JPH119608A - Treatment tool for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily fetch a calculus in a basket by securing the opening width of a basket even within a narrow spatium. SOLUTION: Relating to a treatment tool for an endoscope provided with a basket 4 consisting of plural elastic wires 5 at the tip of an operation wire inserted to a sheath, the ratio (W/L) of an opening width W at the time of opening the basket 4 to the maximum and a length L in an axial direction at the time is made 0.5 to 0.9. The maximum opening width W of the basket 4 is not separated from the tip of the sheath 2 to sufficiently secure an opening width even within a narrow spatium to surely fetch a calculus into the basket 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment tool for an endoscope which grasps / crushes a calculus generated in a body cavity, for example.

[0002]

2. Description of the Related Art Conventionally, basket forceps for an endoscope for grasping foreign matters such as calculi generated in a body cavity such as a biliary tract or a bladder are known. As shown in, for example, Japanese Utility Model Publication No. Sho 61-9601, a general endoscope basket forceps forms a basket that is elastically spread by a plurality of elastic wires provided with a plurality of bending points. Also,
In the device proposed in Japanese Utility Model Publication No. 5-46426, when the elastic wire forming the basket protrudes from the distal end of the sheath, it has a bent shape that spreads into a substantially octagonal shape as a whole. Further, in the basket forceps proposed in Japanese Patent Application Laid-Open No. 8-299349, at least half of the bending points are located forward of the axial center of the basket.

[0003]

However, Japanese Utility Model Publication No. 61-9601 and Japanese Utility Model Publication No. 5-46426 disclose,
In a conventional endoscope basket forceps as disclosed in JP-A-8-299349, the shape of the basket portion is long in the axial direction, so that the position at the maximum opening width is a position distant from the distal end of the sheath. . Therefore, it is difficult to secure the opening width by the elastic restoring force of the elastic wire, and it is difficult to sufficiently secure the opening width of the basket particularly in a narrow lumen. Also, in a lumen where the front is blocked, the tip of the basket collides with a narrow wall,
It was difficult to capture the stone just before it.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object thereof is to ensure an opening width of a basket even in a narrow lumen so that calculus can be easily taken into the basket. An object of the present invention is to provide a mirror treatment tool.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a treatment for an endoscope in which a basket made up of a plurality of elastic wires is provided at the distal end of an operation wire inserted into a sheath. The ratio (W / L) of the opening width W when the basket was opened to the maximum and the axial length L at that time was 0.5 to 0.9. According to such a configuration, the position of the maximum opening width of the basket does not separate from the distal end of the sheath, the opening width can be sufficiently secured even in a narrow lumen, and the calculus can be reliably taken into the basket. W / L>
When it is 0.9, the opening width W is close to the length L, and the opening width and the length are reversed, so that not only the trapping space of the calculus is reduced, but also the elastic wire which is bent and rises from the operation wire. Becomes large, and the amount of operating force at the time of pulling in the basket increases. Also, W /
When L <0.5, the opening width W becomes too small, and there is no space for capturing calculus.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) A basket-type grasping forceps according to a first embodiment of the present invention will be described with reference to FIG. The basket-type grasping forceps 1 has a sheath 2 formed of a flexible tube material, and an operation wire 3 is slidably inserted into the sheath 2. A proximal operation unit (not shown) is provided on the proximal end side of the sheath 2 to push and pull the operation wire 3 to advance and retract.

A gripping basket 4 is attached to the tip of the operation wire 3. The basket 4 includes a plurality of elastic wires 5, and the distal ends of the elastic wires 5 are bound by a tip 6. The proximal end of each elastic wire 5 is bound by a binding member 7 and connected to the distal end of the operation wire 3. In addition, the base end side of each elastic wire 5 constituting the basket 4 may be extended and bundled to form the operation wire 3.

Near the distal end of each elastic wire 5 in the basket 4, a plurality of bending points 7a to 7c are provided at certain intervals from the distal tip 6 toward the proximal end. By forming these bending points 7a to 7c, each elastic wire 5 constitutes a basket 4 that elastically opens in a basket shape. The basket 4 advances and retreats the operation wire 3 with respect to the sheath 2 by the above-mentioned operation section. Then, when the basket 4 protrudes from the tip of the sheath 2,
The basket 4 is resiliently opened and the basket 4 contracts in response to being pulled into the sheath 2.

Assuming that the axial length of the basket 4 is L and the maximum opening width is W, the ratio of the maximum opening width W when the basket 4 is opened to the maximum and the axial length L at that time ( W
/ L) is 0.5 or more. For example, L = 46m
If m and W = 26 mm, the ratio (W / L) between the maximum opening width W and the axial length L is 0.57, which is a value of 0.5 or more.

When using the basket-type grasping forceps 1, the sheath 2 is inserted into a body cavity, for example, a bile duct, through an insertion channel of an endoscope. When the operation wire 3 is pushed forward by the operation of the hand operation unit and the basket 4 is largely protruded from the distal end of the sheath 2, the basket 4 expands in a large cage shape as shown in FIG. Then, the calculus is taken into the bulge and the operation wire 3 is pulled to wrap the calculus in the basket 4 and capture the calculus, pull it out of the body together with the endoscope, and collect the calculus.

Here, since the ratio (W / L) of the maximum opening width W to the axial length L of the basket 4 is 0.5 or more, the portion of the basket 4 having the maximum opening width W is a sheath. 2, the opening width by the elastic restoring force of the elastic wire 5 can be firmly secured. Further, since the portion having the maximum opening width W of the basket 4 can be formed without separating from the distal end of the sheath 2 and the distal end of the basket 4, it is possible to easily and surely take in the calculus even in a narrow body cavity where the front is closed. It becomes possible.

(Second Embodiment) A basket-type lithotripter 10 according to a second embodiment of the present invention will be described with reference to FIG. The basket-type lithotripter 10 is provided with a basket 4 via a binding member 12 at the tip of an operation wire (not shown) inserted into a flexible sheath 11 made of a close-wound coil made of metal. In the basket 4, the base ends of a plurality of elastic wires 5 are bound by the binding member 12 and connected to the distal end of the operation wire, and the distal ends of the elastic wires 5 are bound by the distal tip 6. At the distal end of the sheath 11, a cylindrical distal tip member 13 having a plurality of crushed teeth formed on the distal end surface is attached.

Each of the elastic wires 5 of the basket 4 has a plurality of bending points 5 a to 5 b from the tip 6 toward the binding member 12.
5e is provided. When the opening width when the basket 4 is opened to the maximum is W and the length in the axial direction at that time is L, the ratio of the maximum opening width W to the axial length L (W
/ L) is 0.5 or more and 0.9 or less. For example, L =
Assuming that 45 mm and W = 40 mm, the ratio (W / L) between the maximum opening width W and the axial length L is 0.89, which is a range of 0.5 or more and 0.9 or less. Value.

When using the basket-type lithotripter 10, the sheath 11 is inserted into the body cavity and the basket 4 is protruded from the distal end of the sheath 11 to expand as in the first embodiment. Then, after the calculus is taken into the inflated basket 4, the operation wire is pulled to pull the basket 4 into the sheath 11, and the calculus is pressed against the crushing teeth of the tip member 13 while tightening the calculus. Can be crushed. In this embodiment, similarly to the first embodiment, the opening width of the elastic wire 5 by the elastic restoring force can be firmly secured, and the calculus can be reliably captured even in the body cavity where the front is closed. Become.

(Third Embodiment) An endoscopic treatment tool according to a third embodiment of the present invention will be described with reference to FIG. In the treatment tool for an endoscope according to the third embodiment, the basket 4 of the basket-type grasping forceps 1 of the above-described first embodiment and the basket-type lithotripter 10 of the second embodiment includes four elastic wires 5. The relationship between the maximum opening width W and the length I of the interval between the elastic wires 5 is given by

[0016]

(Equation 1) It has become. Thereby, the adjacent elastic wires 5
Since it does not approach α = 60 ° or less, the shape of the basket 4 does not significantly collapse. In other words, it is possible to prevent the interval between the elastic wires 5 from becoming too small, maintain the shape of the basket 4, and prevent the shape of the basket 4 from collapsing.

(Fourth Embodiment) A basket-type lithotripter according to a fourth embodiment of the present invention will be described with reference to FIG. In the basket-type lithotripter according to the fourth embodiment, the basket 4 is composed of four elastic wires 5, the maximum opening width W of which is 30 mm or more, specifically 30 to 42 mm. The length I of the interval is 30 mm or less, specifically, 21 to 30 mm. As a result, a huge calculus having a size of 30 mm or more can be easily taken into the basket 4, and the taken calculus is not easily removed. Others are the same as those of the basket type lithotripter 10 in the second embodiment described above.

(Fifth Embodiment) A basket-type lithotripter according to a fifth embodiment of the present invention will be described with reference to FIG. In this embodiment, the basket 4 of the basket-type lithotripter is composed of five elastic wires 5, the maximum opening width W of which is 30 mm or more, specifically 30 to 51 mm, and the length of the interval between the elastic wires 5. The length I is 30 mm or less, specifically, 17 to 30 mm. Thereby, the same function and effect as those of the fourth embodiment can be obtained, but the maximum opening width W is increased.
It is easy to select one having a small interval length I. Others are the basket-type lithotripter 10 in the second embodiment described above.
Is the same as

(Sixth Embodiment) A basket-type lithotripter according to a fifth embodiment of the present invention will be described with reference to FIG. The basket 4 of the basket-type lithotripter in this embodiment is composed of six elastic wires 5, the maximum opening width W of which is 30 mm or more, specifically 30 to 60 mm, and the length of the interval between the elastic wires 5. The length I is 30 mm or less, specifically, 15 to 30 mm. As a result, the same effects as in the fourth embodiment can be obtained, but it is easier to select the one having a large maximum opening width W and a small interval length I. Others are the same as those of the basket type lithotripter 10 in the second embodiment described above.

<Supplementary Note> (1) In an endoscope treatment tool provided with a basket made up of a plurality of elastic wires at the distal end of an operation wire inserted into a sheath, when the basket is opened to the maximum. An endoscope treatment tool, wherein the ratio (W / L) of the opening width W to the axial length L at that time is 0.5 to 0.9.

(2) In an endoscope treatment tool having a basket composed of a plurality of elastic wires at the distal end of an operation wire inserted into a sheath, an opening width W of the basket is provided.
And the length I between the adjacent elastic wires constituting the basket,

[0022]

(Equation 2) A treatment tool for an endoscope, characterized in that:

(3) In an endoscopic treatment true having a basket composed of at least four elastic wires at the distal end of the operation wire inserted into the sheath, the opening width W of the basket is set to 30 mm or more. And a length I between adjacent elastic wires constituting the basket is 30 mm or less. (4) The treatment tool for an endoscope according to Appendix 3, wherein the treatment tool for an endoscope is a calculus breaking device.

[0024]

According to the present invention, the ratio (W / L) of the maximum opening width W of the basket to the length L in the axial direction at that time is set to 0.5 to 0.9, whereby the basket is formed. The part with the maximum opening width does not separate from the distal end of the sheath, the opening width of the basket is secured securely, and the capture of stones and the like becomes easy. In addition, it is possible to reliably take in a calculus or the like even in a part of the body cavity where the front is closed.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a portion near a distal end of a basket-type grasping forceps according to a first embodiment.

FIG. 2 is an explanatory diagram of a portion near a distal end of a basket-type grasping forceps according to a second embodiment.

FIG. 3 is an explanatory view of a treatment tool for an endoscope according to a third embodiment.

FIG. 4 is a front view of a basket of a basket-type grasping forceps according to a fourth embodiment.

FIG. 5 is a front view of a basket of a basket-type grasping forceps according to a fifth embodiment.

FIG. 6 is a front view of a basket of a basket-type grasping forceps according to a sixth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Basket type grasping forceps, 2 ... Sheath, 3 ... Operation wire, 4 ... Basket, 5 ... Elastic wire, 6 ... Tip, 7a-7c ... Bending point, L ... Length of basket in the axial direction, W ... Basket Maximum opening width.

Continuation of front page (72) Inventor Koichi Kawashima 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd.

Claims (1)

[Claims] 1. An endoscope treatment tool provided with a basket made up of a plurality of elastic wires at the distal end of an operation wire inserted into a sheath, wherein an opening width W when the basket is opened to the maximum. The ratio to the axial length L at that time (W
/ L) is 0.5 to 0.9.