JPH09201365A - Treatment part structure in treatment tool for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a connection work between a support shaft and respective connection links by applying pressure on a male screw part of the support shaft so as to swell the ridge and providing a pull-out prevention fixing means for being fixed to a female screw hole in a treatment part provided in the tip part of a moving cord inserted into the body via an endoscope. SOLUTION: In a connecting structure of a support shaft 14, the support shaft 14 is formed from a lock shaft part 25 and a male screw part 28 and the lock shaft part 25 is formed from a circular dished lock head part 26 having a rotating groove 26a in its end and a columnar neck part 27 continuing to the male screw part 28. Further, the female screw hole 29 is formed in a connecting link 9, a lock hole 30 is formed in a connecting link 12, and the male screw part 28 of the support shaft 14 is threadly engaged with the female screw hole 29 in such a state as putting the both connecting links 9, 12 on top of each other. Pressure (F) is applied on the end face of the male screw part 28 by a punch, etc., with the lock head part 26 supported thereby so that a V-shaped recessed part 43 is formed, each ridge of the male screw is swelled so as to be in pressure contact with and fixed to each ridge of the female screw hole 29.

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 used for surgery, medical examinations, etc., and has a structure of a treatment portion provided at a distal end portion of an interlocking cord inserted into the body through an endoscope. It is about.

[0002]

2. Description of the Related Art In a treatment section of a conventional endoscopic treatment tool disclosed in Japanese Examined Patent Publication No. 1498/1990, a plurality of connecting links for transmitting movements of interlocking lines to various treatment bodies and a plurality of these connecting links. And a plurality of support shafts that support the. Of each of the first connecting link and the second connecting link, which are connected to each other, a fixed shaft portion that is inserted into a fixing hole formed in the first connecting link and a flat link member formed in the second connecting link. There is a countersunk head that is inserted into the stop hole and sandwiches the second connecting link with the first connecting link.

The fixed shaft portion of each support shaft is laser spot welded so as not to come out from the fixed hole of the first connecting link.

[0004]

In the treatment section of the treatment instrument for endoscope, it is necessary to surely transmit a delicate remote operation by the operation section to various treatment bodies by the interlocking rope. Therefore, the connection structure between each connection link and each support shaft is important for smooth relative movement between each connection link.

The retaining means for fixing by utilizing the laser spot welding has the following drawbacks (a) to (b). (A) Since the supporting shaft is inserted into the locking hole and the fixing hole and the supporting head of the supporting shaft and each connecting link are appropriately pressure-welded, the fixed shaft portion of the supporting shaft is laser spot welded to the fixing hole. , It is difficult to adjust the tightening condition between the connecting links before welding. Further, if the welding is performed, the fixed shaft portion of the support shaft cannot be moved relative to the fixing hole, so that it is impossible to adjust the degree of tightening between the connecting links after the welding.

(B) Since the support shaft and each connecting link move relative to each other before welding, it is necessary to hold them in an appropriately pressed state, which makes the connecting work troublesome. It is an object of the present invention to provide a retaining and fixing means capable of easily adjusting a tightening degree between connecting links and connecting work between a support shaft and each connecting link.

[0007]

The present invention will be described with reference to the reference numerals of the drawings (FIGS. 1 to 6) of the embodiments described later. According to the present invention, as shown in FIG. 1 (a), a treatment section (3) provided at the tip of an interlocking cord (2) inserted into the body via an endoscope is remotely operated by an operation section (1). The present invention relates to a treatment tool for an endoscope that is operated in the following manner.

As shown in FIGS. 1 (b) and 2 (a) (b), in the treatment section (3), the interlocking rope (2) is used.
A plurality of connecting links (5a, 5b, 9, 10, 12, 13, 18) for transmitting the movement of the body to various treatment bodies (6, 7),
This plurality of connecting links (5a, 5b, 9, 10, 12,
One or more support shafts (11, 14, 1) that support (13, 18)
5, 16) and.

As shown in FIG. 3 or FIG. 4 or FIG. 5 or FIG. 6, the support shafts (11) (14) (15) (16) are
First connection links (5b) (9) (1) connected to each other
0) (13) and the second link (5a, 9, 10)
(12) (13) (12, 18) is screwed into female screw holes (23) (29) (35) (41) formed in the first connecting links (5b) (9) (10) (13). Male screw parts (22) (28) (34) (40) and second connecting links (5a, 9, 10) (12) (13) (12, 18)
The first connecting links (5b) (9) (10) (1) inserted through the locking holes (24) (30) (36) (42) formed in
3) and the second connection link (5a, 9, 10) (1
2) Locking shaft part (19) sandwiching (13) (12, 18)
(25), (31) and (37) are provided.

The support shafts (11) (14) (15) (1)
6) When the pressing force (F) is applied to the male screw parts (22), (28), (34) and (40), the male screw parts (22) (28)
(34) The threads of (40) swell and the female screw hole (2
3) The male threads (22) (28) (34) (40) are fixed to the female screw holes (23) (29) (35) (41) by pressing the respective threads of (29) (35) (41). A retaining locking means (M) is provided.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A structure of a treatment portion of a treatment instrument for an endoscope according to an embodiment of the present invention will be described below with reference to the drawings.

[Outline of treatment instrument for endoscope] FIG. 1
As shown in (a), the interlocking cable 2 pulled out from the operation unit 1 is inserted into the body through an endoscope (not shown), and a distal end of the interlocking cable 2 is treated. The part 3 is attached.

In this treatment section 3, as shown in FIGS. 1 (b) and 2 (a) (b), both arm-shaped connecting links 5a, 5b are attached to the tip of the outer peripheral protection coil 4 of the interlocking rope 2. The cup-shaped collecting blades 6 and 7 (treatment bodies) are supported by the open / close link mechanism 8 with respect to the connecting links 5a and 5b. In this open / close link mechanism 8, the connecting links 9 and 10 of both the sampling blades 6 and 7 are rotatably supported by the fixed center support shaft 11 between the arm-like connecting links 5a and 5b. The connecting links 12 and 13 are rotatably connected to the distal ends of the connecting links 12 and 13 by the permanent center support shafts 14 and 15, respectively, and the leading ends of the two connecting links 12 and 13 are rotated via the permanent center support shaft 16. Connected as possible. The distal end of an operation wire 17 in the interlocking cable 2 is attached to the permanent center support shaft 16 by a connection link 18.

When the operation wire 17 is pulled remotely by the operation section 1, the permanent central support shaft 16 is separated from the fixed central support shaft 11 in the opening / closing link mechanism 8 so that the two sampling blades 6 and 7 are separated from each other. Close and abut. Further, when the operation wire 17 is remotely operated and the operation wire 17 is pushed, the return force of the protection coil 4 is also applied to the operation wire 17, and the fixed center support shaft 11 of the opening / closing link mechanism 8 is permanently connected to the permanent center support shaft 1.
6 approaches, and the two collecting blades 6 and 7 open and separate from each other.

[Regarding the connection structure of the support shaft 11 shown in FIG. 3] The support shaft 11 includes a locking shaft portion 19 and a male screw portion 22. The locking shaft portion 19 is composed of a circular flat-shaped locking head portion 20 having a turning groove 20a on its end surface, and a columnar neck portion 21 extending from the locking head portion 20 and continuing to the male screw portion 22.

A female screw hole 23 is formed in one of the two arm-shaped connecting links 5a and 5b.
A locking hole 24 that is connected in series is formed over the other connecting link 5a and the connecting link 9 and the connecting link 10. The locking hole 24 includes a circular countersink portion 24a and a cylindrical neck hole portion 24b in the connecting link 5a, a cylindrical neck hole portion 24c in the connecting link 9, and a cylindrical neck hole portion 24d in the connecting link 10. .

As shown in FIG. 2 (b), both connecting links 9 and 10 are sandwiched between both arm-like connecting links 5a and 5b, and they are successively polymerized. The male screw portion 22 of the support shaft 11 is inserted from the side of the countersink portion 24a of the locking hole 24 so that the female screw hole 2
3, the neck portion 21 of the support shaft 11 is inserted into the respective neck hole portions 24b, 24c, 24d of the locking hole 24, and the flat-shaped locking head 20 of the support shaft 11 is fitted with the countersink portion 24a. Is fitted into. The end surface of the male screw portion 22 is a female screw hole 23.
In addition to being accommodated inside, the end surface of the countersunk locking head 20 is accommodated within the countersink portion 24a.

[Regarding the connection structure of the support shaft 14 shown in FIG. 4] The support shaft 14 includes a locking shaft portion 25 and a male screw portion 28. The locking shaft portion 25 is composed of a circular flat-shaped locking head portion 26 having a turning groove 26a on the end surface, and a cylindrical neck portion 27 extending from the locking head portion 26 and continuing to the male screw portion 28.

A female screw hole 29 is formed in the connecting link 9. A locking hole 30 is formed in the connecting link 12. The locking hole 30 includes a circular countersink portion 30a and a cylindrical neck hole portion 30b.

Both connecting links 9 and 12 are superposed on each other. The male screw portion 28 of the support shaft 14 is provided with the countersink portion 3 of the locking hole 30.
It is inserted from the 0a side and screwed into the female screw hole 29, and the spindle 1
The neck 27 of No. 4 is inserted into the neck hole 30b of the locking hole 30, and the countersunk head 26 of the support shaft 14 is fitted into the countersink 30a. The end surface of the male screw portion 28 is accommodated in the female screw hole 29, and the end surface of the countersunk locking head 26 is accommodated in the countersink portion 30a.

[Regarding the connection structure of the support shaft 15 shown in FIG. 5] The support shaft 15 includes a locking shaft portion 31 and a male screw portion 34. The locking shaft portion 31 is composed of a circular flat-shaped locking head portion 32 having a turning groove 32a on its end surface, and a cylindrical neck portion 33 extending from the locking head portion 32 and continuing to the male screw portion 34.

A female screw hole 35 is formed in the connecting link 10. A locking hole 36 is formed in the connecting link 13. The locking hole 36 has a circular countersink portion 36a.
And a cylindrical neck hole portion 36b.

Both connecting links 10 and 13 are superposed on each other. The male screw portion 34 of the support shaft 15 is inserted from the side hole portion 36a side of the locking hole 36 and screwed into the female screw hole 35, and the neck portion 33 of the support shaft 15 is inserted into the neck hole portion 36b of the locking hole 36. In addition, the countersunk head 32 of the support shaft 15 is fitted in the countersink 36a. The end surface of the male screw portion 34 is housed in the female screw hole 35, and the end surface of the countersunk locking head 32 is housed in the countersink portion 36a.

As shown in FIG. 2B, the connecting links 12, 9, 10, 13 are both arm-like connecting links 5a, 5b.
They are sandwiched between and are sequentially polymerized. [Regarding the connection structure of the support shaft 16 shown in FIG. 6]
The support shaft 16 includes a locking shaft portion 37 and a male screw portion 40. The locking shaft portion 37 includes a circular flat-shaped locking head portion 38 having a turning groove 38a on an end surface thereof, and a cylindrical neck portion 39 extending from the locking head portion 38 and continuous with the male screw portion 40.

A female screw hole 41 is formed in the connecting link 13. A locking hole 42 is formed across the connecting link 12 and the connecting link 18. This locking hole 42
Is composed of a circular countersink portion 42a and a cylindrical neck hole portion 42b in the connecting link 12, and a cylindrical neck hole portion 42c in the connecting link 18.

The connecting links 12, 18, 13 are superposed on each other. The male screw portion 40 of the support shaft 16 is inserted from the side of the counter bore 42a of the locking hole 42 and screwed into the female screw hole 41, and the neck portion 39 of the support shaft 16 has the neck hole portion 42b of the locking hole 42,
While being inserted through 42c, the countersunk head portion 38 of the support shaft 16 is fitted into the countersink portion 42a. The end surface of the male screw portion 40 is housed in the female screw hole 41, and the end surface of the countersunk locking head 38 is housed in the countersink portion 42a.

As shown in FIG. 2B, the connecting links 12, 18, 13 are sandwiched between the arm-like connecting links 5a, 5b, and they are sequentially superposed. [Regarding the retaining and fixing means M in each of the support shafts 11, 14, 15, 16] As shown in FIG. 3 or FIG. 4 or FIG. 5 or FIG.
When a pressing force F is applied to the end faces of the male screw parts 22, 28, 34, 40 with the locking heads 20, 26, 32, 38 supported by a punch or the like, a V-shaped recess 43 is formed on the end faces. The respective thread ridges of the male screw portions 22, 28, 34, 40 swell due to the component force f due to the volume reduction due to the recess 43, and the respective thread ridges of the female screw holes 23, 29, 35, 41 are pressed against each other. Therefore, the male screw portions 22, 28, 34, 40 can be fixed to the female screw holes 23, 29, 35, 41.

In the case shown in FIG. 3, both connecting links 9 and 10 move (rotate) relative to the support shaft 11 fixed to the arm-like connecting link 5b so as not to rotate. 5, the connecting link 12 moves relative to (rotates) the support shaft 14 fixed to the connecting link 9 in a non-rotatable manner, and in the case shown in FIG. 5, the support shaft fixed to the connecting link 10 in a non-rotatable manner. 6, the connecting link 13 moves relative to (rotates), and in the case shown in FIG. 6, both connecting links 12 and 18 move relative to the supporting shaft 16 fixed to the connecting link 13 so as not to rotate (rotate). ) Do.

This embodiment has the following characteristics (a) to (c). (A) Only by tightening the male screw portions 22, 28, 34, 40 of the support shafts 11, 14, 15, 16 at the time of temporary fixing before final fixing, the connection links 5a, 5b, 9, 1
0, 12, 13, 18 (FIG. 3 or FIG. 4 or FIG. 5 or FIG.
It is possible to easily adjust the degree of tightening between the combinations shown in FIG.

(B) Each of the connecting links 5a, 5b,
Male screw part 2 for tightening between 9, 10, 12, 13, 18
Since 2, 28, 34 and 40 are used, when the retaining locking means M is applied as described above after the temporary fixing of (a),
It can be performed while securely holding the tightened state of (a). Therefore, at the time of final fixing, each support shaft 11, 14, 1
5, 16 and each connecting link 5a, 5b, 9, 10, 12,
Connection work with 13, 18 can be easily performed.

(C) Each support shaft 11, 14, 15, 16 and each connecting link 5a, 5b, 9, 10, 12, 13, 18
Since the final fixing between and is carried out by the retaining means M, the connecting work thereof can be easily carried out.

In addition to the above embodiment, the following (a) to (c)
It may be configured as follows. (A) In the treatment portion structure of the treatment instrument for an endoscope, a fixing plate having a female screw hole (corresponding to the connecting link) and a fixing plate having a locking hole (corresponding to the connecting link) having a male screw portion are provided. It is also applied when fixing the shaft so that it cannot move relative to it.

(B) Change to a treatment body other than the above-mentioned sampling blades 6 and 7. (C) The end faces of the male screw portions 22, 28, 34, 40 are projected from the female screw holes 23, 29, 35, 41, or the end faces of the countersunk locking heads 20, 26, 32, 38 are countersunk.
You may make it protrude from a, 30a, 36a, 42a.

[0034]

According to the endoscopic treatment tool of the present invention, each connecting link (5a, 5b, 9, 10, 12, 1) is connected.
It is possible to easily adjust the degree of tightening between 3 and 18) and to perform the connecting work.

[Brief description of drawings]

FIG. 1A is a partially cutaway front view showing the entire treatment instrument for an endoscope according to the present embodiment, and FIG. 1B is a partially enlarged front view showing a treatment portion. .

2A is a partially enlarged front sectional view showing the treatment portion of FIG. 1B, and FIG. 2B is a partially enlarged side sectional view showing the treatment portion of FIG. 1B.

3A is a partially enlarged front sectional view of FIG. 2B, FIG. 3B is a left side view of FIG. 2A, and FIG.
FIG.

4A is a partially enlarged front sectional view of FIG. 2B, FIG. 4B is a left side view of FIG. 2A, and FIG.
FIG.

5 (a) is a partially enlarged front sectional view of FIG. 2 (b), (b) is a right side view of (a), and (c) is (b).
FIG.

FIG. 6 (a) is a partially enlarged front sectional view of FIG. 2 (b), (b) is a left side view of (a), and (c) is (b).
FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Operation part, 2 ... Interlocking rope, 3 ... Treatment part, 5a, 5b ... Arm-shaped connection link, 6, 7 ... Collection blade as a treatment body, 8 ...
Open / close link mechanism, 9 ... Connection link, 10 ... Connection link,
11 ... Support shaft, 12 ... Connection link, 13 ... Connection link, 1
4 ... Support shaft, 15 ... Support shaft, 16 ... Support shaft, 18 ... Connection link, 19, 25, 31, 37 ... Locking shaft portion, 22, 28,
34, 40 ... Male screw part, 23, 29, 35, 41 ... Female screw hole, 24, 30, 36, 42 ... Locking hole, F ... Pressing force,
M: retaining and fixing means.

Claims (1)

[Claims] 1. A treatment for an endoscope in which a treatment section (3) provided at the distal end of an interlocking cord (2) inserted into the body via an endoscope is remotely operated by an operating section (1). A plurality of connecting links (5) for transmitting the movement of the interlocking rope (2) to various treatment bodies (6, 7) in the treatment section (3).
a, 5b, 9, 10, 12, 13, 18) and the plurality of connecting links (5a, 5b, 9, 10, 12, 13, 13, 1)
8) supporting one or more support shafts (11, 14, 15, 1)
6), and the supporting shafts (11, 14, 15, 16) are connected to each other by a first connecting link (5b, 9, 10, 13) and a second connecting link (5a, 9, 10, 12, 13, 18), male screw portions (22, 28, 34,) screwed into female screw holes (23, 29, 35, 41) formed in the first connecting link (5b, 9, 10, 13). 40) and the locking holes (24, 30, 36, 42) formed in the second connecting links (5a, 9, 10, 12, 13, 18) to insert the first connecting links (5b, 9, 10). , 13) and a locking shaft portion (19, 25, 31, 37) sandwiching the second connection link (5a, 9, 10, 12, 13, 18), and the support shaft (11, 14). , 15, 16) male thread (2
2, 28, 34, 40) when a pressing force (F) is applied, each thread of the male screw part (22, 28, 34, 40) swells and each of the female screw holes (23, 29, 35, 41) An endoscope characterized in that it is provided with a retaining means (M) for press-fitting a screw thread to fix a male screw part (22, 28, 34, 40) to a female screw hole (23, 29, 35, 41). The structure of the treatment section in the treatment instrument.