US5017627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite material for use in orthopaedics
Assignee: BTG International Ltd
•
Filing: 1988-05-02
•
Granted: 1991-05-21
•
Expires: 2008-05-02
Abstract
Abstract A composite of a homo- or co-polyolefin having an average molecular weight greater than 100,000 with from 30 to 50% by volume of a particulate inorganic solid for use in endoprosthesis.
Inventors
- 👤 William Bonfield
- 👤 Jeremy A. Bowman
- 👤 Marc D. Grynpas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:56
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/40; A61L27/44; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/3094; A61F2/30965; A61L27/46; A61F2/28; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
61 words
A prosthesis for replacement of bone comprising a composite formed by compounding, in the solid phase, a homo- or copolyolefin having a weight average molecular weight (M w ) greater than 100,000 with from 30 to 50 percent by volume of a particulate calcium phosphate filler, said composite having a Young's modulus in the range of values recorded for compact bone.
Claim 2
Dependent Claim
61 words
A prosthesis for replacement of bone comprising a composite formed by compounding, in the solid phase, a homo- or copolyolefin having a weight average molecular weight (M w ) greater than 100,000 with from 30 to 50 percent by volume of a particulate calcium phosphate filler, said composite having a Young's modulus in the range of values recorded for compact bone.
Claim 3
Dependent Claim
27 words
A prosthesis according to claim 1 wherein the polyolefin comprises polyethylene, polypropylene, polybutylene, or a copolymer of ethylene and at least one of propylene, butylene and hexane.
Claim 4
Dependent Claim
12 words
A prosthesis according to claim 2 wherein the polyolefin comprises linear polyethylene.
Claim 5
Dependent Claim
20 words
A prosthesis according to claim 2 wherein the polyolefin has an M w greater than 100,000 but less than 1,000,000.
Claim 6
Dependent Claim
20 words
A prosthesis according to claim 2 wherein the particulate calcium phosphate has a Young's modulus from 50 to 150 GPa.
Claim 7
Dependent Claim
20 words
A prosthesis according to claim 5 wherein the particulate calcium phosphate has a Young's modulus from 60 to 120 GPa.
Claim 8
Dependent Claim
18 words
A prosthesis according to claim 1 wherein the calcium phosphate has a Ca:P ratio from 1.0 to 1.5.
Claim 9
Dependent Claim
18 words
A prosthesis according to claim 2 wherein the inorganic solid is in the form of ground spherical particles.
Claim 10
Dependent Claim
21 words
A prosthesis according to claim 8 wherein the particles size is from 90% being less than 100 μm to 0.05 μm.
Claim 11
Dependent Claim
19 words
A prosthesis according to claim 2 wherein the inorganic solid is in the form of acicular particles or platelets.
Claim 12
Dependent Claim
23 words
A prosthesis according to claim 10 wherein the platelets have a maximum length of 500 μm and a maximum thickness of 20 μm.
Claim 13
Dependent Claim
20 words
A prosthesis according to claim 2 in which said composite has a Young's modulus from 2 GPa to 40 GPa.
Claim 14
Dependent Claim
20 words
A prosthesis according to claim 12 in which said composite has a Young's modulus from 5 GPa to 30 GPa.
Claim 15
Dependent Claim
17 words
A prosthesis according to claim 2 in which said composite has been oriented in a machine direction.
Claim 16
Dependent Claim
19 words
A prosthesis according to claim 14 wherein the ratio E.sub.∥ :E.sub.⊥ of said composite is from 1 to 3.
Claim 17
Dependent Claim
11 words
A prosthesis according to claim 12 which is a femoral prosthesis.
Claim 18
Dependent Claim
23 words
A prosthesis for replacement of bone according to claim 16 with 35 to 45 percent by volume of a particulate calcium phosphate filler.
Claim 19
Dependent Claim
80 words
A prosthesis for replacement of bone comprising a composite formed by compounding, in the solid phase, a homo- or copolyolefin having a weight average molecular weight (M w ) greater than 100,000 with from 30 to 50 percent by volume of a particulate calcium salt wherein the calcium salt is a natural or synthetic hydroxyapatite or fluorapatite having a Ca:P ratio from 1.51 to 1.7, said composite having a Young's modulus in the range of values recorded for compact bone.
Claim 20
Dependent Claim
80 words
A prosthesis for replacement of bone comprising a composite formed by compounding, in the solid phase, a homo- or copolyolefin having a weight average molecular weight (M w ) greater than 100,000 with from 30 to 50 percent by volume of a particulate calcium salt wherein the calcium salt is a natural or synthetic hydroxyapatite or fluorapatite having a Ca:P ratio from 1.51 to 1.7, said composite having a Young's modulus in the range of values recorded for compact bone.
Claim 21
Dependent Claim
57 words
An artificial hip comprising a composite formed by compounding, in the solid phase, a homo- or copolyolefin having a weight average molecular weight (M w ) greater than 100,000 with from 30 to 50 percent by volume of a particulate calcium phosphate, said composite having a Young's modulus in the range of values recorded for compact bone.
Claim 22
Dependent Claim
57 words
An artificial hip comprising a composite formed by compounding, in the solid phase, a homo- or copolyolefin having a weight average molecular weight (M w ) greater than 100,000 with from 30 to 50 percent by volume of a particulate calcium phosphate, said composite having a Young's modulus in the range of values recorded for compact bone.
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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) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |