Tool for a medical instrument, and medical instrument

A medical instrument comprising:

• a tool having:
• a stationary component;
• a branch which is pivotable relative to the stationary component about a pivot axis;
• a transmission device for transmitting a force to the pivotable branch;
• a coupling device for coupling the transmission device to the pivotable branch in such a way that a translation of the transmission device entails a pivoting movement of the pivotable branch about its pivot axis;
• wherein the coupling device comprises several coupling portions on the pivotable branch and several corresponding coupling portions on the transmission device;
• wherein two corresponding coupling portions designed as grooves are arranged opposite each other on the transmission device and separated by a wall extending in the direction of the translation;
• wherein each coupling portion on the pivotable branch is assigned to one of the corresponding coupling portions on the transmission device;
• wherein coupling of the pivotable branch and the transmission device is effected by one pair of the coupling portions and one pair of the corresponding coupling portions when the pivotable branch is in a first extreme angle position, and a different pair of the coupling portions and a different pair of the corresponding coupling portions when the pivotable branch is in a second extreme angle position;
• a shaft, which is connected or can be connected to the proximal end of the tool.

A tool for a medical instrument, with:

• a stationary component;
• a branch which is pivotable relative to the stationary component about a pivot axis;
• a transmission device for transmitting a force to the pivotable branch;
• a coupling device for coupling the transmission device to the pivotable branch in such a way that a translation of the transmission device entails a pivoting movement of the pivotable branch about its pivot axis;
• wherein the coupling device comprises several coupling portions on the pivotable branch and several corresponding coupling portions on the transmission device;
• wherein two corresponding coupling portions on the transmission device are separated by a wall extending parallel to the translation;
• wherein each coupling portion on the pivotable branch is assigned to one of the corresponding coupling portions on the transmission device;
• wherein two coupling portions on the pivotable branch comprise a peg or a pin or a rod-shaped portion, extending axially to the pivot axis;
• and
• wherein the coupling of the pivotable branch and the transmission device is effected by one pair of the coupling portions and one pair of the corresponding coupling portions when the pivotable branch is in a first extreme angle position, and a different pair of the coupling portions and a different pair of the corresponding coupling portions when the pivotable branch is in a second extreme angle position.