JP5259783B2 - Endoscope plug - Google Patents

Description

  The present invention relates to an endoscope plug.

  Conventionally, medical endoscopes can not only observe the state of the body but also collect tissue cells or perform predetermined treatment when a lesion or the like is present in the body. It has a configuration. For this reason, the endoscope is provided with a treatment instrument insertion channel for inserting forceps and other treatment instruments through the insertion portion. The proximal end portion of the treatment instrument insertion channel communicates with a treatment instrument introduction section provided in the operation section, and the distal end opens as a treatment instrument outlet with the observation section provided on the distal end surface and the distal side surface of the insertion section. Yes.

  A forceps plug (plug body) is attached to the treatment instrument introduction portion via a base. The forceps plug closes the treatment instrument introduction section so that blood flowing back from the body of the subject, internal dirt, and physiological saline for washing the body does not leak out from the treatment instrument introduction section.

  The forceps plug is provided as a disposable type that is sterilized and disposable after use in order to prevent infection of a subject or an operator. However, there is a concern that it will be reused because it is not a type that cannot be reused. For this reason, in Patent Document 1, a finger-hook portion and a thin-wall portion that is broken by the force when the plug body is removed by holding the finger-hook portion are provided on the plug body that is exposed to the outside when attached to the base. The plug is broken so that this is impossible.

  Further, in Patent Document 2, the fixing plate that is fitted to the operation unit main body and fixes the sheath is made of a water-soluble polymer, and the fixing plate dissolves or expands when touched with a cleaning liquid after being removed and reused. Disposable medical devices that are disabled are disclosed.

JP-A-3-47275 Japanese Patent Laid-Open No. 7-95982

  However, in Patent Document 1, a finger-hanging portion that is accompanied by a destruction operation when removed from the base is provided, and the forceps plug is removed from the base using the finger-holding portion, so that a part of the forceps plug is broken and reused. Although not possible, it is also possible to remove the forceps plug without using a finger hook. In this case, there is a problem that it can be removed from the base without breaking and can be reused.

  Further, in the disposable medical device of Patent Document 2, at least a part of a part that does not directly contact the mucous membrane in the body cavity is made of a material containing a hydrophilic polymer, and a part is dissolved by washing after use. Or it is inflated to disable reuse. However, in the forceps plug that closes the entrance of the treatment instrument channel of the endoscope, the technique of Patent Document 2 is applied to the forceps plug by being directly exposed to blood, body fluid, filth, washing water, or the like that flows backward from the body of the subject. There is a problem that it cannot be used as it is for a plug body.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an endoscope plug body that cannot be reused.

  In order to achieve the above object, the present invention provides an endoscope plug body attached to an attachment portion of an endoscope, which is formed on a tubular plug body and the plug body, and is fitted to the attachment portion. And an attachment receiving portion for preventing movement of the plug body from the attachment portion in the insertion / removal direction, and the attachment receptacle at a position isolated from the liquid in a state where the attachment reception portion is fitted to the attachment portion. And a liquid contact portion that is in contact with the liquid so that the attachment receiving portion cannot be fitted into the attachment portion.

  The attachment portion is a substantially cylindrical base that communicates with a treatment instrument insertion channel in the endoscope, and the plug has a treatment instrument insertion hole through which a treatment instrument is inserted, and is fitted to the base. The base receiving portion is the attachment receiving portion, and the liquid contact portion is placed on the base receiving portion at a position isolated from the liquid from the treatment instrument insertion channel when the base receiving portion is fitted to the base. Is preferably formed. That is, an endoscope plug body that is fitted to a substantially cylindrical base that leads to a treatment instrument insertion channel in an endoscope and has a treatment instrument insertion hole through which the treatment instrument is inserted, and has a cylindrical plug body And a cap receiving portion that is formed on the cap main body, is fitted to the cap, and prevents movement of the plug main body in the insertion / removal direction from the cap, and the cap receiving portion is fitted to the cap And a liquid contact portion that is formed in the base receiving portion at a position isolated from the liquid from the treatment instrument insertion channel and that makes contact with the liquid so that the base receiving portion cannot be fitted into the base. It is preferable.

  The base has a base fitting portion at an outer end, and the base fitting portion has a base-side annular projecting portion projecting outward from the outer peripheral surface, and a base-side circumferential groove formed on the outer peripheral surface. The base receiving portion is formed on the inner peripheral surface of the plug body, and is formed on the inner peripheral surface of the stopper main body, and on the inner peripheral surface of the stopper body. It is preferable to have a plug body-side annular protrusion that fits into the base-side circumferential groove, and the liquid contact portion is formed on the inner peripheral surface of the stopper body-side annular protrusion.

  The base has a base fitting portion at an outer end, and the base fitting portion has a base-side annular projecting portion projecting outward from the outer peripheral surface, and a base-side circumferential groove formed on the outer peripheral surface. The cap receiving portion is formed on the inner peripheral surface of the plug body, and is fitted with the cap-side annular protrusion, and the plug body-side first circumferential groove; A stopper body side second circumferential groove having a larger inner diameter, and a locking ring in which an outer peripheral portion is fitted into the stopper body side second circumferential groove and an inner circumferential portion is fitted into the cap side circumferential groove. The liquid contact portion is preferably formed on the locking ring.

  The liquid contact portion is preferably composed of a water expansion member that absorbs water and expands, or a water-soluble material that dissolves in water. Moreover, it is preferable that the said plug main body is comprised by the water expansion | swelling member which absorbs water and expand | swells, and has a waterproof coating layer in the outer surface of the plug main body except the said liquid contact part. The plug body preferably includes a valve member that closes the treatment instrument insertion hole from the outside, a connecting member that connects the valve member to the plug body, and a valve member receiving portion into which the valve member is fitted.

  According to the present invention, in a state where the attachment receiving portion is fitted to the attachment portion, the attachment receiving portion is formed at a position isolated from the liquid, and the attachment receiving portion is fitted to the attachment portion in contact with the liquid. By having a liquid contact portion that cannot be used, when the endoscope is used, for example, when removing a plug body such as a forceps plug and cleaning, the fitting receiving portion is disengaged from the attachment portion, and the liquid contact portion Comes into contact with the cleaning liquid. When the liquid contact portion comes into contact with the cleaning liquid, the fitting with the mounting portion becomes impossible, so that the reuse of the plug body is prevented.

It is a perspective view including the partial front view which shows schematic structure of an endoscope system. It is sectional drawing which shows the state which attached the forceps stopper of 1st Embodiment to the nozzle | cap | die of a treatment tool introduction part. It is a perspective view which decomposes | disassembles and shows a forceps stopper and a nozzle | cap | die. It is a perspective view of the state which attached the forceps stopper to the treatment tool introduction part. It is sectional drawing which expands and shows a forceps stopper. It is a perspective view which shows an example of a deformation | transformation of the forceps stopper by washing | cleaning after using a forceps stopper. It is sectional drawing which expand | deploys and shows the forceps stopper of 2nd Embodiment. It is a disassembled perspective view which shows a forceps stopper main body, a locking ring, a nozzle | cap | die, and a treatment tool introduction part. It is sectional drawing which shows the forceps stopper in use. It is sectional drawing which shows the state from which the forceps stopper after use will fall from a nozzle | cap | die. It is sectional drawing of another embodiment which provided the water penetration hole in the liquid contact part. It is a top view of the latching ring of another embodiment which provided the uneven | corrugated surface in the liquid contact part.

  In FIG. 1, the endoscope 10 includes an operation unit 12, an insertion unit 13, and a universal cord 14. The universal cord 14 is connected to the light source device 18 and the processor device 19 via connectors 15 and 16 and a cable 17.

  The operation unit 12 is provided with an angle knob 21, an air / water supply button 22, a suction button 23, and the like. A treatment instrument introduction unit 24 is provided on the insertion unit 13 side of the operation unit 12. Various treatment tools 11 are inserted from the treatment tool introduction unit 24.

  The insertion unit 13 is connected to the operation unit 12 and is inserted into the body of the subject. The insertion portion 13 includes a flexible soft portion 25, a bendable bending portion 26, and a distal end hard portion 27 in order from the operation portion 12 side. The flexible part 25 has a length for allowing the distal rigid part 27 to reach a target position in the body. The bending portion 26 bends in the vertical and horizontal directions in conjunction with the operation of the angle knob 21 of the operation unit 12, and can direct the distal rigid portion 27 in a desired direction in the body.

  As is well known, the distal end surface of the distal rigid portion 27 is provided with a treatment instrument outlet 30 in addition to an observation window, an illumination window, and an air / water supply nozzle (both not shown). In the back of the observation window, an imaging unit such as an objective optical system, a CCD, or a CMOS image sensor is arranged. An imaging signal from the imaging unit is sent to the processor device 19 via the universal code 14 or the like. The processor device 19 performs various types of image processing on the image pickup signal of the image pickup unit, converts it into a video signal, and displays it on the monitor 20 as an observation image.

  The illumination window is provided with an exit end of the light guide. The light guide guides the illumination light from the irradiation light source of the light source device 18 to the illumination window. Illumination light from the illumination window is emitted toward the site to be observed in the body. The air / water supply nozzle injects air and water supplied from an air / water supply device (not shown) toward the observation window in accordance with the operation of the air / water button 22.

  The treatment instrument outlet 30 is connected to a treatment instrument insertion channel 31 disposed in the insertion section 13 and communicates with the treatment instrument introduction section 24. In the treatment instrument insertion channel 31, the suction passage 32 is branched near the treatment instrument introduction portion 24. The suction passage 32 is connected to the suction button 23. The suction button 23 is connected to a suction pump (not shown) via the universal cord 14. The suction pump is always driven when the endoscope 10 is operated. Accordingly, by pressing the suction button 23, blood, body fluid, filth, washing water and the like in the body are sucked from the suction passage 32 and the treatment instrument insertion channel 31.

  As shown in FIG. 2, the base 33 is screwed to the treatment instrument introduction unit 24. The base 33 is made of metal and is formed in a cylindrical shape. As shown in FIG. 3, a male screw portion 34, an O-ring storage groove 35, a forceps plug mounting groove 36, and an annular projecting portion 37 are formed on the outer peripheral surface 33 </ b> A of the base 33 in order from the bottom. An O-ring 38 is stored in the O-ring storage groove 35. The O-ring 38 keeps the space between the treatment instrument introducing portion 24 and the outer peripheral surface 33A of the base 33 watertight. The inner peripheral surface 33B is formed in a tapered surface shape that gradually expands toward the outer side, and serves as a guide surface. With this guide surface, the treatment instrument is smoothly guided to the treatment instrument insertion channel 31.

  The outer end portion of the base 33 in which the forceps plug mounting groove 36 and the annular protrusion 37 are formed protrudes and is exposed to the outside in a state where the base 33 is attached to the treatment instrument introducing portion 24 (see FIG. 2). The forceps plug mounting groove 36 and the annular projecting portion 37 constitute a base fitting portion 39.

  The forceps plug 40 is provided as a disposable type that is sterilized and disposable after use, and is fitted to the base 33 during use as shown in FIG. And it will be in a use condition as shown in FIG.

  As shown in FIG. 5, the forceps plug 40 includes a plug body 41, a valve member 42, and a connecting strip 43 that connects them. In the unfolded state, the plug main body 41 is formed at one end of the connecting strip 43 and the valve member 42 is formed at the other end. The plug body 41 is configured in a substantially cylindrical shape. A base receiving portion 45 is formed on the inner peripheral surface of the lower portion of the stopper main body 41, and a valve member receiving portion 46 is formed on the inner peripheral surface of the upper portion of the stopper main body 41. A partition wall 47 is formed between the base receiving part 45 and the valve member receiving part 46. A throttle passage 48 through which the treatment instrument is inserted is formed at the center of the partition wall portion 47. Further, the upper edge portion of the throttle passage 48 is cut out in a conical shape, and becomes a guide surface 49 for guiding the distal end of the treatment instrument to the throttle passage 48.

  The base receiving part 45 has an annular projecting part 51 and a circumferential groove 52. The annular protrusion 51 enters and fits into the forceps plug mounting groove 36 of the base 33. Further, the annular protrusion 37 of the base 33 is inserted into and fitted into the circumferential groove 52. The plug body 41 is detachably fixed to the base 33 by these fittings.

  The valve member 42 includes a base portion 55, a check valve portion 56, and a valve member fitting portion 57. As shown in FIG. 3, the base portion 55 is continuous with the connecting strip 43 and is formed in a disc shape. The connecting strip 43 is connected to one side edge, and the knob piece 58 is connected to the other side edge. The base portion 55 is formed with a guide surface 59 formed of a circular hole-like recess on the surface opposite to the surface on which the check valve portion 56 is formed. A slit 60 is formed in the check valve portion 56. The contact surfaces of the slit 60 are in close contact with each other, and maintain a watertight state in the close contact state. When the treatment instrument is inserted from the guide surface 59, the slit 60 is elastically deformed and opened by the insertion of the treatment instrument, and the treatment instrument can be inserted. In addition, since the slit surface is in close contact with the treatment instrument due to the elastic force of the slit 60, the treatment instrument and the valve member 42 are maintained in a watertight state, and blood or body fluid that flows backward from the body does not leak from the forceps plug 40.

  The valve member fitting portion 57 has an annular protrusion 61 and a circumferential groove 62 formed on the outer peripheral surface of the check valve portion 56. The valve member receiving portion 46 receives the valve member fitting portion 57, and includes a circumferential groove 63 into which the annular protrusion 61 of the valve member fitting portion 57 is fitted, and a circumferential groove 62 of the valve member fitting portion 57. And an annular protrusion 64 that fits. By fitting the valve member fitting portion 57 and the valve member receiving portion 46, the valve member 42 is detachably attached to the plug body 41.

  Compared with the attachment strength by the base fitting part 39 and the base receiving part 45, the attachment strength by the valve member fitting part 57 and the valve member receiving part 46 is set small. Accordingly, the forceps plug 40 does not fall off the base 33 when the knob 58 is picked up to cause the valve member 42 to remove the valve member fitting portion 57 from the valve member receiving portion 46.

  In the first embodiment, the forceps plug main body 65 is integrally formed of a water-swellable elastomer. And, in a state where it is attached to the endoscope, so as not to expand in contact with water, except for a part of the inner peripheral surface 51A of the annular projection 51 (cross hatch portion in FIG. 5) 51B, A waterproof coating layer 66 is coated on the entire surface of the forceps plug main body 65. Further, the waterproof coat layer 66 is not covered with a part 51B of the inner peripheral surface 51A. The non-waterproof portion 51B having a certain width that is not covered with the waterproof coat layer 66 becomes the liquid contact portion 67.

  The water-swellable elastomer is an elastomer whose volume expands by absorbing water, is a composite of a rubber-based basic material and a water-absorbing material, and is commercially available.

  The liquid contact part 67 is formed by arranging a masking member such as a masking tape on the non-waterproof part 51B and forming the waterproof coat layer 66 by, for example, coating. The liquid contact portion 67 is formed by removing the masking member while the waterproof coat layer 66 is dry. Further, instead of attaching the masking member, a forceps stopper holding member having a circumferential surface that contacts the masking member attachment position may be provided, and the waterproof coating layer 66 may be applied to the forceps stopper 40 using the forceps stopper holding member. . In this case, since the waterproof coat layer 66 is not applied to the portion where the forceps stopper holding member is in contact, the liquid contact portion 67 can be configured.

  As shown in FIG. 2, when the forceps plug 40 is attached to the treatment instrument introduction part 24 of the endoscope, the base fitting part 39 is fitted into the base receiving part 45, and both are brought into close contact with each other. Therefore, the forceps plug 40 does not fall off from the base 33. In addition, since the stopper main body 41 is closely attached to the base 33, the liquid contact portion 67 is isolated from the treatment instrument insertion channel 31 through the contact portion. Thereby, liquids, such as blood, a bodily fluid, a filth, and a washing | cleaning liquid, and the liquid contact part 67 do not contact. Further, since the forceps plug main body 65 is covered with the waterproof coat layer 66, expansion due to liquid suction does not occur when the endoscope is in use.

  As shown in FIG. 1, in operation, the operation unit 12 is operated, the insertion unit 13 is inserted into the subject, and the distal end of the insertion unit is positioned at a predetermined affected part, and observation and treatment are performed. When the treatment instrument 11 is used, the distal end of the treatment instrument is inserted from the slit 60 (see FIG. 2) of the forceps plug 40, and the treatment instrument 11 is inserted into the subject via the treatment instrument insertion channel 31. After the predetermined treatment is performed, the treatment tool 11 is taken out from the forceps plug 40, and then blood, body fluid, filth, and washing liquid in the subject are inhaled from the treatment tool insertion channel 31 by operating the suction button 23. Basically, the valve member 42 is used in a state of being attached to the valve member receiving portion 46. However, when inserting a weak material such as a cannulation tube from the forceps plug 40, in order to reduce the insertion resistance, The valve member 42 may be used in a state where it is removed from the valve member receiving portion 46.

  After all the operations of the endoscope are completed, the forceps plug 40 and other accessories are removed from the endoscope 10 and then placed in a cleaning machine (not shown) to be inserted into the treatment instrument insertion channel 31 and the insertion portion 13. The outer surface of the is cleaned. Normally, the forceps plug 40 is provided as a disposal type and is disposable. However, depending on some surgeons, the forceps plug 40 may be washed and used again, and may be reused in a state where washing and disinfection are not complete. In this case, there is a risk of infection to patients and surgeons, which is not preferable.

  In the first embodiment, when the forceps plug 40 is removed from the endoscope 10 and washed, the liquid contact portion 67 is disengaged from the base 33 and is exposed to the outside as shown in FIG. In this state, when cleaning is performed with water or the like, water contacts the liquid contact portion 67. Since the forceps plug body 65 is made of a water-expandable elastomer, the water-absorbing polymer inside absorbs water, and the volume is, for example, 2 as shown in (B) from the state of use shown in FIG. Swells up to about 6 times. In addition, when washing is stopped and contact with water is stopped, the absorbed water dries, and the expansion rate decreases by the amount of drying, but in a state balanced with the amount of moisture in the air as shown in (C). Keep inflated. Accordingly, the original size (A) is not restored, and the forceps plug 40 cannot be attached to the base 33, thereby preventing reuse.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, as in the first embodiment, instead of configuring the forceps plug 40 with a forceps plug main body 65 made of a water-swellable elastomer and a waterproof coat layer 66 having a liquid contact portion 67 in part, As shown in FIGS. 7 and 8, only the annular protrusion 51 in which the liquid contact portion 67 is formed uses a forceps plug 72 configured as a separate member from the forceps plug body 71 as the locking ring 70. The locking ring 70 is formed in a ring shape having a rectangular cross section by a water-soluble elastomer.

  As the water-soluble elastomer, for example, an elastomer base containing 50% or more (weight ratio) of a water-soluble polymer is used. However, the water-soluble elastomer can be deformed to such an extent that it cannot be simply dissolved in water to maintain its shape. The material is not particularly limited. For example, compressed pulp, gelatin and a mixture thereof are used. Further, it is sufficient that the locking ring 70 is elastically deformed and has an elastic force enough to be able to get over the annular projecting portion 37 and fit into the base fitting portion 39, and is not limited to an elastomer. It may be a polymer.

  As shown in FIG. 9, the locking ring 70 enters between the forceps plug main body 71 and the base 33 in a state where the forceps plug main body 71 is attached to the base 33. For this reason, as shown in FIG. 7, the forceps plug main body 71 includes a first circumferential groove 75 into which the annular projection 37 of the base fitting portion 39 is fitted, and an outer peripheral portion of the locking ring 70 enters. A double circumferential groove 76 is formed. Further, the locking ring 70 enters the forceps plug mounting groove 36 of the base 33. In addition, the same code | symbol is attached | subjected to the same structural member as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  The forceps plug main body 71 is made of an elastomer such as rubber like the conventional plug main body. In the second embodiment, since only the locking ring 70 is made of a water-soluble elastomer, the manufacture becomes easy. In use, the forceps plug 72 is fitted to the base 33, and the annular protrusion 37 of the base fitting part 39 and the first circumferential groove 75 of the forceps plug body 71 are brought into close contact with each other, whereby the locking ring 70 is secured. The liquid does not enter the container, the fitting state is maintained, and it can be used as usual.

  After the use of the endoscope, the forceps plug 72 is removed and washed, so that the locking ring 70 is made of a water-soluble material, so that it melts with water and becomes smaller or disappears. Therefore, the locking ring 70 cannot be reused. Therefore, as shown in FIG. 10, even if the forceps plug main body 71 is to be fitted to the base 33, the forceps plug main body 71 cannot be locked to the base 33 because there is no locking ring 70, and reuse is possible. Is prevented.

  In the second embodiment, the locking ring 70 is formed of a water-soluble polymer. Alternatively, the locking ring 70 may be formed of a water-swellable polymer (including a water-swellable elastomer). . Also in this case, when the forceps plug main body 71 is removed from the endoscope and cleaned, for example, water is sucked to expand and cannot be reused as the locking ring 70.

  In the above embodiment, the locking ring 70 is configured as a separate member from the forceps plug main body 71. Instead, the locking ring portion is also formed integrally with the forceps plug main body 71 by, for example, secondary molding. May be. In this case, the locking ring portion is secondarily formed using a water-soluble elastomer or a water-swellable elastomer.

  In the first embodiment, not only the plug main body 41 but also the valve member 42 and the connecting strip 43 are made of water-expandable elastomer, but only the plug main body 41 may be made of water-expandable elastomer. Further, in the first embodiment, the waterproof coat layer 66 is formed on the surface of the forceps plug body by coating. However, only the outer shell of the stopper body is formed of a normal polymer by primary molding, and then secondary molding is performed. Thus, a water expansion elastomer may be formed in the outer polymer. In this case, the outer polymer is formed with a thickness and material that can expand following the expansion of the water expansion elastomer.

  In each of the above embodiments, the liquid contact portion 67 is formed on the inner peripheral surface of the annular protrusion 51, but in order to increase the contact area with water, as shown in FIG. Water intrusion holes 80 may be provided at a predetermined pitch in the radiation direction or in any other direction. Further, instead of the water intrusion hole 80, as shown in FIG. 12, the inner peripheral surface of the locking ring 81 may be constituted by an uneven surface 82 to increase the contact area with the liquid. The concavo-convex surface 82 may be formed of ridges having a triangular cross section that is long in the direction of the cylinder as shown in the figure, or may be provided with a plurality of hemispherical or conical protrusions or holes to form the concavo-convex surface. Further, the uneven surface 82 may be formed in the liquid contact portion 67, and further, the water intrusion hole 80 and the uneven surface 82 may be used in combination.

  In each of the above-described embodiments, the forceps plug 40 is described as a plug used for the endoscope 10, but besides the forceps plug 40, the plug used for the endoscope 10 can be used as a disposable type, for example, suction. You may implement this invention with respect to a button. In this case, the plug body is made of a water-swellable elastomer and a waterproof coat layer is applied to the surface. At the time of use, it is in close contact with the endoscope 10 and is water-tightly coupled, and is removed from the endoscope 10 when it is cleaned after use. And when it removes from the endoscope 10, the part which was closely_contact | adhered to attachment parts, such as a nozzle | cap | die, will be exposed outside. A liquid contact part is formed in the part exposed to the outside in the removed state as described above, and the cleaning liquid is touched through the liquid contact part at the time of cleaning, and the plug body is expanded to change the shape and re-apply. Use is prevented. Further, even if the liquid contact portion of the stopper main body is made of a water-soluble elastomer, it can be dissolved in contact with water, and the current shape cannot be maintained, and reuse can be prevented.

  In the above embodiment, the forceps plug is attached to the treatment instrument introduction part via the base. However, in an endoscope in which the base fitting unit is integrally formed with the treatment instrument introduction part, the treatment is performed without using the base. A forceps plug may be attached to the fitting fitting portion formed integrally with the tool introduction portion.

Claims (8)

An endoscope plug body attached to an attachment portion of an endoscope,
A tubular plug body;
An attachment receiving portion that is formed on the plug body, fits into the attachment portion, and prevents movement of the plug body in the insertion / removal direction from the attachment portion;
In the state in which the mounting receiving portion is fitted to the mounting portion, the mounting receiving portion is formed at a position isolated from the liquid, and the mounting receiving portion cannot be fitted to the mounting portion in contact with the liquid. An endoscope plug body, characterized by comprising a liquid contact portion for bringing the state into a stable state. The attachment portion is a substantially cylindrical base leading to a treatment instrument insertion channel in the endoscope,
The plug has a treatment instrument insertion hole through which a treatment instrument is inserted, and a base receiving part that fits into the base is the attachment receiving part.
The liquid contact portion is formed in the base receiving portion at a position isolated from the liquid from the treatment instrument insertion channel in a state where the base receiving portion is fitted to the base. Item 1. The endoscope plug according to Item 1. The base has a base fitting portion at an outer end, and the base fitting portion has a base-side annular projecting portion projecting outward from the outer peripheral surface, and a base-side circumferential groove formed on the outer peripheral surface. Have
The base receiving portion is formed on the inner peripheral surface of the stopper main body, and is formed on the inner peripheral surface of the stopper main body, and on the inner peripheral surface of the stopper main body. A plug body-side annular projection that fits into the groove;
3. The endoscope plug according to claim 2, wherein the liquid contact portion is formed on an inner peripheral surface of the plug main body side annular projecting portion. The base has a base fitting portion at an outer end, and the base fitting portion has a base-side annular projecting portion projecting outward from the outer peripheral surface, and a base-side circumferential groove formed on the outer peripheral surface. Have
The base receiving portion is formed on the inner peripheral surface of the plug body, and has a plug body side first circumferential groove that fits into the base side annular projecting portion, and an inner diameter larger than the plug body side first circumferential groove. A stopper body-side second circumferential groove, and a stopper ring in which an outer peripheral portion is fitted into the stopper body-side second circumferential groove, and an inner peripheral portion is fitted into the cap-side circumferential groove,
3. The endoscope plug according to claim 2, wherein the liquid contact portion is formed on the locking ring.   The endoscope plug according to any one of claims 1 to 4, wherein the liquid contact portion is constituted by a water expansion member that absorbs water and expands.   The endoscope plug according to any one of claims 1 to 4, wherein the liquid contact portion is made of a water-soluble material that is soluble in water. The plug body is composed of a water expansion member that absorbs water and expands,
The endoscope plug body according to any one of claims 1 to 3, further comprising a waterproof coating layer on an outer surface of the plug body excluding the liquid contact portion.   The stopper body includes a valve member that closes the treatment instrument insertion hole from the outside, a connecting member that connects the valve member to the stopper body, and a valve member receiving portion into which the valve member is fitted. The endoscope plug body according to any one of claims 2 to 7.

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