EP0747025B1
Expired / Lapsed
EP
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Low wear artificial spinal disc
Assignee: Surgical Dynamics Inc
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Filing: 1996-06-06
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Granted: 2002-09-11
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Expires: 2016-06-06
Abstract
Abstract An artificial spinal disc (10) for surgical placement between adjacent vertebrae including a first component (20) for attaching to a first vertebrae, the first component (20) having a concave recess (28), with the concave contoured surface having a circumference of 360 DEG . A second component (30) for attaching to a second vertebrae, the second component (30) including a projection (38) with a convex surface, the convex contoured surface having a circumference of 360 DEG . The corresponding contoured surfaces are shaped to allow an unrestricted rotational and a flexion/extension bending motion between the first (20) and second (30) components relative to a patient's normal spinal axis when in a standing position with the spine in a straightened position. <IMAGE>
Inventors
- 👤 Yuan A. Hansen
- 👤 Chih-I Lin
- 👤 James A. Davidson
- 👤 Laura C. Small
- 👤 Thomas A. Carls
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 19:16
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/44; A61F2/442; A61F2/4425; A61L; A61L27/00; A61L27/02; A61L27/04; A61L27/045; A61F2/30767; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30016; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30133; A61F2002/30316; A61F2002/30329; A61F2002/30383; A61F2002/3039; A61F2002/30398; A61F2002/30621; A61F2002/30649; A61F2/30771; A61F2002/30841; A61F2002/30878; A61F2002/30891; A61F2002/30892; A61F2002/30922; A61F2002/443; A61F2220/00; A61F2220/0025; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0015; A61F2250/00; A61F2250/0014; A61F2250/0019; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017; A61F2310/00023; A61F2310/00029; A61F2310/00035; A61F2310/00089; A61F2310/00179; A61F2310/00293; A61F2310/00389; A61F2310/00395; A61F2310/00419; A61F2310/00449; Y; Y10; Y10S; Y10S606/00; Y10S606/907
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
222 words
An artificial spinal disc (10, 10A) for surgical
placement between first and second adjacent
vertebrae of a patient's spine, comprising: (a) a first component (20) for attaching to the first
vertebrae, said first component (20) including a
periphery (21), an inner side (26) and in the centre
of the inner side a concave recess (28), the concave
contoured surface of the recess having a
circumference of 360°; (b) a second component (30) for attaching to the second
vertebrae, said second component (30) including a
periphery (31), an inner side (36) and in the centre
of the inner side a projection (38) that fits the
concave recess (28) of the first component (20), the
projection (38) having a convex contoured surface
having a circumference of 360°; (c) the corresponding fitting concave and convex
contoured surfaces being configured so as to allow an
unrestricted rotational and a flexion / extension
bending motion between the first and second
components (20, 30) relative to a patient's normal
spinal axis when in a standing position with the
spine in the straightened position; characterized in that : the inner side (26) of the supporting block (20) and
the inner side (36) of the bearing block (30) are
curved surfaces which blend gradually into the
respective convex or concave contoured surface (38,
28) and the respective periphery (21, 31).
Claim 2
Dependent Claim
30 words
The artificial spinal disc of claim 1, wherein at
least one of the surfaces is formed from a chromium-containing
metal having a chromium content in excess
of 15 weight percent.
Claim 3
Dependent Claim
21 words
The artificial spinal disc of claim 1, wherein at
least one of the contoured surfaces is formed from a
cobalt-chromium-molybdenum alloy.
Claim 4
Dependent Claim
35 words
The artificial spinal disc of claim 1, wherein at
least one of the contoured surfaces is coated with a
cobalt-chromium-molybdenum tantalum alloy with
tantalum replacing the cobalt and being less than
about 5 weight percent.
Claim 5
Dependent Claim
33 words
The artificial spinal disc of an one of the preceding
claims, wherein the first (20) and second (30)
component include anchoring means (24, 34) for
attachment to the respective first and second
vertebrae.
Claim 6
Dependent Claim
23 words
The artificial spinal disc of claim 5, wherein the
anchoring means (24, 34) includes a porous-coated or
macro-textured surface to facilitate bone ingrowth.
Claim 7
Dependent Claim
32 words
An artificial spinal disc of any one of the preceding
claims, wherein the components are generally oval in
shape with the contoured surfaces being positioned
approximately in the centre of the component.
Claim 8
Dependent Claim
41 words
An artificial spinal disc of any one of the preceding
claims, wherein the first and second components are
configured so as to allow the artificial spinal disc
to be implanted as one unit in a process in which
over-distraction is eliminated.
Claim 9
Dependent Claim
47 words
The artificial spinal disc of any one of the preceding
claims, wherein at least one of the components
comprises a base portion (40) and a bearing portion,
and wherein at least one of the base portions of a
component includes means for translation between the
bearing portions.
Claim 10
Dependent Claim
48 words
The artificial spinal disc of any of the preceding
claims, wherein at least one of the components
comprises a base portion (40) and a bearing portion,
and wherein at least one of the base portions is
formed from a material different from the material of
the bearing portion.
Claim 11
Dependent Claim
71 words
An artificial spinal disc as claimed in any one of the
preceding claims wherein the first (20) and second
components (30) are configured so as to allow the
artificial spinal disc to be implanted as one unit in
a process in which openings in bone of the adjacent
vertebrae are created in order to allow the artificial
spinal disc (10, 10A) to be slid into place so as to
prevent over-distraction.
References Cited (Backward Citations)
No citation records indexed.
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