Patent ID: 11925375
Assignee: KARL STORZ SE & CO. KG
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 14:
15. A medical instrument, having an elongated shaft, a movable tool at a distal end of the shaft, a handle with a movable grip part at a proximal end of the shaft, and a force transmission element which can be moved in the longitudinal direction of the instrument and is operatively connected to the movable grip part and to the tool such that an actuation of the movable grip part is converted into a movement of the tool, and having a spring assembly that is arranged on the handle and has at least one leg spring, which has at least one winding and two legs, and a pin, wherein the at least one winding extends about the pin, wherein when the movable grip part is actuated, a force is applied to at least one of the legs of the at least one leg spring, said force reducing the friction between the at least one winding and the pin such that the at least one leg spring can be rotated about the pin and the force transmission element and the tool can be moved, whereas when a force is transmitted from the tool to the force transmission element in the longitudinal direction thereof, the at least one leg spring cannot be rotated about the pin such that the force transmission element and the tool cannot be moved, wherein the longitudinal movement of the force transmission element and the movement of the tool is locked both when the force acting via the tool on the force transmission element is directed distally and when the force acting via the tool on the force transmission element is directed proximally.