JPH1189850A - Production of cup-like collecting blade body for procedure part of procedure tool for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the hooking of the rugged parts at both edges of cup-like collecting blade bodies by the penetration thereof into the tissue and to make it possible to surely taken out the tissue by molding these blade bodies before edging through a sintering treatment, then subjecting the edges of cup blades to an electrolytic polishing treatment, thereby edging the blade bodies. SOLUTION: A procedure part formed by supporting the cup-like collecting blade bodies 6, 7 via opening/closing link mechanisms 8 to a pair of connecting links 5b is mounted at the front end of a cord-like connecting member 2 which is drawn out of an operation section and is inserted into the body via an endoscope. The production of such collecting blade bodies 6, 7 is executed by first forming the cup-like collecting blade bodies 6, 7 having a three-dimensional shape by a metallic powder injection molding treatment and sintering treatment. The edges 23 of the cup blades 19, 20 are then subjected to the electrolytic polishing treatment to dissolve the surfaces of the edges 23 and are finished sharp. At this time, the irregular and shallow ruggedness shapes are formed by the dissolution of the metallic powder particles. The rugged parts are easily penetrated into the tissue.

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 an operation, a medical examination, or the like, in which a treatment portion provided at a distal end portion of an interlocking member inserted into a body through an endoscope is used. The present invention relates to a method of manufacturing a pair of cup-shaped sampling blades that are supported so as to be capable of opening and closing.

[0002]

2. Description of the Related Art Conventionally, a cup-shaped sampling blade has been machined to form a prototype of the cup-shaped sampling blade and to sharpen the edge of the cup blade so as to sharpen the blade. Had been manufactured.

[0003]

However, since it is a machined product, as shown schematically in FIG. 4 (b), the tip 23a of the cutting edge 23 is linearly extended to maintain sharpness. I have. Therefore, when the cup-shaped sampling blades are closed with each other, and the tissue is cut by the cutting edges 23 into the cup-shaped blades, the tips 23a of the cutting edges 23 are unlikely to enter the tissue, and the tissue can be reliably removed. There was a risk of disappearing.

SUMMARY OF THE INVENTION An object of the present invention is to make it easy to insert both cutting edges into a tissue, and to reliably remove the tissue.

[0005]

The present invention will be described with reference to the reference numerals in the drawings (FIGS. 1 to 5) of the following embodiments. Claim 1
The present invention provides a treatment tool for an endoscope in which a treatment section (3) provided at a distal end of an interlocking member (2) inserted into a body via an endoscope is remotely operated by an operation section (1). In
In a method of manufacturing a pair of cup-shaped sampling blades (6, 7) that are supported by the treatment section (3) so as to be able to open and close with each other,
A step (A) of forming a cup-shaped sampling blade body (6, 7) before cutting with a sintering process (AS), and a cup-shaped sampling blade (6, 6) before cutting in this forming step (A). A step (B) of performing electropolishing (BE) on the cutting edge (23) of the cup blade (19, 20) provided in 7) to perform blade cutting.

According to a second aspect of the present invention, in the molding step (A) according to the first aspect of the present invention, a metal powder injection molding process (A
E) and a subsequent sintering process (AS).

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG. <Outline of Endoscope Treatment Tool> As shown in FIG. 1A, a cord-shaped interlocking member 2 pulled out of an operation unit 1 is inserted into a body through an endoscope (not shown). That
The treatment section 3 is attached to the tip of the interlocking member 2. In the treatment section 3, FIGS. 1B and 2
(A) As shown in (b), both arm-shaped connecting links 5a and 5b are attached to the tip of the outer peripheral protection coil 4 of the interlocking member 2, and both cup-shaped connecting links 5a and 5b are attached to the two connecting links 5a and 5b. The sampling blades 6 and 7 are supported via an opening / closing link mechanism 8. In this opening / closing link mechanism 8, the levers 9, 10 of the sampling blades 6, 7 are connected between the arm-shaped connecting links 5a, 5b.
Are rotatably supported by a fixed central shaft 11, and connecting links 12, 13 are respectively provided at the distal ends of the levers 9, 10.
Are connected rotatably by permanent center shafts 14 and 15, and the distal ends of the connecting links 12 and 13 are rotatably connected by a permanent center shaft 16. The distal end of an operation wire 17 in the interlocking member 2 is attached to the permanent center shaft 16 by a connection link 18.

When the operating wire 1 is pulled by remote control using the operating unit 1, the permanent center axis 16 is separated from the fixed center axis 11 in the opening / closing link mechanism 8, and the two sampling blades 6, 7 are closed. Contact. When the operation wire 17 is pressed remotely by the operation unit 1 and the operation wire 17 is pushed, the return force of the protection coil 4 is also applied thereto, and the permanent center axis 16 approaches the fixed center axis 11 in the opening / closing link mechanism 8, and The sampling blades 6, 7 open and move away from each other.

<Details of Each of the Sampling Blades 6 and 7 shown in FIGS. 1, 2 and 3>
The levers 9 and 20 and the levers 9 and 10 are integrally formed by a manufacturing method described later. By the way,
The maximum length of the sampling blades 6 and 7 is 2 to 10 mm.

[0010] The cup blades 19 and 20 are
And a housing recess 22 surrounded by the recess, and a cutting edge 23 formed at an open edge of the bowl-shaped wall 21. The bottom of the bowl-shaped wall 21 is provided with a through hole 24 penetrating inside and outside.

The levers 9 and 10 are provided with cup blades 19 and 2
0, it is integrally and continuously extended on one side of the bowl-shaped wall 21 and includes a thick portion 25 on the base end side and a thin portion 26 on the front end side, with a step 27 between them. doing. A support hole 28 into which the fixed central shaft 11 is inserted is formed in the thick portion 25.
Is provided. The thin portion 26 is provided with a support hole 29 into which the permanent center shafts 14 and 15 are inserted.

<Outline of Method of Manufacturing the Sampling Blades 6 and 7>
As shown in FIG. 5, this manufacturing method roughly includes a forming step A and a cutting step B performed thereafter.

* Molding step A: As raw materials, a metal powder and a binder made of a resin or the like are prepared.・ Knead the raw materials to make special pellets.

The special pellets are supplied to an injection molding machine and subjected to a metal powder injection molding process AE, and injection molding of cup-shaped sampling blades 6 and 7 is performed. After the metal powder injection molding AE, the original shapes of the cup-shaped sampling blades 6 and 7 are supplied to a degreasing furnace to be degreased.

After the degreasing, the cup-shaped sampling blade 6,
The original product of No. 7 is supplied to a sintering furnace and subjected to a sintering process AS, and the cup-shaped sampling blades 6 and 7 before cutting are sintered and formed. These cup-shaped sampling blades 6 and 7 have cup blades 19 before cutting,
20 are provided.

* The blade-attaching step B ・ The cup-shaped sampling blades 6, 7 formed by sintering in the molding step A are washed. The cup-shaped sampling blades 6 and 7 are placed in an electrolytic bath, and the blades 23 of the cup blades 19 and 20 before the blades are subjected to electrolytic polishing BE to perform the blade sharpening.

The cup-shaped sampling blades 6 and 7 that have been subjected to the electropolishing BE are washed. [Features of the present embodiment] The present embodiment has the following features *.

* By the metal powder injection molding (MIM) treatment AE and the sintering treatment AS in the molding step A, the cup-shaped sampling blades 6 and 7 having a small and complicated three-dimensional shape are formed.
It can be mass-produced easily, inexpensively and precisely.

* Cup-shaped sampling blade 6, which is a sintered product
In 7, innumerable small independent holes are uniformly dispersed.
However, the cup blade 1 in a state where the sintering process AS is performed is performed.
Since the cutting edges 23 of 9, 20 are not sharp enough, they have poor sharpness. Therefore, the electropolishing BE in the blade attaching step B is performed by using the edge 23 of the cup blades 19 and 20.
It was applied to. By this electropolishing BE, the cup blade 1
The surfaces of the 9, 23 cutting edges 23 are melted and become sharp.

Moreover, since the object to be subjected to the electropolishing BE is a sintered product, as shown schematically in FIG. 4 (a), it extends substantially annularly at the cutting edge 23 of the cup blades 19, 20. The tip 23a has irregular and shallow irregularities due to melting of the metal powder particles while maintaining sharpness. Accordingly, when the cup-shaped sampling blades 6 and 7 are closed to each other and the tissue is cut by the cutting edges 23 and put into the cup edges 19 and 20, the uneven portions of the tips 23 a of the cutting edges 23 are hardly inserted into the tissue. It becomes easy to catch and the tissue can be taken out reliably. In addition, a so-called pull-off function also occurs on the slope formed on the uneven portion of the point 23a, thereby improving sharpness.

[0021]

According to the method of manufacturing the cup-shaped sampling blade for the treatment section of the treatment tool for an endoscope according to the first aspect of the present invention, the cutting edge (23) of the cup blade (19, 20) is sharp. The metal powder particles are melted to form irregular and shallow irregularities while holding the cutting edge. Therefore, when the tissue is cut by the two cutting edges (23), the irregularities of the two cutting edges (23) are hardened into the tissue and pulled. It becomes easy to hang, and the tissue can be taken out reliably.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the metal powder injection molding process (AE) allows
Small and complex three-dimensional cup-shaped sampling blade (6,
7) can be easily, inexpensively, and precisely mass-produced.

[Brief description of the drawings]

FIG. 1A is a partially cutaway front view showing an entire endoscope treatment tool according to an embodiment, and FIG. 1B is a partially enlarged front view of FIG. 1A showing a treatment section. .

2 (a) is a partially enlarged front sectional view showing the treatment section of FIG. 1 (b), and FIG. 2 (b) is a partially enlarged side sectional view showing the treatment section of FIG. 1 (b).

3A is a plan view showing a finished product of the cup-shaped sampling blade according to the present embodiment, FIG. 3B is a front view thereof, and FIG. 3C is an XX line of FIG. It is sectional drawing.

FIG. 4 (a) is a partially enlarged perspective view schematically showing the tip of the cup-shaped sampling blade according to the present embodiment,
(B) is a partial enlarged perspective view schematically showing the tip of the conventional cup-shaped sampling blade.

FIG. 5 is a process chart schematically showing a method of manufacturing the cup-shaped sampling blade according to the present embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Operation part, 2 ... Interlocking member, 3 ... Treatment part, 6, 7 ... Cup-shaped sampling blade, 19, 20 ... Cup blade, 23 ... Blade edge, A
... molding step, AE ... metal powder injection molding processing, AS ... sintering processing, B ... blade cutting step, BE ... electrolytic polishing processing.

Claims (2)

[Claims] 1. A treatment tool for an endoscope which is operated by remotely operating a treatment portion provided at a distal end portion of an interlocking member inserted into a body via an endoscope by an operation portion. In a method of manufacturing a pair of cup-shaped sampling blades that are supported so as to be able to open and close with each other, a step of forming a cup-shaped sampling blade before cutting through a sintering process; A step of performing electropolishing on the cutting edge of the cup blade provided on the sampling blade to perform blade sharpening, and a method of manufacturing a cup-shaped sampling blade for a treatment section in a treatment tool for an endoscope. . 2. The molding step includes a metal powder injection molding process,
The method for producing a cup-shaped sampling blade for a treatment section of the treatment tool for an endoscope according to claim 1, further comprising a sintering process performed thereafter.