Medical instrument

1. A medical instrument, comprising:

a shaft having an outer shaft and an inner shaft, said outer shaft enclosing said inner shaft, said outer shaft having a longitudinal axis and a proximal end region,

an actuator for rotating said inner shaft about said longitudinal axis relative to said outer shaft, said actuator being arranged at said proximal end region of said outer shaft and being rotatable about said longitudinal axis,

at least two tappet elements operatively connected with said actuator for transfer-ring a rotary movement of said actuator to said inner shaft, said at least two tappet elements being engaged alternatingly with respect to one another with said inner shaft for transferring said rotary movement of said actuator to said inner shaft, said at least two tappet elements reaching through peripherally limited openings in said proximal end region of said outer shaft, said openings being offset with respect to one another in direction of said longitudinal axis.

2. The instrument of claim 1 , wherein adjacent to said openings of said outer shaft said outer shaft has control cams for said at least two tappet elements, which control cams serve for alternate disengagement and engagement of said at least two tappet elements with said inner shaft.

3. The instrument of claim 2 , wherein said control cams have a full circumference and are distanced radially from said inner shaft in sections which are not immediately adjacent to said openings such that said at least two tappet elements are disengaged from said inner shaft.

4. The instrument of claim 1 , wherein said at least two tappet elements are arranged peripherally offset.

5. The instrument of claim 1 , wherein said at least two tappet elements are designed in each case in two parts, wherein a first tappet element part and a second tappet element part of said at least two tappet elements are supplied with resilient force, wherein said first tappet element part and said second tappet element part can be moved in a radial direction of said shaft relative to one another.

6. The instrument of claim 1 , wherein said at least two tappet elements extend in a radial direction with respect to said shaft.

7. The instrument of claim 1 , wherein said inner shaft has at least one recess for accommodating said at least two tappet elements.

8. The instrument of claim 7 , wherein said recess is designed as a groove running in direction of said longitudinal axis.

9. The instrument of claim 1 , wherein said openings of said outer shaft are designed as slots.

10. The instrument of claim 1 , comprising exactly said two tappet elements, wherein said openings of said outer shaft are designed approximately semi-peripherally.

11. The instrument of claim 10 , wherein said two tappet elements are arranged offset peripherally by approximately 180 degree.

12. The instrument of claim 10 , wherein said two tappet elements are arranged axially adjacent.

13. A medical instrument, comprising:

a shaft having an outer shaft and an inner shaft, said outer shaft enclosing said inner shaft, said outer shaft having a longitudinal axis and a proximal end region,

an actuator for rotating said inner shaft about said longitudinal axis relative to said outer shaft, said actuator being arranged at said proximal end region of said outer shaft,

at least two tappet elements operatively connected with said actuator for transferring a rotary movement of said actuator to said inner shaft, said at least two tappet elements being engaged alternatingly with respect to one another with said inner shaft for transferring said rotary movement of said actuator to said inner shaft, said at least two tappet elements reaching through peripherally limited openings in said proximal end region of said outer shaft, said openings being offset with respect to one another in direction of said longitudinal axis,

said outer shaft having control cams adjacent to said openings of said outer shaft for said at least two tappet elements, said control cams serve for alternate disengagement and engagement of said at least two tappet elements with said inner shaft,

said control cams having a full circumference and are distanced radially from said inner shaft in sections which are not immediately adjacent to said openings such that said at least two tappet elements are disengaged from said inner shaft.

14. The instrument of claim 13 , wherein said at least two tappet elements are arranged peripherally offset.

15. The instrument of claim 13 , wherein said at least two tappet elements are designed in each case in two parts, wherein a first tappet element part and a second tappet element part of said at least two tappet elements are supplied with resilient force, wherein said first tappet element part and said second tappet element part can be moved in a radial direction of said shaft relative to one another.

16. The instrument of claim 13 , wherein said at least two tappet elements ex-tend in a radial direction with respect to said shaft.

17. The instrument of claim 13 , wherein said inner shaft has at least one recess for accommodating said at least two tappet elements.

18. The instrument of claim 17 , wherein said recess is designed as a groove running in direction of said longitudinal axis.

19. The instrument of claim 13 , wherein said openings of said outer shaft are designed as slots.

20. The instrument of claim 13 , comprising exactly said two tappet elements, wherein said openings of said outer shaft are designed approximately semi-peripherally.

21. The instrument of claim 20 , wherein said two tappet elements are arranged offset peripherally by approximately 180 degree.

22. The instrument of claim 20 , wherein said two tappet elements are arranged axially adjacent.