Surgical instrument
View Patent ↗A surgical instrument comprising an instrument handle which is linked to a proximal end portion of a tube shaft and at the distal end portion of which an instrument head rotatably supporting an effector is linked so as to be inclinable. The effector includes at least one pivotable engaging element which is operable via an effector operating gear train in cooperation with the instrument handle. The effector operating gear train, in turn, has a pushing rod which is shiftably supported in the tube shaft and which, in the linking area of the instrument head at the tube shaft, abuts a pushing pin shiftably supported in the instrument head, the pushing pin being operatively connected to the engaging element.
1. A surgical instrument comprising an instrument handle linked at a proximal end portion of a tube shaft, the tube shaft having a distal end portion linked to an instrument head supporting an effector rotatable about the longitudinal axis of the tube shaft, the effector being inclinable relative to the tube shaft, wherein the effector further comprises at least one pivotable engaging element operable via an effector operating gear train in cooperation with the instrument handle, wherein the effector operating gear train further comprises a pushing rod shiftably arranged in the tube shaft, and in a linking area between the instrument head and the tube shaft the pushing rod abuts a pushing pin, the pushing pin being shiftably supported in the instrument head and/or the effector and operatively connected to the engaging element.
2. A surgical instrument according to claim 1 , wherein the pushing rod has a distal front face that engages the pushing pin and is chamfered at a predetermined angle.
3. A surgical instrument according to claim 2 , wherein the predetermined angle is approximately 45°.
4. A surgical instrument according to claim 2 , wherein the pushing pin has a ball-shaped pin head engaging the distal front face of the pushing rod.
5. A surgical instrument according to claim 2 , wherein a biasing element forces the pushing pin against the distal front face of the pushing rod.
6. A surgical instrument according to claim 5 , wherein the biasing element is a spring.
7. A surgical instrument according to claim 3 , wherein a biasing element forces the pushing pin against the distal front face of the pushing rod.
8. A surgical instrument according to claim 7 , wherein the biasing element is a spring.
9. A surgical instrument according to claim 2 , wherein the pushing rod and the pushing pin are aligned coaxially to each other when the instrument head is inclined at 0° with respect to the tube shaft.
10. A surgical instrument according to claim 4 , wherein a center of the pin head is located approximately in a pivot axis of the instrument head when the instrument head is inclined at 0° with respect to the tube shaft.
11. A surgical instrument according to claim 2 wherein chamfering at an end of a pushing rod side is aligned approximately perpendicularly to a direction of inclination of the instrument head.