JP4575709B2 - Endoscopic high-frequency treatment instrument - Google Patents

Description

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

  Although there are many types of high-frequency treatment tools for endoscopes, high-frequency treatment tools for endoscopes used as high-frequency knives for cutting the surface of mucous membranes, etc., advance and retreat in the axial direction in an electrically insulating sheath. A rod-shaped electrode that protrudes and retracts from the distal end of the electrically insulating sheath by advancing and retracting the manipulation wire is attached to the distal end of a conductive manipulation wire that is freely inserted and arranged (for example, Patent Document 1). ).

  However, if such a configuration is simply adopted, the manufacturing process for connecting the rod-shaped electrode to the tip of the operation wire takes time and costs are increased, and at the same time, the rod-shaped electrode may be detached from the tip of the manipulation wire during use. There is, and it is not perfect for safety.

Therefore, conventionally, the rod-shaped electrode is integrally formed with the operation wire by melting the tip portion of the operation wire by plasma processing (for example, Patent Document 2).
JP-A-62-87144 JP-A-63-97154

  However, when the tip of the operation wire is melted by plasma processing to form a rod-shaped electrode, the possibility that the rod-shaped electrode falls off from the tip of the manipulation wire is reduced, but a very special device is required as a manufacturing process. The cost is higher than that of connecting the rod-like electrode to the tip of the operation wire.

  Accordingly, an object of the present invention is to provide a high-frequency treatment instrument for an endoscope which can be easily manufactured at low cost without causing the rod-shaped electrode to drop from the tip of the operation wire.

  In order to achieve the above-described object, the high-frequency treatment instrument for endoscope according to the present invention is configured to advance and retract an operation wire at the tip of a conductive operation wire that is inserted in an electrically insulating sheath so as to be movable forward and backward in the axial direction. In the endoscopic high-frequency treatment instrument provided with the rod-like electrode protruding and retracting from the tip of the electrically insulating sheath, the operation wire is formed by a stranded wire formed by twisting a plurality of strands. One strand of a plurality of strands forming a line is projected forward longer than the other strands, and the projecting portion is formed as a rod-shaped electrode.

  In addition, it is preferable that a plurality of strands are fixed to each other at the base portion of the rod-shaped electrode, and the operation wire is formed by twisting a plurality of other strands around a core wire that is a straight strand. The tip portion of the core wire may be a rod-shaped electrode.

  In that case, the operation wire is a 1 × 7 twisted strand formed by twisting a plurality of strands around the core wire, and the core wire has a diameter larger than the diameter of each other strand. The diameter of the core wire may be in the range of 1/3 to 1/2 of the diameter of the stranded wire.

  Further, the operation wire may be formed of a 1 × 3 twisted strand wire in which three strands are twisted together.

  According to the present invention, the operation wire is formed of a stranded wire formed by twisting a plurality of strands, and one strand among the plurality of strands forming the stranded strand is replaced with another strand. By projecting forward for a long time and using the projecting portion as a rod-shaped electrode, the rod-shaped electrode is not likely to fall off from the tip of the operation wire, and can be easily manufactured at low cost.

  A rod-like electrode that protrudes and retracts from the distal end of the electrically insulating sheath by moving the operating wire forward and backward is provided at the distal end of the electrically conductive operating wire that is inserted and disposed in the electrically insulating sheath so as to be movable back and forth in the axial direction. In a high-frequency treatment instrument for endoscopes, an operation wire is formed by a stranded wire formed by twisting a plurality of strands, and one strand of the plurality of strands forming the stranded wire is replaced with another strand. It protrudes ahead longer than a line | wire, and makes the protrusion part a rod-shaped electrode.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows an overall configuration of an endoscopic high-frequency treatment instrument used through a treatment instrument insertion channel of an endoscope. For example, an electrically insulating flexible material such as a tetrafluoroethylene resin tube or the like is shown. A conductive operation wire 2 made of a stranded wire formed by twisting a plurality of strands made of stainless steel wire, for example, is inserted in an electrically insulating sheath 1 made of a tube so as to be movable back and forth in the axial direction. Yes.

  As shown in a cross section in FIG. 3, the stranded wire forming the operation wire 2 of this embodiment has six strands 2 b having the same diameter as the core wire 2 a around the core wire 2 a, which is a straight strand. The operation wire 2 has a diameter D that is three times the diameter d of the core wire 2a (ie, D = 3d).

  In order to accurately transmit the forward / backward movement of the operation wire 2 on the proximal end side of the electrically insulating sheath 1 to the distal end side, the operation wire 2 is prevented from rattling in the electrically insulating sheath 1. The inner diameter dimension of the electrically insulating sheath 1 may be set to be slightly larger than the diameter dimension of the operation wire 2.

  At the distal end of the operation wire 2 positioned at the distal end portion of the electrically insulating sheath 1, a conductive rod-like electrode 3 is provided that projects straight forward from the distal end of the electrically insulating sheath 1 as the operation wire 2 moves forward and backward. It has been.

  The rod-like electrode 3 is formed by a protruding portion in which one strand (core wire 2a) of a plurality of strands forming the operation wire 2 made of a stranded wire is projected forward longer than the other strands. ing. Note that the rod-shaped electrode 3 is not necessarily straight, and the tip of the rod-shaped electrode 3 may be bent into a hook shape, for example.

  FIG. 1 is an enlarged view of the distal end portion of a high-frequency treatment instrument for an endoscope. The rod-shaped electrode 3 extends a core wire 2a straight ahead of the other six strands 2b by about 2 to 5 mm, for example. The six strands 2b are fixed to each other together with the rod-like electrode 3 by brazing or the like at the base portion of the rod-like electrode 3.

  FIG. 1 shows a state in which the tip portions of the six strands 2b protrude from the tip of the electrically insulating sheath 1 for easy understanding, but actually the tip portions of the six strands 2b. It is not necessary to protrude from the tip of the electrically insulating sheath 1 (however, it does not matter if it protrudes).

  The diameter (d) of the rod-shaped electrode 3 is preferably in the range of 0.2 to 0.4 mm, and is most preferably set to about 0.3 mm. In this case, the diameter D of the operation wire 2 is 0.9 mm, which is very preferable as a thickness used through the treatment instrument insertion channel of the endoscope.

  Returning to FIG. 2, the operation unit 10 is connected to the proximal end of the electrically insulating sheath 1. In the operation unit 10 of this embodiment, the proximal end of the electrically insulating sheath 1 is connected to one end side of an operation unit main body 11 configured by combining a plurality of components, and the operation is performed from the proximal end of the electrically insulating sheath 1. An operation knob 12 is attached to a proximal end portion of the operation wire 2 that passes through the inside of the unit body 11 and extends to the other end side of the operation unit body 11.

  Therefore, by grasping the operation knob 12 and moving the proximal end portion of the operation wire 2 forward and backward in the axial direction, the operation wire 2 advances and retreats in the electrically insulating sheath 1, so that the rod shape extends from the distal end of the electrically insulating sheath 1. The electrode 3 protrudes.

  In addition, a connection terminal 13 to which the high frequency power cord 20 is connected is disposed on the operation knob 12 so as to be electrically connected to the operation wire 2, and a high frequency current can be supplied to the rod-shaped electrode 3 through the operation wire 2. . Reference numeral 14 denotes an injection port for attaching a syringe barrel (not shown) and the like to allow fluid to pass through the electrically insulating sheath 1, and 15 denotes an O-ring for sealing.

  Since the rod-shaped electrode 3 is formed by the core wire 2a of the operation wire 2 made of a stranded wire in the endoscope high-frequency treatment instrument configured as described above, the rod-shaped electrode 3 may fall off from the distal end of the operation wire 2. Therefore, the rod-shaped electrode 3 can be easily manufactured at a very low cost.

  In addition, this invention is not limited to the said Example, For example, in order to form the rod-shaped electrode 3 thickly, as FIG. 4 shows, the diameter d of the core wire 2a of the operation wire 2 used as the rod-shaped electrode 3 is set. You may form thicker than the diameter of the other six strand 2b.

  However, since the diameter d of the core wire 2a is preferably less than or equal to half the diameter D of the operation wire 2 so that the rigidity of the operation wire 2 does not become excessively large, the diameter d of the core wire 2a is equal to the diameter D of the operation wire 2. It should be in the range of 1/3 to 1/2.

  Further, as the operation wire 2, as shown in FIG. 5, a 1 × 3 twisted strand may be used, and any one of the three strands may be used as the rod-shaped electrode 3. Further, other strands such as 1 × 19 strands or 1 × 39 strands can be used as the operation wire 2, and in that case, the core wire 2 a that becomes the rod-like electrode 3 is used as the other strand. A device such as making the line thicker than the line 2b is necessary.

It is a perspective view of the front-end | tip part of the high frequency treatment tool for endoscopes of 1st Example of this invention. It is side surface sectional drawing which shows the whole structure of the high frequency treatment tool for endoscopes of 1st Example of this invention. It is sectional drawing of the operation wire of the high frequency treatment tool for endoscopes of the 1st Example of this invention. It is sectional drawing of the operation wire of the high frequency treatment tool for endoscopes of the 2nd Example of this invention. It is sectional drawing of the operation wire of the high frequency treatment tool for endoscopes of the 3rd Example of this invention.

Explanation of symbols

1 Electrically Insulating Sheath 2 Operation Wire 2a Core Wire (One Straight Wire)
2b Wire 3 Rod electrode 10 Operation unit

Claims (3)

A rod-shaped electrode that protrudes and retracts from the distal end of the electrically insulating sheath by moving the operational wire forward and backward is provided at the distal end of a conductive operating wire that is inserted and disposed in the electrically insulating sheath so as to be movable back and forth in the axial direction. In a high-frequency treatment instrument for endoscopes,
The operation wire is formed of a stranded wire formed by twisting a plurality of strands around a single straight core wire having a diameter larger than each of the strands, and a tip portion of the core wire is formed from other strands. An internal view characterized in that it protrudes long forward, the protruding portion is the rod electrode, and the plurality of strands are fixed together with the rod electrode at the base portion of the rod electrode. High-frequency treatment tool for mirrors. The operation wire, the endoscopic high-frequency treatment instrument according to claim 1 Symbol mounting a 1 × 7-ply twisted wire formed by twisting a plurality of strands of six around the core wire. The high-frequency treatment instrument for an endoscope according to claim 1 or 2, wherein a diameter of the core wire is in a range of 1/3 to 1/2 of a diameter of the stranded wire.

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