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US5723038A
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Process for producing a gradient coating made of calcium phosphate phases and metal oxide phase on metallic implants
Assignee: Biomet Merck GmbH
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Filing: 1996-02-06
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Granted: 1998-03-03
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Expires: 2016-02-06
Abstract
Abstract The invention concerns a process for producing a gradient coating of calcium phosphat phases and metal oxide phases on metallic implants, in particular made of titanium or titanium alloys, for use as dental, jaw or joint implants. A solution containing calcium ions and phosphate ions is used as electrolyte of which the pH is slightly acidic to approximately neutral. The substrate electrodes are alternately polarized cathodically and anodically. The layer deposited in a gratuated manner is adherent, has a fine structure and is distinguished by a high degree of biocompatibility.
Inventors
- 👤 Dieter Scharnweber
- 👤 Henrike Bersch
- 👤 Hartmut Worch
- 👤 Jurgen Hofinger
- 👤 Curt Kranz
- 👤 Wolfgang Pompe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:49
CPC Classifications
C; C25; C25D; C25D9/00; C25D9/04; A; A61; A61L; A61L27/00; A61L27/28; A61L27/30; A61L27/32; A61F; A61F2310/00; A61F2310/00389; A61F2310/00592; A61F2310/00796; Y; Y10; Y10S; Y10S623/00; Y10S623/901
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
A process for producing a gradient coating of calcium phosphate phases and metal oxide phases on a metal implant, comprising: providing a metal implant; providing an electrolyte solution containing calcium phosphate ions, and having a pH of between 4.0 and 7.5; providing a counter electrode in the electrolyte solution; placing the implant in the electrolyte solution; applying an electrical potential between the counter electrode and the implant, so that the implant initially acts as a substrate cathode; periodically reversing the polarity of the electrical potential a plurality of times, so that the implant alternates between cathodic polarization and anodic polarization, to deposit a gradient coating of calcium phosphate phases and metal oxide phases on the implant.
Claim 2
Dependent Claim
116 words
A process for producing a gradient coating of calcium phosphate phases and metal oxide phases on a metal implant, comprising: providing a metal implant; providing an electrolyte solution containing calcium phosphate ions, and having a pH of between 4.0 and 7.5; providing a counter electrode in the electrolyte solution; placing the implant in the electrolyte solution; applying an electrical potential between the counter electrode and the implant, so that the implant initially acts as a substrate cathode; periodically reversing the polarity of the electrical potential a plurality of times, so that the implant alternates between cathodic polarization and anodic polarization, to deposit a gradient coating of calcium phosphate phases and metal oxide phases on the implant.
Claim 3
Dependent Claim
23 words
A process according to claim 1, wherein the ratio of calcium to phosphate ions in the electrolyte is equal to that of hydroxyapatite.
Claim 4
Dependent Claim
16 words
A process according to claim 1, wherein the deposition is halted after a cathodic polarization step.
Claim 5
Dependent Claim
23 words
A process according to claim 1, wherein the time period of polarization is raised for at least one step after the initial polarization.
Claim 6
Dependent Claim
17 words
A process according to claim 1, wherein the anodic polarization is carried out with increasingly positive potential.
Claim 7
Dependent Claim
39 words
A process according to claim 1, wherein the cathodic polarization is carried out potentiostatically or galvanostatically and the anodic polarization is carried out potentiodynamically or galvanostatically until a target potential of between 2 and 150 V SCE is reached.
Claim 8
Dependent Claim
32 words
A process according to claim 1, wherein the total time of anodic polarization is between 1 and 60 minutes, and the total time of cathodic polarization is between 1 and 60 minutes.
Claim 9
Dependent Claim
28 words
A process according to claim 1, wherein the cathodic polarization is galvanostatic, and is carried out at a current density of between 0.1 and 5 mA/cm 2 .
Claim 10
Dependent Claim
16 words
A process according to claim 1, wherein each period of polarization lasts at least 10 minutes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-03-02 | 2001-09-01 | 2002-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-02 | 2005-09-01 | 2006-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-02 | 2009-09-01 | 2010-03-03 | $7700.00 | Window Closed / Lapsed |