Method for the manufacture of a tubular spacer and spacer
A tubular spacer and a method for the manufacture of the spacer is described. The tubular spacer has a first rim on a first end, a second rim on its opposite second end, and a jacket extending between said first and said second rims. The jacket has a tapered section adjacent to at least one end. The spacer is suitable for use in tubular bone surgery where it is necessary that the spacer adapts to different bone cross-sections. To make this tubular spacer, a cylinder having a tubular jacket body is expanded and/or narrowed at one or both of its ends. Methods for using the spacer as well as kits for making the spacers are described.
1. A spacer for bone defects comprising a tubular body having a first end, a first rim at the first end, a second end, a second rim at the second end, a longitudinal axis, an unthreaded jacket wall extending in the direction of said longitudinal axis from said first rim to said second rim, said jacket wall having a first body section adjacent the first rim and a second body section adjacent the second rim, wherein said first body section has a tapered shape, wherein the jacket wall comprises a plurality of recesses.
2. The spacer of claim 1 , wherein the recesses are rhomboid shaped recesses.
3. The spacer of claim 2 , wherein the rhomboid-shaped recesses are arranged in groups such that the recesses in a group are adjacent to each other in the direction of the circumference.
4. The spacer according to claim 3 , wherein the jacket wall comprises the shape of a rhomboid lattice.
5. The spacer of claim 1 , wherein the tapered shape diverges from the longitudinal axis in a direction of the first end.
6. The spacer of claim 1 , wherein the tapered shape converges toward the longitudinal axis in a direction of the first end.
7. The spacer according to claim 1 , wherein said second body section has a tapered shape and wherein the tapered shape of the first body section diverges from the longitudinal axis in a direction of the first end and wherein the tapered shape of the second body section converges toward the longitudinal axis in a direction of the first end.
8. A method for connecting two bone parts, the method comprising:
providing a length of tubular spacer sufficient to connect the bone parts, the spacer comprising a tubular body having a first end, a first rim at the first end, a second end, a second rim at the second end, a longitudinal axis, a jacket wall extending in the direction of said longitudinal axis from said first rim to said second rim, said jacket wall having a first body section adjacent the first rim and a second body section adjacent the second rim, wherein said first body section is tapered;
inserting the length of tubular spacer between the bone parts to be connected; and
applying a compression force to the tubular spacer positioned between the two bone parts
wherein the step of providing a length of tubular spacer comprises:
providing cylindrical tubular jacket material;
cutting the cylindrical tubular jacket material to said length; and
expanding or narrowing at least one of the first and second ends of the tubular spacer to adjust to the bone parts being connected.
9. The method according to claim 8 , comprising a step of filling the spacer with bone chips or artificial material.
10. The method according to claim 8 , wherein the expanding or narrowing step comprises expanding a rim of the tubular body.
11. The method according to claim 8 , wherein the expanding or narrowing step comprises expanding a section of the body adjacent to the first rim with the expansion commencing at the first end.
12. The method according to claim 8 , wherein the expanding or narrowing step comprises narrowing a rim of the tubular body.
13. The method according to claim 8 , wherein the expanding or narrowing step comprises narrowing a section of the body adjacent to the first rim with the expansion commencing at the first end.
14. The method according to claim 8 , wherein the expanding or narrowing step comprises expanding the first rim of the tubular body and narrowing the second rim of the tubular body.
15. The method according to claim 8 , wherein the expanding or narrowing step comprises expanding a first section of the body adjacent to the first rim with the expansion commencing at the first end and narrowing a second section of the body adjacent to the second rim with the expansion commencing at the second end.
16. The method according to claim 8 , wherein the expanding or narrowing step comprises expanding a first section of the body adjacent to the first rim with the expansion commencing at the first end and expanding a second section of the body adjacent to the second rim with the expansion commencing at the second end.
17. The method according to claim 8 , wherein the expanding or narrowing step comprises narrowing a first section of the body adjacent to the first rim with the expansion commencing at the first end and narrowing a second section of the body adjacent to the second rim with the expansion commencing at the second end.
18. The method according to claim 8 , further comprising shaping a cross-section of the first rim to differ from a cross-section of the second rim.
19. The method according to claim 8 , wherein the expanding or narrowing step comprises expanding a first section of the body by pushing-in a mandrel.
20. The method according to claim 8 , wherein the expanding or narrowing step comprises expanding a first section of the body by pushing the first end into a hollow die.