US4430760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonstress-bearing implantable bone prosthesis
Assignee: Collagen Aesthetics Inc
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Filing: 1981-12-18
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Granted: 1984-02-14
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Expires: 2001-12-18
Abstract
Abstract A flexible, nonstress-bearing bone prosthesis is disclosed that comprises demineralized bone powder contained within a medical grade porous flexible casing made from polymeric fibers or a micro-porous membrane. The pores of the casing are smaller than the particle size of the bone powder but large enough to permit ingress of body cells associated with bone formation.
Inventors
- 👤 Thomas L. Smestad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:20
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/36; A61L27/3641; A61L27/3645; A61L27/365; A61F; A61F2/00; A61F2/02; A61F2/28; A61F2/2846; A61L27/14; A61L27/22; A61L27/24; A61L27/3604; A61L27/3608; A61L27/40; A61L27/44; A61L27/446; A61L27/50; A61L27/56; A61F2/30; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30062; A61F2210/00; A61F2210/0004; A61F2310/00; A61F2310/00005; A61F2310/00359; A61F2310/00365; A61L2430/00; A61L2430/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
An implantable nonstress-bearing bone prosthesis comprising particulate demineralized bone, dentin, or mixtures thereof contained within the interior of a medical grade flexible porous closed container made of bioerodible collagen, the pores of which are smaller than the particle size of the particulate demineralized bone or dentin, but large enough to permit passage of osteogenic and/or mesenchymal cells.
Claim 2
Dependent Claim
57 words
An implantable nonstress-bearing bone prosthesis comprising particulate demineralized bone, dentin, or mixtures thereof contained within the interior of a medical grade flexible porous closed container made of bioerodible collagen, the pores of which are smaller than the particle size of the particulate demineralized bone or dentin, but large enough to permit passage of osteogenic and/or mesenchymal cells.
Claim 3
Dependent Claim
30 words
The implantable nonstress-bearing bone prosthesis of claim 1 wherein the particle size of the particulate demineralized bone or dentin is in the range of about 40 to about 500 microns.
Claim 4
Dependent Claim
29 words
The implantable nonstress-bearing bone prosthesis of claim 1 wherein the particle size of the particulate demineralized bone or dentin is in the range of about 75 to 250 microns.
Claim 5
Dependent Claim
32 words
The implantable nonstress-bearing bone prosthesis of claim 2 or 3 wherein the size of the pores in the container is about 10-15 microns below the minimum particle size of the demineralized bone.
Claim 6
Dependent Claim
20 words
The implantable nonstress-bearing bone prosthesis of claim 1 wherein the container is made from a nonwoven fabric of bioerodible collagen.
Claim 7
Dependent Claim
19 words
The implantable nonstress-bearing bone prosthesis of claim 1, 4 or 5 wherein the container is made from crosslinked collagen.
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) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |