Patent ID: 7494499

Claim:
A surgical therapeutic instrument comprising: an inserting part to be inserted into a body; a therapeutic part provided on a distal tip of the inserting part and having a movable portion; a manipulating part provided on a proximal side of the inserting part for manipulating the movable portion of the therapeutic part; a first link part connected to the therapeutic part; a second link part provided proximal of the first link part, and connected to the manipulating part; a first transmission shaft connected to the first link part; a second transmission shaft connected to the second link part; a first rotation joint for connecting the first transmission shaft and the second transmission shaft such that the first transmission shaft and the second transmission shaft can rotate relative to each other; a position restricting member, provided on the distal side to the first rotation joint, for allowing the first transmission shaft to move in a longitudinal direction of the inserting part within the inserting part; a third link part connected to the therapeutic pad; a fourth link part provided proximal of the third link part, and connected to the manipulating part; third transmission shafts including two shafts, connected to the third link part; fourth transmission shafts including as many shafts as the third transmission shafts, connected to the fourth link part; and second rotation joints for connecting each shaft of the third transmission shafts to a corresponding shaft of the fourth transmission shafts such that each shaft of the third transmission shafts and the corresponding shaft of the fourth transmission shafts can rotate relative to each other, wherein: the movable portion of the therapeutic part is turnable and has an openable and closable gripping mechanism, the manipulating part having an openable, closable and turnable structure, the open and close movements of the manipulating part are transmitted to the therapeutic part through the second link part, the second transmission shaft, the first rotation joint, the first transmission shaft and the first link part to make the therapeutic part open and close, and the rotation movements of the manipulating part are transmitted to the therapeutic part through the fourth link part, the fourth transmission shafts, the second rotation joints, the third transmission shafts and the third link part to make the therapeutic part rotate.