US4849285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite macrostructure of ceramic and organic biomaterials
Assignee: Bio Medical Sciences Inc
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Filing: 1987-06-01
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Granted: 1989-07-18
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Expires: 2007-06-01
Abstract
Abstract A composite self-supporting flexible agglomerated macrostructure is described which comprises (1) a matrix of unfibrillated polytetrafluoroethylene resin and addition curable silicone and (2) particulate material including hydroxyapatite and/or tricalcium phosphate uniformly distributed throughout said matrix, the macrostructure being uniformly permeated by a network of open pores formed in the process of manufacture by intimately blending particulate sodium chloride and subsequently leaching the sodium chloride particles.
Inventors
- 👤 Mark E. Dillon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:20
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/26; A; A61; A61L; A61L27/00; A61L27/40; A61L27/44; A61L27/46; C04; C04B; C04B26/00; C04B26/30; C04B26/32; C08K; C08K3/00; C08K3/32; C04B2111/00; C04B2111/00474; C04B2111/00836; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/258; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A acomposite self-supporting flexible agglomerated macrostructure comprising (1) a matric consisting essentially of a blend of a major portion of unfibrillated polytetrafluoroethylene resin and a minor portion of an addition curable silicone composition, said blend having been heated sufficiently to sinter the polytetrafluoroethylene and to cure said silicone composition, and (2) a particulate material selected from the class consisting of hydroxyapatite and tricalcium phosphate, said particulate material having a maximum particle size of about 2,000 microns and being uniformly distributed throughout said matrix; said macrostructure being uniformly permeated by a network of open pores having a maximum pore size of about 2,000 microns and an overall porosity of up to about 50 percent by volume; and wherein said matrix comprises a major portion of said macrostructure and said particulate material comprises a minor portion of said macrostructure.
Claim 2
Dependent Claim
137 words
A acomposite self-supporting flexible agglomerated macrostructure comprising (1) a matric consisting essentially of a blend of a major portion of unfibrillated polytetrafluoroethylene resin and a minor portion of an addition curable silicone composition, said blend having been heated sufficiently to sinter the polytetrafluoroethylene and to cure said silicone composition, and (2) a particulate material selected from the class consisting of hydroxyapatite and tricalcium phosphate, said particulate material having a maximum particle size of about 2,000 microns and being uniformly distributed throughout said matrix; said macrostructure being uniformly permeated by a network of open pores having a maximum pore size of about 2,000 microns and an overall porosity of up to about 50 percent by volume; and wherein said matrix comprises a major portion of said macrostructure and said particulate material comprises a minor portion of said macrostructure.
Claim 3
Dependent Claim
12 words
The composite macrostructure of claim 1, wherein the particulate material is hydroxyapatite.
Claim 4
Dependent Claim
13 words
The composite macrostructure of claim 1, wherein the particulate material is tricalcium phosphate.
Claim 5
Dependent Claim
18 words
The composite macrostructure of claim 1, wherein the particulate material is a mixture of hydroxyapatite and tricalcium phosphate.
Claim 6
Dependent Claim
22 words
The composite macrostructure of claim 1, wherein the particulate material has a particle size distribution between about 53 microns and 250 microns.
Claim 7
Dependent Claim
21 words
The composite macrostructure of claim 1, wherein the open pores range in size from about 53 microns to about 250 microns.
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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) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |