EP0049720A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Prosthesis comprising composite material
Assignee: National Research Development Corp UK
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Filing: 1980-10-09
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Granted: —
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Expires: 2000-10-09
Abstract
Abstract A composite of a homo- or co-polyolefin having an average molecular weight greater than 200,000 with up to 80% by volume of a particulate inorganic solid for use in endoprosthesis.
Inventors
- 👤 William Bonfield
- 👤 Jeremy Archibald Bowman
- 👤 Marc Daniel Grynpas
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 15:10
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/40; A61L27/44; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/3094; A61F2/30965; A61L27/46
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
29 words
A composite of a homo- or co-polyolefin having a weight average molecular weight (M ) greater than 20,000 with up to 80% by volume of a particulate inorganic solid.
Claim 2
Dependent Claim
29 words
A composite of a homo- or co-polyolefin having a weight average molecular weight (M ) greater than 20,000 with up to 80% by volume of a particulate inorganic solid.
Claim 3
Dependent Claim
27 words
A composite according to Claim 1 wherein the polyolefin comprises polyethylene, polypropylene, polybutylene, or a copolymer of ethylene and at least out of propylene, butylene and hexene.
Claim 4
Dependent Claim
12 words
A composite according to Claim 2 wherein the polyolefin comprises linear polyethylene.
Claim 5
Dependent Claim
20 words
A composite according to any preceding claim wherein the polyolefin has an M greater than 100,000 but less than 1,000,000.
Claim 6
Dependent Claim
20 words
A composite according to any preceding claim which comprises from 10% to 70% by volume of the particulate inorganic solid.
Claim 7
Dependent Claim
19 words
A composite according to Claim 5 which comprises from 20% to 60% by volume of the particulate inorganic solid.
Claim 8
Dependent Claim
21 words
A composite according to any preceding claim wherein the particulate inorganic solid has a Young's modulus from 50 to 150 GPa.
Claim 9
Dependent Claim
20 words
A composite according to Claim 7 wherein the particulate inorganic solid has a Young's modulus from 60 to 120 GPa.
Claim 10
Dependent Claim
15 words
A composite according to any preceding claim wherein the particulate inorganic solid comprises a ceramic.
Claim 11
Dependent Claim
16 words
A composite according to any preceding claim wherein the particulate inorganic solid comprises a calcium salt.
Claim 12
Dependent Claim
24 words
A composite according to Claim 10 wherein the calcium salt is a calcium prosphate in which the Ca:P ratio is from 1.0 to 1.5.
Claim 13
Dependent Claim
26 words
A composite according to Claim 10 wherein the calcium salt is a natural or synthetic hydroxyapatite or fluorapatite having a Ca:P ratio from 1.51 to 1.7.
Claim 14
Dependent Claim
19 words
A composite according to any preceding claim wherein the inorganic solid is in the form of ground spherical particles.
Claim 15
Dependent Claim
21 words
A composite according to Claim 13 wherein the particle size is from 90% being less than 100 pm to 0.05 µm.
Claim 16
Dependent Claim
23 words
A composite according to any of Claims I to 12 wherein the inorganic solid is in the form of acicular particles or platelets.
Claim 17
Dependent Claim
23 words
A composite according to Claim 15 wherein the platelets have a maximum length of 500 µm and a maximum thickness of 20 µm.
Claim 18
Dependent Claim
18 words
A composite according to any preceding claim which has a Young's modulus from 2 GPa to 40 GPa.
Claim 19
Dependent Claim
17 words
A composite according to Claim 17 which has a Young's modulus from 5 GPa to 30 GPa.
Claim 20
Dependent Claim
15 words
A composite according to any preceding claim which has been oriented in a machine direction.
Claim 21
Dependent Claim
21 words
A composite according to any of Claims 17 to 19 wherein the ratio E ||:E ⊥ is from 1 to 3.
Claim 22
Dependent Claim
19 words
A composite of a homo- or co-polyolefin with a particulate inorganic solid for use in surgery as a prosthesis.
Claim 23
Dependent Claim
19 words
A composite of a homo- or co-polyolefin with a particulate inorganic solid for use in surgery as a prosthesis.
Claim 24
Dependent Claim
16 words
A composite according to Claim 21 which is defined in any of Claims 1 to 20.
Claim 25
Dependent Claim
14 words
A prosthesis which comprises a composite according to any of Claims 1 to 22.
Claim 26
Dependent Claim
11 words
A prosthesis according to Claim 23 which is a femoral prosthesis.
Claim 27
Dependent Claim
8 words
A prosthesis which has been Y-irradiated after fabrication.
Claim 28
Dependent Claim
8 words
A prosthesis which has been Y-irradiated after fabrication.
References Cited (Backward Citations)
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