JP3669732B2 - Wire connection structure of remote control part in treatment instrument for endoscope - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a structure for connecting a wire rope to a wire receiving portion of a remote operation portion in an endoscope treatment tool used for surgery or medical examination.
[0002]
[Prior art]
In the endoscope treatment tool shown in FIG. 6 as a similar product to the conventional one shown in Japanese Utility Model Publication No. 5-13409, the operation unit 1 includes an integrally formed cylinder 2 and a base end portion of the cylinder 2. A first finger hanging body 4 supported to be rotatable is provided, and a second finger hanging body 5 supported to be movable with respect to the cylindrical body 2 is provided. The second finger-hanging body 5 includes a main body 5a and a wire receiving portion 19, and the wire receiving portion 19 is divided into a pair of male screw parts 19a and 19b. When assembling the second finger-hanging body 5 to the cylindrical body 2, the main body 5 a is inserted into the outer periphery of the cylindrical body 2, and both male screw parts 19 a and 19 b are inserted into the notches 9 of the cylindrical body 2 so as to be combined with each other. Then, the main body 5a is screwed into the both male screw parts 19a, 19b (wire receiving part 19). When the both male screw parts 19a, 19b are combined, the proximal bent portion 34 of the wire 22 in the interlocking cable 21 passing through the cylinder 2 (actually, a protective pipe is inserted on the outer periphery of the wire) is connected to this wire. Connected to the receiving part 19. And the cutter 25 as a treatment part is remotely operated by the movement of the second finger-hanging body 5.
[0003]
[Problems to be solved by the invention]
In the conventional wire connection structure, as shown in FIG. 6 (refer to FIGS. 2 and 5 of the above publication for details), the proximal end bent portion 34 of the wire 22 is bent in a U shape to form both male screw parts 19a and 19b. The rectangular portion of the U-shaped base bent portion 34 is retained by the male screw parts 19a and 19b so that it cannot be removed.
[0004]
However, in order to securely lock the proximal end bent portion 34 so that it does not inadvertently come off between both male screw parts 19a, 19b, the proximal end bent portion 34 is sufficiently bent and formed into a U shape, for example. The molding operation and the wire connecting operation were very troublesome.
[0005]
An object of the present invention is to improve the wire connection structure and facilitate the forming operation and the wire connection operation of the proximal bent portion of the wire.
[0006]
[Means for Solving the Problems]
As shown in the drawings of the embodiments described later, the endoscope treatment tool according to the present invention is configured as follows.
In this endoscopic treatment tool , the operation section (1) includes a first finger-hanging body (4) at the proximal end of the cylinder (2) of the main body (1a) and a cylinder of the main body (1a) . A second finger-hanging body (5) supported so as to be movable with respect to the body (2) . The second finger-hanging body (5) is provided with a wire receiving portion (19), and the proximal end portion of the wire rope (22, 23) in the interlocking rope (21) passing through the cylindrical body (2) of the main body (1a) is provided. It is connected to this wire receiving part (19). And the treatment part (25) provided in the front-end | tip part of the said interlocking rope (21) inserted in a body via an endoscope is a wire rope (22,23) by a movement of said 2nd finger hook (5). ) To be operated remotely.
[0007]
An insertion hole (20a) is formed in the sliding hole (20) inside the second finger-hanging body (5) with the wire receiving portion (19) interposed therebetween, and the main body (1a) is formed in the insertion hole (20a). The cylindrical body (2) is inserted and the wire receiving portion (19) is provided in the cylindrical body (2) of the main body (1a).
In the wire receiving portion (19) , a stop hole (27) through which the proximal end portion of the wire rope (22, 23) is inserted and a proximal end portion of the wire rope (22, 23) are inserted. And a pressing hole (28) extending along the interlocking cable extending direction (P) and communicating with each other.
[0008]
A wire pressing surface (30) is provided on the pressing portion (28) at a position eccentric with respect to the wire insertion center line (27a) of the stopper hole (27). The pressing body (31) is provided with a wire pressing surface (33), and the wire rope (22, 23) is provided between the wire pressing surface (33) and the wire pressing surface (30) of the pressing portion (28). The proximal bent portion (34) is sandwiched.
The stepped inner bottom portion of the pressing hole (28) at the boundary between the pressing hole (28) and the stopper hole (27) is eccentric with respect to the wire insertion center line (27a) of the stopper hole (27). In the position, the wire pressing surface (30) is provided so as to be inclined so as to approach the wire insertion center line (27a) of the stopper hole (27) from the pressing hole (28) side toward the stopper hole (27) side. Yes. The pressing body (31) inserted into the pressing hole (28) in the cylinder (2) of the main body (1a) has an obtuse angle with the wire pressing surface (30) of the pressing hole (28). A wire pressing surface (33) is provided to sandwich the proximal bent portion (34) of the wire cord (22, 23) bent into a rectangular shape.
[0009]
[Action]
In the present invention, the base end bending portion is simply inserted by inserting the base end portion of the wire rope (22, 23) into the stop hole (27) and press-contacting the base end bending portion (34) with the pressing body (31). The portion (34) is sandwiched between the wire pressing surface (30) of the pressing hole (28) and the wire pressing surface (33) of the pressing body (31), and the wire ropes (22, 23) are held by the wire receiving portion (19 ).
[0010]
【Example】
Hereinafter, an endoscope treatment tool according to an embodiment of the present invention will be described with reference to FIGS.
[0011]
As shown in FIGS. 1 and 2, the operation unit 1 includes a main body 1 a including a cylindrical body 2 and a mouth body 3, a first finger hanging body 4, and a second finger hanging body 5, which are separated from each other and molded. ing.
[0012]
The cylinder 2 is composed of a split cylinder 6 divided into two, and both split cylinders 6 are integrally formed of plastic, and are superposed on each other to form a cylindrical shape. In the superposed state, fitting portions 7 and 8 are respectively formed on the outer periphery of the distal end portion and the outer periphery of the proximal end portion of the cylindrical body 2, and between the split cylinders 6 of the cylindrical body 2 from the outer peripheral distal end side to the outer peripheral proximal end side. A notch 9 is extended, and a circumferential groove 10 (rotation guide portion) is formed in the cylindrical body 2 inside the fitting portion 8 on the base end side. The base end side of both the cuts 9 is opened in the extending direction of the cylindrical body 2 to form an open portion 9a.
[0013]
The mouth 3 is integrally formed of plastic and has a cylindrical shape. An insertion hole 11 is formed on the inner periphery of the distal end, and a fitting hole 12 is formed on the inner periphery of the proximal end. A fitting portion 7 on the outer periphery of the tip end portion of the cylindrical body 2 is inserted into the fitting hole 12 and supported by the mouth body 3 so that the tip end portions of the cylindrical body 2 are not separated from each other.
[0014]
The first finger hanging body 4 includes a cylindrical bottom body 13 and a finger hanging ring 14, which are separated from each other and integrally formed of plastic. The bottom body 13 is inserted into the fitting portion 8 on the outer periphery of the base end portion of the cylindrical body 2 and is supported by the bottom body 13 so that the base end portions of the cylindrical body 2 are not separated from each other. The finger ring 14 includes a head ring 15 and a neck shaft 16, and a circumferential protrusion 17 (a rotation guide portion) is formed on the outer periphery of the neck shaft 16. The circumferential protrusion 17 of the neck 16 is inserted into the circumferential groove 10 inside the proximal end of the cylindrical body 2, and the finger ring 14 is attached to the buttocks 13 and the fitting portion 8 of the cylindrical body 2. It is supported so as to be rotatable around the extending direction.
[0015]
The second finger-hanging body 5 also shown in FIG. 3 is integrally formed of plastic and has a cylindrical shape. In the second finger-hanging body 5, a finger-holding groove 18 is formed on the outer periphery thereof, and a wire receiving portion 19 is laid in a bridge shape on the lower half portion of the inner sliding hole 20. An insertion hole 20a is formed in the sliding hole 20 across the surface. The split cylinders 6 of the cylindrical body 2 are inserted into the insertion holes 20 a so that the inner peripheral surface of the sliding hole 20 is in sliding contact with the outer peripheral surface of the cylindrical body 2, and the second finger hook body 5 is in contact with the cylindrical body 2. It is supported so as to be movable in the extending direction.
[0016]
The interlocking measure 21 is inserted into the body through an endoscope (not shown), and includes a wire 22, a protective pipe 23, a protective coil 24, and a cutter 25 (treatment part). The proximal end portion of the wire 22 is inserted into the protective pipe 23 and soldered in the cylindrical body 2, and the wire 22 and the protective pipe 23 (wire rope) are connected to the second finger hook under the wire connection structure described later. It is connected to the wire receiving part 19 of the body 5. The protective coil 24 is wound around the outer periphery of the wire 22 and the protective pipe 23, and the base end portion of the protective coil 24 is soldered in the mouth 3 and pulled out from the insertion hole 11. A pair of small arms 26 are provided at the tip of the protective coil 24, and the cutter 25 is attached between the small arms 26. The cutter 25 is connected to the tip of the wire 22 and opens and closes around a support shaft 26 a on both small arms 26.
[0017]
In particular, the wire receiving portion 19 of the second finger-hanging body 5 employs the following wire connection structure as shown in FIGS.
A stop hole 27 extends in the lower half of the wire receiving portion 19 along the interlocking cable extending direction P (the cylinder extending direction), and the upper half of the wire receiving portion 19 is more than the stop hole 27 in the upper half. A large-diameter pressing hole 28 (pressing portion) extends along the interlocking cable extending direction P, the stop hole 27 and the pressing hole 28 communicate with each other, and their center lines 27a and 28a coincide with each other. . A female screw 29 is formed on the inner periphery of the pressing hole 28. On the stepped inner bottom portion of the pressing hole 28 at the boundary between the lower end portion of the pressing hole 28 and the upper end portion of the stopper hole 27, the center lines 27a, It is inclined so as to approach 28a and has a conical shape. A shallow groove-like wire pressing surface 30 is provided on the stepped inner bottom of the pressing hole 28 so as to extend in the radial direction from the center lines 27a, 28a at a position eccentric to the center lines 27a, 28a. The pressing body 31 is a machine screw having a head portion and a shaft portion, a male screw 32 is formed on the outer periphery of the shaft portion, and a wire pressing surface 33 which is a lower end surface of the shaft portion is from the head side to the shaft portion side. As it goes to, it is inclined so as to approach the center line 31a and has a conical shape. The inclination angle of the wire pressing surface 33 substantially matches the inclination angle of the wire pressing surface 30 of the pressing hole 28.
[0018]
In the protective pipe 23 into which the proximal end portion of the wire 22 is inserted, after being inserted into the stop hole 27 from the state of FIG. 3, it is further inserted into the press hole 28, and as shown in FIG. The proximal bent portion 34 is formed by being bent together with the wire 22 by a jig or the like in accordance with the inclination angles 30 and 33. The base end bent portion 34 is only slightly bent into an obtuse rectangular shape. Then, as shown in FIG. 4B, the proximal bent portion 34 is applied to the wire pressing surface 30 of the pressing hole 28 and is exposed from the wire pressing surface 30. A pressing body 31 is inserted and screwed into the pressing hole 28, and a proximal bent portion 34 of the protective pipe 23 is interposed between the wire pressing surface 33 of the pressing body 31 and the wire pressing surface 30 of the pressing hole 28. Is pinched. Therefore, the wire 22 and the protective pipe 23 (wire cord) do not fall out carelessly.
[0019]
When a finger is put on the finger ring 14 of the first finger hanger 4 and the finger hanger groove 18 of the second finger hanger 5 and the second finger hanger 5 is reciprocated in the interlocking cable extending direction P in the cylinder 2, the wire The cutter 25 opens and closes via 22.
[0020]
This embodiment is characterized by the following (a) to (f).
(A) Since the proximal bent portion 34 of the protective pipe 23 is sandwiched and pressed between the wire pressing surface 30 of the pressing hole 28 and the wire pressing surface 33 of the pressing body 31, the proximal bent portion 34. Can be reliably prevented by accidentally falling off the protective pipe 23. Therefore, it becomes easy to perform the forming operation of the proximal bent portion 34.
[0021]
(B) Since the base end bent portion 34 of the protective pipe 23 is sandwiched at an eccentric position with respect to the wire insertion center line 27a of the stop hole 27, the base end bent portion 34 is merely bent slightly into an obtuse shape. As a result, the protective pipe 23 can be prevented from being inadvertently pulled out. Therefore, it becomes easy to perform the forming operation of the proximal bent portion 34.
[0022]
(C) Since the protective pipe 23 can be connected to the wire receiving portion 19 simply by inserting the protective pipe 23 into the stop hole 27 and press-contacting the proximal bent portion 34 with the pressing body 31, the wire connecting operation can be easily performed.
[0023]
(D) Since the protective pipe 23 is inserted into the stop hole 27, the protective pipe 23 can be stabilized and the inadvertent drop-off can be surely prevented.
(E) Since the male and female screws 29 and 32 are used for the insertion of the pressing hole 28 and the pressing body 31, the press contact with the proximal bent portion 34 of the protective pipe 23 can be reliably maintained.
[0024]
(F) When assembling the second finger hanger 5 to the cylinder 2, the both split cylinders 6 of the cylinder 2 are respectively inserted into both insertion holes 20 a of the second finger hanger 5 from the base end side. Since it is only necessary to insert the wire receiving part 19 of the second finger-hanging body 5 into the notch 9 between the split cylinders 6 from the base end side opening part 9a, the assembling can be performed easily.
[0025]
In addition to the above embodiments, the following configurations (a) to (b) may be used.
(A) As shown in FIG. 5, an eccentric pin having a head portion and a shaft portion is used as the pressing body 31 of the second finger hanger 5 in place of the machine screw. The point that the wire pressing surface 33 that is the lower end surface of the shaft portion of the pressing body 31 is inclined so as to approach the center line 31a from the head side toward the shaft portion side is conical. Similarly, the apex 33a of the cone is eccentric with respect to the center line 31a. The stepped inner bottom portion of the pressing hole 28 into which the pressing body 31 is inserted also has an eccentric conical shape in accordance with the conical shape of the pressing body 31. When the base end portion of the protective pipe 23 is inserted into the pressing hole 28 from the stop hole 27 as shown in FIG. 5A, and the pressing body 31 is inserted into the pressing hole 28 as shown in FIG. The proximal end portion of the protective pipe 23 is bent into a shape that is pressed by the eccentric wire pressing surface 33 of the pressing body 31, and the proximal bending portion 34 is pressed by the wire pressing surface 30 of the pressing hole 28 and the wire pressing of the pressing body 31. It is clamped and pressed between the surface 33.
[0027]
【The invention's effect】
According to the endoscope treatment tool of the present invention, the wire cord (22, 23) can be obtained by simply pinching the proximal bent portion (34) of the slightly bent wire cord (22, 23) with the pressing body (31). 23) can be prevented from being accidentally pulled out, and it becomes easy to perform the forming operation of the proximal bent portion (34), and the wire connecting operation can be easily performed.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an endoscope treatment tool according to an embodiment of the present invention.
2A is an assembled front view showing the endoscope treatment tool of FIG. 1, and FIG. 2B is a sectional view of FIG.
3A is an enlarged cross-sectional view showing the second finger-hanging body of FIG. 1 and a wire rope and a pressing body separated therefrom, and FIG. 3B is a cross-sectional view taken along line XX of FIG.
4A is an enlarged cross-sectional view showing a state in which the wire rope is inserted into the second finger-hanging body from the state of FIG. 3A, and FIG. 4B is a second view of the pressing body from the state of FIG. It is an expanded sectional view which shows the state which screwed to the finger-hook body and connected the wire rope.
5A is a view corresponding to FIG. 4A according to another embodiment, and FIG. 5B is a view corresponding to FIG. 4B.
6A is a plan view showing a conventional endoscope treatment tool, and FIG. 6B is a partial cross-sectional view taken along line YY of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Operation part, 1a ... Main body, 2 ... Cylindrical body, 3 ... Mouth body, 4 ... 1st finger hanging body, 5 ... 2nd finger hanging body, 13 ... Butt body, 14 ... Finger hanging ring, 19 ... Wire receiving part, 21 ... interlocking cord, 22 ... wire (wire cord), 23 ... protective pipe (wire cord), 25 ... cutter as treatment part, 27 ... stop hole, 27a ... center line, 28 ... pressing hole (pressing part), 28a ... Center line, 29 ... female screw, 30 ... wire pressing surface, 31 ... pressing body, 31a ... center line, 32 ... male screw, 33 ... wire pressing surface, 34 ... proximal bent portion, P ... interlocking cable extending direction.

Claims (1)

The operation unit (1), the first finger placing member at the proximal end of the tubular body (2) of the body (1a) and (4), movably with respect to the tubular body of the body (1a) (2) A supported second finger hanger (5),
The second finger-hanging body (5) has a wire receiving portion (19) for connecting the base end portion of the wire rope (22, 23) in the interlocking rope (21) passing through the cylindrical body (2) of the main body (1a). Provided,
A treatment portion (25) provided at the distal end portion of the interlocking cord (21) inserted into the body via an endoscope is moved via the wire cord (22, 23) by the movement of the second finger hanging body (5). In an endoscope treatment tool operated by remote control,
An insertion hole (20a) is formed in the sliding hole (20) inside the second finger-hanging body (5) with the wire receiving portion (19) interposed therebetween, and the main body (1a) is formed in the insertion hole (20a). The wire receiving portion (19) is inserted into the cylindrical body (2) of the main body (1a) through the cylindrical body (2).
In the wire receiving portion (19) , a stop hole (27) through which the proximal end portion of the wire rope (22, 23) is inserted and a proximal end portion of the wire rope (22, 23) are inserted. The pressing hole (28) extending along the interlocking cable extending direction (P) and communicating with each other, and the pressing hole (28) at the boundary between the pressing hole (28) and the stop hole (27) ( the stepped inside bottom of 28), wire insertion center line of the retaining hole (27) (27a) at a position eccentric to, Wa ear pressing surface (30) stopped from pushing hole (28) side holes (27) Inclined so as to approach the wire insertion center line (27a) of the stop hole (27) as it goes to the side, and is inserted into the pressing hole (28) in the cylindrical body (2) of the main body (1a). that the pressing body (31), songs folding obtuse Ku shape between the wire pressing surface of the pressing hole (28) (30) It was wire rope (22, 23) based Hasho of the remote control unit in the endoscopic treatment tool, wherein the <br/> by providing wire pressing surface for sandwiching curved portion (34) (33) Wire connection structure.

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