Patent EP0505634B1 successfully refreshed from Google Patents.
EP0505634B1
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EP
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A prosthesis
Assignee: BIOMATERIAL UNIVERSE KK
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Filing: 1991-04-26
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Granted: 1997-08-20
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Expires: 2011-04-26
Abstract
No abstract record available.
Inventors
- 👤 Masanori Oka
- 👤 Shokyu Gen
- 👤 Yoshito Ikada
- 👤 Hideaki c/o Kyocera Corp. Okimatsu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 17:49
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/28; A61F2/30; A61F2/30756; A61F2/32; A61F2/36; A61F2/3601; A61F2/3603; A61F2/44; A61F2/442; A61L; A61L27/00; A61L27/14; A61L27/16; A61L27/50; A61L27/52; A61F2/3094; A61F2/30965; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30113; A61F2002/30125; A61F2002/30133; A61F2002/30138; A61F2002/30153; A61F2002/30154; A61F2002/30156; A61F2002/30199; A61F2002/30224; A61F2002/30261; A61F2002/30263; A61F2002/3028; A61F2002/30316; A61F2002/30535; A61F2002/30563; A61F2002/30667; A61F2002/30673; A61F2/30767; A61F2/30907; A61F2002/30909; A61F2002/30915; A61F2002/30971; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0006; A61F2230/0008; A61F2230/0015; A61F2230/0017; A61F2230/0019; A61F2230/0021; A61F2230/0023; A61F2230/0063; A61F2230/0069; A61F2230/0082; A61F2230/0084; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00179; A61F2310/00185; A61F2310/00203
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A prosthesis for use in replacing at least one of a damaged bone, an articular cartilage and an intervertebral disc, characterised in that the prosthesis comprises: polyvinyl alcohol hydrogel and a porous body, the porous body comprising at least one of a ceramic material and a metallic material, wherein the hydrogel is carried selectively into the porous body by infiltration and fixation such that porous parts remain in desired regions of the body, and also the hydrogel is available for surface contact in use at the interface between the resulting at least partially infiltrated porous body and articular bone portions to function as the articular cartilage, and in use the porous parts permit bone tissue to grow into and ossify within the said porous parts of the body to connect the hydrogel to natural bone portions of a living body.
Claim 2
Dependent Claim
37 words
A prosthesis according to claim 1 wherein the prosthesis provides artificial articular cartilage comprising a polyvinyl alcohol hydrogel having a degree of polymerisation of 1700 or more and a saponification degree of 99.5 mol % or more.
Claim 3
Dependent Claim
24 words
A prosthesis according to claim 2 wherein the water content of the polyvinyl alcohol hydrogel is in the range of from 10 to 60%.
Claim 4
Dependent Claim
19 words
A prosthesis according to any one of claims 1 to 3 wherein the porous body comprises a titanium mesh.
Claim 5
Dependent Claim
26 words
A prosthesis according to any one of claims 1 to 3 wherein the porous body comprises alumina ceramic having a porosity of from 20 to 80%.
Claim 6
Dependent Claim
71 words
A method of producing a prosthesis of the type claimed in claim 1, particularly an artificial articular cartilage, wherein the method is characterised by the step of contacting an alumina ceramic porous body or a metallic mesh with a polyvinyl alcohol solution to cause at least a part of said body or mesh to become infiltrated by said solution, and setting that solution at a low temperature to form a hydrogel.
Claim 7
Dependent Claim
71 words
A method according to claim 6 further characterised by firstly treating the porous body or metallic mesh, at least in part at selected regions where ossification by natural tissue ingrowth is desired in use, with a fixative to control the infiltration of polyvinyl alcohol solution, and subsequently drying the hydrogel formed from the set polyvinyl alcohol solution and heat-treating it at a temperature in the range of from 120 to 180°C.
Claim 8
Dependent Claim
42 words
A prosthesis according to claim 1 wherein the prosthesis provides an artificial intervertebral disc and is characterised in that it comprises a pair of porous bodies (1, 11), of metal or ceramic, and a polyvinyl alcohol hydrogel block (22) integrally incorporated therebetween.
Claim 9
Dependent Claim
33 words
A prosthesis according to claim 8, wherein the polyvinyl alcohol hydrogel block is attached to the respective porous bodies by infiltration and fixation thereof within regions (3, 33; 4, 44) of said bodies.
References Cited (Backward Citations)
No citation records indexed.
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