JP5618953B2 - Forceps plug and endoscope - Google Patents

Description

  The present invention relates to a non-reusable forceps plug attached to a forceps opening of an endoscope, and an endoscope including the forceps plug.

  Conventionally, in the medical field, an insertion portion of an endoscope is inserted into the body of a subject, and various treatments are performed not only on the inside of the body but also on the site to be observed. Specifically, various treatment tools such as forceps and an incision tool are inserted into the forceps channel in the insertion portion from the forceps port provided in the operation portion of the endoscope, and are led out from the forceps outlet opened at the distal end of the insertion portion. As a result, various treatments such as excision and collection of the observation site are performed.

  A forceps plug through which a treatment tool can be inserted is attached to the forceps opening. This forceps plug prevents bodily fluids, dirt, air, etc. from leaking into the forceps channel due to changes in internal pressure of the body and the like, and from the forceps opening to the outside. As such forceps plug, since a body fluid or the like adheres due to use, a disposable type that cannot be reused is generally used so that it is replaced with a new one for each use from the viewpoint of infection prevention.

  In the forceps plugs of Patent Documents 1 to 3, a low-strength portion having a low strength is formed at a part of the engaging portion of the forceps plug that engages with the forceps opening by cutting or the like. This forceps plug can be removed from the forceps opening by breaking the low-strength portion.

  Patent Document 4 discloses an endoscope that can prevent reuse of a disposable tip cover. An engagement piece provided on the distal end cover is engaged with the distal end portion of the endoscope (hereinafter referred to as the endoscope distal end portion). Since the tip cover can be removed by destroying the locking piece with a jig, the used tip cover cannot be reused. Based on the description in Patent Document 4, when the forceps plug is removed, the engaging portion of the forceps plug is broken with a jig, so that the reuse of the forceps plug can be prevented.

JP 2008-043774 A JP 2006-346197 A JP-A-3-047275 JP-A-9-075295

  Since the forceps plugs of Patent Documents 1 to 3 are formed with a low-strength portion so as to be easily broken when removed from the forceps port, an error may occur when attaching the forceps plug to the forceps port or during endoscopy. The low strength part may be destroyed.

  Further, in order to break the engaging portion of the forceps plug with a jig based on the description in Patent Document 4, it is necessary to form a low-strength portion in advance in the engaging portion in order to facilitate the breaking. For this reason, there exists a possibility of destroying a low intensity | strength part accidentally similarly to patent documents 1-3.

  An object of the present invention is to provide a forceps plug that cannot be reused without forming a low-strength portion or the like in a part of the forceps plug, and an endoscope including the forceps plug.

  In order to achieve the above object, the present invention provides a cylindrical forceps port provided on the outer surface of an endoscope, wherein the forceps plug is attached to a forceps port that leads to a channel provided inside the endoscope. A cylindrical plug body having an insertion hole in which both ends are opened and the mouth portion of the forceps port is inserted from one end thereof, and the insertion hole is provided on the inner peripheral surface of the plug body forming the insertion hole, An engagement portion that engages with the outer peripheral surface of the forceps port inserted into the insertion hole, and is provided in the insertion hole and on the other end side of the insertion hole from the engagement portion, and is inserted from the other end of the insertion hole. The slit is closed when the treatment instrument is not inserted, and the slit closes when the treatment instrument is not inserted, and the edge of the slit closely contacts the treatment instrument when the treatment instrument is inserted. An elastic valve body that prevents fluid leakage, When the engagement portion receives an engagement release operation from an engagement release tool inserted from the other end of the insertion hole, the engagement portion releases the engagement with the outer peripheral surface, and the slit releases the engagement. When the disengagement operation is performed by a tool, the tool is destroyed by receiving a force from the disengagement tool.

  A plurality of the engaging portions are arranged along the circumferential direction on the inner peripheral surface of the stopper main body, and extend along a direction along the central axis of the insertion hole, and the outer periphery of the forceps port An arm portion having an arm end facing the surface and an arm other end positioned on the front side of the forceps port; and a flange formed on an outer peripheral surface of the forceps port provided on each arm one end. An engaging claw that engages with each other, and a protruding portion that is provided at the other end of each arm and protrudes toward the central axis. When the protrusion receives a pressing force from the disengagement tool toward the inner side of the forceps opening, the one end of the arm is separated from the outer peripheral surface of the forceps opening and the other end of the arm approaches the central axis. As the arm portion tilts, the engagement claw and the flange It is preferable to release the engagement.

  It is preferable that the slit is broken by receiving the pressing force from the engagement release tool before the engagement between the engagement claw and the flange is released.

  The valve body is preferably provided separately from the plug body.

  The engagement portion is an engagement protrusion that engages with a through hole that penetrates the inside and outside of the forceps opening and extends in a direction substantially perpendicular to the center axis of the insertion hole and the slit. Is a state in which, as the disengagement operation, when receiving a radial pressing force toward the outside of the forceps port from the disengagement tool inserted into the forceps port with the slit inserted, It is preferable to release the engagement with the through hole.

  On the inner peripheral surface of the stopper main body, a pair of engaging protrusions that are respectively engaged with a pair of opposed through holes formed in the forceps opening are provided, and the pair of engaging protrusions are When receiving a pressing force in the radial direction from the engagement release tool that opens and closes like a bowl, it is preferable to release the engagement with the pair of through holes.

  It is preferable that the slit is broken by receiving a radial pressing force from the engagement release tool before the engagement between the engagement protrusion and the through hole is released.

  It is preferable that a portion surrounding the outer peripheral surface of the forceps opening in the plug body is formed of a rigid material.

  In the valve body, a long hole extending in a direction substantially orthogonal to the slit is formed in a region opposite to the other end side with respect to each of both end portions of the slit. Is preferred.

  The endoscope of the present invention includes an insertion portion to be inserted into a subject, an operation portion connected to a proximal end portion of the insertion portion, and a channel provided in the operation portion. The forceps according to any one of claims 1 to 9, which is attached to the forceps opening provided on the outer surface of the operation portion, the forceps opening communicating with the channel, and the forceps opening provided on the outer surface of the operation portion. And a stopper.

  The forceps plug and endoscope according to the present invention receive a force from the disengagement tool when the disengagement operation is performed between the engagement portion and the outer peripheral surface of the forceps port by the disengagement tool. Since the slit is broken, the reuse can be prevented without forming a low-strength portion such as a notch in the forceps plug. As a result, it is possible to prevent the forceps plug from being unusable by accidentally destroying the low-strength portion when the forceps plug is attached or during endoscopy.

It is a perspective view of an endoscope. It is a perspective view of the forceps stopper of 1st Embodiment. It is sectional drawing of a forceps stopper. It is a disassembled perspective view of a forceps stopper. It is sectional drawing of an insertion hole and a set groove | channel. It is a perspective view of the engaging part of an engagement state. It is a perspective view of the engaging part of a disengagement state. It is a perspective view of a valve body. It is a perspective view of a disengagement tool. It is sectional drawing of the forceps stopper before mounting | wearing with a nozzle | cap | die. It is explanatory drawing for demonstrating insertion of the engagement cancellation | release tool to an insertion hole at the time of removal of a forceps stopper. It is sectional drawing of a forceps stopper when the front-end | tip of a disengagement tool reaches | attains a valve body. It is a perspective view of the valve body which the both ends of the slit were torn by the press of a disengagement tool. It is a perspective view of the valve body by which the slit was destroyed completely by the press of a disengagement tool. It is sectional drawing of a forceps stopper when each engaging part is switched to the engagement releasing state. It is a perspective view of each engaging part in FIG. FIG. 16 is a perspective view of the forceps stopper and the disengagement tool in FIG. 15. It is sectional drawing of the forceps stopper removed from the nozzle | cap | die. It is sectional drawing of the forceps stopper of 2nd Embodiment. It is sectional drawing of the forceps stopper before mounting | wearing with a nozzle | cap | die. It is explanatory drawing for demonstrating insertion of the hook-shaped engagement release tool to an insertion hole at the time of removal of a forceps stopper. It is sectional drawing of the forceps stopper with which the engagement protrusion is pressed from the inner side by the engagement cancellation | release tool. It is sectional drawing of a forceps stopper when engagement with an engagement protrusion and a through-hole is cancelled | released. It is sectional drawing of the forceps stopper removed from the nozzle | cap | die.

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

  A forceps channel 16 for inserting a treatment instrument 14 such as a forceps is disposed in the insertion portion 11. One end of the forceps channel 16 opens at the distal end surface of the insertion portion 11, and the other end is connected to a forceps port 17 provided in the operation portion 12. The forceps channel 16 is also used as a path for sucking blood, filth and the like from the opening of the distal end surface of the insertion portion 11. A suction channel (not shown) branched from the forceps channel 16 is disposed in the operation unit 12. This suction channel is connected to a suction button 19 provided on the operation unit 12.

  The suction button 19 is connected to a negative pressure source (not shown) outside the operation unit 12. The suction button 19 switches communication / blocking between the suction passage and the negative pressure source by pressing operation or releasing the pressing operation.

  As shown in FIG. 2, the forceps mouth 17 is provided with a forceps mouthpiece (hereinafter simply referred to as a mouthpiece) 20. A disposable forceps plug 21 into which the treatment tool 14 can be inserted is attached to the base 20. The forceps plug 21 prevents fluids such as bodily fluids, dirt, and air from leaking through the forceps channel 16 and leaking from the base 20 to the outside when the treatment tool 14 performs the treatment.

  As shown in FIGS. 3 to 5, the base 20 has an internal conduit 23 that leads to the forceps channel 16. The base 20 has a base body 20 a that is fixed inside the opening of the forceps opening 17, and a base end 20 b that protrudes to the front side of the opening of the forceps opening 17. On the outer peripheral surface of the base body portion 20a, a packing 24 that secures airtightness from the inner peripheral surface of the forceps port 17 is fitted. Hereinafter, the direction on the back side of the base 20 is simply referred to as “back direction”, and the direction on the near side of the base 20 opposite to the back direction is simply referred to as “front direction”. Further, the end and end face on the back side of each part of the base 20 and the forceps plug 21 are referred to as a rear end part and a rear end face, respectively, and the end part and end face on the near side of each part are referred to as a front end part and a front end face, respectively.

  The base end portion 20b is formed so that its outer diameter is slightly smaller than the outer diameter of the base body portion 20a. A flange 25 that engages with the forceps plug 21 is formed on the outer peripheral surface of the tip of the base tip 20b.

  The forceps plug 21 includes a cylindrical plug body 29, four engagement portions 30, and a valve body 31. The plug body 29 is made of an elastic material such as resin. An insertion hole 33 is formed in the plug body 29 by the inner peripheral surface thereof. The insertion hole 33 is open at both ends. The base end 20b is inserted into the insertion hole 33 from the opening on the back side, and the treatment instrument 14 is inserted from the opening on the near side.

  Further, four set grooves 34 in which the respective engaging portions 30 are respectively set are formed on the inner peripheral surface of the plug main body 29 along the circumferential direction thereof. Each set groove 34 extends from the rear end surface of the plug body 29 to a substantially central portion. Each set groove 34 has a trapezoidal cross section so that the width of the opening is narrower than the width of the bottom surface. Further, a deep groove portion 34 a that is one step deeper than the others is formed at the front end portion of each set groove 34.

  The engaging part 30 has an arm part 36, an engaging claw 37, and a protruding part 38. The arm portion 36 is disposed in each set groove 34 and has a shape extending long in the direction along the central axis CA of the insertion hole 33. The arm portion 36 is sandwiched between the side wall surfaces of the set groove 34 having a trapezoidal cross section with a force that does not drop from the set groove 34.

  The engaging claw 37 is formed at the rear end portion (one arm end portion) of each arm portion 36 and protrudes toward the central axis CA. Each engaging claw 37 engages with the flange 25 of the base end portion 20 b inserted into the insertion hole 33.

  The protruding portion 38 is formed at the front end portion (the other arm end portion) of each arm portion 36, and protrudes from the front end portion toward the central axis CA up to the opening of the base end portion 20b. The front end surface of the protrusion 38 is in contact with the wall surface on the near side of the set groove 34. Further, a fulcrum 39 that abuts on the peripheral edge of the opening of the base tip 20b is formed on the protrusion 38.

  A retaining portion 40 that protrudes into the deep groove portion 34 a is formed on the outer peripheral surface of the arm portion 36 that faces the inner peripheral surface of the stopper main body 29. The retaining portion 40 is in contact with the wall surface of the deep groove portion 34a on the back side. Thereby, it is prevented that each engaging part 30 moves to the back direction side relatively with respect to the plug main body 29. As a result, when each engaging portion 30 is engaged with the flange 25, the forceps plug 21 cannot be removed from the base 20 even if a pulling operation is performed on the forceps plug 21 toward the front side.

  Further, the protrusion 40 has a protruding length that is longer than the depth of the deep groove 34a. Thereby, a gap 41 is formed between the inner peripheral surface of the stopper main body 29 and the outer peripheral surface of the arm portion 36. Thereby, the space for moving the engaging claw 37 engaged with the flange 25 in the radial direction of the insertion hole 33 is secured. As a result, the engagement claw 37 can be moved in the radial direction of the insertion hole 33 in the set groove 34 to release the engagement with the flange 25 (see FIG. 15).

  The engagement portion 30 includes an engagement state in which the engagement claw 37 as shown in FIG. 6 engages with the flange 25, and an engagement state in which the engagement claw 37 as shown in FIG. 7 releases the engagement with the flange 25. The release state can be taken. Each engaging portion 30 switches from the engaged state to the disengaged state when the individual projecting portion 38 receives a pressing force toward the back side (hereinafter referred to as a back side pressing force).

  Specifically, when each protrusion 38 receives a depth direction pressing force, each arm 36 tilts so that each engagement claw 37 is separated from the center axis CA and each protrusion 38 is close to the center axis CA. As a result, each engagement claw 37 moves in the radial direction of the insertion hole 33 relative to the flange 25, so that the engagement between each engagement claw 37 and the flange 25 is released. As a result, each engagement portion 30 can be switched from the engaged state to the disengaged state.

  Returning to FIG. 3 and FIG. 4, the valve body 31 is formed in a substantially disc shape with various elastic materials such as rubber. The valve body 31 is provided in the insertion hole 33 and at a position closer to the front side than the engaging portions 30. A slit 43 through which the treatment instrument 14 can be inserted is formed at the center of the valve body 31.

  When the treatment instrument 14 is not inserted, the slit 43 is closed by the elastic force of the valve body 31 to maintain a watertight / airtight state. In addition, the slit 43 is in a state in which the slit edge is in close contact with the outer peripheral surface of the treatment instrument 14 by the elastic force of the valve body 31 when the treatment instrument 14 is inserted. Thus, leakage of body fluid or the like from the base 20 can be prevented both when the treatment instrument 14 is not inserted and when it is inserted.

  As shown in FIG. 8, the valve body 31 is formed with a pair of long holes 45 in a region opposite to the other end side with respect to each of both end portions of the slit 43. Both long holes 45 extend in a direction substantially orthogonal to the slit 43 along the periphery of the valve body. Note that the term “substantially orthogonal” includes both the case of being completely orthogonal and the case of being substantially orthogonal (when the angle formed by the slit 43 and the long hole 45 is a value close to 90 °). The valve body 31 is formed with a slit 43 and a long hole 45 so as to form a substantially H shape. Both the long holes 45 are formed in order to surely cause the slit 43 to be destroyed when the valve body 31 receives a pressing force on the back side (see FIGS. 13 and 14). Since the pair of long holes 45 are mounted so as to be covered in both the front and back directions by the plug body 29, body fluids and the like do not leak from this portion.

  As shown in FIG. 9, the disengagement tool 47 is used to remove the forceps plug 21 from the base 20. The disengagement tool 47 switches each engagement part 30 from the engaged state to the disengaged state. The disengagement tool 47 has a cylindrical jig body 47a and a rod-shaped insertion portion 47b provided on the rear end surface of the jig body 47a.

  The insertion portion 47 b is inserted into the insertion hole 33 from the opening on the near side of the insertion hole 33. The length of the insertion portion 47 b is formed longer than the length from the opening on the near side of the insertion hole 33 to each protrusion 38. In addition, the diameter of the insertion portion 47 b is formed to be approximately the same as the diameter of the insertion hole 33. Thus, the distal end of the insertion portion 47 b inserted into the insertion hole 33 applies a pressing force on the back side to the protruding portion 38 after passing through the slit 43.

  Next, the operation of the forceps plug 21 having the above-described configuration, particularly the method for mounting and removing the forceps plug 21 to the base 20 will be described. First, the position of the forceps plug 21 is adjusted so that the center of the insertion hole 33 coincides with the center of the base end portion 20b. Next, a pressing operation for pressing the forceps plug 21 toward the cap tip 20b is started. Thereby, the base end portion 20 b and the flange 25 are inserted into the insertion hole 33.

  As shown in FIG. 10, the flange 25 inserted into the insertion hole 33 abuts on the engagement claw 37 of each engagement portion 30. If the pressing operation of the forceps plug 21 is continued, each arm portion 36 is curved in an arc shape by the pressing from the inside by the flange 25 until each engaging claw 37 gets over the flange 25, and The claw 37 is expanded in the radial direction of the insertion hole 33.

  When each engagement claw 37 gets over the flange 25, the original shape of each arm portion 36 is restored and each engagement claw 37 engages with the flange 25. Thus, the attachment of the forceps stopper 21 is completed. After preparation for endoscopy is completed, the insertion portion 11 is inserted into the body of the subject. And while observing, the front-end | tip of the insertion part 11 arrives at the desired position in a body. At this time, when treatment is necessary, the treatment tool 14 is inserted into the forceps channel 16 from the forceps plug 21 to perform various treatments. Then, after the endoscopic examination is completed, the removal of the forceps plug 21 is executed.

  As shown in FIG. 11, as the disengagement operation, the insertion portion 47 b of the disengagement tool 47 is first inserted into the insertion hole 33 from the opening on the near side. As shown in FIG. 12, the insertion portion 47 b inserted into the insertion hole 33 contacts the slit 43 of the valve body 31. When the insertion of the insertion portion 47 b is continued, the insertion portion 47 b applies a back side pressing force to the slit 43.

  At this time, a long hole 45 is formed in the valve body 31. For this reason, when a predetermined or more depth direction pressing force is applied to the slit 43, both ends of the slit 43 are torn and both ends reach the long hole 45 as shown in FIG. 13. As a result, since the slit 43 is destroyed, it becomes difficult to prevent leakage of body fluid or the like when the treatment instrument 14 is not inserted / inserted.

  When the depth direction pressing force is continuously applied to the slit 43, as shown in FIG. 14, the portion surrounded by the slit 43 and the long hole 45 in the valve body 31 is bent toward the depth direction. As a result, when the insertion portion 47b penetrates the slit 43, the slit 43 is completely destroyed.

  The insertion portion 47 b that penetrates the slit 43 contacts the protruding portion 38 of each engaging portion 30. When the insertion of the insertion portion 47b is further continued, a depth direction pressing force is applied to the protruding portion 38 by the insertion portion 47b. Thereby, each arm part 36 inclines centering on the fulcrum 39 so that each engagement claw 37 may leave | separate from the central axis CA, and each protrusion part 38 may approach the central axis CA. As a result, each engaging claw 37 is expanded in the radial direction of the insertion hole 33.

  As shown in FIGS. 15 and 16, when the insertion portion 47 b is completely inserted into the insertion hole 33, the engagement between the engagement claws 37 and the flange 25 is released. Thereby, each engaging part 30 switches from an engagement state to an engagement release state. At the same time, as shown in FIG. 17, the rear end surface of the jig main body 47a abuts on the front end surface of the forceps plug 21, and further insertion operation is restricted. Therefore, if the insertion operation is performed until the jig main body 47a comes into contact with the forceps plug 21, each engaging portion 30 is reliably switched to the disengaged state. This completes the disengagement operation.

  As shown in FIG. 18, when the forceps plug 21 is pulled toward the front, the forceps plug 21 is removed from the base 20 together with the disengagement tool 47. Since the slit 43 of the forceps plug 21 is broken by the disengagement tool 47, leakage of body fluid or the like cannot be prevented when the treatment tool 14 is not inserted / inserted. As a result, reuse can be prevented without forming a low-strength portion such as a notch in the forceps plug 21. As a result, it is possible to prevent the forceps plug 21 from being unusable by accidentally destroying the low-strength portion when the forceps plug 21 is attached or during endoscopy.

[Second Embodiment]
Next, the forceps plug 50 according to the second embodiment of the present invention will be described with reference to FIGS. 19 and 20. The forceps plug 50 is attached to a base 51 provided in the forceps port 17. In addition, the same code | symbol is attached | subjected about the same thing as the said 1st Embodiment and a structure, and the description is abbreviate | omitted.

  The base 51 has basically the same configuration as the base 20 of the first embodiment. However, a pair of through holes 52 extending in the axial direction VA substantially perpendicular to the central axis CA and the slit 43 and facing each other are formed in the base end portion 51 a of the base 51. Both through-holes 52 penetrate the inside and outside of the die tip 51a. Note that the term “substantially vertical” refers to both the case of being completely vertical and the case of being substantially vertical (when the angle formed by each of the central axis CA and the slit 43 and the axial direction VA is close to 90 °). Is included.

  The forceps plug 50 is formed in a substantially cylindrical shape. An insertion hole 54 is formed in the forceps plug 50 by its inner peripheral surface. Both ends of the insertion hole 54 are open. The base end portion 51 a is inserted into the insertion hole 54 from the opening on the back side. In addition, the treatment instrument 14 or the cap 55 is inserted into the insertion hole 54 from the opening on the front side.

  The inside of the insertion hole 54 is partitioned by a partition wall 56 having a slit 43. Thereby, the insertion hole 54 is divided into a cap insertion hole 54a located on the back direction side and a cap insertion hole 54b located on the near side. The base end 51a is inserted into the base insertion hole 54a. The cap 55 is inserted into the cap insertion hole 54b when the treatment instrument 14 is not used. The cap 55 is provided integrally with the forceps plug 50 via the connection belt 57.

  The forceps plug 50 has a plug rear end 50a having a cap insertion hole 54a formed of a rigid material such as metal or hard resin, and a plug front end 50b forming a cap insertion hole 54b formed of a resin material or the like. . A pair of engaging protrusions 60 that are engaged with the through holes 52 are provided on the inner peripheral surface of the stopper rear end 50a.

  Both engaging protrusions 60 are formed of various elastic materials such as rubber that is softer than the plug rear end 50a. Both engagement protrusions 60 protrude from the inner peripheral surface of the plug rear end 50a toward the central axis CA. Both engaging protrusions 60 are covered with a rigid plug rear end 50a. For this reason, once both the engagement protrusions 60 are engaged with both the through holes 52, the engagement between the engagement protrusions 60 and the through holes 52 cannot be released from the outside, and the forceps plug 50 is removed from the base 51. It is not possible.

  As shown in FIG. 21, the disengagement tool 62 is used to remove the forceps plug 21 from the base 20. The disengaging tool 62 opens and closes like a bowl. The disengagement tool 62 includes a first arm 62a and a second arm 62b that are connected to each other so as to be rotatable relative to each other. Protrusions 63a and 63b projecting in the radial direction of the insertion hole 54 are provided at the tips of both arms 62a and 62b.

  A marker 64 is formed on both arms 62a and 62b. The length from the marker 64 to the protrusions 63a and 63b is adjusted to be substantially equal to the length from the opening of the cap insertion hole 54b to both the engagement protrusions 60.

  Next, the operation of the forceps plug 50 having the above-described configuration, particularly the process of removing the forceps plug 50 from the base 51 will be described. Note that the attachment of the forceps stopper 50 to the base 51 only requires a pressing operation of pressing the forceps stopper 50 toward the base end 51a. Thereby, both engaging protrusions 60 get over the flange 25 while being elastically deformed, and engage with both the through holes 52 respectively.

  After completion of the endoscopic examination, the cap 55 is removed from the cap insertion hole 54b. Next, as a disengagement operation, the two projecting portions 63a and 63b are inserted into the cap insertion hole 54b while the arms 62a and 62b of the disengagement tool 62 are initially closed. Then, after the position of the disengagement tool 62 is adjusted so that both protrusions 63 a and 63 b are substantially parallel to the slit 43, the disengagement tool 62 is inserted into the base 51. By this insertion operation, both protrusions 63a and 63b are inserted through the slit 43 and inserted into the base end portion 51a.

  The insertion operation of the disengaging tool 62 is continued until the marker 64 reaches the opening of the cap insertion hole 54b. Thereby, the position in the axial direction of central axis CA of both protrusion part 63a, 63b and both engagement protrusion 60 becomes substantially equal. Next, by rotating the disengagement tool 62 by 90 ° around the central axis CA, both the protrusions 63a and 63b are opposed to the both engagement protrusions 60, respectively.

  As shown in FIG. 22, when the arms 62a and 62b are opened, the arms 62a and 62b are opened in the base end 51a, so that the protrusions 63a and 63b are pressed against the engaging protrusions 60, respectively. It is done. As a result, the both engaging projections 60 are pressed in the radial direction from the inner side to the outer side in the base end portion 51a (hereinafter simply referred to as the base radial direction) and elastically deformed so as to contract in the base radial direction. At this time, the slit 43 is also expanded by receiving the pressing force from both arms 62a and 62b.

  As shown in FIG. 23, when the opening operation of both arms 62a and 62b is continued, both engaging projections 60 are pushed out from both through holes 52, respectively. As a result, the engagement between both the engagement protrusions 60 and both the through holes 52 is released. Also, before the engagement between the two is released, the slits 43 are expanded beyond the limit by the arms 62a and 62b, so that both ends of the slit 43 are torn. As a result, since the slit 43 is destroyed, it is difficult to prevent leakage of body fluid or the like when the treatment instrument 14 is not inserted / inserted, as in the first embodiment. This completes the disengagement operation.

  As shown in FIG. 24, after the engagement between both the engagement protrusions 60 and both the through holes 52 is released, a pulling operation is performed toward the front side with respect to the forceps plug 50. As a result, the forceps stopper 50 is removed from the base 51. Since the slit 43 of the forceps plug 50 is broken by the disengaging tool 62, the forceps plug 50 cannot be reused. As a result, the same effects as those described in the first embodiment can be obtained.

  In the said 1st Embodiment, although the valve body 31 is provided in the different body from the plug main body 29, both may be formed integrally.

  In the valve body 31 of the first embodiment, a pair of long holes 45 are formed in order to surely cause the slit 43 to be broken. For example, the partition wall 56 of the second embodiment has the same purpose. A pair of long holes 45 may be formed.

  In each of the above-described embodiments, the forceps plugs 21 and 50 attached to the caps 20 and 51 of the forceps opening 17 have been described as examples. However, the forceps stopper attached directly to the opening of the forceps opening 17 is described. However, the present invention can be applied.

  In the above embodiment, the endoscope 10 to be inserted into the trachea has been described as an example. The present invention can also be applied to endoscopes used for applications.

DESCRIPTION OF SYMBOLS 10 Endoscope 11 Insertion part 17 Forceps mouth 20,51 Forceps mouthpiece 21,50 Forceps stopper 30 Engagement part 31 Valve body 33,54 Insertion hole 43 Slit 47,62 Disengagement tool

Claims (10)

In the forceps plug that is a cylindrical forceps port provided on the outer surface of the endoscope and is attached to a forceps port that leads to a channel provided in the endoscope,
A cylindrical plug body having an insertion hole in which both ends are opened and the mouth portion of the forceps port is inserted from one end;
An engaging portion that is provided on an inner peripheral surface of the plug body that forms the insertion hole, and that engages with an outer peripheral surface of the forceps port inserted into the insertion hole;
The slit is provided in the insertion hole and on the other end side of the insertion hole with respect to the engaging portion, and has a slit through which the treatment instrument inserted from the other end of the insertion hole is inserted, and when the treatment instrument is not inserted The slit closes, and at the time of insertion of the treatment tool, an elastic valve body that prevents leakage of fluid from the forceps port by closely contacting the edge of the slit with the treatment tool,
When the engagement portion receives an engagement release operation from an engagement release tool inserted from the other end of the insertion hole, the engagement portion releases the engagement with the outer peripheral surface,
The forceps plug, wherein the slit is broken by receiving a force from the disengagement tool when the disengagement operation is performed by the disengagement tool. The engaging portion is
A plurality of arm portions arranged along the circumferential direction on the inner peripheral surface of the stopper main body and extending along a direction along the central axis of the insertion hole, and one end of the arm facing the outer peripheral surface of the forceps opening And an arm part having an arm other end located on the front side of the forceps opening,
An engaging claw that is provided at one end of each arm and engages with a flange formed on an outer peripheral surface of the forceps opening;
Provided at the other end of each arm, and a protruding portion protruding toward the central axis,
The engaging portion is configured such that, as the disengaging operation, when the protruding portion receives a pressing force toward the inner side of the forceps port from the disengaging tool, the one end of the arm is an outer peripheral surface of the forceps port. 2. The forceps plug according to claim 1, wherein the engagement between the engagement claw and the flange is released when the arm portion is inclined so that the other end portion of the arm is closer to the central axis. .   The forceps plug according to claim 2, wherein the slit is broken by receiving the pressing force from the disengagement tool before the engagement between the engagement claw and the flange is released.   The forceps stopper according to any one of claims 1 to 3, wherein the valve body is provided separately from the stopper body. The engaging portion is an engaging protrusion that penetrates through the inside and outside of the forceps opening and engages with a through hole extending in a direction substantially perpendicular to the central axis of the insertion hole and the slit,
The engaging protrusion receives a radial pressing force toward the outside of the forceps opening from the engagement releasing tool inserted into the forceps opening with the slit inserted as the engagement releasing operation. 2. The forceps plug according to claim 1, wherein the engagement with the through hole is sometimes released. On the inner peripheral surface of the stopper main body, a pair of engaging protrusions that are respectively engaged with a pair of the through holes facing each other formed in the forceps opening are provided,
The pair of engaging protrusions release the engagement with the pair of through holes, respectively, when the radial pressing force is received from the engagement release tool that opens and closes in a bowl shape. Item 6. The forceps plug according to Item 5.   6. The slit according to claim 5, wherein the slit is broken by receiving the radial pressing force from the engagement release tool before the engagement between the engagement protrusion and the through hole is released. 6. The forceps stopper according to 6.   The forceps plug according to any one of claims 5 to 7, wherein a portion surrounding the outer peripheral surface of the forceps opening in the plug body is formed of a rigid material.   In the valve body, a long hole extending in a direction substantially orthogonal to the slit is formed in a region opposite to the other end side with respect to each of both end portions of the slit. The forceps stopper according to any one of claims 1 to 8. An insertion part to be inserted into the subject;
An operation unit connected to a base end of the insertion unit;
A channel provided in the operation unit, the channel communicating with an opening provided at a distal end of the insertion unit;
A forceps opening provided on the outer surface of the operation section and leading to the channel;
The forceps stopper according to any one of claims 1 to 9, which is attached to the forceps opening,
An endoscope comprising: