JP2002102156A - Forceps plug for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forceps plug for an endoscope having good sealability when a treating implement is drawn out and an internal contaminant liquid hard to leak even when a biopsy forceps or the like is inserted or removed. SOLUTION: A first enclosed film 14 to be pushed and opened elastically by the treating implement normally maintained in a closed state by its own elasticity and passing there and a second enclosed film 26 closely contacted with the outer surface of the passing implement to seal there are disposed separately at 2.5 times as long as the diameter of a treating implement inserting channel 3 between both the films 14 and 26 with the film 26 used as an inlet side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forceps stopper of an endoscope which is disposed at an entrance of a treatment tool insertion channel of the endoscope.

[0002]

2. Description of the Related Art A forceps stopper of an endoscope seals an entrance portion of a treatment tool insertion channel so that in-vivo contaminants or the like are not spouted through the treatment tool insertion channel in a normal state where the treatment tool is not used. When the treatment tool is inserted into and removed from the treatment instrument insertion channel, no operation is required to open and close the entrance, and the treatment instrument must be sealed so that contaminants and the like in the body are not spouted by the insertion and removal of the treatment tool.

[0003] Therefore, the simplest configuration of a conventional endoscope forceps plug is one in which a rubber-made closing membrane having a negative slit is arranged at the entrance of the treatment instrument insertion channel.

[0004] Further, the closing membrane may be double overlapped (Japanese Utility Model Application Laid-Open No. 61-54801), or the first closing membrane having a negative slit may be arranged on the inlet side, and a round hole may be provided in the back. In which a second closing membrane formed with a film is arranged (US Pat. No. 48
09679) and the like.

[0005]

However, a forceps plug provided with only a closing membrane having a-shaped slit has a distal end portion of the treatment tool when the treatment tool is pulled out of the treatment tool insertion channel. During the time delay until the slit closes at the moment when it comes off the slit, the body waste fluid spouts.

[0006] Further, the double-layered closing membrane does not make much difference in that the body fluid spouts when the treatment tool is pulled out of the treatment tool insertion channel, and the above-mentioned US Patent No. 4,809,679 is disclosed. The same phenomenon occurs when the distal end of the treatment tool comes out of the closing membrane in which the-shaped slit on the entrance side is formed.

As shown in FIG. 6, a biopsy forceps 50, which is the most common treatment tool for an endoscope, is provided with a slit 52 near the distal end thereof for holding a link mechanism 51 therebetween. Therefore, when the slit 52 passes through the closing membrane 90, as shown by the arrow A, there is a case where the body waste fluid squirts through the slit 52.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a forceps stopper for an endoscope which has a good sealing property when removing a treatment tool, and hardly leaks body fluids when inserting or removing a biopsy forceps or the like. .

[0009]

In order to achieve the above object, a forceps plug of an endoscope according to the present invention is normally closed by its own elasticity at the entrance of a treatment instrument insertion channel of the endoscope. A first closure membrane that is resiliently pushed open by a treatment tool passing therethrough and a second closure membrane that is in close contact with the outer surface of the passing treatment instrument to seal therewith, With the closing membrane on the inlet side, the two closing membranes are arranged at a distance of at least 2.5 times the diameter of the treatment instrument insertion channel.

[0010] It is preferable that a minus-shaped slit is formed in the treatment tool passage portion of the first closing film and a minus-shaped slit or a round hole is formed in the treatment tool passage portion of the second closure film. Sealing property is obtained.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows an endoscope in which a base end of an insertion section 1 covered with a flexible tube is connected to a lower end of an operation section 2.

The distal end of the treatment instrument insertion channel 3 inserted and arranged in the insertion section 1 is opened to the outside at the tip of the insertion section 1, and the forceps plug 10 arranged at the entrance of the treatment instrument insertion channel 3 is moved by the operation section 2. Projecting obliquely upward from the lower end portion of the.

As shown in FIG. 1, the forceps stopper 10 is removably attached to an inlet mouthpiece 30 provided at the inlet end of the treatment instrument insertion channel 3, and is formed of a resilient rubber material or the like. An upper half cylinder 12 made of a similar material is detachably attached to the lower half cylinder 11 thus formed.

The lower half cylinder 11 has an elastic projection 13 projecting inward from an inner surface of the lower end thereof and fitted into a circumferential groove 32 formed near the mouth of the inlet mouthpiece 30. The lower half cylinder 11 can be attached to and detached from the inlet mouthpiece 30 by elastically deforming the periphery of the lower cylinder 11 and engaging and disengaging it from the circumferential groove 32.

In the lower half cylinder 11, a first closing film 14 having a slit 15 formed in the center is formed facing the opening end of the inlet mouthpiece 30. The slit 15 maintains a closed state due to the elasticity of the closing membrane 14 in a normal state where the treatment tool is not used, and the inside of the treatment tool insertion channel 3 and the outside are sealed. Then, the slit 15 is elastically pushed open by the treatment tool inserted into and removed from the treatment tool insertion channel 3.

The upper half cylinder 12 is removably fitted into the opening of the lower half cylinder 11 from the outside, and a flange 24 projecting from the tip of the fitting portion of the upper half cylinder 12 has a lower part. Half cylinder 1
It is configured to be freely engageable and disengageable with a step 17 formed on the inner periphery of the opening 1.

When the flange 24 is engaged with the step 17 by elastically deforming the upper half cylinder 12 side, the upper half cylinder 12
Is locked in the opening of the lower half-cylinder body 11, and the upper half-cylinder body 12 is removed from the opening of the lower half-cylinder body 11 by elastically deforming the flange portion 24 and removing it from the step portion 17. be able to.

The surface portion of the upper half cylinder 12 is the second closing film 2
6 and a round hole 27 is formed in the center thereof. However, a negative slit may be formed instead of the round hole 27.

When the treatment tool inserted into and removed from the treatment tool insertion channel 3 passes through the round hole 27, the round hole 27 is elastically pushed open by the treatment tool and closely contacts the outer peripheral surface of the treatment tool.
The inside between the treatment tool insertion channel 3 and the outside is sealed by the second closing film 26.

The first closing film 14 and the second closing film 26
An interval L (L ≧ 2. L) that is at least 2.5 times the diameter (inner diameter) D of the treatment instrument insertion channel 3 with the second closing membrane 26 as the entrance side.
5D).

However, the distance L between the two closing films 14 and 26
Is too far away, the insertion operability of the treatment tool is reduced.
It is desirable that the range is ≦ 10D. The diameter D of the treatment instrument insertion channel 3 is, for example, about 2 to 3 mm.

FIG. 3 shows a tubular endoscope treatment tool 40.
Shows the state at the moment when the distal end of the tubular treatment tool 40 comes out of the slit 15 of the first closure film 14 when the is removed from the treatment device insertion channel 3, and the round hole of the second closure film 26 Since the portion 27 is in close contact with the outer peripheral surface of the sheath of the tubular treatment tool 40, even if the slit 15 of the second closing film 14 is closed late, the body fluid does not squirt.

When the distal end of the tubular treatment tool 40 comes off the round hole 27 of the second closing film 26, the slit 15 of the first closing film 14 is closed as shown in FIG. In addition, the body fluid does not squirt out of the treatment tool insertion channel 3.

FIG. 4 shows a state at the moment when the tip of the biopsy forceps 50 comes out of the slit 15 of the first closing membrane 14 when the biopsy forceps 50 is extracted from the treatment instrument insertion channel 3.

As described above, the first closing film 14 and the second closing film 26 are arranged at an interval L that is 2.5 times or more the diameter (inner diameter) D of the treatment instrument insertion channel 3. A slot 52 in which the link mechanism 51 of the biopsy forceps 50 is held.
The portion has not reached the second closing membrane 26.

As a result, since the round hole 27 of the second closing membrane 26 is in close contact with the outer peripheral surface of the cylindrical portion of the biopsy forceps 50, no leakage occurs from the round hole 27, and Even if there is a delay in closing the slit 15 of the closing film 14, the body waste fluid does not squirt.

When the slit 52 of the biopsy forceps 50 passes through the round hole 27 of the second closing membrane 26, as shown in FIG.
Since 5 is closed, the body waste does not squirt out as in the case of extracting the other treatment tools.

As described above, in the present invention, it is generally assumed that the length from the tip of the biopsy forceps 50 to the rear end of the slit 52 is less than 2.5 times the diameter D of the treatment instrument insertion channel 3. Utilizing this technique, even in the case of a biopsy forceps technique or the like in which the sealing property is poor, it becomes difficult for the body fluid to squirt out, and an endoscopic examination can be performed hygienically.

[0029]

According to the present invention, when the distal end of the treatment tool passes through the first closure membrane disposed inside of the two closure membranes, the second closure membrane on the entrance side is connected to the treatment instrument. The first closure membrane is closed when the distal end of the treatment tool passes through the second closure membrane. And
Since the first and second closing membranes are arranged at a distance of at least 2.5 times the diameter of the treatment instrument insertion channel, a treatment instrument such as a biopsy forceps having a slit or the like formed at the distal end thereof can be used. Even at the time of passing, a reliable seal is performed similarly to the above, and ejection of body waste fluid does not occur.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a forceps stopper of an endoscope according to an embodiment of the present invention.

FIG. 2 is an external view showing an entire configuration of the endoscope according to the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a state where the tubular treatment tool is pulled out from the forceps stopper of the endoscope according to the embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a state in which a biopsy forceps is pulled out from a forceps stopper of the endoscope according to the embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a state in which a biopsy forceps is pulled out from a forceps stopper of the endoscope according to the embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a state in which a biopsy forceps is pulled out from a forceps stopper of a conventional endoscope.

[Explanation of symbols]

 Reference Signs List 3 treatment tool insertion channel 10 forceps plug 14 first closing membrane 15 slit 26 second closing membrane 27 round hole 40 tubular treatment tool 50 biopsy forceps 52 slit

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroyuki Takase 2-36-9 Maenocho, Itabashi-ku, Tokyo Asahi Gaku Kogyo Co., Ltd. F-term (reference) 4C061 AA00 BB00 CC00 DD03 FF43 HH23 JJ06

Claims (2)

[Claims] A first closing membrane, which is normally kept closed by its own elasticity and elastically pushed open by a treatment tool passing therethrough, is provided at an entrance portion of a treatment tool insertion channel of an endoscope. A second closing membrane that is in close contact with and seals the outer surface of the passing treatment instrument, and a diameter of the treatment instrument insertion channel between the two closing membranes with the second closing membrane serving as the inlet side. A forceps stopper for an endoscope, wherein the stopper is disposed at least 2.5 times apart. 2. A negative-shaped slit is formed in the treatment instrument passing portion of the first closing membrane, and a negative slit or a round hole is formed in the treatment instrument passing portion of the second closing membrane. The endoscope forceps stopper according to claim 1.