Insertion instrument for an endoprosthesis comprising a prosthesis shaft which is to be inserted into a medullary cavity

1. A combination surgical instrument and endoprosthesis comprising:

an endoprosthesis having a neck part with a cone, a shaft part to be inserted into a medullary cavity, an end face on the cone, and recesses on the end face of the cone;

an instrument having a clamping device with a holding fork and a thrust bearing, a striker device, a striking element, and a guide rail for the striking element; and

position markers for rotationally positioning the endoprosthesis, the position markers including projections on the thrust bearing positioned to engage the recesses on the end face of the cone when clamped by the clamping device for inserting the endoprosthesis.

2. A combination according to claim 1 , wherein the holding fork and clamping device are configured to hold the endoprosthesis fixedly in a clamped state and to release it in an unclamped state.

3. A combination according to claim 1 , wherein the cone is taken up in a seat of the holding fork when clamped by the clamping device.

4. A combination according to claim 1 , wherein the thrust bearing cooperates with the end face of the cone when the cone is clamped between the thrust bearing and the seat of the holding fork.

5. An insertion instrument and endoprosthesis combination comprising:

the endoprosthesis having

a shaft part to be inserted into a medullary cavity,

a collar,

a striking face at the collar,

a neck part having a cone with an end face, and

recesses on the end face of the cone; and

the instrument having

a clamping device with a holding fork and a thrust bearing, which are designed to hold the endoprosthesis fixedly in a clamped state and to release it in an unclamped state,

a striker device, and

a guide rail for a striking element arranged in a fixed manner on the clamping device and oriented so that a path determined by the guide rail leads to the striking face at the collar when the endoprosthesis is clamped in the clamping device,

wherein the cone is taken up in a seat of the holding fork,

wherein the thrust bearing cooperates with the end face of the cone for clamping the cone between the thrust bearing and the seat of the holding fork, and

wherein position markers for a correct angular positioning of the endoprosthesis are provided on the thrust bearing as projections that engage in the recesses on the end face of the cone in the clamped state.

6. An insertion instrument according to claim 5 , wherein the guide rail is closed.

7. An insertion instrument according to claim 6 , wherein the guide rail is a tube.

8. An insertion instrument according to claim 5 , wherein the seat has a depth of less than 2 mm.

9. An insertion instrument according to claim 5 , wherein the striking element is a ram inserted into the guide rail.

10. An insertion instrument according to claim 9 , wherein the ram has a handle on its back end away from the endoprosthesis.

11. An insertion instrument according to claim 10 , wherein the handle has a striking surface.

12. An insertion instrument according to claim 9 , wherein the ram has a rounded tip.

13. An insertion instrument according to claim 9 , wherein a recoil damper is provided for the ram.

14. An insertion instrument according to claim 13 , wherein the recoil damper is designed as an O-ring arranged in a peripheral groove.

15. An insertion instrument according to claim 9 , wherein the ram is segmented, whereby one segment has a smaller cross-section than the other segment.

16. An insertion instrument according to claim 5 , wherein the projections are about 0.1 mm to about 1 mm longer than the depths of the recesses.

17. An insertion instrument according to claim 5 , wherein the seat has a depth of less than 1 mm.