High frequency treatment tool for endoscope

A high frequency treatment tool for an endoscope, comprising:

• a flexible insulating tube to be inserted into and pulled out of an accessory channel of the endoscope, the flexible insulating tube including a wire insertion channel and a water channel through which water is conveyed, the wire insertion channel and the water channel being separately formed in an axis line direction of the flexible insulating tube;
• a conductive wire configured to move back and forth in an axis line direction thereof through the wire insertion channel;
• an electrode configured to project and recede from a distal end of the flexible insulating tube;
• and
• a nozzle formed at the distal end portion of the flexible insulating tube, the nozzle being configured to direct water conveyed through the water channel to the electrode.

A high frequency treatment tool for an endoscope, comprising:

• a flexible insulating tube to be inserted into and pulled out of an accessory channel of the endoscope, the flexible insulating tube including a wire insertion channel and a water channel through which water is conveyed, the wire insertion channel and the water channel being separately formed in an axis line direction of the flexible insulating tube such that each of axis lines of the wire insertion channel and the water channel is eccentric with respect to the axis line of the flexible insulating tube;
• a conductive wire configured to move back and forth in an axis line direction thereof through the wire insertion channel;
• an electrode coupled to the conductive wire such that an axis line of the electrode is eccentric with respect to an axis line of the conductive wire, the electrode being configured to project and recede from a distal end of the flexible insulating tube on the axis line of the flexible insulating tube;
• and
• a regulating member provided at the distal end portion of the flexible insulating tube, the regulating member being configured to regulate movement of the electrode such that the electrode stably projects and recedes from the distal end of the flexible insulating tube.