| 摘要 |
A high frequency electrosurgical instrument for an endoscope comprises a flexible tube which has at a distal end portion a pair of wire guiding holes spaced from each other in the axial direction of the tube. In the distal end portion of the tube a flexible coil is inserted, which extends at least between the wire guiding holes. An electrode wire extends in the tube from a distal end of the flexible coil, comes out of the tube through the wire guiding hole located adjacent to the distal end of the tube, reenters the tube through the wire guiding hole located adjacent to the proximal end of the tube and through a pair of turns of the coil which are located near the latter wire guiding hole, extends through the tube to the proximal end of the tube, and is connected to a high frequency power source. The electrode wire is reciprocable within the tube, except for its distal end portion. The flexible coil prevents said electrode wire from cutting the tube to form a slit extending from either wire guiding hole and prevents said tube from collapsing.
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