Claims
- 1. A composite biotic implant prepared by a process comprising:
- placing ceramic particles made of diopside, wollastonite or combination thereof, having a mean particle size ranging from 1 to 5,000 .mu.m and having an average shape factor of up to 2 on a surface layer of a metal substrate; and
- embedding said ceramic particles in the metal substrate to the extent of 40-75% of the ceramic particle size by plastic working, thereby forming an embedment layer, said composite implant having a surface roughness Ra ranges from 1 to 2,000 .mu.m.
- 2. The composite biotic implant of claim 1, wherein said metal of said metal substrate has a ductility of at least 50% at a temperature corresponding to 70% or less of its melting point.
- 3. The composite biotic implant of claim 1, wherein said ceramic particles exhibit bio-compatibility.
- 4. The composite biotic implant of claim 1, wherein said ceramic particles exhibit bio-affinity.
- 5. The composite biotic implant of claim 1, wherein the coverage of the biotic contact surface of the metal substrate with said ceramic particles is at least 20%.
- 6. The composite biotic implant of claim 1, wherein said ceramic particles have a coefficient of thermal expansion which is lower than the coefficient of thermal expansion of the metal substrate multiplied by a factor of 0.5 to 1.5.
- 7. The composite biotic implant of claim 1, wherein a layer of a bio-compatible ceramic material is coated over the embedment layer.
- 8. The composite biotic implant of claim 7, wherein said embedment layer and said coating layer have a combined thickness of 1 to 5,000 .mu.m.
- 9. The composite biotic implant of claim 7, wherein the ceramic material of said coating layer is a bio-active, phosphate sintered ceramic material which has a composition prepared from SiO.sub.2 and at least one oxide selected from the group consisting of alkaline earth metal oxides and alkali metal oxides and which can precipitate a calcium phosphate compound on a surface from an aqueous solution containing phosphate.
- 10. The composite biotic implant of claim 7, wherein the ceramic material of which said coating layer is formed is diopside, wollastonite or combination thereof.
- 11. The composite biotic implant of claim 9, wherein said ceramic material of the coating layer is substantially free of phosphorous.
- 12. The composite biotic implant of claim 9, wherein said ceramic material of the coating layer has a composition prepared from alkaline earth metal oxide and SiO.sub.2, the weight ratio of SiO.sub.2 to alkaline earth metal oxide ranging from 1:4 to 6:1.
- 13. The composite biotic implant of claim 12, wherein said alkaline earth metal oxide is at least one member selected from the group consisting of CaO and MgO.
- 14. The composite biotic implant of claim 1, wherein said plastic working is effected at 700.degree. to 1,200.degree. C. and at a pressure of 1 to 500 MPa.
- 15. The composite biotic implant of claim 7, wherein said coating layer is a porous ceramic coating layer which has an average pore diameter of 10 to 100 .mu.m and a porosity of 10 to 70%.
- 16. The composite biotic implant of claim 1, wherein said ceramic particles are embedded in said metal substrate to the extent of 40-70% of said particle size.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3-045676 |
Feb 1991 |
JPX |
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Parent Case Info
This application is a Continuation of application Ser. No. 08/251,635, filed on May 31, 1994, now abandoned, which is a Continuation of application Ser. No. 07/839,391 filed Feb. 20, 1992, now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0 006 544 |
Jan 1980 |
EPX |
0 023 608 |
Feb 1981 |
EPX |
0 280 592 |
Aug 1988 |
EPX |
WO 87 06842 |
Nov 1987 |
WOX |
Non-Patent Literature Citations (1)
Entry |
M. Toriyama, et al., pp. 1268-12270, 1991, "Alpha-Tricalcium Phosphate Coating on Titanium". |
Continuations (2)
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Number |
Date |
Country |
Parent |
251635 |
May 1994 |
|
Parent |
839391 |
Feb 1992 |
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