JP2009066252A - High frequency treatment instrument for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high frequency treatment instrument for an endoscope, wherein a curved part formed at the distal end of a flexible sheath tube can be safely bent by remote control without generating problems on electric insulation from a conductive operation wire and strength or the like. <P>SOLUTION: The curved part 2 freely bendable by external force is formed at a part near the distal end of the flexible sheath tube 1, the distal end of an electrically insulating flexible tube 8 for operations inserted and disposed inside the flexible sheath tube 1 in the state of surrounding the conductive operation wire 7 is connected to the vicinity of the distal end of the curved part 2, and by operating the flexible tube 8 for operations from the proximal end side, the curved part 2 is bent. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a high-frequency treatment instrument for an endoscope.

  In general, a high-frequency treatment instrument for an endoscope has a conductive operation wire that is inserted and disposed in an electrically insulating flexible sheath that can be inserted into and removed from the treatment instrument insertion channel of the endoscope. It has the structure connected to the rod-shaped electrode provided so that it could protrude forward from the front-end | tip (for example, patent document 1).

  The conventional endoscope high-frequency treatment tool having such a configuration is not provided with a kind of bending portion that is bent by remote operation. Therefore, the change of the position and orientation of the rod-shaped electrode is performed by bending the bending portion of the endoscope through which the high-frequency treatment tool is passed, but there is a problem that the observation field of view of the endoscope is greatly changed. is there.

Accordingly, it is conceivable to form a bending portion that is bent by an external force in the vicinity of the distal end of the flexible mantle tube, and to bend the bending portion by remote operation from the hand side. Some endoscopic treatment tools include such a device, and the bending portion is bent by pushing and pulling a bending operation wire disposed in the flexible mantle tube (for example, patents). Reference 2).
JP 2002-153484 A JP-A-11-76403

  However, the flexible mantle tube used for the endoscope high-frequency treatment instrument is extremely thin with a diameter of about 2 mm, and an operation wire connected to a rod-shaped electrode is inserted and arranged at the axial position. If a bending operation wire is additionally arranged there, a problem of electrical insulation between the conductive operation wire and the bending operation wire occurs, or the operation wire needs to have a certain diameter or more so that a large current can flow. There is a possibility that the diameter of the bending operation wire becomes insufficient and a problem in strength occurs.

  According to the present invention, the bending portion formed at the distal end portion of the flexible mantle tube can be bent safely by remote operation without causing electrical insulation between the conductive manipulating wire and problems of strength. An object of the present invention is to provide an endoscopic high-frequency treatment instrument.

  In order to achieve the above-mentioned object, the high-frequency treatment instrument for an endoscope according to the present invention is an electrically conductive conductive tube that is inserted into an electrically insulating flexible outer tube that can be inserted into and removed from the treatment instrument insertion channel of the endoscope. In an endoscopic high-frequency treatment instrument having a configuration in which an operation wire is connected to a rod-shaped electrode that protrudes forward and backward from the distal end of a flexible mantle tube, a bending portion that can be bent by an external force is allowed. The tip of the flexible tube for electrical insulation, which is formed in the vicinity of the distal end of the flexible mantle tube and is inserted in the flexible mantle tube so as to surround the conductive operation wire, is near the tip of the bending portion. The bending portion is bent by operating the flexible tube for operation from the base end side.

  The bending portion may include a plurality of cuts formed from the side in the flexible mantle tube, and the bending portion is operated by pushing and pulling the operation flexible tube in the axial direction from the proximal end side. May be bent. And the flexible tube for operation may be arrange | positioned in the position displaced to the notch | incision side from the axial line position of the flexible mantle tube.

  According to the present invention, the bending portion is bent by operating the electrically insulating flexible operating tube inserted and arranged in the flexible mantle tube so as to surround the conductive operating wire from the base end side. The bending portion can be safely bent by remote operation without causing a problem of electrical insulation with the conductive operation wire or a problem with the strength of the bending operation wire.

  A conductive operation wire inserted into an electrically insulating flexible outer tube that can be inserted into and removed from an endoscope treatment instrument insertion channel protrudes forward and backward from the distal end of the flexible outer tube. In an endoscopic high-frequency treatment instrument having a configuration connected to a rod-shaped electrode that is arranged, a bending portion that can be bent by an external force is formed in the vicinity of the distal end of a flexible mantle tube, and a conductive operation wire is surrounded. By connecting the distal end of the electrically insulating flexible operating tube inserted in the flexible outer tube to the vicinity of the distal end of the bending portion and operating the flexible operating tube from the proximal end side The bend is bent.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows the overall configuration of an endoscope high-frequency treatment instrument, and FIG. 2 shows its distal end portion. A flexible outer tube 1 that can be inserted into and removed from an endoscope treatment instrument insertion channel (not shown). Is formed of an electrically insulating flexible tube such as a tetrafluoroethylene resin tube.

  A bending portion 2 that can be bent by an external force is formed in the vicinity of the distal end of the flexible outer tube 1. The bending portion 2 of this embodiment has a configuration in which a plurality of cuts 3 are formed in the flexible outer tube 1 from the side at intervals, and the cuts 3 of the flexible outer tube 1 are formed. If the existing side is compressed in the axial direction, the bending portion 2 bends toward the cut 3 side.

  A cap-like outer tube tip cap 4 is connected to the distal end of the flexible outer tube 1 via a connecting ring 5, and a through-hole formed in the distal end surface of the outer tube tip cap 4 in a direction parallel to the axis. A straight rod-like electrode 6 arranged so as to penetrate through the hole is arranged to protrude forward so as to be movable forward and backward in the axial direction so that it can protrude forward and backward from the outer tube tip cap 4.

  A conductive operation wire 7 made of a stranded metal wire having flexibility throughout the entire length of the flexible outer tube 1 has a sufficient gap between the inner surface of the flexible outer tube 1. The tip of the operation wire 7 is mechanically and electrically connected to the rear end of the rod-shaped electrode 6.

  In this embodiment, the rod-shaped electrode 6 is formed by extending the distal end portion of the operation wire 7 as it is. However, the rod-shaped electrode 6 is formed separately from the operation wire 7 with a conductive rod or the like to form a rod-shaped electrode. The electrode 6 and the operation wire 7 may be connected by a connecting member or the like. Further, the rod-like electrode 6 is not limited to a straight shape, and may have a shape in which the vicinity of the tip is bent, or may be partially covered with an electrical insulating material.

  An electrically insulating flexible operating tube 8 made of, for example, a tetrafluoroethylene resin tube or the like is inserted and disposed throughout the entire length of the flexible outer tube 1 so as to surround the operating wire 7.

  Thereby, even in the curved portion 2 having a simple structure in which the cut 3 is formed in the flexible mantle 1, electrical insulation is ensured between the operation wire 7 through which a high-frequency current flows and the outside. Yes. The distal end of the operating flexible tube 8 is sandwiched between the press-fit fixing member 9 fitted into the connecting ring 5 from the front side and the connecting ring 5 and connected and fixed there (that is, near the distal end of the bending portion 2). Has been.

  Therefore, when the operation flexible tube 8 is pulled from the base end side (right side in FIG. 1), an axial compressive force acts on the cut 3 and the bending portion 2 bends to the cut 3 side. In this embodiment, the operation flexible tube 8 (and the operation wire 7) is not at the axial position of the flexible outer tube 1 but at a position displaced toward the notch 3 from the axial position of the flexible outer tube 1. Therefore, the cut 3 is reliably compressed and the bending portion 2 can be smoothly bent toward the cut 3.

  A stopper ring 10 that is in contact with the rear surface of the press-fit fixing member 9 fixed in the outer tube distal end cap 4 is fixed near the proximal end of the rod-shaped electrode 6 (or near the distal end of the operation wire 7). The stopper ring 10 is movable in the axial direction in the operation flexible tube 8 together with the operation wire 7, and the stopper ring 10 abuts against the rear end surface of the press-fitting fixing member 9 and further forwards beyond the rod-shaped electrode 6. Is restricted.

Reference numeral 20 denotes an operation unit, which is illustrated on a smaller scale than the above-described tip portion.
A fixed finger hook 22 is formed at the rear end portion of the operation portion main body 21 to which the proximal end of the flexible mantle tube 1 is connected, and the operation wire 7 is attached to the movable finger hook 23 slidably supported on the operation portion main body 21. The base end is connected and fixed.

  Therefore, when the movable finger hook 23 is slid as shown by the arrow A, the rod-like electrode 6 moves in the axial direction as shown by the arrow B through the operation wire 7. Reference numeral 24 denotes a connection terminal to which a high-frequency power cord (not shown) is connected, and is electrically connected to the proximal end of the conductive operation wire 7.

  Reference numeral 25 denotes a bending operation ring slidably provided on the operation unit main body 21, and the base end of the operation flexible tube 8 is connected and fixed. Therefore, by sliding the bending operation ring 25 as indicated by the arrow C, the operation flexible tube 8 is pushed and pulled in the axial direction, and the bending portion 2 is bent as indicated by the arrow D.

  In this way, the bending portion 2 can be bent by operating the operation flexible tube 8 provided surrounding the operation wire 7 from the proximal end side, and thus a high-frequency current is applied to the rod-shaped electrode 6. The bending portion 2 can be safely bent by remote control without causing problems of electrical insulation between the operation wire 7 and the strength of the bending operation wire.

  In addition, this invention is not limited to the said Example, For example, the structure etc. which the curved part 2 connected the several joint ring | wheel so that rotation was possible may be sufficient. In addition, a cam mechanism or the like whose axial length is changed by being rotationally driven is disposed at the distal end portion of the bending portion 2, and the operation flexible tube 8 is rotated around the axis from the base end side. The cam mechanism may be operated and the bending portion 2 may be bent.

It is side surface sectional drawing which shows the whole structure of the high frequency treatment tool for endoscopes of the Example of this invention. It is an external appearance perspective view of the front-end | tip part of the high frequency treatment tool for endoscopes of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flexible outer tube 2 Bending part 3 Cutting 6 Bar-shaped electrode 7 Operation wire 8 Flexible tube for operation 20 Operation part 25 Bending operation ring

Claims (4)

A conductive operation wire inserted and placed in an electrically insulating flexible outer tube that can be inserted into and removed from the treatment instrument insertion channel of the endoscope can be moved forward and backward from the distal end of the flexible outer tube. In a high-frequency treatment instrument for an endoscope having a configuration connected to a protruding rod electrode,
A bending portion that can be bent by an external force is formed in the vicinity of the distal end of the flexible mantle tube, and the electrically insulating operation wire is inserted and arranged in the flexible mantle tube so as to surround the conductive manipulating wire. An internal view characterized in that the bending portion is bent by connecting the distal end of the flexible tube to the vicinity of the distal end of the bending portion and operating the flexible tube for operation from the proximal end side. High-frequency treatment tool for mirrors.   The high-frequency treatment instrument for endoscope according to claim 1, wherein the bending portion includes a plurality of cuts formed in the flexible mantle tube from the side.   The high-frequency treatment instrument for endoscope according to claim 2, wherein the bending portion is bent by pushing and pulling the flexible tube for operation in the axial direction from the proximal end side.   The high-frequency treatment instrument for an endoscope according to claim 3, wherein the flexible tube for operation is arranged at a position deviated from the axial position of the flexible outer tube toward the cut side.

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