US5458643A
Expired / Lapsed
US
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Artificial intervertebral disc
Assignee: Biomaterials Universe Inc
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Filing: 1994-02-01
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Granted: 1995-10-17
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Expires: 2014-02-01
Abstract
Abstract A prosthesis used for a damaged bone, an artificial articular cartilage or an artificial intervertebral disc being characterized in that the prosthesis is a composite body comprising polyvinyl alcohol hydrogel and ceramic or metallic porous body. With this prosthesis, PVA hydrogel enhances lubrication and shock absorbing functions, and the porous body allows the ingrowth and ossification of the bone tissue of a living body therein to affinitively connect said hydrogel to the bones of the living body.
Inventors
- 👤 Masanori Oka
- 👤 Shokyu Gen
- 👤 Yoshito Ikada
- 👤 Hideaki Okimatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:48
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: 4
Claim 1
Independent Claim
129 words
A prosthesis used for replacing at least one of a damaged bone, an articular cartilage and an intervertebral disc, the prosthesis comprising: 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 into the porous body via infiltration and fixation, thereby forming a resulting porous body having a shape corresponding to the at least one of a damaged bone, an articular cartilage and an intervertebral disc it replaces, and wherein the resulting porous body is positioned at and brought into contact with articular bone portions so that bone tissue is allowed to grow into and ossify within the resulting porous body to connect the hydrogel to bone portions of a living body.
Claim 2
Dependent Claim
129 words
A prosthesis used for replacing at least one of a damaged bone, an articular cartilage and an intervertebral disc, the prosthesis comprising: 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 into the porous body via infiltration and fixation, thereby forming a resulting porous body having a shape corresponding to the at least one of a damaged bone, an articular cartilage and an intervertebral disc it replaces, and wherein the resulting porous body is positioned at and brought into contact with articular bone portions so that bone tissue is allowed to grow into and ossify within the resulting porous body to connect the hydrogel to bone portions of a living body.
Claim 3
Dependent Claim
46 words
The prosthesis of claim 1, comprising: a pair of porous bodies, the pair of porous bodies comprising at least one of a pair of metallic bodies and a pair of ceramic bodies, and a polyvinyl alcohol hydrogel block integrally incorporated between the pair of porous bodies.
Claim 4
Dependent Claim
24 words
The prosthesis of claim 2, wherein the polyvinyl alcohol hydrogel is carried by the porous body contacting the hydrogel block via infiltration and fixation.
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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) | 1998-10-16 | 1999-04-17 | 1999-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-16 | 2003-04-17 | 2003-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-16 | 2007-04-17 | 2007-10-17 | $7700.00 | Window Closed / Lapsed |