CN220158206U - Treatment tool for endoscope - Google Patents

Abstract

Provided is a treatment tool for an endoscope, which can be easily detached into a sheath and an operation part having different materials. An endoscope treatment tool comprising a treatment portion and an operation portion for operating the treatment portion, wherein the treatment tool comprises a sheath having the treatment portion at one end and the treatment portion at the other end, and wherein the treatment portion is detachably attached to the operation portion.

Description

Treatment tool for endoscope

Technical Field

The present utility model relates to a treatment tool for an endoscope.

Background

Conventionally, a treatment portion for an endoscope has been widely used, which has a treatment portion at a distal end and is inserted into a body cavity through a channel of an endoscope to treat a lesion by the treatment portion.

For example, patent document 1 discloses an endoscopic treatment tool capable of fixing a sheath to a member to be coupled on the side of an operation portion without using a fixing material or the like.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 11-290333

Disclosure of Invention

Technical problem to be solved by the utility model

In general, a treatment tool for an endoscope such as a biopsy forceps is required to have a sheath with reduced plasticity and manufacturing cost. Therefore, the sheath is made of a metal material, and the operation portion is made of a resin material.

On the other hand, the used endoscopic treatment tool needs to be discarded, but as described above, since the parts of different materials are mixed in the endoscopic treatment tool, it is desirable to classify the parts by the same material and perform discarding treatment suitable for each material. In order to achieve this, for example, it is necessary to make it possible to easily detach the sheath from the resin.

However, the treatment tool for an endoscope of patent document 1 is not discussed with respect to the ease of such detachment, and cannot be realized.

The present utility model has been made in view of such circumstances, and an object thereof is to provide a treatment tool for an endoscope that can be easily detached into a sheath and an operation portion that are made of different materials.

Solution for solving the technical problems

The treatment tool for an endoscope according to the present utility model includes a treatment portion and an operation portion for operating the treatment portion, and includes a sheath having the treatment portion at one end and the operation portion detachably attached to the other end.

In the present utility model, since the sheath having the treatment portion at one end is detachably attached to the operation portion, the treatment tool for an endoscope can be easily detached into the sheath and the operation portion which are made of different materials.

Effects of the utility model

According to the present utility model, it is possible to provide a treatment tool for an endoscope, which can be easily detached into a sheath and an operation portion having different materials.

Drawings

Fig. 1 is an external view of an endoscopic treatment tool according to embodiment 1 of the present utility model.

Fig. 2 is a longitudinal sectional view of the treatment tool for an endoscope taken along line II-II in fig. 1.

Fig. 3 is an enlarged view of the ellipse a of fig. 2 to show it.

Fig. 4 is an enlarged view of the ellipse B of fig. 2 to show it.

Fig. 5 is an explanatory view for explaining engagement of the engaging member and the engaged cylinder of the operation wire.

Fig. 6 is an explanatory view for explaining a method of removing the treatment tool for an endoscope according to embodiment 1.

Fig. 7 is an explanatory view for explaining a state in which the bending prevention tube is engaged with the attachment portion in the endoscope treatment instrument according to embodiment 2.

Description of the reference numerals

10: an operation unit; 11: a guide cylinder; 12: a moving member; 13: a ring portion; 14: an engaging member; 20: a sheath; 21: a treatment unit; 23: a bending prevention tube; 23A: a convex portion; 23B: a protrusion; 24: an operation wire; 100: a treatment tool for an endoscope; 111: a mounting part; 112: a notch; 114: a concave portion; 114A: a clamping groove; 115: a long hole; 115A: a large long hole; 115B: a small long hole; 116: marking; 122: a through hole; 124: a long hole; 131: a circular ring portion; 141: a connecting part; 143: an engagement protrusion; 144: a conical portion.

Detailed Description

The treatment tool for an endoscope according to the embodiment of the present utility model will be described in detail below with reference to the drawings.

(embodiment 1)

Fig. 1 is an external view of an endoscope treatment tool 100 according to embodiment 1 of the present utility model, and fig. 2 is a longitudinal sectional view of the endoscope treatment tool 100 taken along line II-II in fig. 1.

The treatment tool 100 for an endoscope according to embodiment 1 includes a sheath 20 inserted into a body through a channel of an endoscope (not shown) and an operation unit 10 for operating a treatment unit 21 described below of the sheath 20.

The sheath 20 is elongate in shape and has plasticity. The sheath 20 includes a treatment portion 21, an operation wire 24, a wire protection tube 22, and a bending prevention tube 23 (first tube portion). A disposal portion 21 is provided at one end of the sheath 20, and the other end of the sheath 20 is detachably attached to the operation portion 10.

The treatment unit 21 is a so-called cup-shaped forceps made of metal, and grips tissue or the like of an affected area in a body cavity. The treatment unit 21 is connected to one end of the operation wire 24, and is opened and closed by the operation wire 24.

The operation wire 24 is a thin metal wire, and as described above, one end thereof is connected to the treatment portion 21, and the other end thereof is provided with a cylindrical engaged cylinder 25 (see fig. 2) engaged with the engagement member 14 described later. The other end of the wire is inserted into the engaged cylinder 25 and fixed by caulking, welding, or the like. The operation wire 24 can be attached to or detached from the engaging member 14 by adjusting the engagement or release of the engaged cylinder 25 with the engaging member 14.

All parts of the operation wire 24 except the other end are inserted into the wire protecting tube 22, and the opening and closing of the treatment section 21 is operated by advancing and retreating the wire protecting tube 22 in the axial direction.

The wire protecting tube 22 is formed of a flat wire coil and has a metal elongated tubular shape.

The wire protection tube 22 has an inner diameter larger than that of the operation wire 24, and is fitted into a guide tube 11 (second tube portion) of the operation unit 10 (see fig. 2) at the other end portion on the side of the operation unit 10.

The bending prevention pipe 23 is formed of a metal pipe shape and is formed of a round wire coil. The bending prevention pipe 23 is shorter than the wire protection pipe 22, and has an inner diameter larger than the outer diameter of the wire protection pipe 22. A wire protection tube 22 is inserted inside the bending prevention tube 23. A part of the bending prevention pipe 23 is attached to the operation unit 10, and the other part thereof is exposed to the outside. Is disposed on the same axis as the guide cylinder 11 of the operation unit 10. The portion of the bending prevention pipe 23 is hereinafter referred to as the other end portion.

The operation unit 10 is made of resin. Specifically, the operation unit 10 is made of biodegradable materials such as PLA (polylactic acid), cellulose acetate, bio-polypropylene (BPP), bio-PET (polyethylene terephthalate), and bio-PA (polyamide). The operation unit 10 includes a guide tube 11, a moving member 12, a ring 13, and an engagement member 14.

Fig. 3 is an enlarged view of an ellipse a of fig. 2, and fig. 4 is an enlarged view of an ellipse B of fig. 2. The configuration of the operation unit 10 will be described in detail below with reference to fig. 2 to 4.

The guide tube 11 has a substantially cylindrical shape, and has a mounting portion 111 mounted to the other end portion of the sheath 20 at one end portion thereof, and a holding portion 113 holding the ring portion 13 at the other end portion thereof.

The mounting portion 111 has a long hole 115 having a small diameter penetrating the axial center of the operation portion 10. The diameter of the long hole 115 is enlarged at one end side of the guide cylinder 11. The large diameter portion of the long hole 115 is hereinafter referred to as a large long hole 115A, and the small diameter portion of the long hole 115 is referred to as a small long hole 115B.

The small long hole 115B is formed between the large long hole 115A and a cutout 112 described later. That is, the small long hole 115B communicates with the large long hole 115A at one end thereof and communicates with the cutout 112 at the other end thereof.

The long hole 115A is screwed to the other end portion of the bending prevention pipe 23 of the sheath 20.

As described above, the bending prevention pipe 23 is constituted by a round wire coil made of metal, and the other end portion thereof is attached to the operation portion 10. Since the bending prevention pipe 23 is a round wire coil, as shown in fig. 3, the protruding portions 23A (engaging protruding portions) having a thread shape are formed at regular intervals on the outer peripheral surface of the bending prevention pipe 23.

In response, the long hole 115A has a shape corresponding to the outer peripheral surface (the convex portion 23A) of the bending prevention pipe 23. That is, screw groove-shaped concave portions 114 (engaging concave portions) corresponding to the convex portions 23A of the bending prevention pipe 23 are formed at regular intervals in the inner peripheral surface of the mounting portion 111 corresponding to the elongated hole 115A. Thus, the convex portion 23A of the outer peripheral surface of the buckling preventing pipe 23 (the other end portion) functions as a male screw, while the concave portion 114 of the inner peripheral surface of the mounting portion 111 corresponding to the large long hole 115A functions as a female screw, so that the large long hole 115A (the mounting portion 111) is screwed with the buckling preventing pipe 23 (the other end portion).

At least a portion of the mounting portion 111 corresponding to the long hole 115A has light transmittance. For example, the portion may be transparent or translucent, so long as the position of the bending prevention pipe 23 inside the mounting portion 111 can be visually recognized.

In addition, a mark 116 is formed on the outer peripheral surface of the mounting portion 111 at a position corresponding to the boundary position between the large long hole 115A and the small long hole 115B. As described above, when the long hole 115A engages with the bending prevention pipe 23, the bending prevention pipe 23 is at the standard position when the other end of the bending prevention pipe 23 is at the position of the mark 116.

The worker can attach the bending prevention pipe 23 to the attachment portion 111 (guide tube 11) by rotating it forward (clockwise), for example, and can detach the bending prevention pipe 23 from the attachment portion 111 (guide tube 11) by rotating it backward (counterclockwise).

The small long hole 115B has a diameter substantially the same as the outer diameter of the wire protecting tube 22, and the other end portion of the wire protecting tube 22 is inserted into the small long hole 115B. The other end portion of the wire protecting tube 22 is embedded in the small long hole 115B. The small long hole 115B is reduced in diameter at the other end on the side of the cutout 112. Therefore, the wire protection tube 22 is restricted from moving from the other end of the elongated hole 115B to the side of the slit 112, and only the operation wire 24 passes through the other end of the elongated hole 115B and is inserted into the slit 112 (see fig. 2).

In the guide cylinder 11, a notch 112 is formed from a central portion in the axial direction to the vicinity of the other end portion along the axial direction of the guide cylinder 11. The slit 112 is elongated and rectangular in shape when viewed in the radial direction of the guide tube 11 (see fig. 1), and penetrates the guide tube 11 in the radial direction (see fig. 2). In other words, the cutouts 112 are through holes penetrating in the radial direction through the axial center of the guide tube 11, and are open to the opposite outer peripheral surfaces of the guide tube 11.

The moving member 12 is externally fitted to the guide cylinder 11. The moving member 12 has a substantially spool shape, and the guide tube 11 is inserted into the long hole 124 inside thereof. The moving member 12 is fitted together with the guide cylinder 11, and the moving member 12 is movable in the axial direction of the guide cylinder 11. At this time, the movement range of the moving member 12 is limited by the length of the cutout 112 as described later.

In the moving member 12, a pair of disk flange portions 121 are provided to face each other with a predetermined interval therebetween in the axial direction of the guide tube 11. The cylindrical flange portion 123 is provided on the outer side surface of one of the pair of disc flange portions 121, which is close to one end portion of the guide tube 11. That is, the flange 123 is provided with a single turn along the edge of the long hole 124, and protrudes outward in the axial direction of the guide tube 11 from the outer surface of the one disk flange 121 (see fig. 2 and 4).

Two through holes 122 (concave portions) penetrating the flange 123 in the radial direction are formed in the flange 123. Each through hole 122 is rectangular in shape when viewed in the radial direction of the flange portion 123, and is formed at a position opposed to each other in the radial direction of the flange portion 123.

As described above, the holding portion 113 (see fig. 2) that holds the ring portion 13 is provided at the other end portion of the guide tube 11. The holding portion 113 is a reduced diameter portion formed at the other end portion of the guide tube 11. In the holding portion 113, an end portion on the side of the ring portion 13 is separated by a dividing groove passing through the axial center, and a fade prevention portion for preventing fade of the ring portion 13 is formed at the tip end.

The ring portion 13 includes a ring portion 131 for catching the thumb of the operator and a shaft portion 132 protruding radially outward from the outer peripheral surface of the ring portion 131. The shaft 132 is substantially cylindrical (see fig. 2), and is externally fitted to the holding portion 113 of the guide tube 11. The shaft 132 is fitted in the holding portion 113 and rotatable about the holding portion 113. In other words, the annular portion 131 is rotatable about the radial direction, that is, the axial direction of the guide tube 11.

An engaging member 14 is disposed inside the notch 112 of the guide tube 11. As described above, the engaging member 14 engages with the engaged cylinder 25 of the operation wire 24. The engaging member 14 is a flat member having a U-shape, and is set so that an opening portion faces the mounting portion 111 of the guide tube 11.

The engaging member 14 has a pair of coupling portions 141. Each of the coupling portions 141 has a substantially rectangular plate shape extending in the axial direction of the guide tube 11. The pair of coupling portions 141 are arranged to face each other at a predetermined interval in the radial direction of the guide cylinder 11 and are parallel to the axial direction of the guide cylinder 11. Each of the coupling portions 141 is provided with a hooking portion 142 protruding inward at a middle portion in the longitudinal direction. Each of the coupling portions 141 has a width that is narrowed from the hooking portion 142 toward the front end, and an engagement projection 143 (engagement end portion) that projects outward, i.e., in a direction opposite to the projecting direction of the hooking portion 142 is provided at the front end. The engagement projection 143 protrudes from the cutout 112 to the outside of the guide cylinder 11.

As shown in fig. 4, in the engaging protrusion 143, a tapered portion 144 is formed at a portion on the base side of the coupling portion 141. The tapered portion 144 has a width that widens in the radial direction of the guide cylinder 11 as it approaches the front end, i.e., as it approaches one end of the guide cylinder 11.

Fig. 5 is an explanatory view for explaining engagement of the engaging member 14 with the engaged cylinder 25 of the operation wire 24. The engaged cylinder 25 is engaged with the engaging member 14 at the base portions of the pair of coupling portions 141.

In the engaging member 14, the distance between the coupling portions 141 is substantially equal to the diameter of the engaged cylinder 25, and the dimension from the root of each coupling portion 141 to the hooking portion 142 is substantially equal to the length of the engaged cylinder 25. Therefore, when the engaged cylinder 25 is positioned between the pair of coupling portions 141 at the base portions of the pair of coupling portions 141, the edge of the engaged cylinder 25 is caught by the catching portion 142 of each coupling portion 141, and the engaged cylinder 25 is engaged with the engaging member 14. At this time, the operation wire 24 passes between the hooking portions 142.

As described above, the pair of coupling portions 141 are parallel, and the dimension between the outer edges of the pair of coupling portions 141 is substantially equal to the diameter of the guide tube 11 (see fig. 4). Therefore, the engaging projection 143 of each coupling portion 141 protrudes further outside the guide tube 11 than the notch 112. The engagement projections 143 protruding outward are engaged with the through holes 122 of the corresponding moving member 12. Thus, the engaging member 14 is coupled to the moving member 12, and the engaging member 14 advances and retreats in the notch 112 in conjunction with the movement of the moving member 12.

That is, as described above, the engaging member 14 advances and retreats along the slit 112 in the axial direction of the guide tube 11 in a state of being engaged with the other end portion (engaged tube 25) of the operation wire 24. As described above, the engaging member 14 is coupled to the moving member 12 by the coupling portion 141, and moves within the range of the notch 112 in accordance with the movement of the moving member 12. At this time, the operation wire 24 is advanced and retracted together to control the opening and closing of the treatment unit 21. Since the movement of the engaging member 14 is restricted within the cutout 112, the range of movement of the moving member 12 is also restricted by the length of the cutout 112.

The endoscope treatment tool 100 according to embodiment 1 can be easily detached into a metal part and a resin part when discarded. The following is a detailed description.

Fig. 6 is an explanatory view for explaining a method of removing the endoscope treatment tool 100 according to embodiment 1. For convenience, the wire protecting tube 22 and the operation wire 24 are omitted from fig. 6. In fig. 6, the moving member 12 is partially omitted from illustration, and the moving member 12 is shown by a solid line, a one-dot chain line, and a two-dot chain line according to the position.

First, the operator moves the moving member 12 to one end side (the mounting portion 111 side) of the guide tube 11. At this time, the engaging member 14 moves together in the cutout 112. However, since the notch 112 is not formed in the mounting portion 111, movement of the engaging member 14 is restricted at the boundary between the mounting portion 111 and the notch 112. With this, the movement of the moving member 12 is also restricted (see the moving member 12 in solid line in fig. 6).

As described above, when the movement of the movable member 12 is restricted, the operator pushes the movable member 12 toward one end side of the guide tube 11 with a stronger force (see a black arrow in fig. 6). At this time, the edges of the through holes 122 of the moving member 12 are respectively abutted against the tapered portions 144 of the engaging projections 143 of the engaging member 14 (see the moving member 12 of the one-dot chain line in fig. 6), and the force pressing down the engaging projections 143 inward (see the arrow of the broken line in fig. 6) acts. Therefore, the distal end portion (engagement projection 143) of each coupling portion 141 made of resin is bent inward as shown by a broken line in fig. 6. When the operator continues to push the moving member 12, the engagement between the through hole 122 of the moving member 12 and the engagement projection 143 of the engaging member 14 is released (see the moving member 12 shown by the two-dot chain line in fig. 6), and the moving member 12 can be removed from the guide tube 11.

Next, the engaging member 14 is pushed out from the notch 112. At this time, the engaged member 14 is engaged with the engaged tube 25 of the operation wire 24, so that the engaged tube 25 is pushed in the thickness direction of the engaging member 14 to release the engagement by expanding the interval between the coupling portions 141. Then, the worker rotates the bending prevention pipe 23 counterclockwise to detach it from the mounting portion 111 (guide tube 11).

The endoscope treatment tool 100 according to embodiment 1 can be separated into a metal part and a resin part by the above simple operation. The following steps are performed for discarding the metal parts and the resin parts.

In the treatment tool 100 for an endoscope according to embodiment 1, since the operation unit 10 is made of biodegradable resin as described above, it can be decomposed by microorganisms, and since incineration is not required, carbon dioxide emission due to incineration can be suppressed.

In the endoscope treatment tool 100 according to embodiment 1, since at least the portion corresponding to the long hole 115A has light transmittance as described above, the engagement between the attachment portion 111 (long hole 115A) and the bending prevention tube 23 can be confirmed.

In the endoscope treatment tool 100 according to embodiment 1, since the mark 116 is formed at the boundary position between the large long hole 115A and the small long hole 115B as described above, it is possible to confirm whether or not the bending prevention tube 23 is in the standard position when the large long hole 115A is engaged with the bending prevention tube 23.

In the endoscope treatment tool 100 according to embodiment 1, as described above, the ring portion 13 (the annular portion 131) is rotatable about the radial direction, that is, the axial direction of the guide tube 11. Therefore, the operability of the operation unit 10 can be improved.

(embodiment 2)

In embodiment 1, the case where the bending prevention pipe 23 of the sheath 20 is screwed to the mounting portion 111 of the guide tube 11 to mount the bending prevention pipe 23 to the mounting portion 111 is described as an example, but the present utility model is not limited thereto.

Fig. 7 is an explanatory view for explaining an engagement state between the bending prevention tube 23 and the mounting portion 111 in the endoscope processing tool 100 according to embodiment 2.

In the endoscope treatment tool 100 according to embodiment 2, the bending prevention tube 23 is formed of a flat wire coil made of metal, and the other end portion thereof is attached to the operation unit 10. Since the bending prevention pipe 23 is a flat wire coil, the outer peripheral surface of the bending prevention pipe 23 is flat, and a projection 23B (engagement convex portion) is provided on the outer peripheral surface of the other end of the bending prevention pipe 23.

In response, an engagement groove 114A (engagement recess) for passing the protrusion 23B of the bending prevention pipe 23 is formed in the inner peripheral surface of the mounting portion 111 corresponding to the long hole 115A. The engagement groove 114A has a substantially L-shape. That is, the engagement groove 114A extends from the front end of the mounting portion 111 toward the other end in the axial direction, and is bent in the circumferential direction at the end on the other end side.

When the bending prevention pipe 23 is attached to the attachment portion 111, the worker inserts the other end portion of the bending prevention pipe 23 into the long hole 115A of the attachment portion 111 so that the projection 23B is positioned in the engagement groove 114A, and rotates the bending prevention pipe 23 counterclockwise in the circumferential direction of the attachment portion 111 when the projection 23B reaches the mark 116 (see the arrow of the solid line in fig. 7). Thereby, the protrusion 23B engages with the engagement groove 114A, and the bending prevention pipe 23 is attached to the attachment portion 111.

When the bending prevention pipe 23 is removed from the mounting portion 111, the engagement between the projection 23B and the engagement groove 114A is released by performing operations in a reverse order to the above-described order.

The technical features (constituent elements) described in embodiments 1 to 2 can be combined with each other, and new technical features can be formed by the combination.

The embodiments disclosed herein are illustrative in all respects, and not restrictive. The scope of the present utility model includes not only the above-described meaning but also all modifications within the meaning and scope equivalent to the claims, which are shown by the claims.

Claims (9)

1. A treatment tool for an endoscope is characterized by comprising a treatment part and an operation part for operating the treatment part,

the treatment tool for an endoscope includes a sheath having the treatment portion at one end and the other end detachably attached to the operation portion.

2. The endoscopic treatment device according to claim 1, wherein,

the sheath has a first tube portion through which a wire rod of the treatment portion is guided, the first tube portion having an engagement projection on an outer peripheral surface,

the operation portion has a second tube portion having an engagement concave portion on an inner peripheral surface of one end portion, the engagement concave portion being engaged with the engagement convex portion.

3. The endoscopic treatment device according to claim 2, wherein,

the operation unit includes:

a moving member having a long hole into which the second tube portion is inserted, and moving along an axial length direction of the second tube portion; and

an engaging member engaged with an end portion of the wire rod and moving in the axial direction inside the second cylinder, the engaging member being connected to the moving member by a connecting portion extending from a cutout formed in the second cylinder in the axial direction,

the connecting portion has an engagement end portion engaged with a recess provided in the moving member, and a tapered portion is formed at the engagement end portion.

4. The endoscopic treatment device according to claim 2, wherein,

the clamping convex part is in a thread shape, the clamping concave part is in a thread groove shape corresponding to the thread shape,

the engagement convex portion is in threaded connection with the engagement concave portion.

5. The endoscopic treatment device according to claim 2, wherein,

the first cylinder portion is a coil.

6. The endoscopic treatment device according to claim 1, wherein,

the operation portion is made of a biodegradable material.

7. The endoscopic treatment device according to claim 2, wherein,

the one end portion of the second tube portion has light transmittance.

8. The endoscopic treatment device according to claim 2, wherein,

the one end of the second cylinder has a mark indicating a standard position of the first cylinder.

9. The endoscopic treatment device according to claim 3, wherein,

the slit penetrates the second cylinder portion in a radial direction,

the engaging member has two connecting portions extending from the cutouts to opposite sides,

the moving member is in the shape of a spool and has two concave portions corresponding to the engaging end portions of the coupling portions,

a circular ring portion rotatable about a radial direction is provided at the other end of the second cylinder portion.