Patent US2794437A successfully refreshed from Google Patents.
US4146936A
Expired / Lapsed
US
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Implants for bones, joints and tooth roots
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1976-12-29
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Granted: 1979-04-03
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Expires: 1996-12-29
Abstract
Abstract An improved implant for a bone, a joint and tooth root comprising a metallic base material and a coating layer of hydroxyapatite which is formed by thermally sprayed hydroxyapatite powder or a mixture of hydroxyapatite powder and ceramic powder around the outer surface of the metallic base material, optionally a layer of a bonding agent and further a layer of ceramics are formed between the metallic base material and the layer of hydroxyapatite. The implant has a sufficient mechanical strength (e.g. impact strength) and further a good affinity to tissues of living bodies and is useful for implantation in various bones including tooth roots in living bodies.
Inventors
- 👤 Masaya Aoyagi
- 👤 Mikio Hayashi
- 👤 Yasuyuki Yoshida
- 👤 Yoshiaki Yao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:10
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61C; A61C13/00; A61C13/225; A61C13/30; C; C23; C23C; C23C4/00; C23C4/02; A61F2/30767; A61F2002/30929; A61F2310/00; A61F2310/00389; A61F2310/00592; A61F2310/00796; A61L; A61L2430/00; A61L2430/02
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
76 words
An implant for members of living bodies comprising a metallic base material, a layer of a material selected from the group consisting of hydroxyapatite and a mixture of hydroxyapatite and ceramics and a layer of a bonding agent formed between the metallic base material and the layer of hydroxyapatite or a mixture of hydroxyapatite and ceramics, said bonding agent being selected from the group consisting of molybdenum, tantalum, niobium, nickel-chromium-aluminum powdery mixture and nickel-aluminum powdery mixture.
Claim 2
Dependent Claim
76 words
An implant for members of living bodies comprising a metallic base material, a layer of a material selected from the group consisting of hydroxyapatite and a mixture of hydroxyapatite and ceramics and a layer of a bonding agent formed between the metallic base material and the layer of hydroxyapatite or a mixture of hydroxyapatite and ceramics, said bonding agent being selected from the group consisting of molybdenum, tantalum, niobium, nickel-chromium-aluminum powdery mixture and nickel-aluminum powdery mixture.
Claim 3
Dependent Claim
30 words
The implant according to claim 1, wherein the layer of a mixture of hydroxyapatite and ceramics comprises not less than 10% by weight of hydroxyapatite and the remainder of ceramics.
Claim 4
Dependent Claim
29 words
The implant according to claim 2, wherein the layer of a mixture of hydroxyapatite and ceramics comprises 30 to 70% by weight of hydroxyapatite and the remainder of ceramics.
Claim 5
Dependent Claim
23 words
The implant according to claim 1, wherein a layer of ceramics is formed between the metallic base material and the layer of hydroxyapatite.
Claim 6
Dependent Claim
27 words
the implant according to claim 4, wherein the layer of ceramics and the layer of hydroxyapatite are each formed in a thickness of not more than 300μ.
Claim 7
Dependent Claim
25 words
The implant according to claim 5, wherein the thicknesses of the layers of ceramics and hydroxyapatite are each in the range of 100 to 150μ.
Claim 8
Dependent Claim
45 words
The implant according to claim 1, wherein the layer of a bonding agent is formed in a thickness of not more than 200μ, and the layer of hydroxyapatite or a mixture of hydroxyapatite and ceramics is formed in a thickness of not more than 300μ.
Claim 9
Dependent Claim
47 words
The implant according to claim 7, wherein the thickness of the layer of a bonding agent is in the range of 50 to 150μ, and the thickness of the layer of hydroxyapatite or a mixture of hydroxyapatite and ceramics is in the range of 100 to 250μ.
Claim 10
Dependent Claim
26 words
The implant according to claim 4, wherein a layer of a bonding agent is further formed between the metallic base material and the layer of ceramics.
Claim 11
Dependent Claim
41 words
The implant according to claim 9, wherein the layer of a bonding agent is formed in a thickness of not more than 200μ and the layers of ceramics and hydroxyapatite are each formed in a thickness of not more than 300μ.
Claim 12
Dependent Claim
43 words
The implant according to claim 10, wherein the thickness of the layer of a bonding agent is in the range of 50 to 150μ, and the thicknesses of the layers of ceramics and hydroxyapatite are each in the range of 100 to 150μ.
Claim 13
Dependent Claim
36 words
The implant according to claim 1, wherein the metallic base material is made of a member selected from the group consisting of a cobalt-chromium-nickel alloy, a cobalt-chromium-molybdenum alloy, stainless steel 18-8, 316 L, titanium and tantalum.
Claim 14
Dependent Claim
38 words
The implant according to claim 1, wherein the ceramics are a member selected from the group consisting of aluminum oxide, titanium oxide, zirconium oxide, silicon dioxide, stannic oxide, phosphorus pentaoxide, calcium oxide, diboron trioxide, and a mixture thereof.
Claim 15
Dependent Claim
12 words
The implant of claim 1, wherein the implant is for a bone.
Claim 16
Dependent Claim
12 words
The implant of claim 1, wherein the implant is for a joint.
Claim 17
Dependent Claim
13 words
The implant of claim 1, wherein the implant is for a tooth root.
Claim 18
Dependent Claim
16 words
The implant of claim 1, wherein the metal base is in the form of a pin.
Claim 19
Dependent Claim
16 words
The implant of claim 1, wherein the metal base is in the form of a blade.
Claim 20
Dependent Claim
16 words
The implant of claim 1, wherein the metal base is in the form of an anchor.
Claim 21
Dependent Claim
16 words
The implant of claim 1, wherein the metal base is in the form of a plate.
Claim 22
Dependent Claim
16 words
The implant of claim 1, wherein the metal base is in the form of a mesh.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |