JPH0243500B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a forceps device, and in particular,
The present invention relates to a forceps device in which the tip of the forceps device can be controlled in any direction.

Generally, an endoscope is used when performing various procedures such as cutting and collecting tissue cells within a body cavity, crushing stones in the biliary tract, or injecting medicinal solutions. This is done through a forceps insertion channel provided in the. A so-called forceps device that performs such a procedure, for example, if we take a forceps device that collects tissue cells, has a forceps section that collects tissue cells, a forceps section that has this forceps section at its tip, and a proximal end that serves as a hand control section. A flexible tube consisting of a tightly connected coil spring or a resin tube, etc., and an operation wire for controlling the operation of the forceps section, which is inserted into the flexible tube and whose tip end is fixed to the forceps section and whose proximal end is connected to the hand control section. Equipped with.

However, although the forceps devices known so far have the above-mentioned configuration, they do not themselves have any means for controlling the direction of the tip of the forceps device; The reality is that it is controlled only by the directional control means provided. However, providing a forceps direction control means on an endoscope in this way does not have sufficient space, especially for a small diameter endoscope such as a bronchoscope. Despite this, when using this type of bronchoscope, there are many requests to collect tissue cells in the curved terminal bronchus, which is deeper than the limit of insertion of the bronchoscope, and the forceps device itself is not suitable for this purpose. The reality is that a forceps device that can control the direction of the tip is desired.

In view of these circumstances, the present invention provides a forceps device capable of controlling the direction of the tip.Hereinafter, the forceps device according to the present invention will be described based on an embodiment shown in the accompanying drawings. .

1 to 3, reference numeral 10 denotes a forceps section, numeral 20 denotes a hand operation section, and numeral 30 denotes a flexible tube formed by a tight coil spring that connects the forceps section 10 and the hand operation section 20. , and 40 indicate operating wires drawn through the flexible tube 30. The forceps section 10 includes a flexible tube 30 as shown in FIG.
a holding member 11 fixed to the distal end of the holding member 11; and a pair of forceps members 13a and 13 pivotally supported on the distal end side of the holding member 11 by a support shaft 12 with their substantially central portions intersecting.
b, a pair of link members 16 and 17 whose one ends are pivotally supported at the rear ends of the forceps members 13a and 13b by support shafts 14 and 15, and this link member 16.
and a wire connector 19 whose other end 17 is pivotally supported by a support shaft 18 and connected to an operating wire 40. The holding member 11 is formed into a cylindrical shape whose base end fits around the outer periphery of the distal end of the flexible tube 30 and is soldered to the flexible tube 30, and allows the wire connector 19 to move forward and backward. It has a guide opening 11a for guiding. Also, wire connector 19
is connected to the operating wire 40 by inserting the tip of the operating wire 40 into the wire intake hole and fixing the opening.

The hand operation unit 20 includes a support shaft 21, an operation knob 22 fitted on the outer periphery of the support shaft 21 so as to be movable in the axial direction, and an elongated hole 21a provided in the support shaft 21 in the axial direction. and the above operation knob 22.
a slider 24 that engages with the interlocking pin 23 and is movable in the axial direction within the support shaft 21 integrally with the operation knob 22; and a cylindrical stator 31 fixed to the proximal end of the flexible tube 30. and a connecting cylinder 25 that engages with the flange portion 31a of the stator 31 and is screwed onto the tip of the support shaft 21 in order to fixedly connect it to the tip of the support shaft 21.
The slider 24 has an insertion hole 24a through which the tube-like sheath 41 fitted around the outer periphery of the proximal end of the operating wire 40 can be inserted, and projects upward in FIG. 3 through the insertion hole 24a. Operation wire 40
By soldering the base end of the sheath 41 and the base end of the sheath 41 together, the operating wire 40
is fixedly connected. Since the operating wire 40 is made of stranded wire, the proximal end of the operating wire 40 is loosened into a bead shape to enhance the prevention effect. In addition, in FIG. 3, the reference numeral 32 indicates the flexible tube 3.
This protective member 32 is made of a tight coil spring that prevents bending near the proximal end of the
It is fixed to the stator 31.

The above configuration is a configuration of a forceps device known so far, and a forceps device equipped with such a configuration is
The forceps section 10 is inserted through a well-known forceps insertion channel of an endoscope (not shown) to protrude from the distal end of the endoscope, and after the forceps section 10 is guided to the target site, the operation knob 24 is turned down as shown in FIG. By moving the operating wire 40 in the direction, the operating wire connector 19 is advanced and the link members 16 and 1 are moved forward.
7 to open the forceps members 13a and 13b so as to separate them from each other so as to sandwich the tissue cells at the target site, and then move the operating knob 24 upward in FIG. 3 to open the forceps members 13a and 13b. This is a so-called cup-shaped double-opening forceps device in which tissue cells are excised, taken in, and collected by closing them together.

In one embodiment of the forceps device according to the present invention, in FIG. The pitch gap is widened compared to the case where the fibers are in close contact with each other.), and the bending behavior is imparted as shown by the solid line in FIG.

Further, the hand operation unit 20 includes an operation wire tension adjustment knob 25 that is screwed into a threaded portion 21b formed on the outer periphery of the support shaft 21, and this adjustment knob 2.
5 and a stopper 27 that is integrally movable in the axial direction within the support shaft 21 with an interlocking pin 26 through the elongated hole 21a, and a stopper 27 that is inserted between this stopper 27 and the slider 24. A compression coil spring 28 is provided. It goes without saying that the adjustment knob 25 and the interlocking pin 26 engage with each other only when the adjustment knob 25 moves in the axial direction through the circumferential groove 25a provided on the inner peripheral surface of the adjustment knob 25. Further, the stopper 27 has a guide hole 27a in its center, through which the sheath 41 fitted over the operating wire 40 can be loosely inserted. The above compression coil spring 2
8, the compression force can be changed by the stopper 27 by operating the adjustment knob 25, and the forceps members 13a and 13b of the forceps part 10 can be mutually moved while maintaining the bending behavior of the tip portion 32 of the flexible tube 30. The slider 24 (together with the operating knob 22) is selected and adjusted so as to bias it upward in FIG. 3 so as to maintain the closed state.

In the forceps device configured as described above, when no operating force is applied to the operating knob 22, the forceps section 10 is held in a closed state, and the distal end portion 32 of the flexible tube 30 is held as shown in FIGS. It is in a bent state as shown in Figure 2. The forceps device in such a state,
Forceps part 10 inserted into the forceps insertion channel of the endoscope
After the distal end portion 32 of the flexible tube 30 protrudes from the distal end of the endoscope, the operation knob 22 is moved upward in FIG. 3 to straighten it as shown by the broken line in FIG. 2. The amount of bending of the distal end portion 32 of the flexible tube 30 can be changed up to the following state. That is, in this forceps device, by moving the operating knob 22 further upward from the state shown in FIG. 3, the operating wire 40 is further tensioned from the closed state of the forceps section 10, and the tension is reduced. acts to narrow the pitch of the tight coil spring on the right side in FIG. It is possible. Note that in this forceps device, the forceps members 13a and 13b of the forceps section 10 can be mutually opened by moving the operation knob 22 downward in FIG. 3 against the biasing force of the compression coil spring 28. It goes without saying that it can be done.

As described above, the forceps device according to the present invention allows the distal end side to be oscillated by manual operation, making it extremely easy to guide the forceps to a desired target area, particularly in the bronchus. This is advantageous when treating a body cavity that is narrow like a mirror and has many curved parts.

Note that the forceps device according to the present invention is not limited to the above-mentioned embodiment. For example, instead of forming the entire flexible tube with a tight coil spring, at least only the portion where it is desired to impart bending behavior may be formed with a tight coil spring. In addition, if the forceps part does not require any operation, such as a hypodermic needle, one end may be fixed to the tip of the flexible tube instead of the operation wire connecting the hand control part and the forceps part. A wire dedicated to adjusting the amount of bending is sufficient. Furthermore, as in the above embodiment, if the forceps are not so-called double-opening forceps, but do not involve opening and closing operations, there is no need to take care to maintain the forceps in a closed state so as not to injure the inside of the body cavity. There is no need for an adjustment knob or compression coil spring to hold the operating wire in tension.

Furthermore, the forceps device according to the present invention skillfully utilizes tight coil springs, and although it is capable of imparting a bending habit in one place, it is also possible to impart a plurality of complex bending habits, and it is also capable of imparting right-handed or left-handed twisting. By selecting and using either of the close coil springs, the so-called swinging motion can be made into a swinging motion that involves clockwise or counterclockwise rotation.For convenience of use, the close coil spring has a bent shape and winding. By selecting the direction, the utility value can be made even higher, and the effects achieved by the present invention are extremely large.

[Brief explanation of drawings]

FIG. 1 is an overall schematic diagram of an embodiment of the forceps device according to the present invention, FIG. 2 is a partial cross-sectional view showing the distal end side thereof, and FIG. 3 is a partial cross-sectional view showing the hand operation part. It is a diagram. 10... Forceps part, 13a, 13b... Forceps member, 20... Hand operation unit, 22... Operation knob,
25...adjustment knob, 28...compression coil spring,
30... Flexible tube, 32... Tip portion of flexible tube, 4
0... Operation wire.

Claims (1)

[Claims] 1. In a forceps device that is inserted into a forceps insertion channel of an endoscope and has a flexible tube at least on the distal end side formed by a close coil spring, the pitch interval on one side of the close coil spring on the distal end side is compared to the other side. In addition, a wire for adjusting the amount of bending is provided, which is passed through the flexible tube, has its tip fixed to the distal end of the flexible tube, and has its proximal end connected to the hand control unit. Characteristic forceps device.