Coated joint endoprosthesis
Joint endoprostheses are provides which respectively have a joint part with a metallic core, wherein the metallic core is coated, in regions that roll and/or slide on another joint part during execution of the joint function, with a glass-ceramic composite mixture. In one embodiment, the glass-ceramic has the following composition with approximate amounts in wt. %: Component Amount (wt %) SiO 2 45–50% Al 2 O 3 15–20% ZrO 2 8–12% K 2 O 0–8% Na 2 O 0–7.5% CaO 0–2.5% TiO 2 0–1.5% and furthermore a residual amount of up to about 12.5% of MnO 2 and/or Fe 2 O 3 and/or Co 2 O 3 .
1. A joint endoprosthesis, comprising a first joint part having a metallic core, wherein the metallic core is coated, in regions that roll and/or slide on a second joint part during execution of a joint function, with a glass-ceramic composite mixture having the following composition in approximate amounts indicated (in wt. %):
Component
Amount (wt %)
SiO 2
45–50%
Al 2 O 3
15–20%
ZrO 2
8–12%
K 2 O
0–8%
Na 2 O
0–7.5%
CaO
0–2.5%
TiO 2
0–1.5%
and furthermore a residual amount of up to about 12.5% of an oxide selected from the group consisting of MnO 2 , Fe 2 O 3 , Co 2 O 3 and mixture thereof.
2. A joint endoprosthesis, comprising a first joint part having a metallic core, wherein the metallic core is coated, in regions that roll and/or slide on a second joint part during execution of a joint function, with a glass-ceramic composite mixture having the following composition in approximate amounts indicated (in wt. %):
Component
Amount (wt %)
SiO 2
35–55%
Al 2 O 3
15–25%
TiO 2
10–14%
Na 2 O
0–7.5%
K 2 O
0–7%
ZrO 2
1–5%
CaO
0–0.5%
and furthermore a residual amount of up to about 24% of and oxide selected from the group consisting of MnO 2 , Fe 2 O 3 , Co 2 O 3 , CuO, and mixtures thereof.
3. A joint endoprosthesis, comprising a first joint part having a metallic core, wherein the metallic core is coated, in regions that roll and/or slide on a second joint part during execution of a joint function, with a glass-ceramic composite mixture having the following composition in approximate amounts indicated (in wt. %):
Component
Amount (wt %)
SiO 2
50–60%
Al 2 O 3
5–10%
ZrO 2
5–10%
Na 2 O
0–8%
CaO
0–6%
TiO 2
3–5%
K 2 O
0–2%
Sb 2 O 3
0–0.5%
and furthermore a residual amount of up to about 20.5% of and oxide selected from the group consisting of MnO 2 , Fe 2 O 3 , Co 2 O 3 , CuO, CeO 2 , and mixtures thereof.
4. The joint endoprosthesis according to claim 1 , wherein the coating has a thickness of about 200 to 600 μm.
5. The joint endoprosthesis according to claim 2 , wherein the coating has a thickness of about 200 to 600 μm.
6. The joint endoprosthesis according to claim 3 , wherein the coating has a thickness of about 200 to 600 μm.
7. The joint endoprosthesis according to claim 1 , wherein the second joint part also has a metallic core which is coated with a glass-ceramic composite mixture of the same composition as the first joint part.
8. The joint endoprosthesis according to claim 2 , wherein the second joint part also has a metallic core which is coated with a glass-ceramic composite mixture of the same composition as the first joint part.
9. The joint endoprosthesis according to claim 3 , wherein the second joint part has a sliding partner comprising a ceramic.
10. The joint endoprosthesis according to claim 3 , wherein the second joint part has a sliding partner comprising polyethylene.
11. The joint endoprosthesis according to claim 1 , wherein the metallic core comprises a cobalt-chromium-molybdenum alloy.
12. The joint endoprosthesis according to claim 2 , wherein the metallic core comprises a cobalt-chromium-molybdenum alloy.
13. The joint endoprosthesis according to claim 3 , wherein the metallic core comprises a cobalt-chromium-molybdenum alloy.
14. The joint endoprosthesis according to claim 7 , wherein the metallic core of the second joint part comprises a cobalt-chromium-molybdenum alloy.
15. The joint endoprosthesis according to claim 8 , wherein the metallic core of the second joint part comprises a cobalt-chromium-molybdenum alloy.