JP3441640B2 - Endoscope treatment tool connection mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for connecting a sheath and an operating portion of a treatment instrument for an endoscope which is used by being inserted into and removed from a treatment instrument insertion channel of an endoscope.

[0002]

2. Description of the Related Art Generally, a treatment tool for an endoscope is constructed by connecting an operating portion to the proximal side of a sheath which is inserted into and removed from a treatment tool insertion channel of an endoscope, and is used for cleaning and disinfection after use. In order to efficiently replace the sheath or the sheath side when it is damaged,
It is desirable to be able to separate the sheath and the operating part. However, the connection mechanism should be as low-cost as possible.

[0003] Therefore, conventionally, for example, the actual public Sho 60-316.
As described in No. 84, if the plastic member of the connecting portion is divided by the groove and the divided piece is elastically deformed and tightened with a tightening ring, the sheath and the operating portion are connected,
It was designed so that it could be separated if the tightening ring was loosened.

[0004]

However, in recent years, an increasing number of facilities use an autoclave (high-pressure steam sterilizer) in order to perform complete disinfection after use, and the sterilization is performed with the sheath and the operating section connected. There are many cases where it is done.

Then, the elastically deformed plastic member is permanently deformed to its original shape by the environment of high temperature and high pressure by the autoclave, and then the sheath and the operating portion cannot be separated. Moreover, the same thing occurs when the sheath and the operating portion are left connected for a long period of time.

Therefore, according to the present invention, the sheath and the operating portion are separable, and the members are not deformed even if the sheath and the operating portion are left connected for a long period of time or sterilized by an autoclave. An object of the present invention is to provide a connecting mechanism for a treatment tool.

[0007]

In order to achieve the above object, a connecting mechanism for an endoscopic treatment tool according to the present invention includes a sheath connecting member having a distal end portion to which a sheath is connected and a portion near a proximal end of the sheath connecting member. A retaining ring formed in a cross-sectional shape having a corner protruding toward one side and having a square hole through which the corner of the sheath connecting member passes is rotatably provided at a predetermined angle around the axis of the square hole. A fitting hole is formed at the distal end portion of the operation portion while being attached to the distal end portion, and a corner portion of the sheath connecting member that has passed through the square hole is fitted in a state where the sheath connecting member does not rotate. By rotating the pressing ring in a state of being fitted into the fitting hole by passing through, the angular hole is oriented so as not to pass through the corner portion of the sheath connecting member, and the sheath connecting member of the operating portion main body is moved. From the tip Characterized in that a state which is not removed.

It should be noted that the tip portion of the operation portion main body is divided into a plurality of pieces by slits, and the annular portion of the pressing ring is fitted on the outer periphery of the portion, and the positions interfere with each other when the pressing ring is rotated. On the outer surface of the pressing ring and on the inner surface of the split piece, when the pressing ring is rotated, the split pieces are elastically deformed by the interference of the projections, and the projections interfere with each other. The divided pieces may not be elastically deformed after passing the position.

Further, the corner portion of the sheath connecting member, the square hole of the pressing ring, and the fitting hole of the operating portion may all be formed in a rectangular sectional shape.

[0010]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 3 is a plan view of the operating portion 10 of the endoscopic treatment tool, and FIG. 4 is a side view thereof. The present invention is applied to a high-frequency snare, a basket-type grasping tool, forceps and other various endoscopic treatment tools. be able to.

A fixed finger hook 12 for engaging the operator's thumb is formed at the proximal end of the operating portion main body 11 formed of a slender plastic material, and the fixing finger rest 12 is formed in the longitudinal direction with respect to the operating portion main body 11. A movable finger hook 14 for engaging the index finger and the middle finger is formed on a plastic slide member 13 slidably attached to the.

A proximal end of the sheath 1 which is inserted into and removed from a treatment instrument insertion channel of an endoscope (not shown) is connected to a distal end portion of the operation portion main body 11 through a metal sheath connecting member 15. There is.

The sheath 1 is a flexible tube made of, for example, tetrafluoroethylene resin. However, the sheath connecting member 1
5 may be formed of a plastic material or the like, and the sheath 1 may be formed of a metal coil pipe or the like.

Reference numeral 2 is a bend preventing tube for preventing the sheath 1 from being bent sharply and broken, and its proximal end portion is attached to the sheath connecting member 15. Reference numeral 16 is a plastic holding ring provided to prevent the sheath connecting member 15 from coming off from the distal end portion of the operation portion main body 11.

The pressing ring 16 rotates the sheath connecting member 15 by 45 ° around the axis to move the sheath connecting member 15 into the operating portion main body 11.
Switch between removable and non-removable state. The operation unit main body 11 is used as a mark of the rotation state.
Indicators 19 and 20 are provided on the press ring 16 and the press ring 16, respectively.

An elongated groove 17 is formed along the longitudinal direction of the operating portion main body 11, and the proximal end of the operating wire 3 which is inserted into the sheath 1 so as to advance and retreat in the axial direction is inside the groove 17. Is connected to the slide member 13.

However, in the groove 17, the operating wire 3
A metal pipe 4 for preventing buckling is integrally coated on the. Reference numeral 18 is a high-frequency power cord connection terminal provided on the slide member 13 so that a high-frequency current can be passed through the operation wire 3. The metal pipe 4 may be replaced with a plastic tube having electrical insulation.

FIG. 5 is a sectional view from the connecting portion between the sheath 1 and the operating portion 10 to the slide member 13 portion. The screw portion 18b formed at the root of the contact rod 18a of the connection terminal 18 is screwed into the connecting block 21 made of a conductive metal arranged in the groove 17 of the operation portion main body 11, and the connecting block 21 slides. It is fixed to the member 13.

The tip of the screw portion 18b is connected to the operation wire 3
The base end of the metal pipe 4 is pressed and fixed to the connecting block 21, and the operation wire 3 is integrated with the metal pipe 4 by loosening the screwed portion 18b.
It can be detached from 1.

However, the metal pipe 4 is formed with a constricted portion 4a at the portion where the tip of the screw portion 18b abuts,
Even if the screw portion 18b is slightly loosened, the metal pipe 4 is prevented from unintentionally coming off the connecting block 21.

The contact rod 18a projects from the slide member 13 and is surrounded by a plastic receiving tube 1a.
8c is screwed and fixed so that a connector of a high frequency power cord (not shown) can be connected.

As shown in FIG. 6, the sheath connecting member 15 has an intermediate portion 15a formed in a cylindrical shape.
On the tip side thereof, a bend preventing tube connecting portion 15b for press-fitting and connecting the base end of the bend preventing tube 2 and the sheath 1 are provided.
And a sheath connecting portion 15c for press-fitting and connecting the base ends of the two are formed in order with a small outer diameter. Sheath connecting part 15
The outer peripheral surface of c is formed in a convex-concave shape that is sharp in the direction of cutting into the sheath 1 when the sheath 1 is pulled in the pull-out direction.

A portion of the sheath connecting member 15 closer to the base end than the intermediate portion 15a is formed in a rectangular cross section whose outer surface has a substantially square shape, and four corners thereof are the intermediate portion 15a.
Projects outward from the outer surface of.

At the axial position of the sheath connecting member 15, a hole for passing the operation wire 3 and the metal pipe 4 covered therethrough is formed so as to penetrate therethrough, and the base end side opening 15 of the hole is formed.
The e is formed in a large diameter and is formed in a taper shape which gradually becomes thinner toward the back.

Since the tapered shape is formed at the angle of so-called injection taper, after the clinical use, the inside of the sheath 1 can be easily cleaned by connecting the injection cylinder filled with the cleaning solution.

The outer surface of the operation unit main body 11 near the tip is formed in a circular cross-sectional shape. As shown in FIG. 7, a rectangular cross-section fitting hole into which the rectangular cross-section 15d of the sheath connecting member 15 is fitted. 24 is formed from the front end surface side.

The front end portion of the operation portion main body 11 is divided into four divided pieces 11a by the four slits 25 formed in the diagonal direction. The slit 25 is
It is formed from the tip of the operation section main body 11 in a direction parallel to the axial direction of the operation section main body 11 to a position near the bottom of the fitting hole 24, and each divided piece 11a is formed into a leaf spring shape in a direction orthogonal to the axis. Can be elastically deformed.

The outer surface of the tip portion of the operation portion main body 11 is formed thick like a mushroom head. The outer surface of the large-diameter portion 26 is formed in a taper shape that gradually becomes thinner toward the front side, and an outward projection 27 for clicking is provided at one place of the taper surface.

The outward protrusion 27 is formed in a rounded shape. Further, a rounded stopper projection 28 for restricting the rotation of the pressing ring 16 is provided on the outer peripheral surface slightly rearward of the tip end.

As shown in FIG. 5, the pressing ring 16 is attached so as to surround the tip portion of the operation portion main body 11.
The pressing ring 16 is formed in a cylindrical cap shape that loosely contacts the outer surface of the divided piece 11a portion of the operation portion main body 11,
The portion of the distal end of the operation portion main body 11 into which the large diameter portion 26 is inserted is hollowed out to have a large diameter.

To attach the holding ring 16 to the operating portion main body 11, the tip of the operating portion main body 11 may be inserted into the holding ring 16, but when the large diameter portion 26 of the operating portion main body 11 passes through the inside of the holding ring 16. In addition, the divided piece 11a portion of the operation portion main body 11 divided by the slit 25 elastically deforms inward, and when the large-diameter portion 26 reaches the inside of the gouging portion 31, it returns to the original non-elastically deformed state.

Then, as shown in FIG. 5, the pressing ring 16 fitted to the distal end portion of the operation portion main body 11 is
The large-diameter portion 26 of the operation portion main body 11 prevents movement in the pull-out direction, and allows movement only in the rotation direction.

However, as shown in FIG. 2 showing the II-II cross section, a fan-shaped space 32 is formed on the inner surface of the pressing ring 16 so that the stopper projection 28 on the side of the operation portion main body 11 can move only inside thereof. However, the rotation angle of the pressing ring 16 about the axis is regulated to, for example, 45 °.

Further, even within the 45 ° range, the retaining ring 16
Must not rotate by itself, so as shown in FIG. 1 showing the I-I cross section, the inward projection 34 that cooperates with the outward projection 27 formed at the tip of the operation portion main body 11 as a click. Is formed on the pressing ring 16 side. The operation wire 3 and the metal pipe 4 are not shown in FIG. 1.

Further, as shown in FIG. 8, a square hole 33 is formed at the axial position of the tip surface of the pressing ring 16. The square hole 33 is formed in a rectangular shape slightly larger than the rectangular cross section 15d of the sheath connecting member 15, and the opposite side dimension is larger than the outer diameter of the intermediate portion 15a of the sheath connecting member 15.

Therefore, as shown in FIG. 1 (A), the rectangular cross-section 15d of the sheath connecting member 15 is in a state in which the directions of the square hole 33 of the press ring 16 and the fitting hole 24 of the operating portion main body 11 are aligned. From the square hole 33 to the fitting hole 24
It can be fitted in or pulled out from the fitting hole 24 through the square hole 33.

Then, as shown in FIG. 1B, when the pressing ring 16 is rotated by 45 °, the square hole 33 of the pressing ring 16 passes through the square hole 33 and is fitted into the fitting hole 24. The rectangular cross section 15d is oriented so as not to pass through, and the sheath 1 is connected to the operation unit 10.

In this way, the sheath 1 can be arbitrarily connected / disconnected to / from the operating portion 10. However, when the pressing ring 16 is rotated, the sheath 1 and the inner surface of the outward projection 27 are rotated at positions other than both ends of the movement range. The orientation protrusion 34 interferes with the orientation protrusion 34.

That is, when the pressing ring 16 is rotated, the outward protrusion 27 is pushed by the inward protrusion 34, and the outward protrusion 27 is pushed.
The inward projection 34 is outwardly deformed while elastically deforming the divided piece 11a of the operation portion main body 11 in which the projection is formed.
After reaching the end of the range of movement, all members return to the original state in which they are not deformed.

Therefore, it is necessary to apply a certain amount of force or more to rotate the pressing ring 16 from both end positions of the rotation range, and the pressing ring 16 is stably stationary at both end positions. Since both the outward projection 27 and the inward projection 34 are arcuate projections, the pressing ring 16 does not stand at a position where both the projections 27 and 34 are in contact with each other except at both end positions.

As shown in FIG. 1 (B), when the sheath connecting member 15 is connected to the operation portion main body 11 so as not to slip out, all members receive force from other members. It is not elastically deformed.

Therefore, even if the sheath 1 is left in a state of being connected to the operating portion 10 for a long period of time or sterilized by an autoclave, the member is not deformed by it, and good operability can be maintained. it can.

[0043]

According to the present invention, by rotating the pressing ring in a state where the corner portion of the sheath connecting member is fitted in the fitting hole of the operation portion main body, the square hole formed in the holding ring is changed to the sheath connecting member. It is oriented so that it does not pass through the corners of
Since it is possible to prevent the sheath connecting member from separating from the distal end of the operation section body without receiving a force from any of the other members, it is possible to leave the sheath and the operation section connected for a long period of time. Even if the sterilization is carried out by an autoclave, the member is not deformed, and the sheath and the operating portion can be optionally separated when necessary.

[Brief description of drawings]

1 is a cross-sectional view taken along the line I-I in FIG. 5 of the embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG. 5 of the embodiment of the present invention.

FIG. 3 is a plan view of an operation portion of the treatment tool according to the embodiment of the present invention.

FIG. 4 is a side view of an operating portion of the treatment tool according to the embodiment of the present invention.

FIG. 5 is a partial side cross-sectional view of the operating portion of the treatment tool according to the embodiment of the present invention.

FIG. 6 is a perspective view of a sheath connecting member of the treatment tool according to the embodiment of the present invention.

FIG. 7 is a perspective view of a distal end portion of the operation portion main body of the treatment instrument according to the embodiment of the present invention.

FIG. 8 is a perspective view of a holding ring of the treatment tool according to the embodiment of the present invention.

[Explanation of symbols]

1 sheath 10 Operation part 11 Operation unit body 11a divided piece 15 Sheath connection member 15d rectangular section 16 retaining ring 24 Fitting hole 25 slits 33 Square hole

─────────────────────────────────────────────────── ───Continued from the front page (56) References JP-A-11-155870 (JP, A) JP-A-7-95982 (JP, A) JP-A-9-534 (JP, A) Actual development 62- 48303 (JP, U) Actual development 5-5106 (JP, U) Actual development 58-152913 (JP, U) Actual development 5-21913 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) A61B 1/00-1/32 A61B 17/28 A61B 17/32

Claims (3)

(57) [Claims] 1. A rectangular hole through which a corner portion of the sheath connecting member passes by forming a portion near the base end of a sheath connecting member having a sheath connected to a distal end portion in a sectional shape having an outwardly protruding corner portion. At the tip of the operation part body,
Together with Fit the rotatably by a predetermined angle around the fitting hole corners of the sheath connecting member passing through the rectangular holes are fitted in a state that does not rotate is formed on the tip portion of the operation portion main body, the By rotating the pressing ring in a state where the corner portion of the sheath connecting member passes through the square hole and is fitted into the fitting hole, the square hole is oriented so as not to pass through the corner portion of the sheath connecting member. , The sheath connecting member and the
A connecting mechanism for an endoscopic treatment tool, characterized in that the sheath connecting member is in a state in which the sheath connecting member is not separated from the distal end of the operating portion main body without relatively rotating the operating portion main body. 2. A position in which a tip portion of the operation portion main body is divided into a plurality of pieces by a slit, and an annular portion of the pressing ring is fitted on an outer circumference of the portion so that the pressing ring interferes with each other when the pressing ring is rotated. On the outer surface of the pressing ring and on the inner surface of the split piece, when the pressing ring is rotated, the split pieces are elastically deformed by the interference of the projections, and the projections interfere with each other. The coupling mechanism for an endoscopic treatment tool according to claim 1, wherein the split piece returns to a state where it is not elastically deformed after passing through the position. 3. The endoscope according to claim 1, wherein each of the corner portion of the sheath connecting member, the square hole of the pressing ring, and the fitting hole of the operation portion is formed in a rectangular cross-sectional shape. Mechanism for connecting treatment tools.