Patent US4863475A successfully refreshed from Google Patents.
US4863475A
Expired / Lapsed
US
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Implant and method for production thereof
Assignee: Zimmer Technology Inc
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Filing: 1984-08-31
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Granted: 1989-09-05
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Expires: 2004-08-31
Abstract
Abstract An implantable prosthesis including a base member, such as the stem of a hip joint prosthesis, having a porous region on its surface, and the region of porosity being coated with a bioabsorbable material, such as α-tricalcium phosphate, which enhances permanent bone ingrowth into the region. A method of manufacture of the prosthesis includes the steps of providing a coating material and applying the material to at least a portion of the porous surface of the base member, while providing energy sufficient to transform the material to a state in which it is bioabsorbable. In the preferred embodiment the material is plasma sprayed onto the porous surface of the base member.
Inventors
- 👤 Phillip J. Andersen
- 👤 Jack E. Parr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:09
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/28; A61L27/30; A61L27/32; A61F; A61F2/00; A61F2/02; A61F2/28; A61F2/30; A61F2/30767; A61F2/30907; A61L27/50; A61L27/56; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/72; A61B17/80; A61F2/3094; A61F2/32; A61F2/34; A61F2/36; A61F2/3662; A61F2/367; A61F2/38; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30062; A61F2002/30064; A61F2/30771; A61F2002/3082; A61F2002/30822; A61F2002/30968; A61F2/3609; A61F2002/3611; A61F2002/3625; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017; A61F2310/00029; A61F2310/00389; A61F2310/00395; A61F2310/00407; A61F2310/00592; A61F2310/00796; Y; Y10; Y10S; Y10S623/00; Y10S623/901
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
142 words
A method of manufacturing a prosthetic part for use as a body implant comprising the steps of: providing a base member having a porous surface region on which bone attachment is desired; providing a coating material of hydroxyapatite and β-tricalcium phosphate; and applying said coating material directly to said porous surface region for adherence to said porous surface region, while providing energy sufficient to transform said coating material to a state in which it is bioabsorbable, said step of applying comprising heating said coating material to a temperature greater than 1350° and applying it to said porous surface region, said coating material upon receiving said provided energy during the application thereof transforms to primarily α-tricalcium phosphate on said porous surface region, and said coating material includes the α-tricalcium phosphate only after the application of the coating material to said porous surface region.
Claim 2
Independent Claim
142 words
A method of manufacturing a prosthetic part for use as a body implant comprising the steps of: providing a base member having a porous surface region on which bone attachment is desired; providing a coating material of hydroxyapatite and β-tricalcium phosphate; and applying said coating material directly to said porous surface region for adherence to said porous surface region, while providing energy sufficient to transform said coating material to a state in which it is bioabsorbable, said step of applying comprising heating said coating material to a temperature greater than 1350° and applying it to said porous surface region, said coating material upon receiving said provided energy during the application thereof transforms to primarily α-tricalcium phosphate on said porous surface region, and said coating material includes the α-tricalcium phosphate only after the application of the coating material to said porous surface region.
Claim 3
Dependent Claim
34 words
The method as described in claim 1 wherein said coating material intrudes into said porous surface region in decreasing continuity from the outside of said porous surface toward the inside of said porous surface.
References Cited (Backward Citations)
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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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |