US4863974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bone growth matrix and process for making it
Assignee: W.L. Gore and Associates Inc
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Filing: 1988-08-03
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Granted: 1989-09-05
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Expires: 2008-08-03
Abstract
Abstract The present invention provides for a bone growth material for filling in defects or hollow portions of bones to be ingrown by and coalesce with bone tissues wherein the bone growth material is comprised of expanded PTFE and calcium phosphate.
Inventors
- 👤 Robert S. Mallouk
- 👤 William P. Mortimer, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:51
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/50; A61L27/56; A61L27/40; A61L27/44; A61L27/46; Y; Y10; Y10S; Y10S521/00; Y10S521/919; Y10S623/00; Y10S623/924; Y10S623/925
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
94 words
A bone growth material for filling in defects or hollow portions of bones to coalesce with bone tissue wherein said bone growth matrix consists essentially of between 1.5 to 12% by volume expanded polytetrafluoroethylene having a void content of greater than 70% and comprising a matrix of interconnected channels defined by nodes and fibrils and between 2.5 to 18% by volume calcium phosphate particles interspersed throughout the expanded polytetrafluoroethylene, in which the matrix is coherent and resilient and in which the interconnected channels are of a size capable of allowing for vascularized tissue ingrowth.
Claim 2
Dependent Claim
94 words
A bone growth material for filling in defects or hollow portions of bones to coalesce with bone tissue wherein said bone growth matrix consists essentially of between 1.5 to 12% by volume expanded polytetrafluoroethylene having a void content of greater than 70% and comprising a matrix of interconnected channels defined by nodes and fibrils and between 2.5 to 18% by volume calcium phosphate particles interspersed throughout the expanded polytetrafluoroethylene, in which the matrix is coherent and resilient and in which the interconnected channels are of a size capable of allowing for vascularized tissue ingrowth.
Claim 3
Dependent Claim
26 words
A bone growth material as described in claim 1 wherein said calcium phosphate is calcium triphosphate of the formula CA 5 (PO 4 ) 3 OH.
Claim 4
Dependent Claim
17 words
A bone growth material as described in claim 1 wherein said calcium phosphate is resorbable calcium phosphate.
Claim 5
Dependent Claim
35 words
A bone growth material as described in claim 1 wherein said expanded PTFE comprises between 3 and 6 by volume percent of the matrix and said calcium phosphate comprises between 4 and 8 volume percent.
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 |