US5314478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial bone connection prosthesis
Assignee: BIOMATERIAL UNIVERSE A CORP OF JAPAN KK
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Filing: 1991-04-26
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Granted: 1994-05-24
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Expires: 2011-04-26
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 12:26
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: 18
Claim 1
Independent Claim
117 words
A prosthesis used for replacing damaged articular bone portions having bone tissue grown thereon and damaged articular cartilage of a living body, the prosthesis comprising: polyvinyl alcohol hydrogel and a porous body, wherein the hydrogel is carried into said porous body via infiltration and fixation thereby forming a resulting porous body such that said porous body is shaped in the form of said bone portions or articular cartilage it replaces, and wherein the resulting porous body is positioned at and brought into contact with the articular bone portions so that the bone tissue is allowed to grow into and ossify within said resulting porous body to connect said hydrogel to the bone portions of the living body.
Claim 2
Dependent Claim
117 words
A prosthesis used for replacing damaged articular bone portions having bone tissue grown thereon and damaged articular cartilage of a living body, the prosthesis comprising: polyvinyl alcohol hydrogel and a porous body, wherein the hydrogel is carried into said porous body via infiltration and fixation thereby forming a resulting porous body such that said porous body is shaped in the form of said bone portions or articular cartilage it replaces, and wherein the resulting porous body is positioned at and brought into contact with the articular bone portions so that the bone tissue is allowed to grow into and ossify within said resulting porous body to connect said hydrogel to the bone portions of the living body.
Claim 3
Dependent Claim
21 words
A prosthesis according to claim 1 wherein said porous body is selected from the group consisting of ceramic and metallic mesh.
Claim 4
Dependent Claim
21 words
A prosthesis according to claim 1, wherein said polyvinyl alcohol hydrogel has a water content of 10 to 60 weight %.
Claim 5
Dependent Claim
117 words
A prosthesis used for replacing damaged articular bone portions having bone tissue grown thereon and damaged articular cartilage of a living body, the prosthesis comprising: polyvinyl alcohol hydrogel and a porous body, wherein said polyvinyl alcohol has a polymerization rate of at least 1700 and a saponification rate of at least 99.5 mol % is carried into said porous body via infiltration and fixation thereby forming a resulting porous body, and wherein the resulting porous body is positioned at and brought into contact with the articular bone portions so that the bone tissue is allowed to grow into and ossify within said resulting porous body to connect said hydrogel to the bone portions of the living body.
Claim 6
Dependent Claim
117 words
A prosthesis used for replacing damaged articular bone portions having bone tissue grown thereon and damaged articular cartilage of a living body, the prosthesis comprising: polyvinyl alcohol hydrogel and a porous body, wherein said polyvinyl alcohol has a polymerization rate of at least 1700 and a saponification rate of at least 99.5 mol % is carried into said porous body via infiltration and fixation thereby forming a resulting porous body, and wherein the resulting porous body is positioned at and brought into contact with the articular bone portions so that the bone tissue is allowed to grow into and ossify within said resulting porous body to connect said hydrogel to the bone portions of the living body.
Claim 7
Dependent Claim
101 words
A prosthesis used for replacing damaged articular bone portions having bone tissue grown thereon and damaged articular cartilage of a living body, the prosthesis comprising: polyvinyl alcohol hydrogel and a porous body of titanium mesh, wherein the hydrogel is carried into said porous body via infiltration and fixation thereby forming a resulting porous body, and wherein the resulting porous body is positioned at and brought into contact with the articular bone portions so that the bone tissue is allowed to grow into and ossify within said resulting porous body to connect said hydrogel to the bone portions of the living body.
Claim 8
Dependent Claim
101 words
A prosthesis used for replacing damaged articular bone portions having bone tissue grown thereon and damaged articular cartilage of a living body, the prosthesis comprising: polyvinyl alcohol hydrogel and a porous body of titanium mesh, wherein the hydrogel is carried into said porous body via infiltration and fixation thereby forming a resulting porous body, and wherein the resulting porous body is positioned at and brought into contact with the articular bone portions so that the bone tissue is allowed to grow into and ossify within said resulting porous body to connect said hydrogel to the bone portions of the living body.
Claim 9
Dependent Claim
12 words
A prosthesis according to claim 5, wherein the porous body is alumina.
Claim 10
Dependent Claim
46 words
A prosthesis device for replacing bone or articular cartilage, the device comprising: a porous body; and polyvinyl alcohol hydrogel, wherein said hydrogel is fixed within the porous body such that said porous body is shaped in the form of said bone or articular cartilage it replaces.
Claim 11
Dependent Claim
46 words
A prosthesis device for replacing bone or articular cartilage, the device comprising: a porous body; and polyvinyl alcohol hydrogel, wherein said hydrogel is fixed within the porous body such that said porous body is shaped in the form of said bone or articular cartilage it replaces.
Claim 12
Dependent Claim
22 words
The prosthetic device according to claim 7, wherein the porous body is selected from the group consisting of ceramic and metallic mesh.
Claim 13
Dependent Claim
21 words
The prosthetic device according to claim 8, wherein the ceramic porous body is alumina having a porosity of 20% to 80%.
Claim 14
Dependent Claim
14 words
The prosthetic device according to claim 7, wherein the porous body is titanium mesh.
Claim 15
Dependent Claim
82 words
A prosthetic device for replacing damaged bone and articular cartilage, the device comprising: a porous body; polyvinyl alcohol hydrogel having a water content of approximately 10 to 60 weight %; said porous body being selected from the group consisting of ceramic and metallic mesh; said hydrogel being fixed within the porous body when the bone and articular cartilage are replaced; and said porous body having the hydrogel fixed therein being shaped in the form of the bone and the articular cartilage replaced.
Claim 16
Dependent Claim
82 words
A prosthetic device for replacing damaged bone and articular cartilage, the device comprising: a porous body; polyvinyl alcohol hydrogel having a water content of approximately 10 to 60 weight %; said porous body being selected from the group consisting of ceramic and metallic mesh; said hydrogel being fixed within the porous body when the bone and articular cartilage are replaced; and said porous body having the hydrogel fixed therein being shaped in the form of the bone and the articular cartilage replaced.
Claim 17
Dependent Claim
14 words
A prosthetic device according to claim 11, wherein the ceramic porous body is alumina.
Claim 18
Dependent Claim
15 words
A prosthetic device according to claim 11, wherein the metallic mesh porous body is titanium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-05-23 | 1997-11-22 | 1998-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-23 | 2001-11-22 | 2002-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-23 | 2005-11-22 | 2006-05-24 | $7700.00 | Window Closed / Lapsed |