JP4904195B2 - Endoscope forceps plug - Google Patents

Description

  The present invention relates to an endoscopic forceps plug for elastically sealing an entrance portion of a treatment instrument insertion channel so that in-vivo sewage or the like does not jet out of the endoscope through the treatment instrument insertion channel of the endoscope.

  As shown in FIG. 8, for example, a forceps plug of an endoscope is generally covered with a forceps plug body 91 whose base is attached to the entrance portion of the treatment instrument insertion channel 100 of the endoscope, and the forceps plug body 91. A substantially cap-shaped lid body 92 that is detachably attached to the state is formed of an elastic material, and a slit 93 or a small hole 94 that is pushed open by the treatment instrument inserted into the treatment instrument insertion channel 100 is formed. The closed membrane is provided on the lid 92 and the forceps plug body 91.

  An outer peripheral groove 95 is formed on the entire outer periphery of the forceps plug main body 91, and an annular inward projection 96 that is detachable with respect to the outer peripheral groove 95 is an inner peripheral portion near the opening end of the lid 92. It protrudes from the entire circumference inward.

  As a result, when the lid 92 is pushed from above and attached to the forceps plug main body 91, the inward projection 96 portion of the lid 92 is pushed and spread along the outer periphery of the forceps plug main body 91. Then, after sliding in an elastically deformed state, it engages with the outer peripheral groove 95 (for example, Patent Document 1).

  However, in the forceps plug of the endoscope as described above, as shown in FIG. 9, sudden pressure rise (so-called water hammer action) such as in-vivo sewage passing through the treatment instrument insertion channel 100 from inside the body. ) Or the like, the engagement of the inner projection 96 with respect to the outer peripheral groove 95 is released, and the lid 92 is detached from the forceps plug main body 91, and the sewage may be scattered around.

  As a countermeasure, the engagement force between the inner protrusion 96 and the outer peripheral groove 95 may be made very large so that the inner protrusion 96 does not easily come off from the outer peripheral groove 95. The lid 92 is difficult to attach to and detach from the forceps plug main body 91, and the lid 92 is likely to be damaged during the attachment and detachment.

Therefore, as shown in FIG. 10, the inventor of the present case forms the outer peripheral surface 97 of the forceps plug main body 91 in a reverse tapered shape having a diameter gradually narrowed from the top side to the base side, and the portion and the outer peripheral groove By forming the large-diameter portion 98 having a larger outer diameter than the surroundings in the portion between the cover 95 and the cover 92, the cover 92 is not easily detached by a water hammer action or the like during use, and the cover 92 is attached to the forceps plug body. An endoscopic forceps plug that can be easily attached to and detached from 91 is invented, and a patent application has already been filed (Japanese Patent Application No. 2006-337792).
JP 2001-218732 A

  In the invention described in Japanese Patent Application No. 2006-337792, the inward projection 96 portion of the lid 92 is not caught by the large diameter portion 98 during the operation of attaching the lid 92 to the forceps plug main body 91. Thus, the top side end surface 99 of both end surfaces of the large diameter portion 98 is formed in a conical surface shape (hereinafter referred to as “conical surface 99”), and the inward projection 96 can smoothly get over the large diameter portion 98. I am thinking so that I can do it.

  FIG. 11 shows a state in which the inward projection 96 of the lid body 92 has come into contact with the conical surface 99 of the forceps plug body 91 while the lid body 92 is pushed in from above and covered with the forceps plug body 91. The end surface on the inward projection 96 side that contacts the conical surface 99 is also formed in a conical hole surface shape facing the conical surface 99.

  However, when the lid 92 is further pressed against the forceps plug main body 91 from this state, the inclined surface on the inner projection 96 side is a cone on the large diameter portion 98 side, as shown in FIG. Since a large frictional resistance is generated in the portion 99 that is in perfect contact with the surface 99 (A), the inclined surface of the inward projection 96 rubs against the conical surface 99 on the large-diameter portion 98 side even if the lid 92 is further strongly inserted from above. In some cases (B), the inner protrusion 96 could not get over the large diameter portion 98 only by elastic deformation of the lid 92.

  In the present invention, the inward projection formed in the vicinity of the opening end of the substantially cap-shaped lid surely gets over the large-diameter portion formed on the outer peripheral portion of the forceps plug body, so that the lid is smooth with respect to the forceps plug body. An object of the present invention is to provide an endoscopic forceps plug that can be attached to an endoscope.

  In order to achieve the above object, a forceps plug of an endoscope according to the present invention includes a forceps plug body (11) whose base is attached to an inlet portion of a treatment instrument insertion channel (3) of the endoscope, and the forceps plug body A substantially cap-shaped lid body (12) that is detachably attached to the state covered with (11) is formed of an elastic material and inserted into the treatment instrument insertion channel (3). The closing membranes (16, 17) to be pushed open are endoscope forceps plugs provided on the forceps plug body (11) and the lid body (12), and the circumferential direction of the outer periphery of the forceps plug body (11) An outer circumferential groove (21) is formed on the outer circumferential groove (21), and an annular inner protrusion (23) that can be freely engaged with and disengaged from the outer circumferential groove (21) is formed inwardly at the opening end of the lid (12). In addition, the outer peripheral surface of the forceps plug main body (11) is from the top (11a) side to the base side. A large-diameter portion (26) having a larger outer diameter than the top portion (11a) is formed at a portion between the portion and the outer peripheral groove (21). The top side end face of both end faces of (26) is formed in a conical surface (31) shape, and when the lid (12) is attached to the forceps plug body (11), the lid (12) An internal view in which the inward projection (23) is configured to come into contact with the conical surface (31) of the forceps plug body (11) and then get over the large diameter portion (26) and engage with the outer peripheral groove (21). In the forceps plug of the mirror, the end surface of the inward projection (23) that contacts the conical surface (31) during the operation of attaching the lid (12) to the forceps plug main body (11) has a conical hole surface (32) shape. The apex angle (δ2) of the conical hole surface (32) is formed so that the end on the top side of the large diameter part (26) of the forceps plug body (11) It is formed larger than the apex angle (δ1) of the conical surface (31) formed on the surface.

  According to the present invention, the end surface of the inward projection on the lid side that contacts the conical surface on the forceps plug body side during the operation of attaching the lid to the forceps plug body is formed into a conical hole surface, and the conical hole Since the apex angle of the surface is larger than the apex angle of the conical surface on the forceps plug main body side, the inward protrusion smoothly elastically deforms in a state of sliding and spreading along the conical surface. The inward projection formed in the vicinity of the opening end surely gets over the large-diameter portion formed on the outer periphery of the forceps plug body, and the lid can be smoothly attached to the forceps plug body.

  A material in which both the forceps plug body whose base is attached to the entrance portion of the treatment instrument insertion channel of the endoscope and the substantially cap-shaped lid body that is detachably attached to the forceps plug body are elastic. The closure film formed by the pusher and opened by the treatment tool inserted into the treatment tool insertion channel is an endoscope forceps plug provided on the forceps plug body and the lid body. An outer circumferential groove is formed in the circumferential direction, and an annular inward projection that can be freely engaged with and disengaged from the outer circumferential groove is formed to project inward at the opening end of the lid, and the outer circumferential surface of the forceps plug body Is formed in a reverse taper shape in which the diameter gradually narrows from the top side to the base side, and a large-diameter portion having a larger outer diameter than the top portion is formed between the portion and the outer peripheral groove, and both end surfaces of the large-diameter portion And the top side end surface is formed in a conical surface, and the lid is When the endoscope is configured to be attached to the main body of the stopper, the inner protrusion of the lid contacts the conical surface of the main body of the forceps stopper and then goes over the large diameter portion and engages with the outer peripheral groove. In the forceps plug, the end surface of the inward projection that contacts the conical surface during the operation of attaching the lid to the forceps plug body is formed in a conical hole surface, and the apex angle of the conical hole surface is It is formed larger than the apex angle of the conical surface formed on the top side end surface of the large diameter portion.

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 5, reference numeral 1 denotes an insertion part of a flexible endoscope, and 2 denotes an operation part connected to the proximal end of the insertion part 1.

  A treatment tool insertion channel 3 for inserting a treatment tool (not shown) is inserted through the entire length of the insertion portion 1, and the entrance of the treatment tool insertion channel 3 disposed near the lower end of the operation portion 2. A forceps plug 10 is attached to the opening to prevent in-vivo sewage flowing backward through the treatment instrument insertion channel 3 from blowing out. Reference numeral 11 denotes a forceps plug body, and 12 and 14 denote a lid and a connecting band-like member which will be described later.

  FIGS. 1 and 2 are a longitudinal sectional view and a perspective view of the forceps plug 10 with the lid 12 removed from the forceps plug body 11, and FIGS. 3 and 4 show the lid 12 attached to the forceps plug body 11. It is the longitudinal cross-sectional view and perspective view of the forceps stopper 10 of the attached state.

  As shown in FIG. 3, the forceps plug 10 includes a forceps plug main body 11 formed in a substantially cylindrical shape that is detachably attached to the inlet cap 3 a of the treatment instrument insertion channel 3, and a treatment on the top portion 11 a of the forceps plug main body 11. A substantially cylindrical cap-like lid body 12 that is detachably attached to the forceps plug body 11 from the tool insertion port 15 side is provided, and the whole is made of an elastic rubber material or the like.

  A constricted portion 13 that is detachable with respect to the inlet cap 3a of the treatment instrument insertion channel 3 is formed in a portion near the proximal end of the inner surface of the forceps plug main body 11, and the constricted portion 13 is elastically deformed to enter the inlet. The base 3a can be attached and removed in a tightened state.

  The lid body 12 is connected to the base portion of the forceps plug body 11 with a forceps plug body 11 and a connecting band-shaped member 14 formed integrally with the lid body 12, and even if the lid body 12 is removed from the forceps plug body 11. It is designed to be hung nearby.

  Closure films 16 and 17 are formed in the forceps plug body 11 and the lid body 12, respectively, and the closure film 16 in the forceps plug body 11 is pushed open by a treatment tool inserted into the treatment tool insertion channel 3. A small hole 18 is formed, and a slit 19 that is pushed open by a treatment instrument inserted into the treatment instrument insertion channel 3 is formed in the closing film 17 of the lid 12. However, the combination of the small hole 18 and the slit 19 may be appropriate.

  As a result, in the state shown in FIG. 3 in which the lid 12 is attached to the forceps plug body 11 and the treatment tool is not used, the slit 19 formed in the closure film 17 of the lid 12 causes the treatment tool insertion channel 3 to Sealed so that internal sewage or the like is not ejected.

  When a treatment tool (not shown) is inserted into and removed from the treatment tool insertion channel 3, the space between the outer periphery of the treatment tool is sealed by the small hole 18 and the slit 19, and the drug solution is placed in the treatment tool insertion channel 3 by a syringe. For example, the small diameter portion 20 formed in the inlet portion of the lid body 12 tightens the distal end portion of the syringe barrel to support and seal the syringe.

  An outer circumferential groove 21 is formed in the circumferential direction in a state where the outer circumferential groove 21 is recessed over the entire circumference on the outer circumferential portion near the proximal end of the forceps plug body 11. And the annular wall 22 is formed in the cover body 12 side in the state surrounding the outer periphery of the forceps plug main body 11, and the annular inward projection 23 that can be engaged with the outer peripheral groove 21 over the entire periphery is formed in the annular wall. 22 is formed so as to project inward (inward in the radial direction) from the entire inner periphery of the opening end 22b.

  The inward projection 23 can be elastically deformed to disengage the annular wall 22 from the outer peripheral groove 21, and the inner protrusion 23 is engaged with the outer peripheral groove 21, so that the lid 12 is removed from the forceps plug main body 11. It will be a stopper that prevents it from coming off.

  The upper half of the outer peripheral portion of the forceps plug main body 11 is a reverse tapered cylindrical portion 29 having a diameter gradually narrowed from the top portion 11a side, and the inner peripheral surface (that is, the cover 12 covering the reverse tapered cylindrical portion 29) The upper half portion of the inner peripheral surface of the annular wall 22 does not tighten the forceps plug body 11 at the top 11a of the forceps plug body 11, and the tightening amount with respect to the forceps plug body 11 as the distance from the top 11a increases in the reverse tapered tube section 29. This is a reverse tapered hole 30 in which becomes larger.

  In order to do so, as shown in FIG. 1, the inner diameter D of the top portion of the reverse tapered hole portion 30 of the lid 12 is formed to be equal to or larger than the outer diameter d of the top portion 11 a of the forceps plug body 11. The taper angle θ <b> 2 of the tapered hole portion 30 is formed larger than the taper angle θ <b> 1 of the reverse taper cylindrical portion 29. That is, D ≧ d and θ2> θ1.

  A large-diameter portion 26 having an outer diameter larger than that of the periphery is formed at a position between the reverse tapered tube portion 29 and the outer peripheral groove 21 at an intermediate portion of the outer peripheral portion of the forceps plug main body 11. The outer diameter e of the large diameter portion 26 is larger than the outer diameter of the forceps plug main body 11 and the outer diameter d of the top portion 11a, and e> d in FIG.

  The apex side end surface 31 of both end surfaces of the large diameter portion 26 is formed in a conical surface shape whose upper portion is narrowed (hereinafter referred to as “conical surface 31”). , Δ1 as shown in FIG. Further, the outer diameter of the conical surface 31 = the outer diameter e of the large-diameter portion 26.

  Further, the opening end surface of the inward projection 23 on the side of the lid 12 that contacts the conical surface 31 during the operation of attaching the lid 12 to the forceps plug body 11 (that is, the inner peripheral edge of the lower end surface of the annular wall 22). Is formed in the shape of a cone-shaped conical hole whose upper part is narrowed on the entire circumference (hereinafter referred to as “conical hole surface 32”), and its apex angle is δ2 as shown in FIG. .

  The apex angle δ2 of the conical hole surface 32 formed as described above is formed larger than the apex angle δ1 of the conical surface 31. That is, δ2> δ1. Further, the inner diameter E of the opening end portion of the conical hole surface 32 is formed larger than the outer diameter e of the conical surface 31. That is, E> e.

  It should be noted that the outer peripheral portion of the forceps plug main body 11 and the annular wall of the lid body 12 when the inner projection 23 of the lid body 12 is elastically deformed and slides at one or a plurality of outer circumferential portions of the large diameter portion 26. A ventilation groove 27 is formed to communicate the space surrounded by 22 with the outside.

  As shown in FIG. 3, the forceps plug 10 of the endoscope according to the embodiment configured as described above has the inner protrusion 23 formed on the outer peripheral groove 21 in a state where the lid 12 is attached to the forceps plug body 11. The lid 12 is prevented from being detached from the forceps plug main body 11, and the reverse taper cylindrical portion 29 of the forceps plug main body 11 is fastened by the reverse taper hole 30 of the lid 12, so that the portion is surely secured. It is in a sealed state.

  When the forceps plug 10 is attached to the inlet cap 3a of the treatment instrument insertion channel 3 and the pressure in the lid 12 suddenly increases due to a water hammer effect or the like passing through the treatment instrument insertion channel 3, the lid 12 is removed. A strong force to pull the forceps plug body 11 from above acts on the forceps plug body 11, thereby increasing the amount of tightening of the reverse tapered hole portion 30 of the lid 12 with respect to the reverse tapered tube portion 29 of the forceps plug body 11. .

  As a result, not only the engagement force between the outer circumferential groove 21 and the inward projection 23 but also the reverse taper hole portion 30 with respect to the reverse taper cylindrical portion 29 as a retaining force for preventing the lid body 12 from coming out of the forceps plug body 11. The increase in the tightening force acts directly, and the lid 12 does not come off the forceps plug body 11. Therefore, even if there is a water hammer effect, the body sewage or the like is not ejected from the forceps plug 10.

  As shown in FIG. 6, the conical hole surface 32 on the lid body 12 side is conical surface 31 on the forceps plug body 11 side in the middle of the operation in which the lid body 12 is pushed from above and attached to the forceps plug body 11. In the state of contact with the conical surface, the conical hole surface 32 does not come into close contact with the conical surface 31 as shown in FIG. Δ = (δ2−δ1) / 2 (A).

  Therefore, since the frictional resistance generated between the conical hole surface 32 on the lid 12 side and the conical surface 31 on the forceps plug body 11 side is small, if the lid 12 is further pressed against the forceps plug body 11 from above, As shown in FIG. 3, the inward protrusion 23 gets over the large-diameter portion 26 at the next moment and smoothly deforms elastically in a state where the outward protrusion 23 slides and spreads along the conical surface 31. To be engaged with the outer peripheral groove 21. In this way, the lid 12 is smoothly attached to the forceps plug body 11.

  When removing the lid body 12 from the forceps plug main body 11 alone, the annular wall 22 is barrel-shaped if the lid body 12 is not pulled up from the upper side but is pushed up from the inward projection 23 side of the lower end. In the state where the forceps plug main body 11 is attached to the inlet cap 3a of the treatment instrument insertion channel 3, the lid-shaped portion of the lid body 12 is pulled up or removed, or the annular wall 22 is removed laterally. , The inner protrusion 23 serves as a fulcrum, and the moment acts, so that both the forceps plug body 11 and the lid body 12 are elastically deformed and can be easily removed.

It is a longitudinal cross-sectional view of the state in which the lid body of the forceps plug of the endoscope of the embodiment of the present invention is removed from the forceps plug body. It is an external appearance perspective view in the state where the lid of the forceps plug of the endoscope of the embodiment of the present invention was removed from the forceps plug body. It is a longitudinal cross-sectional view of the state in which the lid body of the forceps plug of the endoscope of the embodiment of the present invention is attached to the forceps plug body. It is an external appearance perspective view of the state where the lid of the forceps plug of the endoscope of the embodiment of the present invention is attached to the forceps plug body. 1 is a side view showing an overall configuration of an endoscope according to an embodiment of the present invention. It is a longitudinal cross-sectional view which shows the state in the middle of the lid body of the forceps plug of the endoscope of the Example of this invention being attached to a forceps plug main body. It is a partial expanded sectional view of the state in the middle of the lid body of the forceps plug of the endoscope of the Example of this invention being attached to a forceps plug main body. It is a longitudinal cross-sectional view of a forceps plug of a conventional endoscope. It is a longitudinal cross-sectional view of a state in which water hammer has acted on a forceps plug of a conventional endoscope. It is a longitudinal cross-sectional view of the forceps plug of the endoscope of the prior application invention. It is a longitudinal cross-sectional view which shows the state in the middle of the lid body of the forceps plug of the endoscope of a prior application invention being attached to the forceps plug body. It is a partial expanded sectional view of the state in the middle of the lid body of the forceps plug of the endoscope of the prior application invention being attached to the forceps plug body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Treatment tool insertion channel 10 Forceps plug 11 Forceps plug main body 11a Top part 12 Cover body 16 Closure film 17 Closure film 21 Outer peripheral groove 23 Inward protrusion 26 Large diameter part 31 Conical surface 32 Conical hole surface δ1 Conical surface apex angle δ2 Conical hole Apex angle of surface

Claims (1)

A forceps plug main body (11) whose base is attached to the entrance of the treatment instrument insertion channel (3) of the endoscope, and a substantially cap-shaped lid that is detachably attached to the forceps plug main body (11). The forceps plug main body (11) includes a closure membrane (16, 17) that is formed of an elastic material together with the body (12) and is pushed open by the treatment instrument inserted into the treatment instrument insertion channel (3). And a forceps plug of an endoscope provided on the lid (12),
An outer circumferential groove (21) is formed in the circumferential direction of the outer circumferential portion of the forceps plug body (11), and an annular inward projection (23) that can be engaged with and disengaged from the outer circumferential groove (21) is formed on the lid ( 12) projecting inwardly toward the opening end, and the outer peripheral surface of the forceps plug body (11) is formed in a reverse taper shape whose diameter gradually narrows from the top (11a) side to the base side. A large-diameter portion (26) having a larger outer diameter than the top portion (11a) is formed in a portion between the portion and the outer peripheral groove (21).
When the top side end surface of both end surfaces of the large diameter portion (26) is formed in a conical surface (31) shape, and when the lid (12) is attached to the forceps plug body (11), The inward projection (23) of the lid (12) abuts on the conical surface (31) of the forceps plug body (11) and then climbs over the large-diameter portion (26) into the outer peripheral groove (21). In an endoscopic forceps plug configured to engage,
An end surface of the inward projection (23) that abuts on the conical surface (31) during the operation of attaching the lid (12) to the forceps plug body (11) is formed in a conical hole surface (32) shape. The apex angle (δ2) of the conical hole surface (32) is the apex angle (δ1) of the conical surface (31) formed on the end surface on the apex side of the large diameter portion (26) of the forceps plug body (11). An endoscopic forceps plug characterized by being formed larger.

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