JPS62275449A - Treatment tool for endoscope - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an endoscopic treatment tool having an improved structure of a flexible sheath body inserted into a treatment tool insertion channel of an endoscope.

[Prior Art] In general, a fixed wire is disposed inside a sheath body, such as a high-frequency coagulator, as an endoscopic treatment tool that is inserted into a treatment tool insertion channel of an endoscope. Those configured to carry out treatment by applying high-frequency electricity to the distal tip disposed on the distal end of the sheath body via a wire, etc., and those in which the operating wire can move freely inside the sheath body, such as grasping forceps used in combination with high-frequency treatment. There is a known configuration in which an operating section on the distal end side of the sheath body is operated as the operating wire moves forward and backward. In this type of endoscopic treatment tool, the outer periphery of a coil source formed by a tightly wound coil is covered with an insulating tube to form a flexible sheath body that is inserted into the treatment tool insertion channel of the endoscope. This insulating tube maintains electrical insulation between the inside and outside of the sheath body. in this case,
Conventionally, in the case of a one-piece insulating tube, the distal end of the insulating tube is fixed to a fixing member such as a distal end member, and the rear end is also fixed to a suitable fixing member.

[Problems to be Solved by the Invention] Generally, when the sheath body of an endoscopic treatment instrument is inserted into a body cavity through the treatment instrument insertion channel of an endoscope, a coil source is formed by a tightly wound coil. There was a problem that the coil source was bent and a part of the coil source was stretched. However, in conventional configurations, the distal end side of the insulating tube in the sheath body of the endoscopic treatment tool is fixed to a fixing member such as a distal end member, and the rear end side is also fixed to an appropriate fixing member. Therefore, if the coil source formed by the tightly wound coil is curved and a part of the coil source is extended, there is a problem in that a tensile force is applied to the insulating tube as the part of the coil source stretches. Therefore, the tensile force acting on the insulating tube may cause the distal end of the insulating tube to become unsecured from the fixed member such as the distal end member. There was a risk that it would fall out.

In this invention, even if the coil source is curved and a part of the coil source is stretched, there is no fear of tensile force acting on the insulating tube, and the tip side of the insulating tube and the fixing member such as the tip member are fixed. It is an object of the present invention to provide an endoscopic treatment instrument that can prevent the fixation between the two ends of the body from coming off.

[Means for Solving the Problems] In the present invention, the rear end of the insulating tube 3 that covers the outer periphery of the coil source 2 is arranged so that it can move forward and backward with respect to the coil source 2 without being fixed to any other member. be.

[Function] When the coil source 2 is bent and a part of the coil source 2 is extended, the rear end of the insulating tube 3 is moved forward and backward with respect to the coil source 2 as the coil source 2 is extended. This structure absorbs the tensile force acting on the insulating tube 3 and prevents a large force from acting on the fixed portion between the distal end side of the insulating tube 3 and the distal end member 4.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a high frequency coagulator according to a first embodiment of the present invention. This high-frequency coagulator is used for coagulating a target biological tissue, for example, to stop bleeding at a bleeding site, and 1 is a flexible sheath body of this high-frequency coagulator. The sheath main body 1 is formed by covering the outer circumferential surface of a coil source 2 formed of a tightly wound coil having an appropriate hardness with an electrically insulating insulating tube 3. In this case, the tip of the coil source 2 of the sheath body 1 is connected to the second
As shown in the figure, it is fixed to the rear end side of the tip member 4.

Furthermore, the tip of a wire 5 disposed inside the sheath body 1 is attached to the rear end side of the tip member 4. Further, a screw hole 4a is formed at the tip of the tip member 4, and a threaded portion 6 of the tip 6 is formed in the screw hole 4a.
A is removably screwed on. Furthermore, the sheath body 1
The distal end of the insulating tube 3 is fitted and fixed to the rear end of the distal end member 4.

On the other hand, the rear end portions of the coil source 2 and the wire 5 of the sheath body 1 are fixed in a state where the distal end side of the pin jack 7 is inserted into a sixty-eight as shown in FIG. A connecting end 9 connected to a high frequency power source is formed at the rear end of the bin jack 7. Further, a large diameter portion 10 is formed approximately at the center in the longitudinal direction of the bin jack 7, and a cylindrical insulating member 11 is fitted into this large diameter portion 10. Furthermore, a tubular anti-bending member 12 is fixed to the tip side of the bin jack 7. In this case, an appropriate distance S is formed between the bending prevention member 12 and the coil source 2. In addition, the rear end of the insulating tube 3 is inserted into the space S between the bending prevention member 12 and the coil source 2, and the rear end of the insulating tube 3 is not fixed to another member but can be used as a coil. It is arranged to move forward and backward with respect to the source 2. Note that the tip 6 and the tip member 4. Coil source 2. The wire 5, pin jack 7, etc. are made of conductive material such as metal, and with the connecting end 9 of the pin jack 7 connected to the high frequency power source side, the pin jack 7° coil source 2 is connected from the high frequency power source side. ．． A high frequency current is applied to the tip 6 through the wire 5 and the tip member 4, respectively.

When using this high-frequency coagulator, first, for example, with the endoscope inserted into the human body, the sheath body 1 side of the high-frequency coagulator is inserted into the treatment instrument insertion channel of the endoscope. Next, the distal tip 6 of the high-frequency coagulator is guided to the treatment target site of the living tissue, that is, the bleeding site within the body cavity. Furthermore, with the distal tip 6 applied to the bleeding site in the body cavity, the bottle junk 7, coil source 2. A high frequency current is applied to the tip 6 via the wire 5 and the tip member 4 to coagulate the biological tissue to be treated and stop bleeding. The rear end of the tube 3 is inserted into the space S between the bending prevention member 12 and the coil source 2, and the rear end of the insulating tube 3 is not fixed to any other member but is inserted into the distance S between the bending prevention member 12 and the coil source 2. Since the sheath body 1 is arranged to move forward and backward, for example, when the sheath body 1 is inserted into the body cavity through the treatment instrument insertion channel of an endoscope, the coil source 2 formed by the tightly wound coil is curved, and a part of the coil source 2 is inserted into the body cavity. When the coil source 2 is extended, the rear end of the insulating tube 3 can be moved forward and backward relative to the coil source 2 as the coil source 2 is extended. Therefore, by moving the insulating tube 3 back and forth, it is possible to absorb the tensile force that acts on the insulating tube 3 when the coil source 2 is deformed. can be prevented from acting, and the distal end side of the insulating tube 3 and the distal end member 4 can be prevented from becoming unfixed.

Further, FIG. 3 shows a second embodiment of the invention. This is because a constricted portion 13 that closely contacts the outer peripheral surface of the insulating tube 3 is formed at the tip of the anti-bending member 12 of the high-frequency coagulator of the first embodiment, and the constricted portion 13 of the anti-bend member 12 and the insulating tube 3 are connected to each other. The space between the two is watertight. In this case, since the space between the constriction part 13 of the bending prevention member 12 and the insulating tube 3 is maintained in a watertight state, liquid can be prevented from flowing between the bending prevention member 12 and the insulating tube 3. This makes it possible to improve safety by eliminating the risk of electrical leakage when high-frequency current is applied.

Furthermore, FIGS. 4 and 5 show a third embodiment of the present invention. This is the flexible sheath body of the Polypect grasping forceps. As shown in FIG. 4, the sheath main body 21 is formed by an electrically insulating insulating tube 23 attached to the outer peripheral surface of a coil source 22 formed of a tightly wound coil having an appropriate hardness. In this case, the tip of the coil source 22 of the sheath body 21 is connected to the tip member 2.
It is fixed to the rear end side of 4. The distal end member 24 is formed with an insertion tube portion 24a through which the connecting member 25 is inserted, and a support portion 24b that rotatably supports the pair of grip portions 26 and 27 about the rotation shaft 28.

Further, an operating wire 29 is inserted through the inside of the sheath body 21 so as to be freely advanced and retracted. The distal end side of the operating wire 29 is fitted into a fitting hole at the proximal end of the connecting member 25 and fixed by means such as soldering. Also,
One end of each of a pair of link arms 30a, 30b forming a link mechanism 30 is rotatably connected to the distal end of the connecting member 25. Furthermore, the other end of one link arm 30a is rotatably connected to the proximal arm 27a of one gripping section 27, and the other end of link arm 30b
The other end is rotatably connected to the proximal arm 26a of the other gripping section 26. As the operating wire 29 advances and retreats, the connecting member 25 is driven forward and backward, and in conjunction with the forward and backward movement of the connecting member 25, the grip portions 26 and 27 rotate around the rotation wheel 28 via the link mechanism 30. It is operated to open and close from a closed position in which the regripping parts 26, 27 are joined together to an open position in which the regripping parts 26, 27 are separated. Further, the distal end portion of the insulating tube 23 of the sheath body 21 is fixed to the rear end side of the distal end member 24 in a state that it is fitted onto the outside.

On the other hand, the rear end side of the sheath main body 21 is connected to an operating section main body 31 of the hand operating section, as shown in FIG. A tubular connecting member 33 is fixed to the inside of the operating section main body 31 via a coil 32, and an operating slider (not shown) is mounted thereon. Furthermore, an operating vibrator 3 is fixed to the rear end side of the operating wire 29 inside the connecting member 33.
It is arranged so that it can move forward or backward. The operating vibrator 34 is connected to the operating slider, and as the operating slider is operated, the operating wire 2 is connected to the operating vibrator 34.
9 is designed to be operated forward and backward. Further, the rear end side of the coil source 22 of the sheath body 21 is fixed to the inner circumferential surface side of the distal end portion of the connecting member 33. Furthermore, a tubular anti-bending member 35 is fixed to the outer peripheral surface of the distal end of the connecting member 33 . In this case, an appropriate distance S is formed between the bending prevention member 35 and the coil source 22.

In addition, the rear end of the insulating tube 23 is inserted into the space S between the bending prevention member 35 and the coil source 22, and the rear end of the insulating tube 23 is not fixed to another member but can be used to coil the coil. It is arranged to move forward and backward with respect to the source 22.

When using the grasping forceps, for example, with the endoscope inserted into the human body, the sheath body 21 side of the grasping forceps is inserted into the treatment tool insertion channel of the endoscope. Next, the operation slider installed on the operation unit main body 31 of the hand operation unit is moved forward to open the gripping parts 26 and 27, and in this state, the raw W tissue is guided to the treatment target area, and the gripping part 26 is moved to the desired position. .27
When the target body tissue is guided, the operating slider is moved back to close the gripping parts 26 and 27, and the living tissue to be treated is held between both grips 26 and 27.
grip it by. Furthermore, in this state, the polyp may be removed with a high-frequency snare inserted through another treatment instrument insertion channel of the endoscope, or the foreign body may be removed from the body together with the endoscope while still being held. Operations such as taking out and collecting foreign objects are performed.

Therefore, in the above structure, the rear end of the insulating tube 23 of the sheath body 21 is inserted into the interval S between the bending prevention member 35 and the coil source 22, and the rear end of the insulating tube 23 Since it is arranged so that it can move forward and backward with respect to the coil source 22 without being fixed to other members, the sheath body 21 can be inserted into the body cavity through the treatment instrument insertion channel of the endoscope, for example, as in the first embodiment. When the coil source 22 is inserted and the coil source 22 is bent and a part of the coil source 22 is extended, the rear end of the insulating tube 23 can be moved forward and backward with respect to the coil source 22 as the coil source 22 extends. To absorb the tensile force acting on the insulating tube 23 when the coil source 22 is deformed by moving the coil source 23 forward and backward, thereby preventing a large force from acting on the fixed part between the tip side of the insulating tube 23 and the tip member 24. This makes it possible to prevent the distal end side of the insulating tube 23 and the distal end abutment 24 from becoming unfixed.

It goes without saying that this invention can be applied only to the embodiments described above, and can also be modified in various ways without departing from the spirit of the invention.

[Effects of the Invention] According to the present invention, the rear end of the insulating tube that covers the outer periphery of the coil source is arranged so as to be able to move forward and backward with respect to the coil source without being fixed to other members, so that the coil source is curved. Even if a part of the coil source stretches, there is no risk of tensile force acting on the insulating tube, and the distal end of the insulating tube and the fixing member such as the distal end member can be prevented from coming loose. can.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, in which FIG. 1 is a longitudinal cross-sectional view showing the main structure of the rear end portion of a high-frequency coagulator, and FIG. FIG. 3 is a vertical cross-sectional view showing the main structure of the distal end portion of the high-frequency coagulator according to the second embodiment of the present invention. FIGS. This shows a third embodiment of the present invention, and FIG. 4 is a vertical cross-sectional view showing the main part (1'4 configuration) of the tip part of the grasping forceps, and FIG. 5 is the main part fM of the rear end part of the grasping forceps. 1.21... Sheath main body, 2.22... Coil source, 3, 23... Insulating tube, 4, 24... Tip member.

Claims (1)

[Claims] In an endoscopic treatment instrument in which an insulating tube is coated on the outer periphery of a coil source and a flexible sheath body is formed to be inserted into a treatment instrument insertion channel of an endoscope, the rear end of the insulating tube is An endoscopic treatment tool, characterized in that it is arranged so as to be movable forward and backward with respect to the coil source without being fixed to the member.