US 11,925,375 B2
Medical instrument and method
Janosz Schneider, Tuttlingen (DE); Jochen Stefan, Tuttlingen (DE); Daniel Kärcher, Tuttlingen (DE); Robin Merz, Tuttlingen (DE); Sven Axel Grüner, Tuttlingen (DE); Martin Blocher, Tuttlingen (DE); Sven Schneider, Tuttlingen (DE); Tobias Unger, Tuttlingen (DE); Dominik Längle, Tuttlingen (DE); Judith Holzer, Tuttlingen (DE); and Sebastian Wagner, Tuttlingen (DE)
Assigned to KARL STORZ SE & Co. KG, Tuttlingen (DE)
Appl. No. 18/014,800
Filed by KARL STORZ SE & Co. KG, Tuttlingen (DE)
PCT Filed Jul. 5, 2021, PCT No. PCT/EP2021/068525
§ 371(c)(1), (2) Date Jan. 6, 2023,
PCT Pub. No. WO2022/008453, PCT Pub. Date Jan. 13, 2022.
Claims priority of application No. 102020117962.6 (DE), filed on Jul. 8, 2020.
Prior Publication US 2023/0210548 A1, Jul. 6, 2023
Int. Cl. A61B 17/29 (2006.01); A61B 17/00 (2006.01)
CPC A61B 17/2909 (2013.01) [A61B 2017/0046 (2013.01); A61B 2017/00862 (2013.01); A61B 2017/2912 (2013.01); A61B 2017/292 (2013.01); A61B 2017/2946 (2013.01)] 18 Claims
OG exemplary drawing
 
1. 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 the at least one winding of the at least one leg spring is tightly wrapped around the pin such that the at least one leg spring in the rest state cannot be rotated about the pin due to friction, 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.