US4257405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bone graft materials
Assignee: Individual
•
Filing: 1979-02-06
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Granted: 1981-03-24
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Expires: 1999-02-06
Abstract
Abstract A bone graft material, especially for repairing skeletal defects, formed of carbonized wood; best results have been achieved with carbonized stemwoods of climbing plants, e.g. Clematis, which have the most advantageous pore size and porosity to accept bone ingrowth upon implantation.
Inventors
- 👤 James Colville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:03
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/02; A61L27/08; A61F; A61F2/00; A61F2/02; A61F2/28; A61F2002/2835; A61F2310/00; A61F2310/00005; A61F2310/00161; A61L2430/00; A61L2430/02; Y; Y10; Y10S; Y10S623/00; Y10S623/915; Y10S623/919; Y10S623/92; Y10S623/923
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
60 words
A method of repairing a skeletal defect in the body, which comprises grafting a bone graft material into the defect, said material being carbonised wood, having a porosity of at least 30% total volume and an average pore diameter of at least 30 microns, whereby said material is absorbed by the body after grafting, being replaced by fresh bone growth.
Claim 2
Independent Claim
60 words
A method of repairing a skeletal defect in the body, which comprises grafting a bone graft material into the defect, said material being carbonised wood, having a porosity of at least 30% total volume and an average pore diameter of at least 30 microns, whereby said material is absorbed by the body after grafting, being replaced by fresh bone growth.
Claim 3
Independent Claim
71 words
A method for repairing a sketetal defect in the body, which comprises grafting bone graft material into the defect, said material consisting essentially of pure carbon formed by carbonizing wood in an inert atmosphere, said carbon having a porosity of at least 30% total volume and an average pore diameter of at least 30 microns, whereby said material is absorbed by the body after grafting, being replaced by fresh bone growth.
Claim 4
Independent Claim
71 words
A method for repairing a sketetal defect in the body, which comprises grafting bone graft material into the defect, said material consisting essentially of pure carbon formed by carbonizing wood in an inert atmosphere, said carbon having a porosity of at least 30% total volume and an average pore diameter of at least 30 microns, whereby said material is absorbed by the body after grafting, being replaced by fresh bone growth.
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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |