| 摘要 |
An operating unit for an endoscopic treatment tool, which facilitates smooth operation of a medical or surgical treatment mechanism protruded from an end of an endoscope. A motion converting mechanism is provided inside the operating unit. The mechanism includes a pinion rotatably supported on a connecting rod of a finger-retaining portion, a first rack formed on a cylindrical body of the operating unit, and a second rack formed on a coupling member connected to the end of the connecting wire. The pinion meshes with both the first and second racks, so that the movement of the finger-retaining portion results in movement of the connecting wire, with a certain magnification.
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