Multi-walled placeholder

1. A placeholder for implantation in a human or animal body, he placeholder comprising:

a first tubular body having a jacket surface with a plurality of openings, a first end, and a second end opposite the first end;

a second tubular body having a jacket surface with a plurality of openings, the second tubular body disposed at least partially inside the first tubular body and having a first end and a second end opposite the first end of the second tubular body; and

a retaining plate configured to be arranged transverse to a longitudinal axis of the first tubular body and connect the first and second tubular bodies to each other, the retaining plate having a plurality of openings,

wherein each of the first and second tubular bodies has at least one projection receivable in at least one opening of the plurality of openings of the retaining plate.

2. The placeholder in accordance with claim 1 , wherein the at least one projection of each of the first and second tubular bodies is configured to protrude through the at least one opening of the retaining plate.

3. The placeholder in accordance with claim 1 , wherein the retaining plate has an annular disc shape.

4. The placeholder in accordance with claim 3 , wherein the retaining plate has a slit and is configured to be elastically pressed from a first configuration in which the slit has a first width to a second configuration in which the slit has a second width less than the first width and the at least one projection of each of the first and second tubular bodies is receivable in the at least one opening of the retaining plate such that the at least one projection of each of the first and second tubular bodies is held against an edge of the at least one opening of the retaining plate non-positively or by friction via an elastic recovery force.

5. A placeholder for implantation in a human or animal body, the placeholder comprising:

a first tubular body having a jacket surface with a plurality of openings, a first end, and a second end opposite the first end;

a second tubular body having a jacket surface with a plurality of openings, the second tubular body disposed at least partially inside the first tubular body and having a first end and a second end opposite the first end of the second tubular body; and

at least one spacer;

wherein the second tubular body is spaced apart with the at least one spacer from the first tubular body in a direction transverse to a longitudinal axis of the first tubular body to promote in-growth of body tissue between the first and second tubular bodies,

wherein the first and second tubular bodies each have, at least at one of the ends, projections and indentations,

wherein the first and second tubular bodies are configured to concurrently contact a vertebra or vertebral disc at the first end of each of the first and second tubular bodies and an adjacent vertebra or vertebral disc at the second end of each of the first and second tubular bodies;

wherein the at least one spacer comprises a connecting, element configured to connect the first tubular body to the second tubular body,

wherein the first tubular body and the second tubular body are detachably connected to each other via the connecting element, and

wherein the connecting element comprises at least one retaining plate.

6. The placeholder in accordance with claim 5 , wherein the at least one retaining plate comprises an end plate formed as a slit ring for spring loading.

7. A placeholder for implantation in a human or animal body, the placeholder comprising:

a first tubular body having a jacket surface with a plurality of openings, a first end, and a second end opposite the first end;

a second tubular body having a jacket surface with a plurality of openings, the second tubular body disposed at least partially inside the first tubular body and having a first end and a second end opposite the first end of the second tubular body; and

at least one spacer;

wherein the second tubular body is spaced apart with the at least one spacer from the first tubular body in a direction transverse to a longitudinal axis of the first tubular body to promote in-growth of body tissue between the first and second tubular bodies,

wherein the first and second tubular bodies each have, at least at one of the ends, projections and indentations,

wherein the first and second tubular bodies are configured to concurrently contact a vertebra or vertebral disc at the first end of each of the first and second tubular bodies and an adjacent vertebra or vertebral disc at the second end of each of the first and second tubular bodies,

wherein the at least one spacer comprises a connecting element configured to connect the first tubular body to the second tubular body, and

wherein the connecting element comprises at least one retaining plate arranged transverse to the longitudinal axis of the first tubular body and has a plurality of openings.

8. The placeholder in accordance with claim 7 , wherein the first and second tubular bodies are concentric.

9. The placeholder in accordance with claim 7 , wherein the first tubular body and the second tubular body are detachably connected to each other via the connecting element.

10. The placeholder in accordance with claim 7 , wherein the at least one retaining plate arranged transverse to the longitudinal axis of the first tubular body has receivers for retaining the second tubular body by any one of press fit, force fit and connecting pins.

11. The placeholder in accordance with claim 7 wherein the second tubular body is accommodated completely in the first tubular body.

12. The placeholder in accordance with claim 7 , wherein the openings of the first and second tubular bodies are aligned.

13. The placeholder in accordance with claim 7 , wherein the openings of the first and second tubular bodies are offset relative to each other.

14. The placeholder in accordance with claim 7 , wherein the first and second tubular bodies have different wall thicknesses.

15. The placeholder in accordance with claim 7 , wherein the openings of the first and second tubular bodies are arranged in rows and columns.

16. The placeholder in accordance with claim 7 , wherein the projections and indentations are formed by a cut portion of the respective openings of the first and second tubular bodies.

17. A placeholder for implantation in a human or animal body. the placeholder comprising:

a first tubular body having a jacket surface with a plurality of openings, a first end, and a second end opposite the first end;

a second tubular body having a jacket surface with a plurality of openings, the second tubular body disposed at least partially inside the first tubular body and having a first end and a second end opposite the first end of the second tubular body, and

at least one spacer:,

wherein the second tubular body is spaced apart with the at least one spacer from the first tubular body in a direction transverse to a longitudinal axis of the first tubular body to promote in-growth of body tissue between the first and second tubular bodies,

wherein the first and second tubular bodies each have, at least at one of the ends, projections and indentation

wherein the first and second tubular bodies are configured to concurrently contact a vertebra or vertebral disc at the first end of each of the first and second tubular bodies and an adjacent vertebra or vertebral disc at the second end of each of the first and second tubular bodies

wherein the at least one spacer comprises a connecting element configured to connect the first tubular body to the second tubular body, and

wherein the connecting element comprises at least one retaining plate arranged transverse to the longitudinal axis of the first tubular body and arranged as an end plate at or in a region of a front face of the first tubular body.

18. A placeholder for implantation in a human or animal body the placeholder comprising:

a first tubular body having a jacket surface with a plurality of openings, a first end, and a second end opposite the first end;

a second tubular body haying a jacket surface with a plurality of openings, the second tubular body disposed at least partially inside the first tubular body and having a first end and a second end opposite the first end of the second tubular body; and

at least one spacer;

wherein the second tubular body is spaced apart with the at least one spacer from the first tubular body in a direction transverse to a longitudinal axis of the first tubular body to promote in-growth of body tissue between the first and second tubular bodies.

wherein the first and second tubular bodies each have, at least at one of the ends, projections and indentations,

wherein the first and second tubular bodies are configured to concurrently contact a vertebra or vertebral disc at the first end of each of the first and second tubular bodies and an adjacent vertebra or vertebral disc at the second end of each of the first and second tubular bodies,

wherein the at least one spacer comprises a connecting element configured to connect the first tubular body to the second tubular body, and

wherein the connecting element comprises a plurality of retaining plates, each arranged transverse to the longitudinal axis of the first tubular body and distributed as intermediate plates alone a length of the first tubular body.