JPH0595952A - Treating tool for endoscope - Google Patents

Abstract

PURPOSE:To obtain a treating device for endoscope in which a multiple turn coil sheath is linked to a single turn coil sheath without changing the inner diameter thereof to stabilize a working force value of a manipulating wire. CONSTITUTION:The numeral 1 indicates a multiple turn coil sheath and 2 a projected end face working line. A laser light 3 is made to irradiate on the projected end face working line 2 and a welding is performed between adjacent strands of a multi-turn coil sheath 1 to form a weld part 4. Thereafter, an end face working is performed along the projected end face working line 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment instrument for an endoscope constructed by using a multi-strand coil sheath formed by winding a plurality of metal element wires in a coil shape.

[0002]

2. Description of the Related Art A treatment instrument for an endoscope which passes through a forceps channel of an endoscope to perform various treatments on internal tissues will be described with reference to FIGS. 27 and 28 by taking biopsy forceps as an example. Treatment tool 31
Is a treatment section 32 provided at the distal end, an operation section 33 provided at the proximal side, an operation wire 34 for transmitting the motion of the operation section 33 to the treatment section 32 at the distal end, and the operation wire 34.
It mainly consists of a sheath 35 surrounding the.

As shown in FIG. 28, the treatment section 32 is pivotably attached to the sleeve 35 by a sleeve 36 fixed to the distal end of a sheath 35 and a pivot pin 37 fixed to the sleeve 36 so as to be openable and closable. -A pair of biopsy cups 38 protruding from the sleeve 36
a, 38b. The base ends of the biopsy cups 38a, 38b are linked to the link plates 40a, 4 by pins 39a, 39b.
0b is attached to one end of the link plates 40a, 40
The other end of b is fixed to the connecting member 43 by the pin 41,
The connecting member 42 is fixed to the distal end of the operation wire 34 inside the sheath 35. Therefore, the biopsy cups 38a and 38b can be opened and closed by pushing and pulling the operation wire 34. In the illustrated example, the biopsy cups 38a and 38b are attached as the treatment section 32,
This can be a variety of forceps, such as grasping forceps, high frequency snares, high frequency knives, brushes and the like.

As shown in FIG. 27, the operating portion 33 formed on the proximal side of the sheath 35 includes an operating portion main body 43 fixed to the rear end of the sheath 35, and the operating portion main body 43 includes the shaft portion 4.
4 and a finger hook ring 45 attached to the rear end of the shaft portion 44. A hollow slider 46 is loosely fitted in the shaft portion 44 and is slidable in the front-rear direction along the shaft portion 44. The proximal end side of the operation wire 34 that is inserted through the sheath 35 is attached to the slider 46.

In the treatment instrument 31 having the above structure, the thumb is inserted into the finger hook ring 45 of the operation portion 33, the slider 46 is sandwiched between the index finger and the middle finger, and the shaft portion 44 and the slider 46 are moved relatively to each other. Push and pull the wire 44,
The forceps cups 38a and 38b of the treatment section 32 can be opened and closed.

The sheath 35 surrounding the operation wire 34 is soft so that the distal end side can be bent, and is relatively hard at other portions, and the hardness of the sheath 35 is changed so that it is elastic.
In order to configure the sheaths 35 having different hardness, the operation portion 33
Hand coil sheath 4 consisting of a relatively stiff multi-strand coil on the side
7, a distal coil sheath 48 made of a flexible single-strand coil having small rigidity on the treatment portion 32 side of the distal end, and a hand coil sheath 4
7 between the coil sheath 4 and the tip coil sheath 48
An intermediate coil sheath 49 composed of a single-strand coil having an intermediate hardness of 7, 48 is arranged, and each is connected by connecting pipes 50, 51.

An example of the invention of the sheath 35 whose hardness changes from the side of the treatment portion 32 to the side of the operation portion 33 as described above is, for example, Japanese Patent Application Laid-Open No. 3-47246 previously proposed by the present applicant.
There is an invention described in the publication. Although the above-mentioned invention does not describe in detail the connecting structure of the multi-strand coil sheath constituting the proximal coil sheath 47 and the single-strand coil sheath constituting the intermediate coil sheath 49 by the connecting pipe 50,
Actually it was as follows. (The hand coil sheath 47 and the multi-strand coil sheath are the same member, but when they are present as parts, they are referred to as the multi-strand coil sheath, and when assembled into a treatment tool, they are referred to as the hand coil sheath 47 for distinction for description. Intermediate coil sheath 49 The same shall apply to the single-strand coil sheath.)

The multi-strand coil sheath 52 and the single-strand coil sheath 53 are cut into a predetermined length, and their end faces are processed into a structure that can be connected by a connecting pipe 50. Specifically, FIG.
~ Right angle end face machining as shown in Fig. 31 and Fig. 32 ~
After the stepped end surface processing as shown in FIG. 34 is performed,
They were connected by the connecting pipe 50. 29 and 32, the end face shape of the multi-strand coil sheath 52 is shown, and in FIGS. 30 and 33, the end face shape of the single-strand coil sheath 53 is shown.
4 shows a state in which they are connected by a connecting pipe 50.

However, in the multi-strand coil sheath 52, since the coil is formed by a plurality of strands, the strands of the multi-strand coil sheath are likely to come apart during end face processing.
As shown in FIG. 5, the vicinity of the planned end surface processing line 54 indicated by the broken line was hardened with silver solder 55 to form a hard portion, and then the end surface processing was performed as shown in FIG.

[0010]

However, in the invention described in the above-mentioned Japanese Patent Laid-Open No. 3-47246, when a hard portion is formed by silver brazing in the vicinity of the end surface processing planned line of the multi-row coil sheath, the multi-row silver brazing wire is used. The inner diameter of the multi-strand coil sheath becomes narrower due to the flow into the coil sheath, and the operation wire that is inserted into the multi-strand coil sheath cannot be inserted when it is assembled into the treatment instrument for endoscopes, or the distal end treatment is required after assembly. There has been a problem that the amount of operating power for operating the section becomes large.

Moreover, since the flux is used as the antioxidant, sufficient washing with hot water or the like is indispensable for an endoscopic treatment instrument to be inserted into a human body and used. Therefore, a lot of man-hours were required. Furthermore, since heating is performed by a burner, the multi-strand coil sheath is annealed, which may cause loss of original toughness. In addition, since the brazing work itself is difficult and requires skill, it is difficult to standardize the processing, and the quality varies greatly.

Therefore, the present invention was developed in view of the above problems in the prior art, and solves the above problems.
An object of the present invention is to provide a treatment tool for an endoscope, which is safe in hygiene and stable in quality, while reducing the number of man-hours required to process the end face of a multi-strand coil sheath.

[0013]

According to the present invention, there is provided an endoscopic treatment instrument having a coil sheath having a treatment section attached to a distal end thereof, and at least a part of the coil sheath being constituted by a multi-row coil sheath. The strip coil sheath is formed by welding adjacent wires to each other to form a hard portion, and processing the end face in the vicinity of the welding portion.

[0014]

In the present invention, since the end face processed portion of the multi-strand coil sheath is welded without using silver brazing or the like as a means for making it hard, the inner diameter of the multi-strand coil sheath does not change.
Since it does not affect the operation of the operation wire incorporated therein, it is possible to provide a treatment instrument for an endoscope with a stable operation force amount.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the endoscopic treatment tool according to the present invention will be described below in detail with reference to the drawings.

[0016]

Embodiment 1 FIGS. 1 to 3 are side views showing the present embodiment. Reference numeral 1 denotes a multi-strand coil sheath, which is a 4-strand coil sheath composed of four strands. The broken line is the planned end surface processing line 2, and the description will be made assuming that the multi-strand coil sheath 1 required here is on the left side of the planned end surface processing line 2.

Laser light 3 (other than laser light is omitted in the drawing) irradiates the end surface processing planned line 2 on the outer peripheral surface of the multi-strand coil sheath 1 to weld the adjacent strands and strands of the multi-strand coil sheath 1. Then, the welded portion 4 is formed. The laser-welded multi-strand coil sheath 1 is end-face processed along a planned end-face processing line 2. Fig. 1 shows a multi-strand coil sheath 1 before end face processing,
FIG. 2 shows a multi-strand coil sheath 1 welded on a planned end face 2 by a laser beam 3, and FIG. 3 shows a multi-strand coil sheath 1 end-face processed. The multi-strand coil sheath 1 whose end face is processed as described above is connected to the single-strand coil sheath by the connecting pipe as in the above-described conventional technique, and constitutes a treatment instrument for an endoscope.

According to this embodiment, an endoscopic treatment instrument in which the inner diameter of the multi-coil sheath does not change and the operating force of the operation wire is stable can be obtained.

In this embodiment, the multi-strand coil sheath composed of four strands has been described, but the number of strands is not limited to four, and a multi-strand coil sheath consisting of two or more strands may be used. In addition, although the case of laser welding is shown as the means of welding in the present embodiment, a welding method such as electron beam welding or plasma welding may be used as long as adjacent wires can be welded.

As a modification, in the present embodiment, the welded portion 4 is formed on the end face processing planned line 2 by irradiating the laser beam 3. However, if the strands are not scattered during the end face processing, the welded portion 4 is formed at other positions. May be formed. FIGS. 4 to 5 show a multi-strand coil sheath 1 in which a welded portion 4 is formed by welding slightly to the left of the planned end face processing line 2 on the outer peripheral surface of the multi-strand coil sheath 1.
FIG. 5 shows a multi-strand coil sheath 1 in which the end surface is processed.
Is.

Further, FIG. 6 shows a multi-strand coil sheath 1 in which a welded portion 4 is formed on the end face processing planned line 2 of the multi-strand coil sheath 1 and slightly to the left side thereof, and FIG. 7 shows it. It is a processed multi-strand coil sheath 1. Welding part 4
By forming the double layer, it is possible to more reliably prevent the wires from coming loose.

Further, the present embodiment is applicable not only to the right-angled end surface processing but also to the stepped processing. 8 and 9 show the case where the welded portion 4 is formed at the tip position of the planned end surface processing line 2, FIG.
11 shows the case where the welded portion 4 is formed slightly to the left of the tip position of the planned end surface processing line 2, and FIGS. 12 and 13 show the tip position on the planned end surface processing line 2 and the welded portion 4 slightly left thereof. 3 shows a multi-strand coil sheath 1 in the case of forming a. FIG. 8, FIG. 10 and FIG. 12 respectively show the state of the formed welded portion 4 and the end face processing planned line 2,
FIG. 9, FIG. 11 and FIG. 13 show the end face state after the stepped end face processing.

Further, in this embodiment, a right-angled end surface is processed,
Although the stepped machining of the outer diameter is shown, it can be applied to other outer diameter taper processing and inner diameter boring processing.

Further, although the connection of the multi-strand coil sheath and the single-strand coil sheath has been described in the present embodiment, the invention is not limited to this, and the multi-strand coil sheath and the multi-strand coil sheath are coupled, or the multi-strand coil sheath and the metal part are coupled. It is also applicable to the case where the end face processing of the multi-strand coil sheath is required.

[0025]

Second Embodiment FIGS. 14 to 16 are side views showing the present embodiment. In the first embodiment, the hard portion is formed by continuously welding the outer circumference of the multi-strand coil sheath, but in the present embodiment, the hard portion is formed by spot welding at several points. Similar to the first embodiment, 1 is a multi-strand coil sheath, and a broken line is a planned end face processing line 2. The description will be given assuming that the multi-strand coil sheath 1 which is also required here is on the left side of the planned end face processing line 2.

On the end face machining line 2 on the outer peripheral surface of the multi-strand coil sheath 1, several points spot welding is performed by laser light 3 (other than laser light is omitted) to form a welded portion 4, and the multi-strand coil sheath 1 is adjacent to the multi-strand coil sheath 1. The wires to be welded are welded to each other. Laser welded multi-strand coil sheath 1 has a planned end surface processing line 2
The end face is processed along with it. 14 shows a multi-strand coil sheath before end face processing, FIG. 15 shows a multi-strand coil sheath spot welded by a laser beam 3, and FIG.

According to this embodiment, since the hard portion is formed by spot welding at several points, the amount of heat input is smaller than that in the first embodiment in which continuous welding is performed. It is possible to prevent deterioration of the toughness of the linear coil sheath. Further, since the spot welding is performed at several points, the time required to form the hard portion can be shortened.

In this embodiment, spot welding was carried out at several points on the planned end face processing line 2 with the laser beam 3. However, as in the case of the first embodiment, if the strands do not come apart during the end face processing,
You may form a hard part by spot-welding to another position. FIG. 17 shows the multiple-strand coil sheath 1 spot-welded slightly to the left of the planned end-face processing line 2, and FIG. 18 shows the multiple-strand coil sheath 1 end-processed.
Further, FIG. 19 shows a multi-strand coil sheath 1 which is spot-welded on the end face processing planned line 2 and further slightly to the left of it, and FIG. 20 shows a multi-strand coil sheath 1 which is end face processed.

Further, as in the first embodiment, the present invention can be applied not only to the right-angled end surface processing but also to the step processing. 21 and 2
No. 2 is spot welded to the tip position of the planned end surface processing line 2, FIGS. 23 and 24 are spot welded to the left side slightly from the tip position of the planned end surface processing line 2, FIGS.
Shows the position of the tip on the planned end face processing line 2 and the multi-strand coil sheath 1 spot-welded slightly to the left of the position. 21, FIG. 23, and FIG. 25 respectively show the state of spot welding and the planned end surface processing line 2,
22, 24, and 26 show the end face state after the stepped end face processing.

[0030]

As described above, according to the treatment tool for an endoscope of the present invention, the inner diameter of the multi-strand coil sheath that affects the operation of the operation wire incorporated in the multi-strand coil sheath is set. There is no change and an endoscopic treatment tool with a stable actuation force is obtained. Also, since no flux is used,
It is hygienic and safe, and does not require a cleaning process, which can significantly reduce the number of work steps. Further, since the welding is performed by local heating and melting such as laser welding, the thermal effect is small, and there is no fear of deterioration of the toughness of the multi-strand coil sheath. Further, the processing quality is stable, and the effect that does not require the skill of the operator can be obtained.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment.

FIG. 2 is a side view showing the first embodiment.

FIG. 3 is a side view showing the first embodiment.

FIG. 4 is a side view showing a modified example of the first embodiment.

FIG. 5 is a side view showing a modified example of the first embodiment.

FIG. 6 is a side view showing a modified example of the first embodiment.

FIG. 7 is a side view showing a modified example of the first embodiment.

FIG. 8 is a side view showing a modified example of the first embodiment.

FIG. 9 is a side view showing a modified example of the first embodiment.

FIG. 10 is a side view showing a modified example of the first embodiment.

FIG. 11 is a side view showing a modified example of the first embodiment.

FIG. 12 is a side view showing a modified example of the first embodiment.

FIG. 13 is a side view showing a modified example of the first embodiment.

FIG. 14 is a side view showing a second embodiment.

FIG. 15 is a side view showing a second embodiment.

FIG. 16 is a side view showing a second embodiment.

FIG. 17 is a side view showing a modified example of the second embodiment.

FIG. 18 is a side view showing a modified example of the second embodiment.

FIG. 19 is a side view showing a modified example of the second embodiment.

FIG. 20 is a side view showing a modified example of the second embodiment.

FIG. 21 is a side view showing a modified example of the second embodiment.

FIG. 22 is a side view showing a modified example of the second embodiment.

FIG. 23 is a side view showing a modified example of the second embodiment.

FIG. 24 is a side view showing a modified example of the second embodiment.

FIG. 25 is a side view showing a modified example of the second embodiment.

FIG. 26 is a side view showing a modified example of the second embodiment.

FIG. 27 is a side view showing a conventional example with some parts omitted.

FIG. 28 is a partial cross-sectional view showing a conventional example.

FIG. 29 is a side view showing a conventional example.

FIG. 30 is a side view showing a conventional example.

FIG. 31 is a side view showing a conventional example.

FIG. 32 is a side view showing a conventional example.

FIG. 33 is a side view showing a conventional example.

FIG. 34 is a side view showing a conventional example.

FIG. 35 is a side view showing a conventional example.

FIG. 36 is a side view showing a conventional example.

[Explanation of symbols]

 1 Multi-threaded coil sheath 2 Planed end face processing line 3 Laser beam 4 Weld

Claims (1)

[Claims] 1. A treatment instrument for an endoscope, which has a coil sheath having a treatment portion attached to a distal end thereof, and at least a part of the coil sheath is constituted by a multi-strand coil sheath, wherein the multi-strand coil sheath is provided with an adjacent strand. A treatment tool for an endoscope, characterized in that a hard portion is formed by welding with a wire and an end face is processed in the vicinity of the welding portion.