JPH021498B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an endoscopic forceps device.

PRIOR TECHNOLOGY Generally, as shown in FIG. 1, an endoscope forceps device is inserted through a forceps port 3 provided in an operating section 2 of an endoscope 1, and is built into a connecting section 4 and a bending section 5 of an endoscope 1. In use, a pair of forceps 8 are projected from a forceps outlet 7 provided at the distal end portion 6 of the endoscope 1 through an insertion channel (not shown).

As shown in FIGS. 1 and 2, the forceps device 9 is provided with an operating section 11 at the proximal end 10a of a flexible tube 10 that can be inserted into the insertion channel of the endoscope 1, and at the distal end. A forceps head 12 is provided in the portion 10b, and a pair of forceps 8 are pivotally attached to the head 12 so as to be openable and closable.

Further, the pair of forceps 8 each have a connecting portion 8.
The operating wire 1 is inserted into the flexible tube 10 through the link 14 through the connecting piece 13 protruding from a.
It is connected to the operating wire 15 by being connected to a wire joint fitting 16 connected to the tip 15a of the wire.

Further, a rear end (not shown) of the operating wire 15 is connected to an operating rod 17 of the operating section 11.

Therefore, by moving the operating rod 17 of the operating section 11 back and forth, the operating wire 15 is moved into the flexible tube 1.
The pair of forceps 8 can be moved forward and backward in the middle of the
can be opened and closed using the pivot pin 19 of the forceps head 12 with the slotted opening cover 18 as a fulcrum.

As described above, the pair of forceps 8 in the endoscopic forceps device 9 having such a configuration connects the connecting pieces 13 protruding from the connecting portions 8a of both forceps 8 to the links 14, and connects the links 14 to the joint fittings. The operating wire 15 is connected via the forceps 16, and the connecting portions 8a of both forceps 8 are pivotally connected to a slotted opening cover 18 provided on the forceps head 12 so as to be openable and closable.

In addition, the method of connecting these parts will be explained below with reference to FIGS. 3a and 3b and 4 and 5.
means the connecting piece 13 of the forceps 8, as shown in FIG. 3a.
, the link 14 is connected to the joint part 13 of the connecting piece 13
The pivot pin 20 is inserted into both holes 13b, 14a while aligning the pivot holes 13b, 14a which are joined to the link 13 and the link 14 and connected to the connecting piece 13 and the link 14.

This pivot pin 20 connects the connecting piece 13 and the link 14.
The pivot pin 20 has a length l ₁ or longer between the pivot pins 20, and the head 20a fits into the fitting hole of the pivot hole 14a and is flush with the side surface of the link 14, but the open end 20b The side is inserted in such a manner that it protrudes from the side surface of the connecting piece 13.

Thereafter, the protruding open end 20b of the pivot pin 20 is caulked and plastically deformed.
The pivot pin 20 is attached between the connecting piece 13 and the link 14 via the caulking portion 20c (see FIG. 3b) of the pivot pin 20, and the pivot pin 20 rotatably connects the two. ing.

When connecting the link 14 to the connecting piece 13 of both forceps 8 using the pivot pin 20 in the same manner and then connecting it to the operating wire 15, as shown in FIG. Joint part 16 of joint fitting 16
a, and both links 14 and joint fittings 1.
After aligning the pivot holes 14b and 16a opened at 6, the pivot pin 21 is inserted into both holes 14b and 16a.

In this case, the pivot pin 21 is longer than the length l ₂ between the joint fitting 16 and both links 14 connected thereto, and the head 21a is fitted into the hole 14b so that the link 14 faces The open end protrudes from the surface of the other link 14, and is plastically deformed by caulking in the same manner as described above, and this caulking portion 21c connects the pivot pin 21 to both links 14. It can be attached between the joint fittings 16, and both links 14 can be pivotally connected to the joint fittings 16 at the same time.

Further, when both forceps 8, in which both links 14 are connected to the operating wire 15 via the joint fittings 16, are pivotally attached to the slotted opening cover 18 of the forceps head 12, the cover 18 is attached as shown in FIG. The connecting portions 8a of the forceps 8 are inserted into the slotted openings, and the links 14 connected to the connecting pieces 13 and the joint fittings 16 connected thereto are also inserted.

After that, both connecting parts 8a and the slotted opening cover 1 are connected.
While aligning the pivot holes 8b and 18a opened at 9, the pivot pin 22 is inserted into the holes 8b and 18a.

Similarly to the above, this pivot pin 22 has a length longer than the outer diameter l ₃ of the slotted opening cover 18.
2, the head 22a of which fits into the pivot hole 18a of the cover 18 and becomes flush with the side surface of the cover 18, or whose open end protrudes from the side surface of the cover 18, and whose protruding portion By crimping and plastically deforming the pivot pin 22, the crimped portion 22c
It is possible to attach the connecting portion 8a of both forceps 8 to the slotted opening cover 18 using the pin 22, and at the same time, both forceps 8 can be pivotally attached to the slotted opening cover 18 using the same pin 22.

Now, the way to connect each part is with the pivot pins 20, 2.
The caulking parts 20c, 21c, 22c of 1 and 22 are used to fix the crimping parts 20c, 21c, 22c.
c and 22c represent the connection piece 13 surface and link 1, respectively.
In order to make the 4th side and the 18th side of the slotted opening cover the same plane, shaping processing such as sanding is required, and the operating state of each pivot point is determined by the pivoting state of each pivot pin 20, 21, 22. However, it has disadvantages such as the need for adjustment between each part and the work to adjust for variations among processing workers.

Purpose Accordingly, the present invention aims to provide an endoscopic forceps device that can simplify the pivoting work of each part by the above-mentioned caulking work, and is configured with a pivoting part that is excellent in operating condition. It is.

Overview The endoscopic forceps device of the present invention includes a pair of openable and closable forceps attached to a link, or this link attached to an operating wire, and furthermore, a pivot pin attached to a connecting portion of a flexible tube. It is characterized in that it is constructed by being fixed by a welded part such as laser welding.

Embodiments Hereinafter, embodiments of the endoscopic forceps device of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 6 is a partially cutaway plan view showing a first embodiment of the present invention.

However, in the same figure, the connecting portion 8 of the forceps 8 is
In this embodiment, the connecting piece 13 and the link 14 of the forceps 8 are connected by a countersunk rivet-shaped pivot pin inserted into the pivot holes 13b and 14a of the forceps 8. (1st pivot pin)
The welding end portions 23c of 23 are connected to the connecting piece 13 by fixing the same pivot pin 23 through a welding portion 24 which is integrally welded to the connecting piece 13 by laser welding.

In addition, the pivot pin 23 is particularly connected to the connecting piece 1 of the forceps 8.
The link 14 joined to the joint part 13a of 3 and the plate thickness l ₁
Pivot pin 23 whose length does not exceed the sum of the lengths of
The head 23a of the pin body 23b is fitted into a cup-shaped fitting hole 14e formed on the side of the link 14 at the opening edge of the pivot hole 14a, and is welded to the same diameter as the pin body 23b. The end portion 23c is inserted into the pivot holes 13b, 14a in a state in which it is flush with or does not protrude from the side surface of the connecting piece 13.

Therefore, the welding end 23c of the pivot pin 23
is welded along the opening edge of the pivot hole 13b of the connecting piece 13 of the forceps 8 by laser welding, and FIG. 9 shows an enlarged view of the welded part 24 caused by the laser spot at that time. Figure a shows a welded part 24 formed by one laser spot having a diameter larger than the diameter of the welding end 23c, and figure b shows a welded part 24 formed by two laser spots having the same diameter as the welding end 23c. Figure c shows a welded part 24 formed by three laser spots, and figure d shows a welded part 24 formed by multiple laser spots.
are shown respectively.

As a laser used for laser welding processing, a laser such as a YAG laser, a carbon dioxide laser, or a ruby laser can be used.

Further, although a case is shown in which a welded portion 24 is provided on the connecting piece 13 of the forceps 8, by providing this on the link 14, that is, by inserting the pivot pin 23 from the side of the connecting piece 13 of the forceps 8, the welded portion Of course, it is also possible to implement this by providing 24 on the link 14.

In the figure, the same components as those shown in the third diagram are designated by the same numbers, and the explanation thereof will be omitted.

(Second Embodiment) FIG. 7 shows a second embodiment of the present invention. In particular, a link 14 connected to a connecting piece 13 of a forceps 8 according to the first embodiment is connected to an operating wire 15 via a joint fitting 16. FIG. 2 is a partially cutaway plan view showing an example in which the devices are connected.

Therefore, a countersunk rivet-shaped pivot pin (second pivot pin) with a length that does not exceed _l2 (sum of plate thickness) between the joint fitting 16 and both links 14 joined to the joint surface thereof. After inserting the welding pin 25 into the link 14 and the pivot holes 14b and 16a of the joint fitting 16, weld the welding end 25c of the pivot pin 25 to one link 1.
The pivot pin 25 is fixed at a welded portion 26 which is integrally welded along the opening edge of the pivot hole 14b of No. 4 by laser welding.

Note that the welded state of the welded portion 26 can be implemented in accordance with the above-described FIGS.

14f is a cup-shaped fitting hole provided at the opening edge of the pivot hole 14b, into which the head 25a of the pivot pin 25 is fitted.

(Third Embodiment) FIG. 8 shows a third embodiment of the present invention, in particular, a forceps head 1 as a connecting portion between forceps 8 and a flexible tube 10.
FIG. 2 is a partially cutaway plan view of an embodiment in which the device is connected to the device shown in FIG.

Thus, the connecting portions 8a of both forceps 8 are inserted into the slotted openings of the slotted opening cover 18, and countersunk rivets are inserted into the pivot holes 18a, 8b of the connecting portions 8a of the slotted opening cover 18 and both forceps 8. Insert the shaped pivot pin (third pivot pin) 27.

After that, the pivot pin 27 has a length that does not exceed the diameter l ₃ of the slotted opening cover 19, and the welding end 27c of the pivot pin 27 is attached. By integrally welding the slot opening cover 18 to the side surface (outer circumferential surface) by laser welding, the pivot pin 27 is fixed, and at the same time, both forceps 8 are attached to the slot opening cover 1 by the same pin 27.
It can be pivoted to 8.

Reference numeral 18b indicates a cup-shaped fitting hole provided at the opening edge of the pivot hole 18a, and the other configurations are the same as the configuration shown in FIG. Alternatively, descriptions of the types of lasers used in laser welding processing, etc. can be interpreted in accordance with the first and second embodiments, and will therefore be omitted.

Effects of the Invention According to the present invention, as is clear from the above embodiments, in an endoscopic forceps device including a pair of forceps that can be freely opened and closed, the connecting portion and the link of the forceps, and the link connected to the forceps and the operation. It is constructed by fixing a pivot pin that is pivotally connected between the wire connection part or the forceps connection part and the flexible tube connection part with a welded part at one end, and the following effects can be obtained. Can be done.

(1) Laser welding and other welding do not require any proficiency in caulking work, allowing for standardization of processing, greatly reducing quality variations among workers, and greatly improving yields.

(2) Compared to the man-hours required for caulking, the man-hours required for welding such as laser welding are extremely small, which has a significant effect on reducing man-hours.

(3) Caulked parts require a sanding process to remove the crushed part of the pin as a correction work, but in the case of welded parts such as laser welding, crushed parts (protrusions) do not occur as in the case of caulked parts. Therefore, the sanding process can be omitted, which has a great effect on reducing the number of man-hours.

(4) In the case of welded parts such as laser welding, the dimensional tolerance of the fitting of the parts is maintained even after welding, so the operation is in a reasonable condition, and there is no deformation of the pin as in the case of caulked parts. Operates smoothly.

[Brief explanation of drawings]

Fig. 1 is a partially omitted perspective view showing a conventional endoscope and a forceps device used therein, Fig. 2 is a partial sectional view of the forceps device, Figs. 3 a, b, 4,
5 is an explanatory diagram showing a method of connecting each connecting part in the configuration of a conventional forceps device, FIGS. 6 to 8 are partially cutaway plan views showing the first to third embodiments of the present invention, and FIG.
Figures a to d are enlarged plan views showing the laser welded portion of the welding end of the pivot pin. 8... Forceps, 8a... Connecting portion, 9... Forceps device, 10... Flexible tube, 11... Operation section, 12...
...forceps head, 13...connecting piece, 13a...junction, 13b, 14a, 14b, 16a, 18a...
... Pivot hole, 14 ... Link, 15 ... Operation wire, 16 ... Joint fitting, 17 ... Operation rod, 18 ...
...Slot opening cover, 19, 23, 25, 27...
... Pivot pin, 23a, 25a, 27a... Head,
23c, 25c, 27c... end for welding, 24,
26, 28...Welded part.

Claims (1)

[Scope of Claims] 1. A pair of forceps, each having a connecting piece protruding from a connecting part, a link connected to each of the connecting pieces via a first pivot pin, and a first pivot pin connected to each of the two links. a joint fitting for an operating wire connected via two pivot pins;
An endoscopic forceps device comprising a slotted opening cover rotatably supporting the forceps via a third pivot pin on each connecting portion of the forceps, wherein the connecting portion protrudes from the connecting portion of the forceps. The piece and the link are connected by a first pivot pin that has a large diameter part and a small diameter part and has a length that does not exceed the sum of the plate thicknesses of the connecting piece and the link. The end of the small diameter portion of the first pivot pin is fixed to either the connecting piece or the link of the forceps by a laser spot weld so that both ends of the pin do not protrude from each side surface. An endoscope forceps device characterized by: 2. A pair of forceps, each having a connecting piece protruding from the connecting part, a link connected to each of the connecting pieces via a first pivot pin, and a second pivot pin connected to the two links. The joint fittings of the operation wires are connected together,
An endoscopic forceps device comprising a slotted opening cover rotatably supporting the forceps via a third pivot pin at each connection portion of the forceps, wherein the two links are sandwiched between the links. A second pivot pin having a large diameter part and a small diameter part and a length not exceeding the sum of the plate thicknesses of the two links and the joint metal fittings is used to connect the two links. An end of the small diameter portion of the second pivot pin is fixed to one of the links by a laser spot weld so that both ends of the pin do not protrude from each side surface. Mirror forceps device. 3. A pair of forceps, each having a connecting piece protruding from a connecting part, a link connected to each of the connecting pieces via a first pivot pin, and a second pivot pin connected to the two links. The joint fittings of the operation wires are connected together,
An endoscopic forceps device comprising a slotted aperture cover rotatably supporting the forceps via a third pivot pin at each connection portion of the forceps, wherein the slotted aperture cover and the slotted aperture A connecting portion of each forceps sandwiched between the covers is rotatably supported by a third pivot pin having a large diameter portion and a small diameter portion and having a length that does not exceed the outer diameter of the slotted opening cover. Then, in order to prevent both ends of the pin from protruding from the outer circumferential surface of the slotted opening cover, the end of the small diameter portion of the third pivot pin is fixed to the outer circumferential surface of the slotted opening cover using a laser spot weld. An endoscopic forceps device characterized by: