JP2009089765A - Attachment for check valve of endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attachment for a check valve of an endoscope with which a valve opening drive projection piece for rotationally driving the valve element of the check valve provided in the endoscope to a forced open state is formed short and thereby damage to the valve opening drive projection piece and operation defects, etc., are eliminated. <P>SOLUTION: The valve opening drive projection piece 39 is arranged such that it is not rotated around an axis but is movable in an axial direction relative to a check valve connecting mouth piece 37, an engaging length regulating member 41 for regulating the engaging length of the valve opening drive projection piece 39 to a drive engaging groove 15a formed on the valve element 15 to be a fixed length or shorter is provided, and the check valve connecting mouth piece 37 is provided with a spring 42 for energizing the valve opening drive projection piece 39 in the direction of pressing it to the valve element 15. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a check valve for an endoscope that is detachably attached from the outside to a check valve provided on an outer wall portion of the endoscope so as to prevent gas from flowing into the endoscope from the outside. For attachments.

  In general, an endoscope is configured so that all partition walls that are separated from the outside are watertight so that they can be immersed in a disinfectant solution and cleaned. In order to prevent bulging and puncturing of the flexible rubber tube's curved skin, etc. during decompression, etc. during autoclave sterilization treatment, the gas is prevented from flowing from the inside to the outside. A check valve is provided on the outer wall so as to open at the outflow.

  However, if the pressure inside the endoscope is negative after the autoclave sterilization process is complete, problems such as the bending portion covering material biting into the inner member may occur, so the check valve is forcibly opened after the autoclave sterilization process. A valve opening adapter (one of the check valve attachments for an endoscope) for setting the valve state is used (for example, Patent Document 1).

  FIG. 16 shows such a check valve 80. The check valve 80 is provided with a valve body 83 that is urged inward from the outside of the endoscope by a compression coil spring 81 to abut against the valve seat 82.

Then, the valve-opening drive projecting piece 91 protruding from the check valve attachment side is engaged with the drive engagement groove 84 formed in the outer end portion of the valve body 83 from the outside to rotate. When driven, the valve body 83 is extended outwardly by the action of the cam mechanism 85 provided in the check valve 80 so that the check valve 80 is forcedly opened as indicated by a two-dot chain line. It has become.
JP 2002-177193 A

  In the check valve attachment for an endoscope having the above-described configuration, the valve-opening drive protrusion 91 is engaged with the drive engagement groove 84 of the check valve 80 as shown in FIG. When the check valve connection base 90 provided with the valve-opening drive protrusion 91 is rotated around the axis, the valve element 83 is drawn outward as shown in FIG.

  Therefore, the length of the valve-opening drive protrusion 91 needs to be at least a length (A + B) obtained by adding the extension length (B) of the valve body 83 to the engagement length (A) with respect to the drive engagement groove 84. When the valve-opening drive protrusion 91 is inserted into the drive engagement groove 84 and the rotation operation is started (FIG. 17), excessive torque or the like acts on the valve-open drive protrusion 91 to open the valve. In some cases, the drive protrusion 91 is damaged or malfunctions.

  According to the present invention, a valve-opening drive projecting piece for rotationally driving a valve body of a check valve provided in an endoscope to a forced valve-open state can be formed short, and as a result, It is an object of the present invention to provide an endoscope check valve attachment that can eliminate the occurrence of breakage or malfunction of a driving protrusion.

  In order to achieve the above object, the check valve attachment of the endoscope of the present invention is a reverse provided on the outer wall portion of the endoscope so as to prevent gas from flowing into the endoscope from the outside. An attachment for a check valve of an endoscope having a check valve connection base that is detachably attached to the stop valve from the outside and that can force the check valve to open. The valve is provided with a valve body biased in the direction from the outside of the endoscope toward the valve seat toward the valve seat so as to engage with a driving engagement groove formed in the valve body. The valve body is extended outwardly by driving the valve-opening drive projecting piece provided in the check valve connection base so that the check valve is forcedly opened. The valve-opening drive projecting piece does not rotate around the axis with respect to the check valve connection base, but is movably arranged in the axial direction. An engagement length restricting member is provided for restricting the engagement length of the valve-opening drive protrusion with respect to the drive engagement groove to a predetermined value or less, and biases the valve-opening drive protrusion in a direction of pressing the valve-opening protrusion. A spring is provided in the check valve connection base.

  The engagement length restricting member is formed integrally with the valve opening drive projecting piece and cooperates with the valve opening drive projecting piece, and the engagement length restricting member abuts on the outer end surface of the valve body for driving. The engagement length of the valve-opening projecting piece with respect to the engagement groove may be regulated to a certain value or less. In that case, the engagement length regulating member is a plate-like member, and the valve-opening drive projecting piece is It may be formed protruding from the plate surface of the engagement length regulating member.

  Further, the spring may be a coil spring. In that case, the coil spring may be a tapered coil spring whose diameter gradually changes from one end side to the other end side.

  According to the present invention, the valve-opening drive projecting piece does not rotate around the axis with respect to the check valve connection base, but is movably disposed in the axial direction, and is formed on the check valve valve body. An engagement length regulating member is provided for regulating the engagement length of the valve-opening drive protrusion with respect to the engagement groove to a predetermined value or less, and a spring that biases the valve-opening drive protrusion in a direction of pressing the valve-opening drive protrusion. Since the check valve connection cap is provided, the length of the valve-opening drive projecting piece for rotationally driving the valve body of the check valve to the forced valve-open state is made shorter than the fixed engagement length. As a result, excessive torque or the like does not act on the valve-opening drive projecting piece, so that the valve-opening drive projecting piece can be prevented from being damaged or malfunctioning.

  The check valve is forcibly opened by being detachably attached to the check valve provided on the outer wall of the endoscope so as to prevent gas from flowing into the endoscope from the outside. An attachment for a check valve of an endoscope having a check valve connection base that can be made into a direction toward the valve seat from the outside of the endoscope toward the inside A biased valve body is provided, and the valve-opening drive projecting piece provided in the check valve connection base is rotationally driven so as to engage with a drive engagement groove formed in the valve body. Therefore, the valve-opening drive projecting piece rotates around the axis with respect to the check valve connection base in the structure in which the valve body is extended outward and the check valve is forcedly opened. However, it is arranged so as to be movable in the axial direction so as to restrict the engagement length of the valve-opening drive protrusion to the drive engagement groove to a certain value or less. With Kakarigocho regulating member is provided, a spring for urging in a direction to press the valve element the valve opening driving protrusion is provided on the check valve connection mouth ring.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 12 shows the overall configuration of the endoscope. A bending portion 4 that can be bent by rotating a bending operation knob 3 provided in the operation portion 1 is provided at a distal end portion of the insertion portion 2 connected to the operation portion 1. The curved portion 4 is covered with a flexible rubber tube.

  Connected to the distal end of the bending portion 4 is a distal end portion main body 5 in which an observation window or the like is arranged. A light guide connector 7 that is detachably connected to a light source device (also a video processor) (not shown) is attached to the distal end of the flexible connecting tube 6 that extends from the operation unit 1.

  In this endoscope, the partition walls that are partitioned from the outside are all made watertight by packing, O-rings, and the like, and the respective parts communicate with each other inside. A check valve 10 is provided on the outer wall of the light guide connector 7 so as to adjust the pressure inside the endoscope during sterilization with ethylene oxide gas or autoclave.

  An attachment for the check valve of the endoscope is detachably attached to such a check valve 10. In this case, at least two of the endoscope leakage tester and the valve opening adapter are considered as attachments for the check valve of the endoscope.

  In addition, as described in Patent Document 1, the “valve opening adapter” is used during the sterilization process in order to reliably return the pressure inside the endoscope to the atmospheric pressure after the sterilization process using ethylene oxide gas or autoclave. It is a known one that is attached to the check valve 10 and removed after sterilization.

  The “leakage tester” is used to detect whether there is a pinhole or the like that causes a water leakage accident on the outer wall portion of the endoscope, which will be described later in this specification. .

  The check valve 10 of this embodiment is forcibly closed when not operated, and when a valve opening adapter (not shown) is attached during sterilization, the pressure inside the endoscope is higher than the outside. It is open and gas is allowed to pass from the inside to the outside. When the pressure inside the endoscope is lower than the outside, it is always closed and the gas is not allowed to pass from the outside to the inside.

  FIG. 13 shows the check valve 10, and the outside of the substantially cylindrical valve seat forming member 14 provided in a state of protruding outward from the outer wall of the light guide connector 7 that partitions the exterior and interior of the endoscope. In the vicinity of the end, a valve seat 14a having a shape that tapers outward is formed. Reference numeral 13 denotes an O-ring for sealing.

  On the outer wall surface of the connection tube 11 that is fitted on the outer periphery of the valve seat forming member 14 and fixed by screws, a check valve connection cap 37 of an attachment for a check valve of an endoscope, which will be described later, is formed. An engagement pin 12 for engaging with the guide groove 38 is provided so as to project sideways.

  The valve body 15 is disposed in the valve seat forming member 14 so as to be movable in the axial direction and rotatable around the axis, and is provided in an O-ring 16 in a circular groove formed in a tapered surface portion facing the valve seat 14a. Is installed.

  Therefore, when the O-ring 16 is pressed against the valve seat 14a, the check valve 10 is closed and the space between the inside and the outside of the endoscope is completely closed. When the O-ring 16 moves away from the valve seat 14a, the inside and the outside of the endoscope communicate with each other through the gap.

  It should be noted that an outer end portion of the valve body 15 located outside the valve seat 14a is provided on the check valve attachment of the endoscope as shown in FIG. 14 illustrating the XIV-XIV cross section. A drive engagement groove 15a for engaging the valve-opening drive protrusion 39 to rotate the valve body 15 about the axis is formed also as a vent opening opened on the outer surface.

  Returning to FIG. 13, the valve body 15 moves from the outside of the endoscope toward the inside toward the valve seat 14 a (that is, the O-ring 16 is pressed against the valve seat 14 a to close the check valve 10. A drive pin 19 that is biased by the compression coil spring 17 and pushes up the valve body 15 against the biasing force of the compression coil spring 17 to forcibly open the check valve 10 from the outside. It protrudes from the side surface near the inner end of the body 15.

  A spring receiving cylinder 18 that receives one end of the compression coil spring 17 is connected and fixed to the inner end portion of the valve body 15 by a drive pin 19. The spring receiving cylinder 18 is loosely fitted in the valve seat forming member 14, but can be moved forward and backward in the axial direction integrally with the valve body 15, and a plurality of ventilation grooves are formed in the outer peripheral portion in the direction parallel to the axial line. 18a is formed.

  A cam groove 22 for driving the drive pin 19 is formed on the side wall of the cylindrical portion of the valve seat forming member 14. As shown in the developed view of FIG. 15, the cam groove 22 is formed with a chevron-shaped cam surface on the lower surface against which the drive pin 19 is pressed by the urging force of the compression coil spring 17.

  The cam groove 22 restricts the movement of the drive pin 19 ″ accompanying the opening / closing operation of the valve body 15 when the valve opening adapter or the like is attached to the check valve 10 and the valve body 15 is rotated by the maximum rotation angle θ. In order to prevent this, it is formed in a shape opened upward from the bottom of the chevron-shaped cam surface, 22a being the open portion.

  The intermediate portion of the cam surface of the chevron of the cam groove 22 pushes up the drive pin 19 ′ that has come to that position against the urging force of the compression coil spring 17 so as to force the valve body 15 to open. To function.

  At the attachment / detachment position where the valve opening adapter or the like is removed from the check valve 10, a pin abutting portion 22b that prevents the drive pin 19 from moving to the valve open state and forcibly maintains the valve closed state is a cam. It is formed on the upper surface of the groove 22.

  In the check valve 10 configured as described above, in a state where the valve opening adapter is attached, the O-ring 16 of the valve body 15 is pressed against the valve seat 14a by the urging force of the compression coil spring 17, and is closed. When the pressure outside the endoscope falls below the internal pressure by a certain level or more, the differential pressure causes the valve body 15 to be pushed outward, resulting in a valve opening state in which a gap is formed between the valve seat 14a and the O-ring 16. .

  Then, at a position where the valve body 15 is rotated from the state to the attachment / detachment position in the direction of removing the valve opening adapter, the drive pin 19 ′ at that position is pushed up by the angled cam surface of the cam groove 22. The O-ring 16 is separated from the valve seat 14a, the check valve 10 is forcibly opened, and the inside and outside of the endoscope communicate with each other.

FIG. 3 shows a state in which a leakage tester 30 which is one of the check valve attachments of the endoscope is connected to the check valve 10.
The leakage tester 30 of this embodiment is provided near the outlet of the pressurizing pump 31 and the pressurizing pump 31 that manually pressurizes the air and sends it from the check valve connecting base 37 side toward the check valve 10 side. A pressure release valve 32 that can manually open the flow path of the pressurized air, an air chamber 33 through which the pressurized air passes, and a pressure gauge 34 that measures and displays the atmospheric pressure in the air chamber 33. The balloon 36 is provided in the middle of the connection tube 35 extending from the outlet of the air chamber 33, and is attached to the tip of the connection tube 35 so as to be detachably connectable to the check valve 10 from the outside. And a check valve connection cap 37 or the like. Instead of the manual pressurization pump 31, an electric pump provided in a light source device or an air supply device may be used.

  FIG. 4 is an enlarged view of the check valve connection cap 37 portion of the leakage tester 30, and a substantially cylindrical cap-shaped check valve connection formed to completely cover the connection cylinder 11 of the check valve 10. The base 37 includes a guide groove 38 that engages with the engagement pin 12 protruding from the check valve 10, a valve-opening drive protrusion 39 that engages with the drive engagement groove 15 a of the valve body 15, In addition, an O-ring 40 and the like for sealing a gap between the outer peripheral surface of the connection cylinder 11 and the like are provided.

  FIG. 5 is a development view of the guide groove 38. A linear groove is formed in the direction parallel to the axis line at the attachment / detachment position of the engagement pin 12, and the maximum of the cam groove 22 on the check valve 10 side further in the circumferential direction from the deep position. A circumferential groove is formed by the same angle as the rotation angle θ. However, a step 38a is formed in the guide groove 38 at an angle of 3θ / 4 from the attachment / detachment position. When the engagement pin 12 is guided, the engagement pin 12 collides with the step 38a in the middle of the guide groove 38. In order to move the engagement pin 12 deeper than that, it is necessary to once move the check valve connection cap 37 in the axial direction at the position of the step 38a.

  In addition, the check valve connection cap 37 is formed with a display of “SCOPE”, which means an endoscope, in a range from a position slightly rotated from the attachment / detachment position to the front of the step 38a along the guide groove 38, At the maximum rotational position (θ), “VALVE” indicating a check valve is displayed.

  As shown in FIG. 6, a pair of valve-opening drive projecting pieces 39 are provided at positions that engage with the drive engagement groove 15a formed in the valve body 15 described above. A state of protruding from the plate surface of the substantially disc-shaped engagement length regulating member 41 for regulating the engagement depth (that is, the engagement length) of the valve-opening drive projection piece 39 with respect to the engagement groove 15a to a certain level or less. Further, it is formed integrally with the engagement length regulating member 41. Therefore, the valve-opening drive projecting piece 39 always moves together with the engagement length regulating member 41. 41a is a notch for restricting the engagement length restricting member 41 from rotating in the direction around the axis in the check valve connection cap 37, and 44 is a vent hole.

  As shown in FIG. 4, the engagement length regulating member 41 is fitted and disposed in the check valve connection base 37, but the inner surface shape of the check valve connection base 37 is a diagram illustrating a VII-VII cross section. 7, a part of the circular portion has a linear portion 37 a into which the cutout portion 41 a of the engagement length regulating member 41 is fitted. Therefore, the engagement length restricting member 41 and the valve-opening drive projecting piece 39 integrated therewith do not rotate around the axis within the check valve connection cap 37 but are movable in the axial direction.

  Then, as shown in FIG. 4, the valve-opening drive protrusion 39 and the engagement length regulating member 41 that are integrally formed are directed toward the opening end side of the check valve connection base 37 (from above in the drawing). A compression coil spring 42 that biases (downward) is disposed in the check valve connection cap 37. Therefore, in the state where the check valve connection cap 37 is connected to the check valve 10, the valve-opening drive protrusion 39 and the engagement length regulating member 41 are outside the outer end surface of the check valve 10 by the compression coil spring 42. It will be urged in the direction of being pressed from.

  However, the retaining nut 43 for restricting the valve-opening drive projecting piece 39 and the engagement length restricting member 41 from moving more than necessary contacts the vicinity of the outer edge of the engagement length restricting member 41. It is screwed into the inner peripheral portion of the check valve connection base 37. FIG. 8 shows a VIII-VIII cross section in FIG.

  Returning to FIG. 4, with this configuration, the valve-opening drive protrusion 39 and the engagement length restricting member 41 that are integrally formed and cooperate with each other are opened by the compression coil spring 42 at the open end of the check valve connection base 37. The engagement length regulating member 41 is stationary while being in contact with the retaining nut 43. When the valve-opening drive protrusion 39 and the engagement length regulating member 41 are pushed from the open end side of the check valve connection base 37 to the back side (that is, from the bottom to the top in the figure), the compression coil spring 42 is pressed. When compressed, it moves into the space on the inner side of the check valve connection cap 37 and when such a pushing force stops working, the engagement length regulating member 41 returns to the original state where it comes into contact with the retaining nut 43.

  FIG. 1 shows a state in which the check valve connecting cap 37 is directly covered with the check valve 10 in the axial direction, and the engagement pin 12 is engaged with the guide groove 38. As indicated by “N” in FIG. 5, the linear groove portion of the guide groove 38 is located at the deepest position that enters straight from the entrance. The valve body 15 is not separated from the valve seat 14a, and the check valve 10 is in a forced valve closing state similar to the state where the check valve connection cap 37 is not attached.

  In this state, the pair of valve-opening drive protrusions 39 are fitted into the drive engagement grooves 15a of the valve body 15 as shown in FIG. 2 illustrating the II-II cross section in FIG. As shown in FIG. 1, the engagement length regulating member 41 that is in contact with the valve body 15 (or the connecting cylinder 11) moves in the axial direction so as to compress the compression coil spring 42 to a medium level. is doing.

  The protruding length of the valve-opening drive protrusion 39 from the engagement length regulating member 41 is a length necessary and sufficient to engage with the drive engagement groove 15a of the valve body 15 (here, the drive engagement groove). 15a), and is not formed longer than that.

  Next, the check valve connection cap 37 is rotated around the axis with respect to the check valve 10, and along “SCOPE” until the engagement pin 12 reaches the stepped portion 38 a of the guide groove 38 shown in FIG. 5. When it comes to the position, in FIG. 15, the drive pin 19 comes to the position of the forced opening state in the intermediate region of the cam groove 22.

  In this case, as shown in FIG. 9, the valve body 15 is drawn away from the valve seat 14 a by the engagement of the drive pin 19 and the cam groove 22, and the check valve 10 is forcedly opened. is there. The engagement length regulating member 41 is pushed up to a state where the compression coil spring 42 is largely compressed by the movement of the valve body 15, and the valve-opening drive protrusion 39 integrated with the engagement length regulating member 41 drives the valve body 15. The engagement state similar to the initial engagement state is maintained with respect to the engagement groove 15a.

  Thus, when the engagement pin 12 is in the position along the “SCOPE” in the guide groove 38 (forced valve opening position), the check valve 10 is in the forced valve open state, Air is sent into the endoscope via the connection tube 35.

  When the engagement pin 12 reaches the position “VALVE” of the maximum rotation position (θ) beyond the step 38a of the guide groove 38 shown in FIG. 5, the drive pin 19 and the cam shown in FIG. Due to the positional relationship with the groove 22, as shown in FIG. 10, the valve body 15 is brought into contact with the valve seat 14 a by the urging force of the compression coil spring 17.

  In this state, the check valve 10 functions as an original check valve that prevents gas from flowing into the inside of the endoscope and opens when the gas flows from the inside to the outside. The projecting piece 39 and the engagement length regulating member 41 move in the axial direction in accordance with the operation of the valve body 15, and the valve-opening drive projecting piece 39 is always in the initial position with respect to the drive engaging groove 15 a of the valve body 15. An engagement state similar to the engagement state is maintained.

Next, the use of the leakage tester 30 of the above embodiment will be described.
When the check valve connection cap 37 of the leakage tester 30 is attached to the check valve 10 and the engaging pin 12 hits the step 38a of the guide groove 38 and cannot be rotated any more, as shown in FIG. The check valve 10 is forcedly opened.

  Therefore, in the state shown in FIG. 3, the pressure pump 31 is operated in a state where the pressure release valve 32 is not open to the atmosphere, and pressurized air is sent into the endoscope via the check valve 10. The pressure change measured by the pressure gauge 34 is observed after increasing the pressure in the mirror.

  Then, if there is no air leak in the exterior part of the entire endoscope, there is no change in the pressure value measured and displayed by the pressure gauge 34, and when the pressure value displayed by the pressure gauge 34 gradually decreases, the exterior part of the endoscope It can be seen that there is an air leak. Therefore, the pressure release valve 32 is once opened to return the internal pressure of the leakage tester 30 to atmospheric pressure, and then the pressure release valve 32 is closed again.

  Next, in FIG. 5, the mounting position of the check valve connection cap 37 with respect to the check valve 10 is shifted in the axial direction and then rotated in the circumferential direction so that the locking pin 12 can pass the step 38a portion. When the combined pin 12 reaches the deepest “VALVE” position of the guide groove 38, the check valve 10 is closed as shown in FIG.

  Therefore, when the pressurization pump 31 is operated and the pressurization air is sent out from the pressurization pump 31 again in the state shown in FIG. 1, the check valve 10 is in the closed state and the pressurization air is kept in the endoscope. Is not sent (or difficult to be sent), so that pressurized air accumulates in the space (closed space) in the leakage tester 30 formed on the outer surface of the check valve 10 and the balloon 36 is inflated, and the pressure gauge 34 is in a state of measuring and displaying the pressure in the space.

  Then, when a change in pressure measured by the pressure gauge 34 is observed, if there is no air leak in the check valve 10, there is no change in the pressure value measured and displayed by the pressure gauge 34, and the pressure gauge 34 displays. When the pressure value gradually decreases, it can be seen that there is an air leak in the check valve 10 and the pressurized air leaks into the endoscope. As described above, according to the present invention, it is possible to detect a water-tight failure in the closed state of the check valve 10 that could not be detected in the past, and more reliably prevent a water leakage accident of the endoscope. Note that the air leak detection operation of the check valve 10 may be performed prior to the air leak detection operation of the exterior part of the endoscope.

  Note that the present invention is not limited to the above-described embodiment. For example, as shown in FIG. 11, if a tapered coil spring whose diameter gradually changes from one end side to the other end side is used as the compression coil spring 42, Without increasing the size of the check valve connection cap 37, the spring constant of the compression coil spring 42 can be set to a more stable value to obtain a good operation.

  Further, the shape of the guide groove 38 and the shape of the cam groove 22 can take various embodiments, and the present invention is applied not only to a leakage tester but also to a valve opening adapter as an attachment for a check valve of an endoscope. can do.

It is side surface sectional drawing of the state in which the non-return valve connection nozzle | cap | die of the leakage tester for endoscopes which concerns on 1st Example of this invention was connected to the non-return valve. It is II-II sectional drawing in FIG. 1 of the 1st Example of this invention. 1 is an external view of a state in which an endoscope leakage tester according to a first embodiment of the present invention is connected to an endoscope. FIG. It is a side half sectional view of the check valve connection cap part of the 1st example of the present invention. It is an expanded view of the guide groove formed in the non-return valve connection cap of the 1st Example of this invention. It is a single perspective view of the valve-opening drive protrusion and the engagement length regulating member of the endoscope leakage tester according to the first embodiment of the present invention. It is VII-VII sectional drawing in FIG. 4 of the 1st Example of this invention. It is VIII-VIII sectional drawing in FIG. 4 of 1st Example of this invention. Check valve connection cap and check valve when detecting the presence or absence of air leakage in the exterior part of the entire endoscope (forced valve opening state) by the endoscope leakage tester according to the first embodiment of the present invention It is side surface sectional drawing which shows a connection state. The connection state of a non-return valve connection cap and a non-return valve when detecting the presence or absence of air leakage of the non-return valve by the leakage tester for endoscopes according to the first embodiment of the present invention (closed state) is shown. It is side surface sectional drawing. It is side surface sectional drawing of the forced valve opening state by which the non-return valve connection nozzle | cap | die of the leakage tester for endoscopes which concerns on 2nd Example of this invention was connected to the non-return valve. 1 is an external view of an endoscope in which a check valve attachment for an endoscope of the present invention is used. It is side surface sectional drawing of the non-return valve in which the attachment for non-return valves of the endoscope of 1st Example of this invention is used. FIG. 14 is a cross-sectional view taken along the line XIV-XIV in FIG. 13 of the check valve in which the endoscope check valve attachment according to the first embodiment of the present invention is used. It is an expanded view of the cam groove of the check valve in which the check valve attachment for the endoscope according to the first embodiment of the present invention is used. It is side surface sectional drawing of the state before the attachment for check valves of the conventional endoscope is connected to a check valve. It is side surface sectional drawing of the state at the time of connecting the check valve attachment of the conventional endoscope to a check valve. It is side surface sectional drawing of the state after the check valve attachment of the conventional endoscope was connected to the check valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Check valve 14a Valve seat 15 Valve body 15a Driving engagement groove 17 Compression coil spring 22 Cam groove 30 Leakage tester 37 Check valve connection cap 38 Guide groove 39 Opening drive protrusion 41 Engagement length restricting member 42 Compression Coil spring (spring)

Claims (5)

A check valve provided on the outer wall of the endoscope is detachably attached to the endoscope so as to prevent gas from flowing into the endoscope from the outside, and the check valve is forcibly opened. An attachment for a check valve of an endoscope having a check valve connection base that can be in a valve state,
The check valve is provided with a valve body biased in a direction from the outside of the endoscope toward the inside toward the valve seat, and is formed in a driving engagement groove formed in the valve body. When the valve-opening drive protrusion provided in the check valve connection base is rotated so as to be engaged, the valve body is extended outward, and the check valve is forcedly opened. In what is configured to be
The valve-opening drive projecting piece does not rotate around the axis with respect to the check valve connection base, but is movably arranged in the axial direction, and the valve-opening drive projecting piece is engaged with the drive engagement groove. An engagement length regulating member for regulating the total length to a certain value or less is provided, and a spring that biases the valve-opening drive projecting piece in a direction to press the valve body is provided on the check valve connection base. An attachment for a check valve of an endoscope.   The engagement length restricting member is formed integrally with the valve opening drive projecting piece and co-operates with the valve opening drive projecting piece, and the engagement length restricting member contacts the outer end surface of the valve body. The endoscope check valve attachment according to claim 1, wherein an engagement length of the valve-opening protrusion with respect to the drive engagement groove is restricted to a predetermined value or less.   The check valve for an endoscope according to claim 2, wherein the engagement length restricting member is a plate-like member, and the valve-opening drive projecting piece is formed to protrude from a plate surface of the engagement length restricting member. Attachment for.   The endoscope check valve attachment according to claim 1, 2 or 3, wherein the spring is a coil spring.   The endoscope check valve attachment according to claim 4, wherein the coil spring is a tapered coil spring whose diameter gradually changes from one end side to the other end side.

Images