JP4320114B2 - Endoscopic high-frequency incision tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-frequency incision tool for an endoscope that is used through a treatment instrument insertion channel of an endoscope and in which a human tissue is incised by energizing a high-frequency current.
[0002]
[Prior art]
As a high-frequency incision instrument for an endoscope, a pair of side holes are formed in the vicinity of the distal end of an electrically insulating flexible tube at an interval in the axial direction thereof, and the conductive material is inserted into the flexible tube. A structure in which the wire is exposed outside the flexible tube between a pair of side holes is widely used (Japanese Utility Model Laid-Open No. 55-180502, Japanese Utility Model No. 6-1128).
[0003]
In the endoscopic high-frequency incision tool as described above, the conductive wire is pulled from the hand side and the flexible tube is bent in a bow shape between the pair of side holes, and conversely, the conductive wire is handed. There is a push type that pushes in from the side and bulges between a pair of side holes.
[0004]
[Problems to be solved by the invention]
As shown in FIG. 4, the high-frequency incision tool for an endoscope passes through a treatment tool raising portion 91 of the endoscope as shown in FIG. In some cases, a bent wrinkle may be attached in the vicinity of the tip of 92, and in the case of the pull type, a strong bent wrinkle may be attached by pulling the conductive wire 93.
[0005]
If the flexible tube is bent strongly like this, it will buckle and become unusable. To prevent this, some coil springs are arranged in the vicinity of the distal end of the flexible tube. (Japanese Utility Model Publication No. 55-175403, etc.).
[0006]
However, the presence of such a coil spring helps prevent the flexible tube from being bent, but does not contribute much to the force of straightening the flexible tube, and straightens the bending of the flexible tube. It cannot be returned.
[0007]
And if the bend crease near the tip of the flexible tube, for example, it becomes difficult to insert from the duodenum into the pancreaticobiliary duct, and even if it can be inserted, the flexible tube is flexible as shown in FIG. In some cases, the distal end of the tube 92 strongly hits the tube wall and is blocked, and it becomes impossible to deliver the contrast agent necessary for confirming the state.
[0008]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an endoscopic high-frequency incision tool that is easy to use and has excellent durability, in which a portion near the tip of a flexible tube in which a conductive wire is exposed is not easily bent. And
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the high-frequency incision tool for endoscopes of the present invention has a pair of side holes formed in the vicinity of the distal end of an electrically insulating flexible tube at intervals in the axial direction. In a high-frequency incision instrument for an endoscope in which a conductive wire inserted and disposed in a flexible tube is passed through a pair of side holes so that the conductive wire is exposed to the outside of the flexible tube between the pair of side holes. A coil spring is arranged in a state of being compressed in the axial direction of the flexible tube in the flexible tube at a portion between the holes.
[0010]
In addition, the rigid pipe material which receives the both ends of a coil spring can be fixed in a flexible tube, and a coil spring can be hold | maintained in a compression state.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows an endoscopic high-frequency incision instrument according to an embodiment of the present invention, wherein 1 is an electrically insulating material made of, for example, a tetrafluoroethylene resin tube having a diameter of about 2 mm and a total length of about 2 m. It is a flexible tube and is inserted into and removed from a treatment instrument insertion channel of an endoscope (not shown).
[0012]
The distal end of the flexible tube 1 is opened forward (tip opening 1a). A flexible conductive wire 2 is inserted into the flexible tube 1 so as to be able to advance and retract in the axial direction over substantially the entire length, and can be arbitrarily advanced and retracted from the operation unit 10 side.
[0013]
A slider 11 to which the proximal end portion of the conductive wire 2 is connected is movably disposed in the operation unit 10, and a connection terminal 12 to which a high-frequency power cord (not shown) is connected is electrically connected to the conductive wire 2. Is arranged.
[0014]
Further, in the vicinity of the connecting portion between the flexible tube 1 and the operation unit 10, a contrast agent injection port 13 communicating with the flexible tube 1 is formed so as to protrude from the conductive wire 2 to the operation unit 10 side. A sealing O-ring 14 is disposed in the portion, so that the contrast medium injection port 13 does not communicate with the operation unit 10 side.
[0015]
A pair of side holes 3 and 4 are formed at the distal end portion of the flexible tube 1 with an interval of, for example, about 2 to 5 cm in the axial direction, as shown in an enlarged view in FIG. The side holes 3 are formed so as to be inclined obliquely forward from the outside to the inside, and the rear side holes 4 are formed obliquely inclined backward from the outside to the inside.
[0016]
And the part near the front-end | tip of the conductive wire 2 inserted and arrange | positioned in the flexible tube 1 is passed through a pair of side holes 3 and 4, and the flexible tube 1 of only between the both-side holes 3 and 4 is provided. It arrange | positions in the state exposed to the exterior (exposed part 2a).
[0017]
Inside the front side hole 3, a wire fixing hard pipe 5 made of, for example, a stainless steel pipe, to which the distal end portion 2 b of the conductive wire 2 is fixed, is tightly fitted in the flexible tube 1. It is inserted and arranged.
[0018]
In the wire fixing rigid pipe 5, a hole 6 through which the conductive wire 2 passes is formed obliquely on the side wall of the intermediate portion so as to face the front side hole 3, and the conductive wire 2 passed through the hole 6. The tip 2b is fixed to the inner peripheral surface of the wire fixing rigid pipe 5 by silver brazing or the like, and the gap of the hole 6 is also closed. However, the wire fixing rigid pipe 5 itself penetrates in the axial direction.
[0019]
The wire fixing hard pipe 5 is tightly inserted into the flexible tube 1, and after the wire fixing hard pipe 5 is inserted into the flexible tube 1, the flexible tube 1 is heated to reduce the diameter. By doing so, the wire fixing hard pipe 5 can be tightly fixed in the flexible tube 1.
[0020]
Alternatively, the outer diameter of the wire fixing hard pipe 5 is formed to be slightly thicker than the inner diameter of the flexible tube 1 in advance, and the wire fixing hard pipe 5 is press-fitted into the flexible tube 1 to be tightly fixed. Also good.
[0021]
In such a state, the wire fixing rigid pipe 5 is disposed at a position straddling the front and rear sides of the front side hole 3, and thereby, between the inside of the flexible tube 1 and the front side hole 3. Is almost blocked.
[0022]
Inside the rear side hole 4, a through hole 8 through which the conductive wire 2 is allowed to advance and retract is formed of, for example, a stainless steel pipe formed obliquely on the side wall of the intermediate portion so as to face the rear side hole 4. The wire-passing hard pipe 7 is tightly inserted and arranged in a state of being firmly fixed in the flexible tube 1.
[0023]
The wire-passing hard pipe 7 is arranged in the flexible tube 1 in a state similar to the wire-fixing hard pipe 5 and straddles the front and rear side holes 4, thereby providing flexibility. The space between the inside of the tube 1 and the rear side hole 4 is almost closed.
[0024]
Between the wire fixing rigid pipe 5 and the wire passing rigid pipe 7, for example, a coil spring 9 made of stainless steel wire is compressed in the axial direction of the flexible tube 1 and is inside the flexible tube 1. Is arranged.
[0025]
The outer diameter of the coil spring 9 is such that it can be loosely inserted into the flexible tube 1. In this embodiment, a stainless steel wire having a circular cross section is used.
[0026]
FIG. 1 shows both a state before the coil spring 9 is compressed and a state in which the coil spring 9 is compressed by being incorporated into the flexible tube 1. By arrange | positioning in, it can prevent that the flexible tube 1 bends in the part, and durability improves.
[0027]
Further, the coil spring 9 disposed in the flexible tube 1 in a state compressed in the axial direction of the flexible tube 1 tries to extend the flexible tube 1 straight by its extension force. Even if the flexible tube 1 is bent and bent between 3 and 4, the coil spring 9 forcibly returns it to the straight state, so that the flexible tube 1 is hardly bent.
[0028]
In the endoscope high-frequency incision instrument configured as described above, by pulling or pushing the conductive wire 2 from the operation unit 10 side, a pair of sides as shown by a two-dot chain line in FIG. The flexible tube 1 can be bent in the shape of a bow between the holes 3 and 4, or the exposed portion 2a of the conductive wire 2 can be bulged. Can do.
[0029]
Then, as required by the position confirmation before the incision or the like, by injecting the contrast agent from the contrast agent inlet 13 as indicated by the arrow A, the inside of the flexible tube 1 is indicated as indicated by the arrow B. The contrast agent can be sent out from the front end opening 1a via the route.
[0030]
Further, since the flexible tube 1 is unlikely to be bent between the side holes 3 and 4 due to the action of the coil spring 9 which is compressed and disposed in the flexible tube 1, it is guided into the pancreaticobiliary duct or the like. In addition, the distal end opening 1a of the flexible tube 1 is unlikely to be blocked by being strongly abutted against the tube wall, and the contrast medium can be delivered reliably.
[0031]
The present invention is not limited to the above embodiment. For example, as shown in FIG. 3, a helical tube 29 in which a stainless steel strip or the like is spirally wound with a constant diameter is compressed in the axial direction. It may be used as a compression coil spring, and the side hole 4 (or 3) may not be blocked by the member 27 that receives the end portion.
[0032]
【The invention's effect】
According to the present invention, the coil spring is disposed in the flexible tube in the portion between the pair of side holes while being compressed in the axial direction of the flexible tube. It is possible to obtain a high-frequency incision tool for an endoscope which is difficult to bend at the vicinity of the distal end of the flexible tube disposed so as to be exposed, has good insertability, is easy to use, and has excellent durability.
[Brief description of the drawings]
FIG. 1 is a side cross-sectional view of a distal end portion of an endoscope high-frequency incision instrument according to a first embodiment of the present invention.
FIG. 2 is a side view showing the overall configuration of the endoscope high-frequency incision instrument according to the first embodiment of the present invention.
FIG. 3 is a side cross-sectional view of a distal end portion of an endoscope high-frequency incision instrument according to a second embodiment of the present invention.
FIG. 4 is a schematic view of a conventional endoscope high-frequency incision device in use.
FIG. 5 is a schematic view of a conventional endoscope high-frequency incision device in use.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flexible tube 2 Conductive wire 3, 4 Side hole 9 Coil spring 29 Spiral tube

Claims (2)

A pair of side holes are formed in the vicinity of the distal end of the electrically insulating flexible tube with an interval in the axial direction, and a conductive wire inserted and disposed in the flexible tube is connected to the pair of side holes. In the endoscopic high-frequency incision instrument passed through the pair of side holes so as to be exposed outside the flexible tube between,
A rigid pipe is tightly fixed in the flexible tube across the pair of side holes , and the conductive wire is passed through the side holes from an intermediate position of the rigid pipes. A coil spring is disposed in the flexible tube between the two, and the coil spring is held in a state compressed in the axial direction by the two hard pipes. A high-frequency incision tool for an endoscope which acts to straighten the vicinity of the distal end of the tube . The high-frequency incision tool for an endoscope according to claim 1 , wherein the coil spring is formed by spirally winding a band material with a constant diameter .

Images