 of the sleeve ring 35 as an index, the appropriate mounting position of the sleeve ring 35 can be easily identified.

  As shown in FIG. 10, the button unit 80 is inserted into the cylinder 30 in a state in which the circumferential direction positions of the side tube portion 51 and the thick portion 71 are aligned with the side through portion 45. The button unit 80 is inserted downward from the upper end opening 30 a of the cylinder 30 with the end of the insertion support portion 50 of the valve body 31 on the side opposite to the outward projecting portion 56 as the head. In the insertion support portion 50, the outer diameter size of the portion below the outward projecting portion 56 is slightly larger than the inner diameter size of the cylinder inner space 42. Therefore, the insertion support portion 50 is press-fitted into the cylinder inner space 42 with a predetermined load, and the space between the cylinder inner space 42 and the insertion support portion 50 is sealed. Note that an O-ring made of an elastic material is provided on the outer peripheral surface of the insertion support 50 (such as an annular groove near the lower end of the insertion support 50 shown in FIGS. 2 to 5, 7, 10, and 14). May be used, and a configuration may be adopted in which the space between the cylinder inner space 42 is sealed via an O-ring.

  When a predetermined amount of the button unit 80 is inserted into the cylinder 30, the side pipe portion 51 enters the side through portion 45. The opening width of the introduction portion 45a in the side through portion 45 is larger than the outer diameter size of the side tube portion 51, and even if the cylinder 30 and the button unit 80 are slightly displaced in the circumferential direction, The side pipe part 51 can be guided into the side through part 45 by guiding the pipe part 51. The opening width of the constant width portion 45b is substantially the same as the outer diameter size of the side tube portion 51, and the side tube portion 51 proceeds downward along the constant width portion 45b. The opening width of the narrow portion 45c is smaller than the outer diameter size of the side tube portion 51. When the side tube portion 51 reaches the narrow portion 45c, resistance to insertion is added downward. When the insertion is continued by applying a force against this resistance, the side tube portion 51 made of a material having a lower rigidity than the cylinder 30 passes through the narrow portion 45c while being elastically deformed in the diameter reducing direction. Since the inner surface of the side through portion 45 from the constant width portion 45b to the narrow portion 45c has a tapered shape along the outer peripheral surface of the side tube portion 51, the elasticity of the side tube portion 51 in the reduced diameter direction. Deformation can be caused smoothly.

  When the button unit 80 is inserted into the cylinder 30, the side pipe portion 51 receives resistance accompanying the passage of the narrow portion 45 c of the side through portion 45. Although the load is applied to the fragile portion 81 due to this resistance, the fragile portion 81 is reinforced by a plurality (three) of bridging portions 83 on the outer side of the thin portion 84 including the groove portion 85 to maintain a predetermined strength. Since it is in a state, it is not destroyed by the resistance at the time of insertion into the side through portion 45.

  As shown in FIG. 4, the weakened portion 81 provided in the side tube portion 51 overlaps with the side through portion 45 (contains in the side through portion 45) in the extending direction of the side tube portion 51. Is located. More specifically, the portion of the fragile portion 81 on the outermost diameter side (opposing surface 82c) is on the inner diameter side of the outer peripheral surface of the large diameter portion 40 having the side through portion 45 (on the axis X shown in FIGS. 2 and 3). The position difference S1 is shown in FIG. By setting the position of the fragile portion 81 with respect to the side through portion 45 in this way, the fragile portion is inserted when the button unit 80 is inserted into the cylinder 30 (particularly when the side tube portion 51 passes through the narrow portion 45c). An excessive load is not applied to the portion 81, and the fragile portion 81 can be prevented from being destroyed.

  Moreover, the weak part 81 is formed in the area | region which faces the opposite side (detachment | leave direction) of the insertion direction of the button unit 80 to the cylinder 30 among the side pipe parts 51 (refer FIG. 4). This arrangement also contributes to preventing the fragile portion 81 from being destroyed when the button unit 80 is inserted into the cylinder 30.

  The insertion support portion 50 can be inserted into the cylinder inner space 42 at a portion lower than the outward protrusion 56 and the outer protrusion 56 is in contact with the upper end of the cylinder 30 (see FIGS. 2 and 3). Insertion into the cylinder inner space 42 is restricted. In this state, the outward protrusion 56 protrudes upward from the cylinder inner space 42.

  When the side tube portion 51 passes through the narrow portion 45c against resistance at the time of insertion, the side tube portion 51 is fitted into the fitting holding portion 45d as shown in FIG. Since the fitting holding part 45d has an inner surface shape along the outer peripheral surface of the side pipe part 51, the side pipe part 51 is fitted in the fitting holding part 45d in a stable state. Movement of the side pipe portion 51 in the circumferential direction or downward is regulated by the inner surface of the fitting holding portion 45d. Moreover, since the narrow part 45c is provided in the opening part above the fitting holding | maintenance part 45d, resistance is added with respect to detachment | leave of the side pipe part 51 upward from the fitting holding part 45d.

  When the button unit 80 is inserted into the cylinder 30 until the side pipe portion 51 is fitted into the fitting holding portion 45d, as shown in FIGS. 11A and 11B, the button unit 80 is provided on the side. Each of the three guide cams 75 is fitted into three guide cams 46 provided on the cylinder 30 side. More specifically, the top surface 75a faces the top surface 46a, the insertion / removal direction surface 75b faces the insertion / removal direction surface 46b, and the inclined surface 75c faces the inclined surface 46c. Thus, the side pipe portion 51 of the valve body 31 and the thick portion 71 of the sleeve ring 35 also function as a position index for fitting the guide cams 46 and the guide cams 75 together. At the stage shown in FIGS. 11A and 11B, the assembly of the button unit 80 to the cylinder 30 is completed. In this state, the button 33 and the sleeve ring 35 are located above the embedding boundary line L1 (FIG. 10) and are operable from the outside.

  In the assembled state of FIG. 11A, the rotation of the valve body 31 is restricted by the abutment of the side tube portion 51 against the inner surface of the side through portion 45 (fitting holding portion 45d). Further, the contact of the guide cams 46 and 75 with respect to the insertion / removal direction surfaces 46b and 75b (see FIGS. 11A and 11B) and the contact between the one end portion of the rotation range restricting groove 73 and the rotation restricting projection 59. The contact (not shown) restricts the rotation of the sleeve ring 35 in the direction opposite to the removal direction F1 (FIG. 11B). Furthermore, resistance against rotation of the sleeve ring 35 in the removal direction F <b> 1 is imparted by the abutment of the lower protrusion 72 against the bottom surface 82 a (thin wall portion 84) of the concave portion 82 of the side tube portion 51. Accordingly, in the button unit 80, the valve body 31 is restricted from rotating in either the forward or reverse direction with respect to the cylinder 30, and the sleeve ring 35 is in a state where resistance is applied to the rotation in the removal direction F1.

  FIG. 2 shows the internal structure of the suction operation device 19 in the assembled state shown in FIG. In the suction operation device 19, a flow path in the insertion / removal direction is formed by the cylinder internal space 42 and the internal space 52, and a flow path in the radial direction is formed by the internal space 53.

  In a state where the button unit 80 is assembled to the cylinder 30, the side pipe portion 51 protrudes to the side of the operation portion 12 through the side through portion 45 (fitting holding portion 45 d). Although not specifically shown, the suction line 23 (FIG. 1) is connected to the suction source connection port 60 (FIGS. 2 and 3), and the suction force of the suction source 22 is transmitted through the suction line 23 to the internal space 53. Can be affected.

  When the piston 32 and the button 33 are not pressed, the suction operation device 19 is in the state shown in FIGS. 2 and 11A. In this state, the piston 32 and the button 33 receiving the urging force of the compression spring 34 increase the upward protrusion amount, and the movable valve 64 is pressed against the tapered inner surface 54 by the urging force of the compression spring 34. Held in position. The fluid flow between the cylinder inner space 42 and the inner space 52 is blocked by the movable valve 64 in the blocking position. On the other hand, a gap for leakage is formed between the outer peripheral wall portion 67 of the button 33 and the sleeve ring 35, or between the shaft portion 61 of the piston 32 and the inner peripheral surface of the insertion support portion 50. Due to the suction force acting on 53, the outside air is sucked from the leak gap.

  As shown in FIG. 3, when the piston 32 and the button 33 are pressed downward against the urging force of the compression spring 34, the movable valve 64 moves from the blocking position where it contacts the tapered inner surface 54 to the tapered inner surface 54. On the other hand, it moves to a communicating position that is spaced downward, so that the fluid in the cylinder space 42 and the inner space 52 can communicate with each other. On the other hand, the lower end surface of the central portion 65 of the button 33 closes the upper end of the inner space 52, and the flow of outside air into the inner space 52 from the gap between the button 33 and the sleeve ring 35 is blocked. Accordingly, the suction force of the suction source 22 reaches the suction pipe 16 via the internal space 53, the internal space 52, the cylinder internal space 42, and the pipe connection part 43, and suction from the suction port 18 can be performed. it can.

  When the pressure on the piston 32 and the button 33 is released, the piston 32 and the button 33 are moved upward by the urging force of the compression spring 34, and the movable valve 64 returns to the blocking position (FIG. 2) where it contacts the tapered inner surface 54. Thereby, the suction force from the suction source 22 does not reach the suction pipe 16 and the suction port 18.

  When a force (arrow F2 in FIG. 4) that pushes upward from below is applied to a portion of the side tube portion 51 that is on the tip side of the fragile portion 81, the side tube portion 51 is fragile. A bending load is applied in a direction in which the opposing surface 82b and the opposing surface 82c of the portion 81 are brought close to each other. The bridging portion 83 included in the fragile portion 81 has particularly high strength against such a compressive load in the longitudinal direction. And since it is the structure which arranged the some bridging part 83 extended in the extending direction of the side pipe part 51, intensity | strength is higher. In addition, the groove 85 can absorb the bending in the direction in which the opposing surface 82b and the opposing surface 82c are brought close to each other by narrowing the width of the V-shaped inner surface. Therefore, when the endoscope 10 is operated, the fragile portion 81 is not broken even if a slight load is applied to the side tube portion 51 (particularly, a load to be bent toward the arrow F2 in FIG. 4).

  In the suction operation device 19, the button unit 80 can be removed after the endoscope 10 is used, and the cylinder 30 and the suction conduit 16 can be cleaned and the button unit 80 can be replaced. The button unit 80 is removed by rotating the sleeve ring 35 in the removing direction F1 shown in FIG.

  As described above, when the sleeve ring 35 is rotated in the removal direction F1, resistance is received by the contact between the lower protrusion 72 and the concave portion 82 (bottom surface 82a) of the side tube portion 51. When a predetermined force or more is applied in the removal direction F1 against this resistance, the sleeve ring 35 starts to rotate while moving the lower protrusion 72 along the bottom surface 82a.

  The rotation of the sleeve ring 35 in the removal direction F1 changes the contact position of the inclined surface 75c of the guide cam 75 with respect to the inclined surface 46c of the guide cam 46, as shown in FIGS. . Each of the inclined surface 46c and the inclined surface 75c has an inclined shape that changes its position upward (withdrawal direction) as it advances in the removal direction F1, so that the sleeve ring 35 rotates in the removal direction F1 with respect to the cylinder 30. While moving up.

  Three guide cams 46 of the cylinder 30 and three guide cams 75 of the sleeve ring 35 are provided at different positions in the circumferential direction. Each guide cam 76 and each guide cam 75 generates an upward force by sliding contact between the inclined surface 46c and the inclined surface 75c that are substantially parallel to each other. Therefore, when the sleeve ring 35 is rotated, the sleeve ring 35 can be efficiently moved upward with high stability without causing an inclination.

  Due to the fitting relationship between the fitting recess 58 and the fitting protrusion 74, the valve body 31 moves upward together with the sleeve ring 35. In addition, the piston 32 and the button 33 move upward along with the valve body 31. That is, the entire button unit 80 moves upward. In the upward movement of the valve body 31, the side pipe portion 51 comes into contact with the narrow portion 45c and receives resistance. When the rotation of the sleeve ring 35 in the detaching direction F1 is continued against this resistance, as shown in FIGS. 12A and 13, the side pipe portion 51 made of a material having rigidity lower than that of the cylinder 30 is contracted. It passes through the narrow portion 45c while elastically deforming in the radial direction. When the side pipe part 51 completely passes through the narrow part 45c and enters the constant width part 45b, the movement resistance with respect to the side pipe part 51 is reduced, and the button unit 80 is moved upward through the upper end opening 30a of the cylinder 30. Can be pulled out.

  By removing the button unit 80 as described above, the inside of the suction conduit 16 and the cylinder 30 can be easily cleaned. In the button unit 80, the sleeve ring 35 is supported on the outer side of the outward projecting portion 56 projecting from the cylinder 30. The guide cam 46 for moving the sleeve ring 35 in the direction in which the button unit 80 is detached (upward) is an end face cam provided at the upper end portion of the cylinder 30. Therefore, no irregularities are formed on the inner circumferential surface of the cylinder 30 due to the provision of the sleeve ring 35, and the inside of the cylinder 30 has a smooth shape that is easy to clean (see FIGS. 2 and 3).

  The button unit 80 of the present embodiment is a type that is exchanged for each use. The button unit 80 removed from the cylinder 30 is discarded, and a new button unit 80 is attached to the cylinder 30 after the suction line 16 and the cylinder 30 are cleaned. When the button unit 80 is removed, the fragile portion 81 is destroyed as shown in FIG. 14, and it can be identified that it is in a state to be discarded after use.

  The fragile portion 81 is destroyed as follows. First, from the attached state of the button unit 80 shown in FIGS. 11 (A) and 11 (B), when the sleeve ring 35 rotates a predetermined amount in the removal direction F1, the lower protrusion 72 approaches each bridging portion 83 and makes contact. Touch. At this time, due to the relationship between the inclined surface 75c of the guide cam 75 and the inclined surface 46c of the guide cam 46, the lower projection 72 and each bridging portion 83 abut while the button unit 80 moves slightly upward. As shown in FIG. 8, since the downward protrusion amount of the lower protrusion 72 is larger than the depth Q1 (FIG. 8) of the concave portion 82 where the bridging portion 83 is provided, the button unit 80 is moved upward. In the state of rotating while moving, the lower protrusion 72 can be reliably brought into contact with all the bridging portions 83.

  As the sleeve ring 35 further rotates in the detaching direction F1, the lower protrusion 72 applies a shearing load to each of the bridging portions 83 having a thin and thin plate shape while pressing in the lateral width direction. When this shear load becomes a predetermined value or more, the bridging portions 83 are broken (see FIGS. 12A and 13). In particular, each bridging portion 83 partially has a narrow width portion 83 a having a small cross-sectional area, and therefore is easily broken by pressing of the lower protrusion 72. Further, the lower protrusion 72 causes the contact portions 72a (FIGS. 6, 8, and 13) having a thickness that decreases in the removal direction F <b> 1 to contact the bridging portions 83. Thereby, it is easy to apply a load for breaking from the lower protrusion 72 to each bridging portion 83.

  The strength of each bridging portion 83 is broken by the lower projection 72 when the sleeve ring 35 is rotated with the intention of removal, and the sleeve ring 35 wobbles (without the intention of removal) when the endoscope 10 is used. It is set so that it will not break. Such strength setting can be appropriately changed according to the cross-sectional shape and arrangement of each bridging portion 83. More specifically, the width of each bridging portion 83 in the direction of rotation of the sleeve ring 35 and the thickness of each bridging portion 83 in the radial direction of the side pipe portion 51 (the width of the bridging portion 83 and the gap 86). This can be realized by changing factors such as the size ratio) and the number and positions of the narrow portions 83a. For example, if the cross-sectional area (width or thickness) of each bridging portion 83 or each narrow width portion 83a is reduced, the force required for breaking is reduced. Further, increasing the number of narrow portions 83a in each bridging portion 83 or expanding the formation range of the narrow portions 83a also reduces the force required for breaking. Conversely, the cross-sectional area (width and thickness) of each bridging portion 83 is increased, the number of bridging portions 83 is increased, or the formation range of the narrow width portion 83a in each bridging portion 83 is reduced (or By not providing the narrow width portion 83a), a force necessary for breaking is increased.

  Further, on the premise that the strength of each bridging portion 83 can be ensured when the endoscope 10 is used, the abutting portion 72a is fitted to the side portion of each bridging portion 83 that faces the lower projection 72. A concave shape or the like is also possible. If it does in this way, a position when lower projection 72 is made to contact each bridge part 83 will become stable, and it will become easy to break each bridge part 83 efficiently.

  Instead of providing resistance against rotation in the removal direction F1 by contacting the lower protrusion 72 and the bottom surface 82a of the recess 82 in a state before the sleeve ring 35 is rotated, a gap between the valve body 31 and the sleeve ring 35 is provided. It is also possible to adopt a configuration in which the sleeve ring 35 is held by fitting a click stop mechanism provided in the. The click stop mechanism may be configured by changing the shapes of the lower protrusion 72 and the recess 82 (for example, adding a click recess on the recess 82 side and adding a click protrusion on the lower protrusion 72 side). Alternatively, it may be provided at a location different from the lower protrusion 72 and the recess 82. By rotating the sleeve ring 35 in the removal direction F <b> 1 with a predetermined force or more, the holding by the click stop mechanism is released, and the lower protrusion 72 can be brought into contact with each bridging portion 83.

  12A and 13 show the rotational position of the sleeve ring 35 in the middle of breaking the bridging portions 83 by the contact portions 72a of the lower protrusions 72. FIG. When the sleeve ring 35 rotates in the removal direction F1 (FIG. 11B) from the position shown in FIGS. 12A and 13, the lower protrusion 72 passes through the position of each bridging portion 83, and each bridging. The portion 83 is completely broken.

  As described above, when the button unit 80 is pulled upward from the cylinder 30, the side tube portion 51 having the fragile portion 81 contacts the narrow portion 45c and receives resistance. When the button unit 80 is moved upward against this resistance, the relationship between the insertion support portion 50 that is to be pulled upward together with the sleeve ring 35 and the side tube portion 51 that receives movement resistance by the narrow portion 45c. As a result, a load is applied to the proximal end portion of the side tube portion 51, that is, the fragile portion 81. Due to this load, the thin portion 84 is broken along the groove 85 in the recess 82 (see FIG. 14).

  More specifically, when each bridging portion 83 is broken by the rotation operation of the sleeve ring 35, the strength of the fragile portion 81 is weakened. In particular, each bridging portion 83 bridges the facing surface 82b and the facing surface 82c at a position corresponding to the portion where the thickness of the thin portion 84 is the smallest (see FIGS. 8 and 13). The breakage of the portion 83 greatly affects the strength reduction of the fragile portion 81. When the button unit 80 tries to move in the disengagement direction in this state, a force is exerted on the fragile portion 81 so as to bend the side tube portion 51 in a direction in which the gap between the facing surface 82b and the facing surface 82c of the recess 82 is increased. . Here, even in the thin portion 84 formed to be thin, stress concentrates on the portion where the groove portion 85 having a particularly small thickness is formed, and the bottom portion (V-shape) of the groove portion 85 having a V-shaped cross-sectional shape. The thin-walled portion 84 is broken along the top portion of the thin-walled portion 84.

  As shown in FIG. 4, in the radial direction of the button unit 80 centering on the axis X (FIGS. 2 and 3), the outermost diameter side portion (opposing surface 82c) of the fragile portion 81 is When the button unit 80 is inserted into the cylinder 30, the fragile portion 81 is formed by being configured to be located on the inner diameter side (side closer to the axis X) than the outer peripheral surface (the difference of S <b> 1 in FIG. 4 occurs). It is difficult to be destroyed, and the fragile portion 81 is easily destroyed when the button unit 80 is removed from the cylinder 30.

  As described above, the button unit 80 detached from the cylinder 30 is in a state where the weakened portion 81 is broken and the side tube portion 51 is bent (see FIG. 14). Thereby, it can be easily identified by appearance that the button unit 80 is in a state after use. In the structure of the present embodiment, the thin portion 84 is likely to be broken along the groove 85 as shown in FIG. 14, but the form of destruction of the fragile portion 81 is not limited to this. .

  As described above, in the suction operation device 19 of the present embodiment, the valve body 31 constituting the suction flow path is supported by the cylinder 30 in a state where the rotation is restricted, and is provided separately from the valve body 31. By rotating the sleeve ring 35, the button unit 80 including the valve body 31 is removed. The sleeve ring 35 is an annular body that surrounds the outward projecting portion 56 of the valve body 31, and has a portion that projects long in the radial direction, such as the side pipe portion 51 and the suction source connection port 60 of the valve body 31. Absent. Further, the sleeve ring 35 is not connected to an external device such as the suction conduit 23, and there is no possibility that a strong force is applied from the outside when the endoscope 10 is handled. Therefore, the sleeve ring 35 does not rotate unintentionally in the removal direction F1, and the assembled state of the button unit 80 can be reliably maintained when the endoscope 10 is used.

  Further, the sleeve ring 35 itself is also configured to receive resistance to rotation in the removal direction F <b> 1 by contact between the lower protrusion 72 and the side tube portion 51 (concave portion 82), and therefore the sleeve ring 35 is not intended. The rotation operation can be prevented, and the assembled state of the button unit 80 can be more reliably maintained.

  Further, as described above, the valve body 31 constituting the button unit 80 includes the fragile portion 81 that is destroyed by the removal operation from the cylinder 30. Since it is possible to identify that the button unit 80 has been used due to the destruction of the fragile portion 81, it is possible to reduce the possibility that the button unit 80 after being detached will be mounted again. The fragile portion 81 is not damaged by the operation when the button unit 80 is attached to the cylinder 30 (inserted downward), and the operation when the button unit 80 is removed from the cylinder 30 (rotation of the sleeve ring 35 and pulling upward). It is the structure damaged by. Therefore, the effect can be obtained only by performing normal attachment and detachment without requiring a complicated operation on the button unit 80.

  As mentioned above, although demonstrated based on illustration embodiment, this invention is not limited to specific embodiment. The present invention includes a support body (corresponding to the cylinder 30 of the embodiment) provided in the main body of the endoscope and a detachable body (corresponding to the button unit 80 of the embodiment) that can be attached to and detached from the support body. It is sufficient if it has a basic configuration that the detachable body is equipped with a fragile part that is not damaged by the mounting operation but is damaged by the removal operation from the support, and the structure of the details and the type of device to be applied can be arbitrarily selected. It is.

  For example, although the above embodiment is applied to the suction operation device 19, an operation device for air / water supply can also be applied. The air / water operating device has a valve structure whose opening and closing state is changed by an external pressing operation, like the relationship between the valve body 31 of the suction operating device 19 and the piston 32, and constitutes this valve structure. A configuration having a fragile portion as in the above embodiment can be used for attaching and detaching the portion to be performed.

  More specifically, the air / water supply operating device has an air / water supply button that can be pressed against a cylinder supported by the operation portion of the endoscope. In the endoscope, an air supply / water supply conduit that connects the nozzle and the cylinder provided at the distal end of the insertion portion, and an air supply conduit and a water supply conduit that connect the total air supply source and the cylinder are disposed. When the air supply / water supply button has a leak hole, and the air supply / water supply button is not touched (the leak hole is not blocked), the air sent from the air supply / water supply source to the cylinder via the air supply line passes through the leak hole. Exit outside. When the leak hole of the air / water supply button is closed with a finger or the like, air is supplied to the air / water supply conduit, and air can be ejected from the nozzle. Also, when the air / water supply button is not pushed in, the water supply from the water supply line to the air / water supply line is blocked, and when the air / water supply button is pushed in, the water supply line and the air / water supply line communicate with each other. Water can be spouted from. The nozzle is directed to the objective window provided in the forefront of the imaging lens system and the light distribution window provided in the foremost part of the illuminating means. After cleaning, air can be ejected from the nozzle to remove water droplets from the objective window and the light distribution window. In the air / water operating device that constitutes such an air / water supply system, a fragile portion may be provided in the button unit including the air / water supply button.

  Further, the present invention can be applied to an operation device other than a type of operation device that changes a fluid flow state by a pressing operation, such as a suction operation device 19 or an air / water supply operation device.

  When the present invention is applied to a detachable device other than such a suction operation device, the configuration and shape of the detachable body are different from the button unit 80 of the above-described embodiment. Therefore, the position where the fragile portion is provided and the form of the fragile portion can be arbitrarily changed according to the configuration of the detachable body. Specifically, the position where the weak portion is provided is not limited to the proximal end portion of the side pipe portion 51 protruding from the valve body 31 as in the embodiment, and the form of the weak portion is the weak portion of the embodiment. The part 81 may be different.

  If the fragile portion is broken stepwise by movements in a plurality of different directions (rotation of the sleeve ring 35 and extraction of the button unit 80) as in the above embodiment, there is a risk that unintentional breakage occurs. It is easy to satisfy the requirement of being destroyed only at the time of removal. However, this invention does not exclude the weak part of the form destroyed only by one operation | movement when removing a detachable body.

  For example, the direction of the load acting on the side pipe portion 51 differs between when the button unit 80 is inserted and when it is pulled out. Conditions such as the opening direction of the recess 82, the thickness and cross-sectional shape of the thin portion 84, and the cross-sectional shape and forming direction of the groove portion 85 are set so that the strength can be controlled according to the difference in the load direction in the insertion / removal direction. Thus, it is possible to obtain a fragile part that is completely destroyed only by movement in the pulling direction of the button unit 80 while satisfying the condition that the button unit 80 is not destroyed by the insertion operation. That is, the bridging portion 83 in the embodiment can be omitted, and a weak portion that does not require breakage due to rotation of the sleeve ring 35 at the time of breakage can be obtained. Conversely, it is also possible to adopt a type of fragile portion in which the breakage is completed only by the breakage caused by the rotation of the sleeve ring 35 and the operation in the pulling direction of the button unit 80 is not included in the breakage requirements.

DESCRIPTION OF SYMBOLS 10 Endoscope 11 Insertion part 12 Operation part 13 Universal tube 14 Video connector 15 Processor 16 Suction line (1st line)
18 Suction port 19 Suction operation device 22 Suction source 23 Suction line (second line)
27 Pushbutton switch 30 Cylinder (support)
30a Upper end opening 31 Valve body (main body member)
32 Piston (Pressing operation member)
33 button (pressing operation member)
34 Compression spring (biasing means)
35 Sleeve ring (detachment operation member)
40 Large diameter part (tubular part)
41 Small-diameter portion 42 Cylinder space (support body space)
43 Pipe connection part 44 Step part 45 Side penetration part 45a Introduction part 45b Constant width part 45c Narrow part (resistance provision part)
45d fitting holding part 46 guide cam 50 insertion support part (insertion part)
51 Side pipe (side protrusion)
52 Internal space (detachable internal space)
53 Internal space (detachable internal space)
54 Tapered inner surface 56 Outward projecting portion 57 Spring support groove 58 Fitting recess 59 Rotation restricting projection 60 Suction source connection port 61 Shaft portion 62 Head portion 63 Flange portion 64 Movable valve 65 Center portion 65a Retaining portion 66 Upper wall portion 67 Outer periphery Wall part 70 Grasping surface 71 Thick part 72 Lower projection (Destruction trigger part)
72a Contact part 73 Rotation range limiting groove 74 Fitting protrusion 75 Guide cam 80 Button unit (detachable body)
81 Fragile portion 82 Recessed portion 82a Bottom surface 82b Opposing surface (inner surface of recessed portion)
82c Opposing surface (inner surface of recess)
83 Bridge part (first destroyed part)
83a Narrow part 84 Thin part (second destroyed part)
85 Groove F1 removal direction

Claims (12)

A support provided on the main body of the endoscope;
A detachable body that is detachable from the support and functions in a mounted state;
A fragile portion provided on the detachable body, not broken by the mounting operation on the support, but destroyed by the detaching operation from the support;
An endoscope attachment / detachment device comprising: The support includes a support body space that opens to the outer surface side of the endoscope,
The removable body is
A body member that can be inserted into and removed from the support body space of the support;
A detachment operation member that is supported so as to be rotatable about an axis that faces the insertion / removal direction with respect to the main body member, and that imparts a moving force in the detachment direction from the support to the main body member by rotation in the removal rotation direction. When,
With
The weakened portion is provided in the main body member,
The endoscope attachment / detachment device according to claim 1, wherein the detachment operation member includes a destruction inducing portion that causes destruction of at least a part of the fragile portion by a rotation operation in the removal direction. The support is
A cylindrical part surrounding the support body space;
A side through portion that penetrates the inner and outer peripheral surfaces of the cylindrical portion and extends from the opening in the insertion direction of the body member;
With
The body member is
An insertion portion located inside the support body space in the mounted state;
A side protrusion that is connected to the insertion portion and protrudes outwardly of the tubular portion through the side through portion in the mounted state;
With
The fragile portion is formed in the side protrusion,
The endoscope attachment / detachment apparatus according to claim 2, further comprising a resistance applying unit that provides resistance to movement of the side protrusion in the insertion / removal direction at a position midway along the side penetration.   The endoscope attachment / detachment device according to claim 3, wherein the fragile portion is provided in a region located inside the side through portion in the mounted state in the side protrusion. The vulnerable part is
A first to-be-destructed part destroyed by the destruction inducing part of the detachment operation member;
In a state where the first fragile portion is destroyed, a second to-be-destructed portion destroyed by a load when the main body member moves in the separation direction against the resistance of the resistance applying portion,
The endoscope attachment / detachment device according to claim 3 or 4, further comprising: Each of the insertion portion and the side protrusion has a removable body space communicating with the support body space, and the side protrusion is a tubular body surrounding the removable body space,
The second destroyed portion includes a thin portion located at the bottom of a bottomed recess formed on the outer peripheral surface of the side protrusion,
The endoscope attachment / detachment device according to claim 5, wherein the first broken portion includes a bridging portion that bridges a pair of inner surfaces of the concave portions that are spaced apart and opposed in the extending direction of the tubular body.   The endoscope attachment / detachment device according to claim 6, wherein a plurality of the bridging portions are provided at intervals in a depth direction of the concave portion.   The endoscope attachment / detachment device according to claim 6 or 7, wherein the bridging portion has a cross-sectional area of a portion connected to at least one of the pair of inner surfaces of the concave portion smaller than a cross-sectional area of the other portion.   The endoscope attachment / detachment device according to any one of claims 6 to 8, wherein a groove portion extending in a circumferential direction of the tubular body is provided on a surface of the thin portion.   The endoscope attachment / detachment device according to any one of claims 6 to 9, wherein the concave portion is formed on an outer surface of the tubular body on a side facing the separation direction. A movable valve that is movably supported in the insertion / removal direction with respect to the main body member, and that moves between a blocking position that blocks fluid flow between the support body space and the removable body space and a communication position that allows fluid flow. A pressing operation member having
Biasing means for biasing the pressing operation member to the blocking position;
The endoscope attachment / detachment device according to any one of claims 6 to 10, further comprising:   A first conduit connected to the support body space; and a second conduit connected to the detachable body space via the lateral protrusion, wherein the first conduit is inserted into the endoscope. The endoscope attachment / detachment device according to claim 11, wherein the second conduit is connected to a suction source.

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