| 摘要 |
An insertion instrument for joint sockets of prosthesis that uses vacuum suction is disclosed. The instrument comprises an elongated shaft (1), a suction head (2) provided at front end for connection to the joint socket, a suction device with a piston guided in the shaft (1), a suction duct which merges into the suction head and an actuating element which is guided along a guide track (14). The guiding track (14) is helically formed and comprises a locking device, in the form of recess (15) for the actuating element in a suction position. Due to the helical form of the guiding track (14), the actuating element executes a rotational and longitudinal movement during its displacement. The longitudinal movement produces a negative pressure in the suction duct, thereby ensuring the maintenance of said pressure, while the rotating movement causes the rotation of the actuating element to an extent that it reaches its locking position at the end of the guiding track (14).
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