JP5024988B2 - 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. 9, for example, the forceps plug of the endoscope is generally a substantially cylindrical forceps plug main body 91 whose base is attached to the inlet base of the treatment instrument insertion channel 100 of the endoscope, and the forceps plug main body 91. A treatment instrument inserted into the treatment instrument insertion channel 100, which is formed of an elastic member together with a substantially cap-shaped lid body 92 that is detachably attached to the forceps plug main body 91 from the upper end side thereof. Closure membranes 95 and 96 in which slits 93 or small holes 94 that are pushed open by the above are formed on the lid 92 and the forceps plug main body 91.

Then, in order to detachably engage the lid 92 with the forceps plug body 91, a circumferential groove 99 is formed on the outer periphery of the forceps plug body 91, and the lid body surrounds the forceps plug body 91. An annular inward projection 98 that can be engaged with and disengaged from the circumferential groove 99 is formed on the inner peripheral portion of the annular wall 97 projecting from the 92 side, and the circumferential groove 99 and the inward projection are formed. 98 is a retaining engagement portion that can be engaged and disengaged by elastically deforming the lid 92 (for example, Patent Document 1).
JP 2001-218732 A

  However, in the endoscopic forceps plug as described above, as shown in FIG. 10, sudden pressure increase (so-called water hammer action) such as internal sewage passing through the treatment instrument insertion channel 100 from inside the body. ) Or the like, the engagement of the inward protrusion 98 with the circumferential groove 99 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 98 that is a retaining engagement portion and the circumferential groove 99 may be increased so that the inner protrusion 98 is not easily detached from the circumferential groove 99. However, simply doing so makes it difficult to attach / detach the lid 92 to / from the forceps plug main body 91, and causes problems such as the lid 92 being easily damaged during attachment / detachment.

  According to the present invention, even if there is a water hammer effect due to internal sewage through the treatment instrument insertion channel, the lid is difficult to come off from the forceps plug body, so that no spilled liquid is ejected, and the lid is smoothly attached to the forceps plug body. An object of the present invention is to provide an endoscopic forceps plug.

  In order to achieve the above object, the forceps plug of the endoscope according to the present invention includes a substantially cylindrical forceps plug body whose base is attached to an entrance portion of the treatment instrument insertion channel of the endoscope, and an upper end side of the forceps plug body. A body closure that is formed by a resilient member together with a substantially cap-like lid that is removably attached to the forceps plug body from above and is pushed open by a treatment instrument inserted into a treatment instrument insertion channel A membrane and a lid closing membrane are provided on the forceps plug body and the lid, and the outer periphery of the forceps stopper body and the inner periphery of the lid can be engaged and disengaged by elastically deforming the lid. In an endoscopic forceps plug with a locking engagement part, the space inside the forceps plug body located on the back side of the body closure membrane rotates the shape of the upper half of the heart shape around its vertical axis. The heart-shaped concave formed in the shape of a rotating body Part of the wall corresponding to is one that has become the main body closing film.

  The main body closing membrane is preferably formed with a small hole that is normally closed and elastically deformed by a treatment instrument passing therethrough. Further, the lid may be covered with a state in which the forceps plug main body is tightened from the outside. In this case, a reverse tapered surface portion having a diameter gradually narrowed from the upper end side is formed on the outer peripheral surface of the forceps plug main body. In addition, the inner peripheral surface of the lid covering the reverse tapered surface portion does not tighten the forceps plug main body at the upper end portion of the forceps plug main body, and the reverse taper portion increases the tightening amount with respect to the forceps plug main body as the distance from the upper end portion increases. It may be formed in a tapered hole shape.

  Further, the retaining engagement portion has a circumferential groove that is recessed from the outer peripheral surface at a position lower than the reverse tapered surface portion of the outer peripheral portion of the forceps plug body, and the circumferential groove by elastically deforming the lid. It may be formed of an inward projection that protrudes inward from the lid so that it can be engaged and disengaged.

  According to the present invention, the space inside the forceps plug main body located on the back side of the main body closing membrane is formed in a rotating body shape having a substantially heart-shaped upper half portion rotated around its vertical axis, and the heart Because the wall of the part corresponding to the concave part is a main body closing membrane, even if there is a water hammer effect due to internal dirt fluid through the treatment instrument insertion channel, the engagement force of the lid to the forceps plug main body and the main body closing Since the closing force of the membrane increases, it is difficult for the lid to come off from the forceps plug main body, so that no effluent is ejected, and the lid can be smoothly attached to and detached from the forceps plug main body as usual.

  A substantially cylindrical forceps plug main body whose base is attached to the entrance portion of the treatment instrument insertion channel of the endoscope, and a substantially cap-shaped removably attached to the forceps plug main body from the upper end side of the forceps plug main body Both the lid body is formed of an elastic member, and a main body closing film and a lid body closing film that are pushed open by a treatment instrument inserted into the treatment instrument insertion channel are provided on the forceps plug body and the lid body, An endoscope forceps plug in which a retaining engagement portion that can be engaged and disengaged by elastically deforming the lid body is formed on the outer circumference portion of the forceps plug body and the inner circumference portion of the lid body. The space inside the forceps plug body located on the back side of the membrane is formed into a rotating body that rotates the shape of the upper half of the substantially heart shape around its longitudinal axis, and the wall of the portion that corresponds to the recess of the heart shape It is a body closure membrane.

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 instrument insertion channel 3 for inserting a treatment instrument (not shown) is inserted through the entire length of the insertion section 1, and the entrance opening of the treatment instrument insertion channel 3 disposed at the lower end of the operation section 2. A forceps plug main body 11 of a forceps plug 10 is detachably attached to the section so as to prevent body sewage or the like flowing backward through the treatment instrument insertion channel 3 from blowing out. Reference numerals 12 and 14 denote a lid and a connecting belt-like member which will be described later.

  1 and 2 are a longitudinal sectional view and a perspective view of the forceps plug 10. 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 the forceps plug main body 11 from the protruding end side entrance 15 side of the upper end of the forceps plug main body 11. And a substantially cap-like lid body 12 that is detachably attached in a state where it is covered, and the whole is made of an elastic rubber material or the like.

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

  The lid 12 is connected to the base portion of the forceps plug body 11 by a connecting band-like member 14 formed integrally with the lid 12 by an elastic rubber material. As shown in FIGS. 3 and 4, Even if the lid 12 is removed from the forceps plug body 11, it is hung in the vicinity thereof.

  Returning to FIG. 1, a main body closing film 16 and a lid closing film 17 are formed in the forceps plug main body 11 and the lid body 12, and the main body closing film 16 is inserted into the treatment instrument insertion channel 3. A small hole 18 that is pushed open by the treatment instrument is formed, and a slit 19 that is pushed open by the treatment instrument inserted through the treatment instrument insertion channel 3 is formed in the lid closing film 17. The small hole 18 is normally closed and is formed in an open state by being elastically deformed by a treatment instrument passing therethrough.

  Therefore, in the state shown in FIG. 1 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 lid closing film 17 and the small hole 18 formed in the body closing film 16. Thus, sealing is performed so that the in-vivo sewage or the like is not ejected from the treatment instrument insertion channel.

  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 treatment tool insertion channel 3 is filled with a syringe. In the case of feeding a medical solution or the like, the small diameter portion 20 formed at the inlet portion of the lid body 12 tightens the distal end portion of the syringe barrel, thereby supporting and sealing the syringe.

  A circumferential groove 21 is formed on the outer peripheral portion of the forceps plug main body 11 near the base end so as to be recessed from the outer peripheral surface over the entire periphery. An annular wall 22 is formed on the lid 12 side so as to surround the outer periphery of the forceps plug body 11, and an annular inward protrusion 23 that can be engaged with the circumferential groove 21 over the entire circumference is formed in the annular wall. 22 is formed so as to project inward from the entire circumference of the inner circumferential portion of the tip portion.

  The inward projection 23 can elastically deform the annular wall 22 to be engaged with and disengaged from the circumferential groove 21, and a retaining engagement portion for preventing the lid body 12 from coming off from the forceps plug body 11 has a circular shape. A circumferential groove 21 and an inward projection 23 are included.

  The upper half of the outer peripheral portion of the forceps plug body 11 is a reverse tapered surface portion 29 having a diameter gradually narrowed from the upper end portion 28 side, and the inner peripheral surface of the lid 12 covering the reverse tapered surface portion 29 (that is, The upper half part of the inner peripheral surface of the annular wall 22 does not tighten the forceps plug body 11 at the upper end portion 28 of the forceps plug body 11, and tightens the forceps plug body 11 as it moves away from the upper end portion 28 at the reverse tapered surface portion 29. This is a reverse tapered hole 30 in which becomes larger.

  To do so, as shown in FIG. 3, the inner diameter D of the upper end portion of the reverse tapered hole portion 30 of the lid body 12 is formed to be equal to or larger than the outer diameter d of the upper end portion 28 of the forceps plug body 11, The taper angle θ <b> 2 of the reverse taper hole portion 30 is formed larger than the taper angle θ <b> 1 of the reverse taper surface portion 29. That is, D ≧ d and θ2> θ1.

  A large-diameter portion 26 having a diameter larger than that of the upper end portion 28 is formed in an intermediate portion of the outer peripheral portion of the forceps plug main body 11, and the above-described circumferential groove 21 is adjacent to the base side of the large-diameter portion 26 over the entire circumference. It is formed in a recess.

  The outer peripheral portion of the large-diameter portion 26 is surrounded by the outer peripheral portion of the forceps plug body 11 and the annular wall 22 of the lid body 12 when the inward projection 23 portion of the lid body 12 is elastically deformed and slides. A ventilation groove 27 is formed to communicate the space with the outside.

  The space inside the forceps plug main body 11 (main body space 35) located on the back side of the main body closing membrane 16 is formed in a rotating body shape in which the shape of the upper half of a substantially heart shape is rotated around its vertical axis. The wall of the portion corresponding to the heart-shaped recess is the main body closing film 16.

  As shown in FIG. 1, the forceps plug 10 of the endoscope according to the embodiment configured as described above has the inner protrusion 23 formed in the circumferential groove when the lid 12 is attached to the forceps plug body 11. 21 is engaged with the forceps plug body 11 to prevent the lid body 12 from coming off, and the reverse taper surface portion 29 of the forceps plug body 11 is tightened by the reverse taper hole portion 30 of the lid body 12 so that the portion is surely secured. It is in a sealed state.

  Then, as shown in FIG. 6, when the forceps plug 10 is attached to the inlet cap 3 a of the treatment instrument insertion channel 3, it is put in the main body internal space 35 by a water hammer action or the like passing through the treatment instrument insertion channel 3. When a high-pressure liquid flow enters, the liquid flow flows along the heart-shaped curved wall of the main body inner space 35.

  Then, as shown in FIG. 7, the component force of the force F against which the water flow hits the main body closing film 16 acts so as to close the small hole 18, so that the water flow hardly passes through the small hole 18, and the lid body 12. The pressure rise in the tip side inlet 15 of the forceps plug body 11 facing the inside is suppressed.

  Further, as shown in FIG. 8, in the portion where the water flow flows along the heart-shaped curved wall of the main body inner space 35, the forceps plug body 11 made of an elastic member is pushed outward by the force of the water flow. Since the outer peripheral surface of the reverse taper surface portion 29 of the forceps plug body 11 is expanded as shown by a broken line by being elastically deformed to the state, the reverse taper surface portion 29 is tightened by the reverse taper hole portion 30 formed in the lid body 12. The force increases, and the lid 12 is difficult to come off from the forceps plug body 11. As a result, even if there is a water hammer effect, the lid 12 does not come off from the forceps plug body 11 and the in-body sewage or the like does not spout from the forceps plug 10.

  Thus, in the present invention, the lid 12 can be prevented from being detached from the forceps plug body 11 by the water hammer action without increasing the engagement force between the circumferential groove 21 and the inward projection 23. .

It is a longitudinal cross-sectional view of the forceps plug of the endoscope of the Example of this invention. It is an external appearance perspective view of the forceps stopper of the endoscope of the Example of this invention. 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. 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 in the state where the water hammer acted on the forceps plug of the endoscope of the embodiment of the present invention. It is sectional drawing of the main body closing membrane part of the state which the water hammer acted on the forceps stopper of the endoscope of the Example of this invention. It is sectional drawing of the space part in a main body of the state which the water hammer acted on the forceps stopper of the endoscope of the Example of this invention. 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.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Treatment tool insertion channel 3a Inlet cap 10 Forceps stopper 11 Forceps stopper main body 12 Lid body 16 Main body closing film 17 Lid closing film 18 Small hole 19 Slit 21 Circumferential groove 22 Annular wall 23 Inward protrusion 29 Reverse taper surface part 30 Reverse taper Hole 35 body space

Claims (2)

A substantially cylindrical forceps plug main body whose base is attached to the entrance portion of the treatment instrument insertion channel of the endoscope, and a substantially cap removably attached to the forceps plug main body from the upper end side of the forceps plug main body The body closure membrane and the lid closure membrane, both of which are formed by elastic members and pushed by the treatment instrument inserted into the treatment instrument insertion channel, are the forceps plug body and the lid body. An internal view in which a retaining engagement portion is formed on the outer peripheral portion of the forceps plug body and the inner peripheral portion of the lid body, and can be engaged and disengaged by elastically deforming the lid body. In the forceps plug of the mirror,
The lid is put in a state of tightening the forceps plug body from the outside,
The outer peripheral surface of the forceps plug body is formed with a reverse taper surface portion whose diameter is gradually narrowed from the upper end side, and the inner peripheral surface of the lid covering the reverse taper surface portion is the upper end portion of the forceps plug body In the reverse taper surface portion is not tightened the forceps plug body, and is formed in a reverse taper hole shape in which the tightening amount with respect to the forceps plug body increases as the distance from the upper end portion increases.
Space of the forceps plug body positioned on the back side of the body closure film, rotates the half of the shape on the substantially heart-shaped a protruding end is substantially semicircular projecting portion of obliquely upward around its longitudinal axis The tip of the diagonally protruding portion in the heart shape is arranged toward the reverse taper surface portion of the forceps plug body, and the wall of the portion corresponding to the heart-shaped recess is the body. they become obturator membrane, the center position of the body closing film, usually closed, an endoscope, characterized that you have small holes are formed to open is elastically deformed by the treatment instrument therethrough Forceps stopper. The retaining engagement portion includes a circumferential groove formed to be recessed from the outer circumferential surface at a position below the reverse tapered surface portion of the outer circumferential portion of the forceps plug body, and the circumferential groove by elastically deforming the lid body. The endoscopic forceps plug according to claim 1 , wherein the forceps plug is formed of an inward projection that protrudes inward from the lid so that the lid can be engaged with and disengaged from the lid.

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