JPH1133032A - Structure of treatment part in treatment implement for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the amount of tissue which can jut out of an aperture, so that the amount by which the tissue is cut can also be increased, by increasing the area of the aperture while keeping its strength. SOLUTION: The maximum clearance between two points where one coordinate axis X crosses an inner peripheral corner 23 is C=A+2Sa , and the maximum clearance between two points where the other coordinate axis Y crosses the inner peripheral corner 23 is D=B+2b . Since both of cup blades 7, 8 have a relation of C<D, (A+2Sa )<(B+2Sb ). Since an interval Sa need be not less than a certain level from the standpoint of strength, the maximum space A which is the minor diameter of the elliptical inner edge 22a of an aperture 22 cannot be made greater than a certain level. However, since the inner edge 22a of the aperture 22 is made elliptical, the maximum space B, i.e., its major diameter, increases, and the area of the aperture 22 increases accordingly. Moreover, the strength can be maintained by keeping the interval Sa at a certain level or higher. Since the intervals Sa , Sb are made almost the same, the distance between the elliptical inner edge 22a and the inner peripheral corner 23 is easy to hold constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment device for an endoscope used for an operation, a medical examination or the like, which has a structure of a treatment portion provided at a distal end portion of an interlocking member inserted into a body through an endoscope. It is about.

[0002]

2. Description of the Related Art A treatment section of a conventional endoscope treatment tool includes a first cup blade and a second cup blade which can be opened and closed by an interlocking member. FIG. 5 (a)
As shown in (b), both cup blades 7, 8 have an opening 22 in the bottom wall portion 18. Both cup blades 7,
When the cutting edges 8 are closed and their cutting edges 21 abut each other on the outer periphery of the opening 20a to cut the tissue, the tissue is put into the two accommodation recesses 20 which overlap each other. In that case, the tissue in both storage recesses 20 protrudes outward from the opening 22 of the bottom wall portion 18, so that more tissue than the volume in both storage recesses 20 can be cut.

[0003]

The inner peripheral edge 22a of the opening 22 has a circular shape and is closed endlessly. Assuming coordinate axes X and Y which intersect each other at a coordinate center O which is the center of the circle and are on a plane along the bottom wall portion 18, one coordinate axis X intersects the circular inner peripheral edge 22a. The maximum spatial distance A between points and the maximum spatial distance B between two points where the other coordinate axis Y intersects the circular inner peripheral edge 22a are circular diameters, and are the same (A = B). .

An inner peripheral corner 23, which is a boundary between the bottom wall portion 18 and the peripheral wall portion 19, is closed endlessly on the outer periphery of the inner peripheral edge 22a of the opening 22. One of the coordinate axes X is the inner corner 2
Said two points intersecting the 3 and both neighboring distance S _a between the two points intersecting the circular inner peripheral edge 22a of the aperture 22, the other coordinate axis Y is the two points intersecting the inner corners 23 the both adjacent distance between the two points intersecting the circular inner peripheral edge 22a of the opening 22 with the S _b, one coordinate axis X is the inner circumferential corner portion 2
The maximum distance between two points intersecting 3 is C = A + 2S _a ,
The other coordinate axis Y is the maximum distance between two points crossing the inner corners 23 This and D = B + 2S _b. Generally, since C <D in both cup blades 7 and 8, (A + 2S _a )
<From (B + 2S _b) a and A = B, the S _a <S _b.

However, since the adjacent distance _Sa is required to be a certain value or more in terms of strength, the maximum spatial distance A, which is the diameter of the circular inner peripheral edge 22a, cannot be made larger than a certain value. Therefore, the area of the opening 22 is limited. Therefore, opening 2
The amount of tissue that can protrude from the outside decreases, which adversely affects the amount of tissue cut.

An object of the present invention is to improve an aperture so as to increase the amount of tissue that can protrude outward from the aperture.

[0007]

The present invention will be described with reference to the reference numerals in the drawings of each embodiment described later. In the treatment tool for an endoscope according to the first aspect of the present invention, the treatment section (3) provided at the distal end of the interlocking member (2) inserted into the body via the endoscope is provided with the interlocking member (2). And is remotely operated by the operation unit (1) via the controller. The treatment section (3) includes a first cup blade (7) and a second cup blade (8) provided so as to be capable of being opened and closed by an interlocking member (2). The two cup blades (7, 8) are connected to the bottom wall (18).
And a peripheral wall portion (19) provided on the outer periphery of the bottom wall portion (18).
And a storage recess (20) surrounded by the bottom wall (18) and the peripheral wall (19), and an opening (20a) of the storage recess (20) facing the bottom wall (18). (19)
Cutting edge (21) provided at the edge of the bottom wall (18)
And an opening (22). Then, when the cup blades (7, 8) are closed and moved, the storage recesses (2,
0) are polymerized, and the storage recesses (20) are opened in a state where both cup blades (7, 8) are in the open state.

The bottom wall (1) of the two cup blades (7, 8)
8) In the first direction (X) and the second direction (Y) orthogonal to each other along the bottom wall portion (18) and the peripheral wall portion (19).
At the inner peripheral corner (23) of the storage recess (20), which is the boundary between the inner peripheral corner (23) in the first direction (X) and the second direction (Y) than the distance (C) between the opposing inner peripheral corners (23). ) Opposing inner peripheral corners (23)
When the distance (D) between them is large, the first direction (X) can be set even at the inner peripheral edge (22a) of the opening (22) inside the inner peripheral corner (23) of the storage recess (20). The distance (B) between the opposing inner peripheral edges (22a) in the second direction (Y) is larger than the distance (A) between the opposing inner peripheral edges (22a).

[0009] The endoscopic treatment tool according to the second aspect of the present invention.
In addition, the following configuration is added to the invention of claim 1.
You. On the inner periphery (22a) of the aperture (22) and its outer periphery
Each adjacent distance between the inner peripheral corner (23) of the storage recess (20).
In the first direction (X) _a)
And the adjacent distance in the second direction (Y) (S_b) And almost the same
I'm one.

[0010]

DETAILED DESCRIPTION OF THE INVENTION

First Embodiment First, an endoscope treatment tool according to a first embodiment of the present invention will be described with reference to FIGS.

<Outline of Endoscope Treatment Tool> As shown in FIG. 1A, an interlocking member 2 pulled out from an operation unit 1 is inserted into a body through an endoscope (not shown). The treatment section 3 is attached to the distal end of the interlocking member 2.

As shown in FIGS. 1 (b), 2 (a) and 2 (b), both arms 5, 6 are attached to the distal end of the outer peripheral protection coil 4 of the interlocking member 2. The first cup blade 7 and the second cup blade 8 are rotatably supported on the arms 5 and 6 by a fixed center support shaft 9. The two cup blades 7 and 8 are opened and closed by an opening and closing link mechanism 10 described later. This opening / closing link mechanism 10
The operation unit 1 is remotely operated by the operation unit 1 via the operation wire 11 of the interlocking member 2 and operates.

<Details of the opening / closing link mechanism 10> The first interlocking lever 1 integrally extended from the first cup blade body 7.
2 and a second interlocking lever 13 integrally extended from the second cup blade 8, connecting holes 14, 15 are penetrated, and each of the connecting holes 14, 15 has one link wire 1.
6 and 17 are inserted and hooked. Both ends 16a, 17a of the link wires 16, 17 are welded and connected to the operation wire 11 of the interlocking member 1 while being applied to the outer peripheral surface of the distal end 11a. Each of the link wires 16 and 17 has a certain degree of rigidity and flexibility.

As shown in FIGS. 1A and 1B and FIG. 2A, when the operation wire 11 is pulled by operating the remote control by the operation unit 1, the first interlocking lever is connected by the link wires 16 and 17. As shown in FIG. 12 and the second interlocking lever 13 rotate in the direction to close each other, and the first cup blade 7 and the second cup blade 8 close each other. When the operation wire 11 is pressed by remote control using the operation unit 1, as shown in FIG. 2B, the return force of the protection coil 4 is also applied thereto, and the first interlocking lever 1
2 and the second interlocking lever 13 rotate in a direction to open each other,
The first cup blade 7 and the second cup blade 8 open each other.

<Details of Both Cup Blades 7, 8> FIG.
As shown in FIGS. 3A and 3B and FIGS. 3A and 3B, the cup blades 7 and 8 are formed by metal injection molding, and have a bottom wall 18 and an outer periphery of the bottom wall 18. , A storage recess 20 surrounded by the bottom wall 18 and the peripheral wall 19,
An edge portion of the peripheral wall portion 19 is provided at an opening portion 20a of the storage recess portion 20 facing the front end portion, and an opening 22 formed in the bottom wall portion 18 is provided. When the cup blades 7 and 8 are in the closed and moved state, their cutting edges 21 are opened.
When the cup recesses 7 and 8 are in the open state, the cutting edge portions 21 are separated from each other on the outer periphery of the opening 20a and the storage recess 20 is opened.

As shown in FIG. 3, the opening 22 has the following characteristic configuration of *. * An inner peripheral corner 23 of the storage recess 20 which is a boundary between the bottom wall 18 and the peripheral wall 19 is closed endlessly, and an inner peripheral edge 22 a of the opening 22 inside the inner peripheral corner 23. Is closed endlessly. Assuming coordinate axes X and Y that intersect at right angles with each other at an arbitrary coordinate center O inside the inner peripheral edge 22a of the opening 22 and are on a plane along the bottom wall portion 18, one of the coordinate axes X is defined as The maximum distance D between any two points at which the other coordinate axis Y intersects the inner corner 23 is larger than the maximum distance C between any two points intersecting the inner corner 23. In addition, the maximum spatial distance B between any two points where the other coordinate axis Y intersects the inner peripheral edge 22a is larger than the maximum spatial distance A between any two points where one coordinate axis X intersects the inner peripheral edge 22a.
Is increasing. More specifically, the inner peripheral edge 22a
Has an elliptical shape, the center of the ellipse corresponds to the orthogonal coordinate center O (centroid), the minor axis of the ellipse corresponds to the maximum spatial distance A on the coordinate axis X, and the major axis of the ellipse corresponds to the coordinate axis. It is on Y and corresponds to the maximum spatial distance B.

That is, in the first direction X corresponding to one coordinate axis X and the second direction Y corresponding to the other coordinate axis Y, the storage recess 20 is a boundary between the bottom wall 18 and the peripheral wall 19.
At the inner peripheral corner 23 of the inner peripheral corner 2 opposed in the first direction X
When the distance (corresponding to the maximum separation distance D) between the opposed inner peripheral corners 23 in the second direction Y is greater than the distance between the three (corresponding to the maximum separation distance C), the inner periphery of the storage recess 20 is formed. Even at the inner peripheral edge 22a of the opening 22 inside the corner portion 23, the distance between the opposing inner peripheral edges 22a in the first direction X (corresponding to the maximum spatial distance A) is smaller than the distance between the opposing inner peripheral edges 22a in the second direction Y. Perimeter 22a
The distance between them (corresponding to the maximum spatial distance B) is increased.

* In the specific rectangular coordinate axes X and Y that produce the maximum spatial distances A and B between the two points in the opening 22,
One coordinate axis X and the two adjacent distance S _a between the two points intersecting the inner peripheral edge 22a of the aperture 22 and two points intersecting the inner peripheral corner portion 23 this, the other coordinate axis Y is the inner circumferential corner and both neighboring distance S _b between the two points intersecting the part 23 and the two points intersecting the inner peripheral edge 22a of the opening 22, are substantially the same.
That is, at the respective adjacent distances between the inner peripheral edge 22a of the opening 22 and the inner peripheral corner 23 of the storage recess 20 on the outer periphery, both the adjacent distance Sa in the first direction X and the adjacent distance _Sa in the second direction Y The two adjacent distances _Sb are substantially the same.

<Characteristics of First Embodiment> The first embodiment has the following characteristics *. * In FIG. 3 (b), the maximum separation distance between two points where one coordinate axis X intersects the inner peripheral corner 23 is C = A + 2S.
_a, the maximum distance between two points and the other coordinate axis Y intersects the inner peripheral corner portion 23 and D = B + 2S _b. Generally, since C <D in both cup blades 7 and 8, (A + 2S
_a ) <(B + 2S _b ).

[0020] The neighboring distance S _a so requires more than a predetermined on strength can not be increased constant than the maximum spatial distance A is a minor axis of the ellipse in the periphery 22a of the opening 22. This is the same as in the case of the prior art.

However, since the inner peripheral edge 22a of the opening 22 is made elliptical, the maximum spatial distance B, which is the major axis thereof, increases. Therefore, the area of the opening 22 is larger than that of the circular inner peripheral edge 22a shown in the related art. Accordingly, the amount of tissue that can protrude outward from the opening 22 is increased, and the amount of tissue cut can be increased. Moreover, the strength can be maintained by maintaining the adjacent distance Sa at _a certain value or more.

* In FIG. 3B, the adjacent distance S _a and the adjacent distance S _b are almost the same. Therefore, the distance between the inner peripheral edge 22a of the ellipse and the inner peripheral corner 23 is easily set to be constant. Therefore, an average strength can be obtained over the entire outer periphery of the opening 22.

[Other Embodiments] In addition to the first embodiment, the following configuration may be adopted. In the second embodiment shown in FIG. 4A and the third embodiment shown in FIG. 4B, the shape of the opening 22 is changed as follows, as compared with the first embodiment. However, it has basically the same configuration and effect. That is, the inner peripheral edge 22a of the opening 22 in the second embodiment is opposed to the two straight portions 22 which are parallel to each other.
and a _1, and a bi semicircular arc portions 22a ₂ Metropolitan connecting the one end and between the other end of the two linear portions 22a _1. The center O of rectangular coordinates shown in FIG. 4A is the center of gravity of the shape of the inner peripheral edge 22 a of the opening 22. Further, the inner peripheral edge 22a of the opening 22 of the third embodiment, the opposite to the both straight portions 22a ₁ parallel to, the semicircular arc portion 22a ₂ which connects between the both straight portions 22a ₁ end,
Consisting straight portion 22a ₃ Metropolitan connecting the other ends thereof are perpendicular to the two straight portions 22a _1. The orthogonal coordinate center O shown in FIG. 4B is not the center of gravity of the shape of the inner peripheral edge 22a of the opening 22 but an arbitrary orthogonal coordinate center that is slightly shifted from the center of gravity.

[0024]

According to the treatment tool for an endoscope according to the first aspect of the present invention, the area of the opening (22) can be increased while maintaining the strength, and it protrudes outward from the opening (22). The amount of tissue obtained can be increased, and the amount of tissue cut can be increased.

According to the treatment tool for an endoscope according to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the inner peripheral edge (22a) of the opening (22) and the inner periphery of the storage recess (20) are provided. Corner (2
3) can be easily set to be constant, and an average strength can be obtained over the entire outer periphery of the opening (22).

[Brief description of the drawings]

FIG. 1A is a partially cutaway front view showing an entire endoscope treatment tool according to a first embodiment, and FIG. 1B shows a treatment section in which both cup blades are closed (a). FIG.

FIG. 2 (a) is a front sectional view of FIG. 1 (b),
(B) is a front sectional view showing the treatment section in which both cup blades of (a) are opened.

3 (a) is a front sectional view showing the double cup blade body of FIG. 2 (a), and FIG. 3 (b) is a side view of the both cup blade bodies of FIG. 2 (a) as viewed from the blade tip side.

FIG. 4A is a side view of the two cup blades according to the second embodiment viewed from the blade tip side, and FIG. 4B is a view of the both cup blades according to the third embodiment viewed from the blade tip side. FIG.

FIG. 5A is a front sectional view showing a conventional double cup blade, and FIG. 5B is a side view of the double cup blade of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Operation part, 2 ... Interlocking member, 3 ... Treatment part, 7 ... First cup blade body, 8 ... Second cup blade body, 18 ... Bottom wall part, 19 ... Peripheral wall part, 20 ... Storage recessed part, 20a ... Opening Part, 21: Blade edge, 22: Opening, 22a: Inner peripheral edge of opening, 23: Inner peripheral corner of storage recess, O: Coordinate center, X: Coordinate axis (first direction), Y
... Coordinate axes (second direction), A, B ... Maximum aperture spatial distance,
C, D: maximum distance between inner corners, S _a , S _b : adjacent distance.

Claims (2)

[Claims] 1. A treatment tool for an endoscope in which a treatment section provided at a distal end portion of an interlocking member inserted into a body via an endoscope is remotely operated by an operation section via the interlocking member, and is operated. The treatment section includes a first cup blade body and a second cup blade body provided so as to be able to open and close with each other by an interlocking member, and both cup blade bodies have a bottom wall portion and an outer periphery of the bottom wall portion. , A storage recess enclosed by the bottom wall and the peripheral wall, a cutting edge provided at an edge of the peripheral wall at an opening of the storage recess facing the bottom wall, And the storage recesses are overlapped when both cup blades are closed, and the storage recesses are opened when both cup blades are open. The boundary between the bottom wall and the peripheral wall in the first direction and the second direction orthogonal to each other along the bottom wall. When the distance between the opposed inner peripheral corners in the second direction is larger than the distance between the opposed inner peripheral corners in the first direction at the inner peripheral corner of the storage recess, the inner peripheral corner of the storage recess The distance between the opposing inner peripheral edges in the second direction is made larger than the distance between the opposing inner peripheral edges in the first direction even at the inner peripheral edge of the opening inside the endoscope. Structure of the treatment section in the treatment tool. 2. An adjacent distance between an inner peripheral edge of an opening and an inner peripheral corner of a storage recess on an outer periphery thereof, wherein an adjacent distance in the first direction and an adjacent distance in the second direction are substantially the same. The structure of the treatment section in the treatment tool for an endoscope according to claim 1, wherein: