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US20030191534A1
Expired / Lapsed
US
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Intervertebral disc prosthesis
Assignee: Choice Spine LLC
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Filing: 2001-03-02
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Granted: —
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Expires: 2021-03-02
Abstract
Abstract The invention concerns an intervertebral disc prosthesis comprising an upper plate ( 2 ) and a lower plate ( 3 ) anchored respectively on the upper end-plate and the lower end-plate of the vertebral bodies of the vertebrae lying above and below a spine, a central core ( 4 ) placed between the two plates ( 2, 3 ) which have an upper spherical cap ( 13 ) and a lower spherical cap ( 14 ) co-operating respectively with the spherical impressions ( 9 ) arranged in said upper and lower plates, and an annular element ( 5 ) made of viscoelastic material which is centred about the core ( 4 ) and is urged into contact with protuberances ( 12 ) provided on each internal surface ( 8 ) of the upper plate ( 2 ) and of the lower plate ( 3 ) so as to limit and control the bending, inclining and rotating movements of the upper plate ( 2 ) and of the lower plate ( 3 ) relative to each other and about the core ( 4 ), and ensure the positioning stability of the core ( 4 ) between the two plates ( 2, 3 ) and prevent fibrous deposits from penetrating inside the prosthesis ( 1 ).
Inventors
- 👤 Guy Viart
- 👤 Frederic Marin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:19
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/44; A61F2/442; A61F2/4425; A61F2/30721; A61F2/30742; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30069; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30125; A61F2002/30138; A61F2002/30156; A61F2002/30199; A61F2002/302; A61F2002/30316; A61F2002/30329; A61F2002/30518; A61F2002/30528; A61F2002/30535; A61F2002/30563; A61F2002/30589; A61F2002/30604; A61F2002/30616; A61F2002/30621; A61F2002/30649; A61F2002/30662; A61F2/30767; A61F2/30771; A61F2002/30841; A61F2002/30878; A61F2002/30879; A61F2002/30884; A61F2002/30891; A61F2002/30892; A61F2002/443; A61F2220/00; A61F2220/0025; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0008; A61F2230/0017; A61F2230/0023; A61F2230/0063; A61F2230/0065; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00029
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
230 words
1 . An intervertebral disk prosthesis comprising an upper plate ( 2 ) and a lower plate ( 3 ) which are anchored respectively to the upper end plate and the lower end plate of the vertebral bodies of the overlying and underlying vertebrae of a spinal column and a central core ( 4 ) placed between the two plates ( 2 , 3 ) which has an upper spherical cap ( 13 ) and a lower spherical cap ( 14 ) collaborating respectively with spherical cavities ( 9 ) formed in said upper and lower plates, characterized in that it comprises an annular element ( 5 ) made of a viscoelastic material which is centered around the core ( 4 ) and which comes into contact with bosses ( 12 ) provided on each inner face ( 8 ) of the upper plate ( 2 ) and of the lower plate ( 3 ) so as to restrict and control the movements in bending, inclination and rotation of the upper plate ( 2 ) and of the lower plate ( 3 ) one with respect to the other and about the core ( 4 ), as to ensure stability in the positioning of the core ( 4 ) between the two plates ( 2 , 3 ), and as to avoid fibrous deposits inside the prosthesis ( 1 ).
Claim 2
Dependent Claim
230 words
1 . An intervertebral disk prosthesis comprising an upper plate ( 2 ) and a lower plate ( 3 ) which are anchored respectively to the upper end plate and the lower end plate of the vertebral bodies of the overlying and underlying vertebrae of a spinal column and a central core ( 4 ) placed between the two plates ( 2 , 3 ) which has an upper spherical cap ( 13 ) and a lower spherical cap ( 14 ) collaborating respectively with spherical cavities ( 9 ) formed in said upper and lower plates, characterized in that it comprises an annular element ( 5 ) made of a viscoelastic material which is centered around the core ( 4 ) and which comes into contact with bosses ( 12 ) provided on each inner face ( 8 ) of the upper plate ( 2 ) and of the lower plate ( 3 ) so as to restrict and control the movements in bending, inclination and rotation of the upper plate ( 2 ) and of the lower plate ( 3 ) one with respect to the other and about the core ( 4 ), as to ensure stability in the positioning of the core ( 4 ) between the two plates ( 2 , 3 ), and as to avoid fibrous deposits inside the prosthesis ( 1 ).
Claim 3
Dependent Claim
70 words
2 . The intervertebral disk prosthesis as claimed in claim 1 , characterized in that each plate, the upper plate ( 2 ) and the lower plate ( 3 ), has an outer face ( 6 ) integral with teeth ( 7 ) to allow said plates to become anchored in the respective upper end plate and lower end plate of the vertebral bodies of the overlying and underlying vertebrae.
Claim 4
Dependent Claim
65 words
3 . The intervertebral disk prosthesis as claimed in claim 1 , characterized in that the inner face ( 8 ) of the upper plate ( 2 ) and the lower plate ( 3 ) has a spherical cavity ( 9 ) delimited by a circular rim ( 10 ) which is raised with respect to the horizontal plane of the face ( 8 ).
Claim 5
Dependent Claim
51 words
4 . The intervertebral disk prosthesis as claimed in claim 1 , characterized in that the inner face ( 8 ) has, between the central cavity ( 9 ) of spherical profile and the peripheral edge ( 11 ) of each plate ( 2 , 3 ), bosses ( 12 ).
Claim 6
Dependent Claim
43 words
5 . The intervertebral disk prosthesis as claimed in claim 1 , characterized in that the bosses ( 12 ) are arranged in an arc of a circle in such a way as to be centered about the spherical cavity ( 9 ).
Claim 7
Dependent Claim
51 words
6 . The intervertebral disk prosthesis as claimed in claim 1 , characterized in that the central core ( 4 ) has a peripheral ring ( 15 ) arranged in a horizontal plane and which collaborates with an internal groove ( 17 ) formed in the annular element ( 5 ).
Claim 8
Dependent Claim
84 words
7 . The intervertebral disk prosthesis as claimed in claim 1 , characterized in that the annular element ( 5 ) has a central opening ( 16 ) for the passage of the caps ( 13 , 14 ) of the central core ( 4 ) and an internal groove ( 17 ) opening into the central opening ( 16 ) so as to accommodate the peripheral ring ( 15 ) of said core when the disk prosthesis ( 1 ) is being assembled.
Claim 9
Dependent Claim
34 words
8 . The intervertebral disk prosthesis as claimed in claim 1 , characterized in that the upper plate ( 2 ) and the lower plate ( 3 ) are made of a cobalt/chromium alloy.
Claim 10
Dependent Claim
35 words
9 . The intervertebral disk prosthesis as claimed in claim 1 , characterized in that the central core ( 4 ) is made of a plastic which has very good slip characteristics, such as polyethylene.
Claim 11
Dependent Claim
33 words
10 . The intervertebral disk prosthesis as claimed in claim 1 , characterized in that the annular element ( 5 ) is made of a viscoelastic material such as biocompatible elastomer for example.
References Cited (Backward Citations)
No citation records indexed.
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