US4687675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of endosseous implants
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1986-05-20
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Granted: 1987-08-18
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Expires: 2006-05-20
Abstract
Abstract An improved method for the production of endosseous implants is disclosed. The method includes thermally spraying a hydroxyapatite-containing powder onto the surface of a metallic core material, and treating the resultant product with an aqueous solution which does not substantially dissolve the hydroxyapatite but can dissolve calcium oxide, to thereby dissolve out alkaline components. The endosseous implants of this invention have excellent mechanical properties and excellent affinity to the living body without hematolysis, and hence, are useful for the treatment or recovery of defective or lost bones, joints and tooth roots.
Inventors
- 👤 Kazuhiko Nakano
- 👤 Keiichirou Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:53
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61C; A61C8/00; A61C8/0012; A61F2/28; A61K; A61K6/00; A61K6/50; A61K6/58; A61K6/80; A61K6/831; A61K6/838; A61K6/84; A61K6/844; A61K6/849; A61K6/878; A61L; A61L27/00; A61L27/28; A61L27/30; A61L27/32; C; C23; C23C; C23C4/00; C23C4/04; C23C4/10; C23C4/11; C23C4/18; A61C8/0013; A61F2310/00; A61F2310/00389; A61F2310/00592; A61F2310/00796; A61L2430/00; A61L2430/02; Y; Y10; Y10S; Y10S623/00; Y10S623/92
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
54 words
A method for the production of endosseous implants comprising thermally spraying a hydroxyapatite-containing powder to the surface of a metallic core material, and treating the thermally sprayed product with an aqueous solution which does not substantially dissolve the hydroxyapatite but can dissolve calcium oxide to thereby dissolve out the alkaline components from the product.
Claim 2
Independent Claim
54 words
A method for the production of endosseous implants comprising thermally spraying a hydroxyapatite-containing powder to the surface of a metallic core material, and treating the thermally sprayed product with an aqueous solution which does not substantially dissolve the hydroxyapatite but can dissolve calcium oxide to thereby dissolve out the alkaline components from the product.
Claim 3
Dependent Claim
33 words
The method according to claim 1, wherein the aqueous solution is an aqueous solution of an inorganic salt selected from the group consisting of ammonium chloride, magnesium chloride, ammonium nitrate and magnesium nitrate.
Claim 4
Dependent Claim
28 words
The method according to claim 1, wherein the aqueous solution is an aqueous solution of a succharide selected from the group consisting of sucrose, glucose, fructose and arabinose.
Claim 5
Dependent Claim
19 words
The method according to claim 1, wherein the aqueous solution is an aqueous solution of ethylene glycol and/or glycerol.
Claim 6
Dependent Claim
13 words
The method according to claim 2, wherein the inorganic salt is ammonium chloride.
Claim 7
Dependent Claim
11 words
The method according to claim 3, wherein the succharide is sucrose.
Claim 8
Dependent Claim
19 words
The method according to claim 1, wherein the aqueous solution is an aqueous solution of ammonium chloride and sucrose.
Claim 9
Dependent Claim
13 words
The method according to claim 1, wherein the thermal spraying is plasma spraying.
References Cited (Backward Citations)
US4146936A
Cited
US4223412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |