Composite orthopedic implant having a low friction material substrate with primary frictional features and secondary frictional features
View Patent ↗An orthopedic implant comprising a substrate material adapted to provide the orthopedic implant. The implant has a primary friction area located on or integral with the substrate material. The primary friction area defining an engagement surface having a primary frictional feature. A secondary friction area is located on or integral with the engagement surface and defining a second frictional feature. The primary friction area and the secondary friction area defining a friction interface zone between the orthopedic implant and at least one bone. The secondary friction area increases a friction of the engagement surface and modulus of elasticity to enhance the frictional engagement between the engagement surface and the at least one bone.
1. An orthopedic implant comprising:
a substrate material adapted to provide the orthopedic implant;
a primary friction area located on or integral with said substrate material, said primary friction area having a primary surface having a primary frictional feature; and
a secondary friction area located on or integral with said primary surface and defining a secondary frictional feature;
said primary friction area and said secondary friction area defining a friction interface zone, said secondary friction area increasing a friction of said primary surface to enhance a frictional engagement between said primary surface and at least one bone;
wherein said primary frictional feature defines a plurality of primary teeth;
wherein said secondary frictional feature defines a plurality of secondary teeth on or integral with said primary friction area;
wherein at least one of said plurality of primary teeth has at least one surface that does not have said secondary frictional feature;
wherein said primary friction area and said secondary friction area are at least one of machined, molded, extruded or sintered substrate.
2. The orthopedic implant as recited in claim 1 wherein said substrate material is a polymeric substrate.
3. The orthopedic implant as recited in claim 1 wherein said secondary friction area comprises at least one of a microscopically or macroscopically rough surface.
4. The orthopedic implant as recited in claim 1 wherein said secondary friction area is regular in shape.
5. The orthopedic implant as recited in claim 1 wherein said secondary friction area is irregular in shape.
6. The orthopedic implant as recited in claim 1 wherein said substrate material is made from a thermoplastic.
7. The orthopedic implant as recited in claim 6 wherein said thermoplastic is a polyetheretherketone (PEEK).
8. The orthopedic implant as recited in claim 1 wherein a modulus of elasticity of said substrate material is less than or equivalent to bone.
9. The orthopedic implant as recited in claim 8 wherein said substrate material has a low coefficient of friction with bone.
10. The orthopedic implant as recited in claim 8 wherein at least one of said primary friction area or said secondary friction area has a modulus of elasticity that the same as or greater than bone.
11. The orthopedic implant as recited in claim 1 wherein at least one of said primary friction area or said secondary friction area being made from a metal or metallic alloy.
12. The orthopedic implant as recited in claim 1 wherein at least one of said primary friction area or said secondary friction area having a modulus of elasticity that is the same as or greater than bone.
13. The orthopedic implant as recited in claim 1 wherein at least one of said primary friction area or said secondary friction area comprising a higher coefficient of friction with bone.
14. The orthopedic implant as recited in claim 13 wherein at least one of said primary friction area or said secondary friction area has a modulus of elasticity that is the same as or greater than bone.
15. The orthopedic implant as recited in claim 1 wherein said primary friction area comprising a higher coefficient of friction with bone and said secondary friction area comprising a higher coefficient of friction than said primary friction area.
16. The orthopedic implant as recited in claim 1 wherein said primary friction area having a modulus of elasticity that is the same as or greater than bone and said secondary friction area having a modulus of elasticity that is the same or greater than said primary friction area.
17. The orthopedic implant as recited in claim 1 wherein said secondary frictional feature is integral with or welded to said primary frictional feature.
18. The orthopedic implant as recited in claim 1 wherein said plurality of secondary teeth comprise points or peaks on or integral with said plurality of primary teeth.
19. The orthopedic implant as recited in claim 18 wherein said plurality of primary teeth are neither regular nor symmetrical.
20. The orthopedic implant as recited in claim 18 wherein said plurality of primary teeth are regular and symmetrical.
21. The orthopedic implant as recited in claim 1 wherein said primary frictional feature and said secondary frictional feature are made from different materials.
22. The orthopedic implant as recited in claim 1 wherein said primary frictional feature and said secondary frictional feature are made from the same materials.
23. The orthopedic implant as recited in claim 1 wherein at least one of said primary frictional feature, said secondary frictional feature or said substrate material is made from a different material than the others.
24. The orthopedic implant as recited in claim 1 wherein said secondary frictional feature increases a coefficient of friction of said orthopedic implant and bone.
25. The orthopedic implant as recited in claim 1 wherein said orthopedic implant is a spinal implant.
26. The orthopedic implant as recited in claim 25 wherein said spinal implant is a cage.
27. An orthopedic implant comprising:
a body comprising a composite material;
a first friction area situated between the body and bone of a patient when the orthopedic implant is implanted in the patient, said first friction area comprising a plurality of primary teeth having generally the same shape; and
a second friction area associated with said first friction area for directly engaging said bone;
wherein said second friction area defines a plurality of secondary teeth on or integral with said first friction area, at least one of said plurality of primary teeth has a surface that is not co-planar with said first friction area and that does not have said second friction area thereon;
each of said first and second friction areas for improving a frictional engagement between said bone and said orthopedic implant;
wherein said first friction area and said second friction area are at least one of machined, molded, extruded or sintered.
28. The orthopedic implant as recited in claim 27 wherein said body and said first friction area each have a modulus of elasticity that is lower than a modulus of elasticity of said second friction area.
29. The orthopedic implant as recited in claim 27 wherein said second friction area defines a frictional engaging surface that increases a coefficient of friction between said first friction area and said bone.
30. The orthopedic implant as recited in claim 27 wherein said body is made from a polymeric material, and at least one of said first or second friction areas comprises a metallic or metallic alloy.
31. The orthopedic implant as recited in claim 27 wherein said plurality of secondary teeth of said second friction area is uninterrupted.
32. The orthopedic implant as recited in claim 27 wherein said composite material is made from a thermoplastic.
33. The orthopedic implant as recited in claim 27 wherein said thermoplastic is a polyetheretherketone (PEEK).
34. The orthopedic implant as recited in claim 27 wherein a modulus of elasticity of said composite material is less than or equivalent to bone.
35. The orthopedic implant as recited in claim 34 wherein a coefficient of friction associated with said composite material and bone is lower than a coefficient of friction between said second friction area and said bone.
36. The orthopedic implant as recited in claim 34 wherein each of said first friction area and said second friction area comprise a higher coefficient of friction with bone.
37. The orthopedic implant as recited in claim 27 wherein each of said first friction area and said second friction area are made from a metal or metallic alloy and said body is made of a polymer.
38. The orthopedic implant as recited in claim 27 wherein each of said first friction area or said second friction area have a modulus of elasticity that is the same as or greater than bone.
39. The orthopedic implant as recited in claim 27 wherein said second friction area is integral with, welded to, adhered to said first friction area.
40. The orthopedic implant as recited in claim 27 wherein said plurality of secondary teeth of said second friction area define a plurality of points or peaks on said first friction area.
41. The orthopedic implant as recited in claim 40 wherein said plurality of points or peaks are neither regular nor symmetrical.
42. The orthopedic implant as recited in claim 40 wherein said plurality of points or peaks are regular and symmetrical.
43. The orthopedic implant as recited in claim 27 wherein said orthopedic implant is a spinal implant.
44. The orthopedic implant as recited in claim 43 wherein said spinal implant is a cage.