JP2014117333A - Valve for endoscope, and endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve for an endoscope which is not easily taken to pieces in use while it can be easily assembled and disassembled, and also not reusable.SOLUTION: When a valve body engagement part 177 engages with a return preventing engagement part 293, the valve body engagement part 177 engages with the return preventing engagement part 293 so that a piston 160 is regulated from moving in the advancing direction, in the axial direction of a button inner side surface 191. Therefore, an enlarged bottom part 163 is disabled from separating from an enlarged diameter side surface 175 of a valve body 170. That is, the piston 160 cannot be advanced into the valve body inner side surface 172 by pressing a button 190, so that a negative pressure nipple 124 and a suction pipe 239 cannot be connected. Thus, a valve 122 for an endoscope cannot be used.

Description

  The present invention relates to an endoscope valve that is provided in an endoscope and controls the flow of fluid, and an endoscope that includes the endoscope valve.

  The endoscope includes an air / water supply conduit for sending a liquid or gas to the distal end portion of the endoscope, or an intake conduit for sucking a desired object from the distal end portion of the endoscope. An endoscope valve is provided in the middle of the air / water supply conduit and the suction conduit to control the flow of fluid.

  The endoscope valve is mainly composed of a cylinder, a suction plug inserted inside the cylinder, and a piston inserted inside the suction plug. The cylinder, suction plug, and piston are designed to be disassembled for sterilization and maintenance. By engaging the convex portion provided on the outer peripheral surface of the suction plug with the engagement groove provided on the inner peripheral surface of the cylinder, the cylinder, the suction plug, and the piston are combined (Patent Document 1). Patent Document 2 discloses a suction device mainly composed of a valve casing corresponding to the cylinder of Patent Document 1, a valve guide member corresponding to a suction plug, and a valve member corresponding to a piston. These are combined by the same structure as what is disclosed in Patent Document 1. The suction plug is made of a deformable plastic member, and the convex portion moves to the engaging groove inside the cylinder by deforming the convex portion, the engaging groove, and the peripheral portion thereof. As a structure for disassembling the cylinder, the suction plug, and the piston, in Patent Document 1, when the suction plug is rotated with respect to the cylinder, the cam portion provided in the suction plug moves along the cam groove provided in the cylinder, As a result, the piston and the suction plug move in the direction of coming out of the cylinder, and the piston and the suction plug are removed from the cylinder. In Patent Document 2, the valve guide member is rotated with respect to the valve casing until the connecting pipe passes over the push operation switch, so that the positions of the retaining protrusion and the guide groove coincide with each other in the circumferential direction. The member is removed.

JP-A-5-95897 JP 2009-201845 A

  In the configuration described in the cited document 1, since the convex portion is fitted into the engaging groove, the entire suction plug having the convex portion or the convex portion must be formed of a deformable resin. Since the resin is softer than metal or the like, the strength of the suction plug or the convex portion is lowered. If the strength of the suction plug or convex part is low, the convex part may be shaved due to repeated attachment and detachment, resulting in a gap between the convex part and the engagement groove, or the suction plug may be deformed by the impact when dropped. Arise. Further, in the configuration described in the cited document 1, since the piston and the suction plug can freely rotate with respect to the cylinder, when a force in the rotation direction is applied to the base connected to the suction plug, the suction plug rotates and falls off the cylinder. There is a risk of it. Further, in the configuration described in the cited document 2, the positions of the retaining protrusion and the guide groove coincide with each other in use in the circumferential direction, and the valve guide member and the valve member may be detached from the valve casing.

  Furthermore, when these configurations are applied to a disposable endoscope valve, the endoscope valve can be attached to the endoscope and used again after the used endoscope valve is removed from the endoscope. When the used endoscope valve is reused, there is a risk that the endoscope valve may be deteriorated, or the subject may be injured due to poor disinfection / sterilization.

  The present invention has been made in view of these problems, and obtains an endoscope valve that can be easily assembled and disassembled but is not easily disassembled during use and cannot be reused. With the goal.

  The endoscope valve according to the first invention of the present application is provided with a cylindrical cylinder (140), a cylindrical valve body (170) inserted into the inner periphery of the cylinder, and capable of advancing and retreating on the inner periphery of the valve body. And a button (190) attached to one end of the piston in the advancing and retreating direction. The button includes a cylindrical button inner surface (191) and a button engaging portion (195) provided on the button inner surface. ), A button rotation engagement portion (291), a return prevention protrusion (292), and a return prevention engagement portion (293), and the cylinder is separated from the cylinder outer surface (142) which is the outer surface of the cylinder. A cylinder engaging portion (143) protruding outward in the radial direction is provided, and the button is attached to the cylinder so that the inner surface of the button slides with the outer surface of the cylinder. Engaging with the engaging portion, the valve body has a valve body engaging portion (177) protruding from the valve body outer surface (173), which is the outer surface of the valve body, toward the radially outer side of the valve body, The button rotation engagement portion (291), the return prevention protrusion (292), and the return prevention engagement portion (293) are provided so as to be arranged in the circumferential direction of the inner surface of the button, and the return prevention protrusion (292) The length of the return prevention engagement portion with respect to the axial direction of the button inner surface projects from the valve rotation engagement portion and the return prevention engagement portion toward the radially inner side of the button inner surface. When the cylinder engaging portion is engaged with the button engaging portion, the valve body engaging portion engages with the button rotation engaging portion, and the cylinder engaging portion When the valve deviates from the button engaging part, the valve body engaging part Characterized by engaging a return prevention engaging portion.

  When the valve main body engaging portion is engaged with the return preventing engaging portion, the valve main body engaging portion is engaged with the return preventing engaging portion in the axial direction of the inner surface of the button, and the piston moves in the entering direction. Is preferably regulated.

  A spring provided between the valve main body and the button, the spring biasing the valve main body and the button in directions opposite to each other with respect to the advancing and retreating direction of the piston, and the piston includes an end portion attached to the button; Has a widened portion (163) provided at the opposite end, and the width of the widened portion is longer than the width of the end attached to the button with respect to the advancing and retreating direction of the piston. When energized and engaged with the valve body, and the cylinder engaging portion is engaged with the button engaging portion, the widened portion can be separated from the valve body, and the valve body engaging portion is engaged with the return prevention. When engaged with the portion, the widened portion is preferably not separable from the valve body.

  In a cross section perpendicular to the axis of the button, the angle formed by the button rotation engagement portion and the return prevention protrusion is 90 degrees or more, and the angle formed by the return prevention engagement portion and the return prevention protrusion is 90 degrees or less. It is preferable.

  When the cylinder engaging portion is engaged with the button engaging portion, the valve body engaging portion is engaged with the button rotation engaging portion, and when the button is rotated in the circumferential direction of the inner surface of the button in this state, The valve body engaging part can enter the anti-return engaging part beyond the anti-return protrusion, and when the valve main body engaging part is engaged with the anti-return engaging part, When the is rotated, it is preferable that the valve body engaging portion cannot enter the button rotation engaging portion beyond the return prevention protrusion.

  The first force required for the valve body engagement portion to exceed the return prevention protrusion from the button rotation engagement portion is the second force required for the valve body engagement portion to exceed the return prevention protrusion from the return prevention engagement portion. It is preferable that it is smaller than the force.

  The button rotation engagement portion is preferably a groove having a length longer than the length in which the piston advances and retreats with respect to the piston advancing and retreating direction.

  The button includes a button engagement groove (197) provided on the inner surface of the button and extending from the button engagement portion along the circumferential direction of the button inner surface. The depth of the button engagement groove is the circumferential direction of the button inner surface. When the button is rotated in the circumferential direction of the inner surface of the button, the cylinder engaging portion engages with the button engaging groove, and at least a part of the cylinder engaging portion is When the button engagement portion and the button engagement groove are deviated, the valve body engagement portion is preferably engaged with the return prevention engagement portion.

  The button preferably has a pressing surface (193) provided so as to close one end of the cylindrical shape of the button, and the piston is preferably attached to the piston by fitting with a button hole (194) opened in the pressing surface. .

  An endoscope according to a second invention of the present application is characterized by including the endoscope valve.

  According to the present invention, an endoscope valve that can be easily assembled and disassembled but is not easily disassembled during use and cannot be reused is obtained.

It is the figure which showed the endoscope by this invention. It is sectional drawing of the valve | bulb for endoscopes in the II-II line | wire of FIG. It is the perspective view which looked at the cylinder from the front right upper part. It is the perspective view which looked at the cylinder from the back upper left. It is the perspective view which looked at the valve body from the front right upper part. It is the perspective view which looked at the piston from the front right upper part. It is the perspective view which looked at the button from the front upper right. It is the perspective view which looked at the button from the back lower right. It is the perspective view which looked at the button from the front right lower part. It is sectional drawing which showed the state when pushing a piston with respect to a cylinder. It is the figure which showed the process of putting a compression coil spring in the spring groove | channel of a valve body. It is the figure which showed the process of attaching a piston to a button. It is the figure which showed the process of assembling a button, a piston, a compression coil spring, and a valve body. It is the figure which showed the state which attached the cylinder to the operation part. It is the figure which showed the process of inserting a button, a piston, a compression coil spring, and a valve body into a cylinder. It is the figure which showed the process of inserting a valve main body in a button. It is the figure which showed the process of inserting a valve main body in a button. It is the figure which showed the process of inserting a valve main body in a button. It is the figure which showed the state in which the button, piston, compression coil spring, valve body, and cylinder were assembled. It is the figure which showed the state in which the button, the piston, the compression coil spring, the valve body, and the cylinder were attached to the operation unit. It is the perspective view which showed the state in which the button, piston, compression coil spring, valve | bulb main body, and cylinder were attached to the operation part. It is sectional drawing of the valve | bulb for endoscope in the XXII-XXII line | wire of FIG. It is sectional drawing of the valve | bulb for endoscope in the XXII-XXII line | wire of FIG. It is sectional drawing of the valve | bulb for endoscope in the XXII-XXII line | wire of FIG. It is a partial cross section figure of the valve | bulb for endoscopes. It is the figure which showed the state from which the button, the piston, the compression coil spring, and the valve body were removed from the cylinder.

  An endoscope 100 according to an embodiment of the present invention will be described.

  First, the endoscope 100 will be described with reference to FIG. The endoscope 100 mainly includes an insertion unit 110 that is inserted into the body of a subject, an operation unit 120 that is held by an operator, and a connector 130 that connects an endoscope processor (not shown) and the endoscope 100. . A universal cable 131 connects the connector 130 and the operation unit 120.

  A CCD unit, a suction port, an illumination lens, and the like (not shown) are provided at the distal end of the insertion unit 110. A signal line (not shown) is connected to the CCD unit. The CCD unit transmits an image signal obtained by imaging the observation object to the connector 130 via a signal line. A suction pipe 239 (see FIG. 2) is connected to the suction port. The suction pipe 239 extends to the operation unit 120 along the inside of the insertion unit 110. The illumination lens is a lens that emits illumination light to illuminate the observation object, and an illumination fiber extending from the connector 130 is connected thereto.

  The operation unit 120 includes a forceps port 121, an endoscope valve 122, and an operation switch 123. The forceps port 121 is connected to the suction tube 239. The endoscope valve 122 is attached to a valve hole 127 (see FIG. 2) formed in the operation unit 120. The forceps inserted into the forceps port 121 are carried along the inside of the suction tube 239 to the distal end. The endoscope valve 122 is a valve that supplies a negative pressure to the suction port by being pushed down, and a negative pressure nipple 124 is connected to the endoscope valve 122. A negative pressure pipe (not shown) is connected to the negative pressure nipple 124 to supply a negative pressure to the endoscope valve 122. When the endoscope valve 122 is pushed down, the negative pressure nipple 124 and the suction pipe 239 are connected, and negative pressure is supplied from the negative pressure nipple 124 to the suction port. Details of the endoscope valve 122 will be described later. The operation switch 123 is used to operate the endoscope 100 and the endoscope processor.

  The connector 130 has a signal terminal 132 connected to an endoscope processor (not shown) and an illumination terminal 133 connected to an illumination unit (not shown). The signal terminal 132 is connected to a signal line in the connector 130, and transmits an image signal from the CCD unit to the endoscope processor. The illumination terminal 133 is connected to the illumination fiber in the connector 130 and transmits illumination light to the illumination lens.

  Next, the endoscope valve 122 will be described in detail with reference to FIGS.

  The endoscope valve 122 mainly includes a cylinder 140, a piston 160, a valve body 170, a button 190, and a compression coil spring 233.

  The cylinder 140 will be described with reference to FIGS. The cylinder 140 has a bottomed cylindrical shape, and includes a cylinder opening 144 that forms an opening end of the cylinder 140, a cylinder inner surface 141, a cylinder outer surface 142, a cylinder engaging portion 143, and a negative pressure hole 146. Prepare for.

  The cylinder inner surface 141 is a cylindrical curved surface whose diameter gradually decreases from the cylinder opening 144 to the bottom, and the valve main body 170 and the piston 160 are inserted therein.

  The cylinder outer surface 142 located on the bottom side of the cylinder 140 is fitted through a valve hole 127 provided in the operation unit 120 and is engaged with a stopper tube 126 provided inside the operation unit 120. As a result, the cylinder 140 is fixed to the operation unit 120. An O-ring 234 is provided between the cylinder outer surface 142 and the valve hole 127 to ensure airtightness between the outside and the inside of the operation unit 120. The cylinder outer surface 142 located on the cylinder opening 144 side protrudes from the valve hole 127 to the upper side in the axial direction of the valve hole 127. A cylinder engaging portion 143 protrudes from a portion of the cylinder outer surface 142 close to the cylinder opening 144 toward the radially outer side of the cylinder 140. The cylinder 140 has a U-shaped groove 145 that penetrates from the cylinder inner surface 141 to the cylinder outer surface 142. The negative pressure nipple 124 is accommodated in the U-shaped groove 145. A suction pipe 239 extending from the suction port is connected to the negative pressure hole 146.

  The valve body 170 will be described with reference to FIGS. The valve main body 170 has a cylindrical shape, and the negative pressure nipple 124 and the valve main body engaging portion 177 protrude from the side surface of the cylinder. The valve main body 170 includes a valve main body inner surface 172 that is a cylindrical inner surface, a valve main body outer surface 173 that is a cylindrical outer surface, a valve main body rib 174 that protrudes from one end of the valve main body outer surface 173, A diameter-enlarging side surface 175 provided at the lower end of the body side surface 172 and a spring groove 176 formed on the upper end surface of the valve body 170 are provided. The valve body outer surface 173 has a cylindrical shape and is inserted into the cylinder inner surface 141. A piston 160 is inserted into the valve body inner side surface 172 so as to freely advance and retract. The valve body rib 174 protrudes at a right angle from the upper end of the valve body outer surface 173 toward the radially outer side of the valve body 170.

  The valve body engaging portion 177 protrudes at a right angle from the tip of the valve body rib 174 toward the radially outer side of the valve body 170, that is, protrudes at a right angle from the valve body 170 toward the radially outer side of the valve body 170. In a cross section perpendicular to the axis of the valve main body 170, the valve main body engaging portion 177 has a substantially trapezoidal cross section. More specifically, in the cross section perpendicular to the axis of the valve main body 170, two portions where the outer peripheral surface of the valve main body rib 174 and the valve main body engaging portion 177 contact each other form different angles. That is, the protrusion that moves toward the valve main body engaging portion 177 along the outer peripheral surface of the valve main body rib 174 forms an angle that can easily exceed the valve main body engaging portion 177. This angle is greater than 90 degrees, for example 135 degrees. On the other hand, the protrusion that moves toward the valve main body engaging portion 177 along the outer peripheral surface of the valve main body rib 174 forms an angle that does not easily exceed the valve main body engaging portion 177. This angle is 90 degrees or less, for example, 90 degrees.

  The valve body 170 is inserted into the cylinder 140 until the valve body rib 174 engages with the cylinder opening 144. The enlarged diameter side surface 175 is a frustoconical curved surface whose diameter increases from the inner side surface 172 of the valve body toward the lower side in the axial direction. A part of a piston 160 described later engages with the enlarged diameter side surface 175. A compression coil spring 233, which will be described later, is stored in the spring groove 176 so as not to move in the radial direction.

  The piston 160 will be described with reference to FIGS. The piston 160 has a substantially cylindrical shape, and includes a piston engaging portion 161, a sliding surface 162, and a bottom expanded portion 163 that are provided from the upper side to the lower side in FIG. The piston engaging portion 161 is provided with a piston groove 164, and the piston groove 164 engages with a button 190 described later. The sliding surface 162 is inserted into the valve body inner surface 172, and fluid flows between the fluid groove 165 carved in the sliding surface 162 and the valve body inner surface 172. The widened portion 163 is provided at a lower portion of the sliding surface 162, and has a truncated cone-shaped curved surface whose diameter increases from the connecting portion with the sliding surface 162 toward the lower side in the axial direction. The diameter of an arbitrary portion of the widened portion 163 is longer than the diameter of the piston engaging portion 161. The expanded bottom portion 163 engages with the expanded diameter side surface 175 of the valve body 170.

  The button 190 will be described with reference to FIGS. 2 and 7-9. The button 190 is formed of an elastically deformable member such as polyethylene or polypropylene. The button 190 includes a cylindrical button inner surface 191 and a button outer surface 192, a pressing surface 193 that closes the upper part of the cylindrical shape, a button hole 194 that is a circular hole that opens at the center of the pressing surface 193, and the button outer surface 192 A button engagement portion 195 and a vent hole 196 provided so as to penetrate the side surface 191 and a button engagement groove 197 provided on the button inner surface 191 are mainly provided.

  The button hole 194 is a tubular hole extending downward from the pressing surface 193 along the button inner surface 191, and the button engagement protrusion 198 projects from the inner peripheral surface thereof. When the piston 160 is inserted into the button hole 194, the inner peripheral surface of the button hole 194 engages with the piston engaging portion 161, and the button engaging protrusion 198 engages with the piston groove 164. Thereby, the piston 160 is fixed to the button 190.

  The button engaging portion 195 is a rectangular hole. The length of the button engaging portion 195 with respect to the advancing / retreating direction of the piston 160 is equal to or longer than the length by which the piston 160 moves back and forth in the main body of the cylinder 140. As will be described later, when the button 190 is attached to the cylinder 140, the cylinder engaging portion 143 enters and engages with the button engaging portion 195.

  The button engagement groove 197 is a groove extending from the button engagement portion 195 along the circumferential direction of the button inner surface 191. The depth of the button engagement groove 197 becomes shallower as the button engagement groove 195 moves away from the button engagement portion 195 along the circumferential direction of the button inner surface 191. More specifically, the connection portion with the button engaging portion 195 is the deepest, that is, substantially the same as the distance from the button outer surface 192 to the button inner surface 191, and the button engagement with the circumferential direction of the button inner surface 191. The portion farthest from the joint portion 195 is zero, that is, flush with the button inner surface 191. Thereby, when the button 190 is rotated in the circumferential direction with respect to the cylinder 140, the cylinder engaging portion 143 engaged with the button engaging portion 195 deviates from the button engaging portion 195 and reaches the button inner surface 191. Easily moved. The position of the button engagement groove 197 with respect to the axial direction of the button 190 is the lowermost part of the button engagement portion 195 in FIG. 8, and the length of the button engagement groove 197 with respect to the axial direction of the button 190 is the cylinder engagement portion 143. Slightly longer than that.

  The ventilation hole 196 is a hole for physically connecting the inside and the outside of the endoscope valve 122. The fluid inside the endoscope valve 122 flows out or flows into the outside through the vent hole 196.

  The button 190 includes a button rotation engagement portion 291, a return prevention protrusion 292, and a return prevention engagement portion 293 that are arranged in the circumferential direction of the button inner surface 191. The button rotation engagement portion 291 and the return prevention engagement portion 293 are recessed portions provided on the button inner surface 191. A return prevention projection 292 is provided between the button rotation engagement portion 291 and the return prevention engagement portion 293, and the length of the return prevention projection 292 protruding from the bottom surface of the recess is the depth of the recess with respect to the radial direction of the button 190. They are about the same length.

  In the cross section perpendicular to the axis of the button 190, the angle formed by the button rotation engagement portion 291 and the return prevention protrusion 292 is from the circumferential direction of the button 190 to the return prevention protrusion 292 via the button rotation engagement portion 291. The angle is such that the protrusion that moves can easily exceed the return prevention protrusion 292. This angle is 90 degrees or more, for example, 135 degrees. In a cross section perpendicular to the axis of the button 190, the angle formed by the return prevention engagement portion 293 and the return prevention projection 292 is from the circumferential direction of the button 190 to the return prevention projection 292 via the return prevention engagement portion 293. The angle is such that the protrusion that moves in this manner does not exceed the return prevention protrusion 292. This angle is 90 degrees or less, for example, 90 degrees. In other words, the first force necessary for the valve body engaging portion 177 to exceed the return prevention protrusion 292 from the button rotation engaging portion 291 is that the valve body engaging portion 177 returns from the return prevention engaging portion 293. Less than the second force required to exceed the prevention protrusion 292.

  The length of the button rotation engagement portion 291 in the forward / backward direction of the piston 160, that is, the axial direction of the button 190 is slightly longer than the length in which the piston 160 advances / retreats. Further, the length of the return preventing engagement portion 293 in the axial direction of the button 190 is such a length that the piston 160 cannot enter the valve main body 170. That is, when the valve main body engaging portion 177 is engaged with the return prevention engaging portion 293, the valve main body engaging portion 177 is engaged with the return prevention engaging portion 293 in the axial direction of the button inner surface 191. The piston 160 is restricted from moving in the direction of entry.

  Referring to FIG. 2, a compression coil spring 233 is provided between the back surface 199 of the pressing surface 193 and the spring groove 176 of the valve body 170. The compression coil spring 233 urges the valve body 170 and the button 190 in directions opposite to each other with respect to the advancing / retreating direction of the piston 160. Accordingly, the button 190 and the piston 160 are urged upward in FIG. 2 along the forward / backward direction of the piston 160, and the valve body 170 is urged downward in FIG. 2 along the forward / backward direction of the piston 160. Since the expanded portion 163 of the piston 160 is pressed against the expanded diameter side surface 175 of the valve body 170 by the force of the compression coil spring 233, the button 190, the piston 160, and the valve body 170 are not separated.

  Next, the configuration of the endoscope valve 122 when the button 190 is not pressed will be described with reference to FIG. When the user is not pressing the button 190, the button 190 is urged upward in the axial direction by the compression coil spring 233. Thereby, the piston 160 connected to the button 190 is held upward in the axial direction. At this time, the expanded bottom portion 163 of the piston 160 is in close contact with the expanded diameter side surface 175 of the valve body 170, and airtightness is ensured between the expanded bottom portion 163 and the expanded diameter side surface 175. Thereby, the negative pressure nipple 124 and the suction pipe 239 are not connected, and the negative pressure flowing from the negative pressure nipple 124 to the inside of the valve body 170 does not flow into the suction pipe 239.

  Next, the configuration of the endoscope valve 122 when the button 190 is pushed down will be described with reference to FIG. When the user pushes down the button 190, the piston 160 connected to the button 190 is pushed down in the axial direction. At this time, the cylinder engaging portion 143 slides inside the button engaging portion 195. When the button 190 is pushed down until the compression coil spring 233 is completely contracted, the bottom expanded portion 163 of the piston 160 moves away from the expanded diameter side surface 175 of the valve body 170, and a space is formed between the expanded bottom portion 163 and the expanded diameter side surface 175. Can be opened. Then, the fluid flows between the fluid groove 165 carved in the sliding surface 162 and the valve body inner surface 172. As a result, the negative pressure nipple 124 and the suction pipe 239 are connected, and negative pressure flows into the suction pipe 239 from the negative pressure nipple 124 through the inside of the valve body 170. Further, at this time, the upper part of the sliding surface 162 and the upper part of the valve body inner side surface 172 are in contact with each other, and airtightness between the piston 160 and the valve body 170 is ensured. As a result, the suction pipe 239 and the negative pressure nipple 124 are not released to the atmosphere, and the negative pressure flowing into the suction pipe 239 and the negative pressure nipple 124 does not flow out of the endoscope valve 122. That is, an object that is inhaled at the distal end portion of the endoscope and carried to the endoscope valve 122 through the suction pipe 239 does not leak out of the endoscope valve 122.

  Next, means for assembling the button 190, the piston 160, the valve body 170, and the compression coil spring 233 will be described with reference to FIGS.

  First, referring to FIG. 11, the compression coil spring 233 is placed in the spring groove 176 of the valve body 170.

  Next, referring to FIG. 12, the piston 160 is inserted from the lower side of the valve body 170 to the inner surface 172 of the valve body, and the button 190 is covered from the upper side of the valve body 170 to the outer side surface 173 of the valve body.

  Next, referring to FIG. 13, the piston 160 is inserted into the button hole 194, the inner peripheral surface of the button hole 194 is engaged with the piston engaging portion 161, the button engaging protrusion 198 is engaged with the piston groove 164, The valve main body engaging portion 177 is engaged with the button rotation engaging portion 291. Thereby, the piston 160 is fixed to the button 190. The button 190, the piston 160, the valve body 170, and the compression coil spring 233 are connected to each other. At this time, since the length of the button rotation engaging portion 291 with respect to the axial direction of the button 190 is slightly longer than the length of the piston 160 moving forward and backward, the button 190 and the piston 160 can move forward and backward in the axial direction with respect to the valve body 170. It is. When the button 190 and the piston 160 are pushed into the valve main body 170, the bottom expanded portion 163 of the piston 160 is separated from the diameter-enlarged side surface 175 of the valve main body 170. On the other hand, when the force that pushes the button 190 and the piston 160 into the valve main body 170 is released, the expanded bottom portion 163 of the piston 160 engages with the enlarged diameter side surface 175 of the valve main body 170.

  Next, means for attaching the button 190, the piston 160, the valve body 170, and the compression coil spring 233 to the cylinder 140 will be described with reference to FIGS.

  First, referring to FIG. 14, the cylinder 140 is already attached to the operation unit 120. The cylinder engaging portion 143 is provided at a position facing the operation switch 123. In this state, the button 190, the piston 160, the valve main body 170, and the compression coil spring 233 are inserted into the cylinder inner surface 141. FIG. 15 shows a state before the cylinder 140 is removed from the operation unit 120 for the sake of explanation, and before the button 190, the piston 160, the valve main body 170, and the compression coil spring 233 are inserted into the cylinder 140. As described above, the negative pressure nipple 124 is housed in the U-shaped groove 145, and the button engagement portion 195 is engaged with the cylinder engagement portion 143. The positional relationship between the negative pressure nipple 124 and the cylinder engaging portion 143 is fixed. Therefore, the user inserts the valve body 170 into the cylinder inner surface 141 while adjusting the position of the button engaging portion 195 in the circumferential direction by rotating the button 190 after the negative pressure nipple 124 is accommodated in the U-shaped groove 145. There is a need. That is, the button 190, the piston 160, the valve body 170, and the compression coil spring 233 can be attached to the cylinder 140 only when the positional relationship between the negative pressure nipple 124 and the button engaging portion 195 is within a predetermined range. In other words, the button 190, the piston 160, the valve body 170, and the compression coil spring 233 cannot be attached to the cylinder 140 unless the positional relationship between the negative pressure nipple 124 and the button engaging portion 195 is within a predetermined range. .

  Next, referring to FIG. 16, the valve body 170 is inserted into the cylinder inner surface 141.

  Next, referring to FIG. 17, the button 190 is advanced toward the cylinder 140 so as to cover the cylinder opening 144. When the button 190 is advanced to some extent, the button inner surface 191 hits the cylinder engaging portion 143 and deforms. As described above, since the button 190 is formed of a material that is easily elastically deformed, the user can easily advance the button 190 relative to the cylinder 140.

  Next, referring to FIG. 18, the cylinder engaging portion 143 enters and engages with the button engaging portion 195. Accordingly, the button 190 is restricted from moving upward in the axial direction with respect to the cylinder 140, and the button 190, the piston 160, the valve body 170, and the compression coil spring 233 are attached to the cylinder 140.

  Next, referring to FIGS. 19-21, a button 190, a piston 160, a valve body 170, a compression coil spring 233, and a cylinder 140 are attached to the operation unit 120. At this time, the button engagement portion 195 and the cylinder engagement portion 143 are provided at positions facing the operation switch 123.

  Next, means for removing the button 190, the piston 160, the valve body 170, and the compression coil spring 233 from the cylinder 140 will be described with reference to FIGS.

  FIG. 22 shows a state where the button 190, the piston 160, the valve body 170, and the compression coil spring 233 are attached to the cylinder 140. A cylinder engaging portion 143 enters and engages with the button engaging portion 195. Further, the valve body engaging portion 177 enters and engages with the button rotation engaging portion 291.

  FIG. 23 shows a state in which the user has rotated the button 190 clockwise from the state of FIG. The cylinder engaging portion 143 moves from the button engaging portion 195 to the button engaging groove 197 and advances toward the button inner surface 191. In this state, since a part of the cylinder engaging portion 143 is caught with a part of the button engaging groove 197 with respect to the axial direction of the button 190, the button 190, the piston 160, the valve main body 170, and the compression coil spring 233. Cannot escape from the cylinder 140. As described above, the position of the button engagement groove 197 with respect to the axial direction of the button 190 is the lowermost portion of the button engagement portion 195, so that when the button 190 is pushed into the cylinder 140, the button 190 The button 190 rotates relative to the cylinder 140 only when the button 190 is not pushed into the cylinder 140. Further, since the button 190 is formed of a material that is easily elastically deformed as described above, the user can easily rotate the button 190 with respect to the cylinder 140.

  When the cylinder engaging portion 143 moves from the button engaging portion 195 to the button engaging groove 197, the valve body engaging portion 177 abuts against the return prevention protrusion 292. As described above, in the cross section perpendicular to the axis of the valve main body, the two portions where the outer peripheral surface of the valve main body rib 174 and the valve main body engaging portion 177 contact each other form different angles. Here, it is a surface having a larger angle, for example, 135 degrees, that strikes the return prevention protrusion 292. On the other hand, as described above, the angle formed by the button rotation engagement portion 291 and the return prevention protrusion 292 is an angle such that the valve body engagement portion 177 can easily exceed the return prevention protrusion 292, for example, 135 degrees. Both the valve main body engaging portion 177 and the return prevention protrusion 292 have an angle of about 135 degrees. Therefore, when the user further rotates the button 190 clockwise, the valve body engaging portion 177 can easily exceed the return prevention protrusion 292.

  FIG. 24 shows a state where the button 190 is further rotated clockwise from the state of FIG. When the cylinder engaging portion 143 exits the button engaging groove 197 and moves to the button inner surface 191, the connection between the button 190 and the cylinder 140 is released, so the button 190, the piston 160, the valve body 170, and the compression coil spring 233. Comes off the cylinder 140 (see FIG. 26). At this time, if at least a part of the cylinder engaging portion 143 deviates from the button engaging portion 195 and the button engaging groove 143, the connection between the button 190 and the cylinder 140 is released.

  On the other hand, the valve main body engaging portion 177 easily moves beyond the return prevention protrusion 292 to the return prevention engagement portion 293. When the button 190 is rotated counterclockwise with respect to the valve main body 170 in this state, the valve main body engaging portion 177 abuts against the return prevention protrusion 292. As described above, in the cross section perpendicular to the axis of the valve main body 170, the two portions where the outer peripheral surface of the valve main body rib 174 and the valve main body engaging portion 177 contact each other form different angles. Here, it is a surface having a smaller angle, for example, 90 degrees, that strikes the return prevention protrusion 292. On the other hand, as described above, the angle formed by the button rotation engagement portion 291 and the return prevention protrusion 292 is an angle such that the valve body engagement portion 177 cannot easily exceed the return prevention protrusion 292, for example, 90 degrees. . Both the valve body engaging portion 177 and the return prevention protrusion 292 have an angle of about 90 degrees. Therefore, when the user rotates the button 190 counterclockwise, the valve body engaging portion 177 abuts against the return prevention protrusion 292 and cannot be exceeded. That is, the button 190, the piston 160, the valve body 170, and the compression coil spring 233 are detached from the cylinder 140, while the button 190 and the piston 160 cannot rotate with respect to the valve body 170. As described above, the button 190, the piston 160, the valve body 170, and the compression coil spring 233 are attached to the cylinder 140 only when the positional relationship between the negative pressure nipple 124 and the button engaging portion 195 is within a predetermined range. Can do. However, in a state where the valve main body engaging portion 177 is positioned at the return prevention engaging portion 293, the positional relationship between the negative pressure nipple 124 and the button engaging portion 195 is fixed at a position deviated from a predetermined range. The button 190, the piston 160, the valve body 170, and the compression coil spring 233 cannot be attached to the cylinder 140. Further, when the valve main body engaging portion 177 is engaged with the return prevention engaging portion 293, the valve main body engaging portion 177 is engaged with the return prevention engaging portion 293 in the axial direction of the button inner surface 191. The movement of the piston 160 in the approach direction is restricted (see FIG. 25). Therefore, the expanded bottom portion 163 cannot be separated from the expanded diameter side surface 175 of the valve body 170. That is, the button 190 cannot be pressed to allow the piston 160 to enter the valve body inner surface 172, and the negative pressure nipple 124 and the suction pipe 239 cannot be connected. As a result, the endoscope valve 122 becomes unusable.

  According to this embodiment, once the button 190, the piston 160, the valve body 170, and the compression coil spring 233 are removed from the cylinder 140, they cannot be attached again. Therefore, it is possible to prevent the endoscope valve 122 from being repeatedly used.

  Further, the button 190, the piston 160, and the valve main body 170 can be easily assembled to the cylinder 140 only by inserting the cylinder 140 into the button 190. Further, even if the hose connected to the negative pressure nipple 124 moves, a force that removes the cylinder engaging portion 143 and the button engaging portion 195 is not applied to these engaging portions, so that the button 190, the piston 160, The valve body 170 and the cylinder 140 are not easily detached. Furthermore, the button 190, the piston 160, and the valve body 170 can be easily detached from the cylinder 140 by the action of the button engaging groove 197.

  Further, since the button engaging portion 195 is provided so as to face the operation switch 123, the user's finger touches the button engaging portion 195 during use, and the cylinder engaging portion 143 is detached from the button engaging portion 195. There is nothing.

  The button engaging portion 195 does not need to penetrate from the button outer surface 192 to the button inner surface 191, and may be a groove formed in the button inner surface 191.

  The button rotation engagement portion 291 and the return prevention engagement portion 293 do not have to be concave portions, and may be holes that penetrate from the button inner surface 191 to the button outer surface 192.

  Further, the shapes of the button 190, the piston 160, the valve main body 170, and the cylinder 140 are not limited to a cylindrical shape.

DESCRIPTION OF SYMBOLS 100 Endoscope 110 Insertion part 120 Operation part 121 Forceps port 122 Endoscope valve 123 Operation switch 124 Negative pressure nipple 126 Stop pipe 127 Valve hole 130 Connector 131 Universal cable 132 Signal terminal 133 Illumination terminal 140 Cylinder 141 Cylinder inner surface 142 Cylinder outer surface 143 Cylinder engaging portion 144 Cylinder opening portion 145 U-shaped groove 146 Negative pressure hole 160 Piston 161 Piston engaging portion 162 Sliding surface 163 Expanded bottom portion 164 Piston groove 165 Fluid groove 170 Valve body 172 Valve body inner side surface 173 Valve body Outer side surface 174 Valve body rib 175 Expanded side surface 176 Spring groove 177 Valve body engaging portion 190 Button 191 Button inner surface 192 Button outer surface 193 Press surface 194 Button hole 195 Button Engaging portion 196 vents 197 button engagement groove 198 button engaging projection 199 back surface 234 O-ring 239 suction pipe 291 buttons rotational coupling section 292 returns prevention protrusion 293 anti-return engagement portion

Claims (10)

A cylindrical cylinder;
A cylindrical valve body inserted into the inner periphery of the cylinder;
A piston provided so as to be capable of advancing and retreating on the inner periphery of the valve body;
A button attached to one end of the piston in the advancing and retracting direction,
The button has a cylindrical button inner surface, a button engagement portion provided on the button inner surface, a button rotation engagement portion, a return prevention protrusion, and a return prevention engagement portion,
The cylinder has a cylinder engaging portion that protrudes from the cylinder outer surface, which is the outer surface of the cylinder, toward the radially outer side of the cylinder,
The button is attached to the cylinder so that the inner surface of the button slides with the outer surface of the cylinder, the cylinder engaging portion engages with the button engaging portion,
The valve body has a valve body engaging portion that protrudes from a valve body outer surface that is an outer surface of the valve body toward a radially outer side of the valve body,
The button rotation engagement portion, the return prevention protrusion, and the return prevention engagement portion are provided so as to be aligned with respect to a circumferential direction of the button inner surface,
The return prevention protrusion protrudes radially inward of the button inner surface from between the button rotation engagement part and the return prevention engagement part,
The length of the return preventing engagement portion with respect to the axial direction of the inner surface of the button is such a length that the piston cannot enter the valve body,
When the cylinder engaging portion is engaged with the button engaging portion, the valve body engaging portion is engaged with the button rotation engaging portion, and the cylinder engaging portion deviates from the button engaging portion. When this is done, the valve main body engaging portion engages with the return prevention engaging portion.   When the valve body engagement portion is engaged with the return prevention engagement portion, the valve body engagement portion is engaged with the return prevention engagement portion in the axial direction of the inner surface of the button, and The endoscope valve according to claim 1, wherein movement of the piston in the direction of entry is restricted. A spring provided between the valve body and the button, the spring biasing the valve body and the button in directions opposite to each other with respect to the advancing and retreating direction of the piston;
The piston has a widened portion provided at an end opposite to an end portion attached to the button, and the width of the widened portion is an end portion attached to the button with respect to a forward / backward direction of the piston. Longer than the width of the bottom, the widened portion is urged by the spring to engage the valve body,
When the cylinder engaging portion is engaged with the button engaging portion, the bottom expanded portion can be separated from the valve main body, and the valve main body engaging portion is engaged with the return preventing engaging portion. The endoscope valve according to claim 1, wherein the widened portion cannot be separated from the valve body.   In a cross section perpendicular to the axis of the button, the angle formed by the button rotation engagement portion and the return prevention protrusion is 90 degrees or more, and the angle formed by the return prevention engagement portion and the return prevention protrusion is The endoscope valve according to any one of claims 1 to 3, wherein the angle is 90 degrees or less. When the cylinder engaging portion is engaged with the button engaging portion, the valve main body engaging portion is engaged with the button rotation engaging portion, and in this state, the button is disposed in the circumferential direction of the button inner surface. Is rotated, the valve body engaging part can enter the return preventing engaging part beyond the return preventing projection,
When the button is rotated in the circumferential direction of the inner surface of the button when the valve main body engaging portion is engaged with the return preventing engaging portion, the valve main body engaging portion exceeds the return preventing protrusion. The endoscope valve according to any one of claims 1 to 4, wherein the valve cannot engage the button rotation engaging portion.   The first force required for the valve body engagement portion to exceed the return prevention protrusion from the button rotation engagement portion is that the valve body engagement portion exceeds the return prevention protrusion from the return prevention engagement portion. The endoscope valve according to claim 1, which is smaller than a second force necessary for the operation.   The endoscope valve according to any one of claims 1 to 6, wherein the button rotation engaging portion is a groove having a length longer than a length in which the piston advances and retreats with respect to a direction in which the piston advances and retreats. The button is provided on the inner surface of the button, and includes a button engagement groove extending from the button engagement portion along a circumferential direction of the button inner surface,
The depth of the button engaging groove becomes shallower as the button engaging portion is separated from the button engaging portion along the circumferential direction of the button inner surface,
When the button is rotated in the circumferential direction of the button inner surface, the cylinder engaging portion engages with the button engaging groove,
The valve main body engagement portion engages with the return prevention engagement portion when at least a part of the cylinder engagement portion deviates from the button engagement portion and the button engagement groove. Endoscope valve according to the above. The button has a pressing surface provided so as to close one end of the cylindrical shape of the button,
The endoscope valve according to any one of claims 1 to 7, wherein the piston is attached to the piston by fitting with a button hole opened in the pressing surface.   An endoscope comprising the endoscope valve according to any one of claims 1 to 9.

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