Anchor for an implant assembly
A medical device includes an implant anchor comprising first and second opposing end portions. The implant anchor may also include a fixation element to configured to couple the implant anchor to an implant, and an anchor element configured to couple the implant anchor to bone. At least a portion of the implant anchor has a porous structure.
1. A medical device, comprising:
an implant anchor comprising first and second opposing end portions, said implant anchor further comprising:
a fixation element to configured to couple said implant anchor to an implant; and
an anchor element comprising a threaded shank configured to couple said implant anchor to bone, said threaded shank comprising a screw thread;
wherein at least a portion of said screw thread has a porous structure.
2. The medical device of claim 1 , wherein:
said fixation element has a non-porous-structure.
3. The medical device of claim 1 , wherein:
said second end portion of said implant anchor comprises said anchor element.
4. The medical device of claim 1 , wherein:
at least a portion of said threaded shank is formed by said porous structure.
5. The medical device of claim 4 , wherein:
a portion of said screw thread is formed by a non-porous structure.
6. The medical device of claim 4 , wherein:
said threaded shank of said implant anchor comprises a shank root; and
at least a portion of said shank root is formed by said porous structure.
7. The medical device of claim 1 , wherein:
said porous structure is formed by metal particles.
8. The medical device of claim 1 , wherein:
said porous structure is formed by a plurality of layers of metal particles.
9. The medical device of claim 8 , wherein:
said metal particles comprise metal powder.
10. The medical device of claim 1 , wherein:
said porous structure comprises a skeletal framework and a plurality of interstices arranged in an orderly geometric pattern of repeating unit cells.
11. The medical device of claim 10 , wherein:
said repeating cell unit is a dodecahedron.
12. The medical device of claim 10 , wherein:
said skeletal framework is formed by a plurality of struts; and
said struts have a thickness in a range of 150 μm to 300 μm.
13. The medical device of claim 10 , wherein:
said interstices have a size in a range of 240 μm to 730 μm.
14. The medical device of claim 10 , wherein:
said porous structure has a porosity in a range of 55% to 75%.
15. The medical device of claim 10 , wherein:
said porous structure comprises a plurality of layers.
16. The medical device of claim 15 , wherein:
said plurality of layers form a three-dimensional, multi-layered mesh or lattice structure.
17. The medical device of claim 10 , wherein:
said porous structure forms at least a portion of a threaded shank.
18. The medical device of claim 17 , wherein:
said porous structure forms a shank root of said threaded shank.
19. The medical device of claim 1 , further comprising an implant configured to be coupled said implant anchor.
20. The medical device of claim 19 , wherein said implant includes a load bearing surface, a bone facing surface, and a fixation element configured to be coupled to said fixation element of said implant anchor.
21. The medical device of claim 20 , wherein said fixation elements of said implant and said implant anchor include mating tapered surfaces configured to form a frictional connection therebetween.
22. The medical device of claim 1 , wherein said implant anchor includes a longitudinally disposed passageway extending between said first and said second opposing end portions.
23. A medical device, comprising:
an implant including a load bearing surface, a bone facing surface, and a first fixation element; and
an implant anchor comprising first and second opposing end portions, said implant anchor further comprising:
a second fixation element to configured to engage said first fixation element to couple said implant anchor to an implant; and
an anchor element comprising a screw thread having configured to couple said implant anchor to bone;
wherein at least a portion of said screw thread has a porous structure.
24. The medical device of claim 23 , wherein said implant anchor includes a longitudinally disposed passageway.
25. A medical device, comprising:
an implant anchor, wherein said implant anchor comprises first and second opposing end portions;
wherein said first end portion of said implant anchor comprises a fixation element to connect said implant anchor to an implant; and
wherein said second end portion of said implant anchor comprises a screw thread having a porous structure to connect said anchor to bone.
26. The medical device of claim 25 , wherein said implant anchor includes a longitudinally disposed passageway extending between said first and said second opposing end portions.