JPS639862B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an endoscopic forceps device and a method for manufacturing the same.

Prior Art A conventional endoscopic forceps device generally has a configuration as shown in FIG.

That is, a flexible tube 2 that can be inserted into the endoscope insertion channel 1, an operating section 3 that connects one end 2a of the flexible tube 2, and a , an operating wire 8 connected to one operating arm 3a of the operating section 3, and a cutting blade section connected to the other end 8b of the operating wire 8 via a connecting section 6 and cutting tissue etc. on the front side thereof. 5, and a pair of forceps 4, 4.

Note that 3b in the figure indicates the other operating arm of the operating section 3 to which one end 2a of the flexible tube 2 is connected.

Thus, the pair of forceps 4, 4 that are connected at the connecting portion 6 are connected by a connecting piece 6 that is itself curved and formed from an elastic material (for example, stainless steel).
Due to the elasticity of c, the cutting blades 5, 5 are always urged toward each other in the opening direction with the connecting portion 6 as a fulcrum.

Therefore, as shown in Figs. 1 and 2, the usual forceps 4,
4 is an operating wire 8 connected via a connecting portion 6 between the two, which is pushed forward in the flexible tube 2 when the operating portion 3 is not operated, and its end 8b is connected to the flexible tube 2.
When both are located on the open end 2b side of the flexible tube 2
The front cutting blades 5, 5 are held in the open state by the elastic action of the connecting pieces 6c, 6c while protruding from the open end 2b.

On the other hand, in the operating section 3, when the operating arm 3a is rotated about the pivot pin 7 with the other operating arm 3b, the operating wire 8 is pulled backward, and both forceps 4, 4 is the open end 2 of the flexible tube 2
The outer periphery of the spherical parts 4a, 4a on the opposite side to the cutting edge 5 is guided by the taper 2c of the inner periphery of the open end 2b, and the cutting edge 5, 5 of both forceps 4, 4 is pulled into the forceps 4, 4. are in a closed state in which they mesh with each other against the elastic force of the connecting pieces 6c, 6c.

Due to the engagement of the cutting blades 5, 5 of the forceps 4, 4,
Tissue etc. are collected at a desired position, and this state is shown in FIG.

Now, as shown in FIG. 4a, the pair of forceps 4, 4 of the forceps device having such a configuration are made of an elastic material, for example, stainless steel, and each has a cutting edge 5 on the edge side of the opening. A pair of forceps 4, 4 are integrally formed with a connecting portion 6a having a semicircular cross section on the rear side of the forceps 4 via the curved connecting pieces 6c, 6c, and are each formed separately.
facing each other and connecting portions 6 having a semicircular cross section.
After holding the opening edges 6b, 6b of a, 6a in a butt state, both opening edges 6b, 6b are brazed 9 to form a connecting portion 6 having a semicircular cross section.
A connecting part 6 having a cylindrical cross section by joining a and 6a
At the same time, both forceps 4 and 4 were connected.

However, the cutting blades 5, 5 of the forceps 4, 4 are required to function as sharp blades that can accurately cut tissue, etc., and to have durability that can prevent the same function from diminishing due to repeated use. In order to achieve this, the heat treatment of quenching is performed, and the brazing temperature of the brazing process performed when joining the connecting portion 6a is 700 to 1000°C. Since the temperatures are the same, it became necessary to perform the heat treatment and brazing process at the same time.

That is, it is possible to perform the brazing process alone while heating only the connecting portion 6a, which is the brazing part, but heating locally is
This has the drawback of impairing the uniformity of the properties of the molding material and causing the forceps 4 to break, crack, etc.

In addition, in the brazing process, the flowed wax adheres to the outer periphery of the forceps 4, so a work step is required to remove it. As mentioned above, even when brazing the connecting portion 6a, the two cutting edges 5, 5 are positioned and held in the meshing state. However, due to the slight difference in thermal expansion between the forceps 4, 4 due to the brazing temperature, the engagement state of the cutting blades 5, 5 after the forceps 4, 4 are joined may vary. There was a need for a corrective work process.

Furthermore, during the brazing process, as shown in FIG.
b, 6b, 0.01 to 0.1 from the center line A between them.
If brazing is not performed after removing the brazing margin such as mm, the cross-sectional shape of the cylindrical connecting portion 6 formed by the two connecting portions 6a, 6a will not be a perfect circle but will be elliptical. When processing the opening edges 6b, 6b of the two connecting parts 6a, 6a, it is required to set a brazing margin of the required size, and at the same time, it is necessary to set the brazing margin of the required size. However, the roundness of the roundness tends to be often impaired.

In FIG. 4a, 6c is the cutting edge 5 of the forceps 4.
It is a connecting piece that connects the side and rear connecting parts 6b, and is formed in a curved manner so as to always urge the front cutting edge 5 side in the opening direction. Further, 6d indicates a connecting end with the operating wire 8 protruding from the rear end of the connecting portion 6a.

Purpose Therefore, the present invention eliminates the various drawbacks of the manufacturing method of the conventional endoscope forceps device, simplifies the number of manufacturing steps of this seed forceps device, and uniformizes and improves the product accuracy. The object of the present invention is to provide an endoscopic forceps device that is excellent in quality and durable.

Overview The present invention provides the following steps when connecting a pair of forceps in an endoscopic forceps device so as to be openable and closable at a connecting portion.
After holding the cutting blades provided on the front sides of both forceps in an engaged state and abutting the edges of both openings, which do not have weld margins, of the connecting portions with a hemispherical cross section provided on the rear sides of both forceps, Laser welding the abutting portions of the edges of both openings along the length direction of both connecting portions enables local welding work at the connecting portion, and connects both connecting portions via this laser welded portion. Thus, a pair of forceps are connected by a connecting part on the rear side and a cutting edge part on the front side so as to be openable and closable.

EXAMPLE Hereinafter, a method for connecting endoscopic forceps in the endoscopic forceps device of the present invention will be specifically explained together with the illustrated endoscopic forceps device.

(First Embodiment) Now, FIG. 5 is a partially sectional side view showing a method of joining the endoscopic forceps of the present invention.

Therefore, the configuration is the same as that shown in FIG. 4 (however, the connecting portion 6a does not have a welding margin as described later), and a pair of forceps 4, 4, which are formed separately, are opposed to each other, and a fifth As shown in the figure, the connecting parts 6a, 6a on the rear side of both forceps 4, 4,
The spherical portions 4 of both forceps 4 are inserted into the insertion hole 10a of the positioning gear 10 while abutting the opening edges 6b, 6b, and the spherical portions 4 of both forceps 4
After holding the front cutting edges 5, 5 of both forceps 4, 4 in a mutually meshed state by fitting a, 4a,
Laser light is irradiated from the laser device 11 along the length direction of the connecting portions 6a, 6a on the opening edges 6b, 6b of the connecting portions 6a, 6a that are butted against each other on the rear sides of the forceps 4, 4. Weld according to No. 12.

Further, one opening edge 6b, 6b of both connecting portions 6a, 6a shown in FIG. By welding 6b as well, it is possible to integrally connect both connecting portions 6a, 6a with a semicircular cross section at both welded portions 13, 14, and form a cylindrical connecting portion 6 with a perfect circle in cross section. At the same time, the front cutting blades 5, 5 are connected to the connecting pieces 6c,
Both forceps 4, 4 are always urged in the opening direction by 6c.
can be connected while being connected at the same connecting part.

Thereafter, as shown in FIG.
d into one end 8a of the operating wire 8, and after holding both end surfaces in a state of abutting each other, while irradiating the abutting portion of both with the laser beam 12 of the laser device 11 along the circumferential direction. The endoscopic forceps device shown in FIG. 1 can be formed by welding and connecting, and then arranging the configuration of each part according to the configuration shown in FIG.

Further, in forming each of the forceps 4, 4 shown in the fourth figure, the method is similar to that of forming the forceps 4, 4 shown in the fourth figure, but in particular, the connecting portion 6
In forming the parts a and 6a, the joining by the brazing part 9 as shown in FIG. , both connecting parts 6 from the end
By abutting the opening edges 6b, 6b of the openings 6a and 6a, it is possible to form a cylinder having a perfect circular cross-sectional shape.

Furthermore, the type of laser of the laser device 11 is not particularly limited;
It can be carried out using YAG, carbon dioxide, ruby, or other various lasers, and the welding state may be either a seam or a spot. , 6a may be moved, or conversely, the laser device 11 may be moved to the connecting portions 6a, 6a.
It can also be carried out while moving along the length direction of a, and the connecting portion 6 and the operating wire 8 shown in FIG.
Welding can also be carried out using a similar method.

Effects of the Invention As is clear from the above description, according to the present invention, the opening edges of the rear connecting portions of a pair of forceps with no welding margins are laser welded while abutting each other, and the connecting portions are laser welded. Compared to a conventional manufacturing method of an endoscopic forceps device using brazing by connecting the pair of forceps through a portion, and an endoscopic forceps device having a brazing portion formed by the same method, the following is achieved. It has the following effects.

(1) Due to local processing by laser welding, the cutting edge of the forceps is hardened and heat treated, and the curved connecting pieces that require spring properties are made of material because the heat during welding is not transmitted. A stable forceps device can be provided.

(2) By joining by laser welding and joining through laser welded parts, it is possible to provide a stable forceps device with high circularity of the connected parts, which does not require brazing.

(3) A work process to remove wax that adheres to the forceps due to wax flowing out during brazing, or a process to process the brazing white required for the connection part, and a correction process for the roundness of the connection part. The process etc. can be made unnecessary by the above-mentioned joining by laser welding and joining via the laser welding part, and the number of man-hours can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a conventional endoscopic forceps device, and FIGS. 2 and 3 are partial cross-sectional views showing the open and closed states of the forceps in the same device.
Figure 4a is an explanatory diagram showing the manufacturing method of the device;
Figure b is a partially enlarged sectional view of the brazed part in the connecting part, Figure 5 is a partially longitudinal side view showing the endoscopic forceps device of the present invention and its manufacturing method, and Figure 6 is a partially enlarged sectional view of the connecting part. The enlarged sectional view and FIG. 7 are partial side views showing a method of connecting the connecting portion and the operating wire. 1... Endoscope insertion channel, 2... Flexible tube, 3... Operating section, 4... Forceps, 5... Cutting blade section,
6... Connecting portion, 6a... Connecting portion having a hemispherical cross section, 6
b...Opening edge, 6c...Connecting piece, 7...Pivot pin, 8...Operation wire, 9...Brazing portion, 1
0...Positioning Yatoi, 11...Laser device,
12... Laser light, 13, 14... Welding part.

Claims (1)

[Scope of Claims] 1. A method for manufacturing an endoscopic forceps device, comprising: positioning the cutting blades of a pair of forceps so that they mesh with each other; and providing a connecting portion on the rear side of the cutting blades of the pair of forceps. , characterized in that the opening edges having no weld margins are positioned while butting against each other, and then the opening edges that are joined to each other are laser welded along the length direction of the connecting part. A method for manufacturing an endoscopic forceps device. 2. An endoscopic forceps device comprising a forceps having a pair of cutting blades that can engage with each other and a connecting part having a laser welding part that connects the forceps with the pair of cutting blades to each other. Device. 3. The laser welded portion is provided with a connecting portion having a semicircular cross section integrally formed on the rear side of the pair of forceps, respectively, along the length direction of the opening edge thereof. Endoscopic forceps device described in Section 1. 4. The endoscopic forceps device according to claim 2, wherein the connecting portion having the laser welded portion is connected to an end portion of the operating wire in the endoscopic forceps device via the laser welded portion. . 5. The endoscopic forceps according to claim 2, wherein the connecting portion having the laser welded portion is a cylindrical portion having a perfectly circular cross section.