US4619655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plaster of Paris as a bioresorbable scaffold in implants for bone repair
Assignee: University of North Carolina at Chapel Hill
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Filing: 1984-01-26
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Granted: 1986-10-28
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Expires: 2004-01-26
Abstract
Abstract Plaster of Paris is employed to form implants as well as a bioresorbable scaffold for implants and bone repair in animals. In bone repair, the plaster is mixed with a non-bioresorbable calcium source, such as calcium phosphate ceramic, to stimulate bone formation. Plaster may also be used as a medicament implant, encasing the active material for subsequent release to the body.
Inventors
- 👤 Jacob S. Hanker
- 👤 Bill C. Terry
- 👤 Wallace W. Ambrose
- 👤 Cecel R. Lupton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:43
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/02; A61L27/12; A61L15/00; A61L15/07; A61L15/08; A61L24/00; A61L24/02; A61L2430/00; A61L2430/02
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
23 words
An animal implant comprising a scaffold material composed of Plaster of Paris and a non-bioresorbable calcium material bound within said Plaster of Paris.
Claim 2
Dependent Claim
23 words
An animal implant comprising a scaffold material composed of Plaster of Paris and a non-bioresorbable calcium material bound within said Plaster of Paris.
Claim 3
Dependent Claim
22 words
The implant of claim 1 wherein said non-bioresorbable material is calcium ceramic particles selected from calcium phosphate, calcium triphosphate or mixtures thereof.
Claim 4
Dependent Claim
16 words
The implant of claim 1 containing an effective amount of a medicament bound within said plaster.
Claim 5
Dependent Claim
9 words
The implant of claim 1 containing a support material.
Claim 6
Dependent Claim
12 words
The implant of claim 4 wherein said support material is stainless steel.
Claim 7
Dependent Claim
14 words
The implant of claim 4 wherein said support material is metallic or plastic mesh.
Claim 8
Dependent Claim
29 words
The implant of claim 1 consisting essentially of Plaster of Paris and from about 0.5 to 6 parts by weight of calcium phosphate ceramic particles per part of plaster.
Claim 9
Dependent Claim
24 words
A composition suitable for use as a bone implant comprising calcium phosphate ceramic particles and Plaster of Paris as a binder for said particles.
Claim 10
Dependent Claim
24 words
A composition suitable for use as a bone implant comprising calcium phosphate ceramic particles and Plaster of Paris as a binder for said particles.
Claim 11
Dependent Claim
10 words
The composition of claim 8 in an injectable, fluid form.
Claim 12
Dependent Claim
9 words
The composition of claim 8 in a preformed shape.
Claim 13
Dependent Claim
28 words
The composition of claim 8 wherein the ratio of calcium phosphate to plaster, on a weight basis, is approximately 0.5-6 parts of calcium phosphate per part of plaster.
Claim 14
Dependent Claim
31 words
A method of providing a bone implant in an animal which comprises injecting the composition of claim 8 in fluid or semisolid form into the appropriate body location of an animal.
Claim 15
Dependent Claim
28 words
A method of providing a bone implant in an animal which comprises inserting a preform of the composition of claim 8 into the appropriate location of an animal.
Claim 16
Dependent Claim
28 words
A method for replacing fibrous connective tissue in an animal which comprises implanting the implant of claim 1 in an animal about a fracture locus within said animal.
Claim 17
Dependent Claim
26 words
A method of treating an animal in need of a medicament which comprises implanting within said animal at an effective locus, the implant of claim 3.
Claim 18
Dependent Claim
27 words
A method of healing a fracture area within the body of an animal which comprises implanting at the locus of said fracture the implant of claim 1.
Claim 19
Dependent Claim
20 words
The implant of claim 7 consisting essentially of about 1 part by weight of ceramic particles per part of plaster.
Claim 20
Dependent Claim
22 words
The composition of claim 11 wherein the ratio of calcium phosphate to plaster, on a weight basis, is approximately 1 to 1.
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) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |