US5314477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthesis for intervertebral discs and instruments for implanting it
Assignee: DePuy Spine LLC
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Filing: 1991-03-04
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Granted: 1994-05-24
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Expires: 2011-03-04
Abstract
Abstract The invention concerns a prosthesis for intervertebral discs designed to be substituted for fibrocartilaginous discs ensuring connection between the vertebrae of the spinal column and its instruments for implantation. The prosthesis is composed mainly of two plates (110, 120) each equipped with anchoring flaps (1110, 1210) separated by a joint (20) composed of a spherical cap (21) with a cylindrical base (22), of the same diameter, made in the upper side of the lower plate (120). Each of the plates (110, 120) includes, on the back, threaded holes (115, 116, 125, 126) located parallel to the anchoring flaps (1110, 1210).
Inventors
- 👤 Thierry Marnay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:40
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/46; A61F2/4603; A61F2/4611; A61F2/44; A61F2/442; A61F2/4425; A61B; A61B17/00; A61B17/02; A61B17/025; A61B2017/0256; A61F2002/30001; A61F2002/30621; A61F2002/30649; A61F2002/30662; A61F2/30767; A61F2/30771; A61F2002/30795; A61F2002/30797; A61F2002/30807; A61F2002/30808; A61F2002/30841; A61F2002/30878; A61F2002/30884; A61F2002/30891; A61F2002/30892; A61F2002/30904; A61F2002/443; A61F2002/4622; A61F2002/4625; A61F2002/4628; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32549
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
136 words
An intervertebral disc prosthesis for placement in a lateral direction between vertebrae, each vertebra having a pair of mortises cut into the vertebra in the lateral direction, said prosthesis comprising: a cap having a convex bearing surface and an opposite mounting surface; a first plate having a vertebra-contacting surface and an opposite cap-retaining surface including a cavity receiving said cap mounting surface in a fixed orientation with respect to said first plate; and a second plate having a vertebra-contacting surface and an opposite concave bearing surface, said bearing surfaces cooperating to provide a pivoting joint between said plates, said vertebra-contacting surfaces each having a pair of anchoring flaps extending from said vertebra-contacting surface toward respective vertebra, said flaps being sized to engage said mortises when said prosthesis is inserted between said vertebrae in said lateral direction.
Claim 2
Dependent Claim
136 words
An intervertebral disc prosthesis for placement in a lateral direction between vertebrae, each vertebra having a pair of mortises cut into the vertebra in the lateral direction, said prosthesis comprising: a cap having a convex bearing surface and an opposite mounting surface; a first plate having a vertebra-contacting surface and an opposite cap-retaining surface including a cavity receiving said cap mounting surface in a fixed orientation with respect to said first plate; and a second plate having a vertebra-contacting surface and an opposite concave bearing surface, said bearing surfaces cooperating to provide a pivoting joint between said plates, said vertebra-contacting surfaces each having a pair of anchoring flaps extending from said vertebra-contacting surface toward respective vertebra, said flaps being sized to engage said mortises when said prosthesis is inserted between said vertebrae in said lateral direction.
Claim 3
Dependent Claim
58 words
A prosthesis according to claim 1, characterized by the fact that the angular clearance of the first (120) and the second (110) plates, one in relation to the other, is limited by two-step flanges (113, 123), with complementary sections, located respectively on the periphery of the second plate (110) and on the periphery of the first plate (120).
Claim 4
Dependent Claim
35 words
A prosthesis according to claim 2, characterized by the fact that the two-step flange (123) placed in the first plate (120) extends from the periphery of said cavity to the periphery of said plate (120).
Claim 5
Dependent Claim
37 words
A prosthesis according to claim 2, characterized by the fact that the two-step flange (113) in the second plate (110) extends from the periphery of said concave bearing surface to the periphery of said second plate (110).
Claim 6
Dependent Claim
63 words
A prosthesis according to claim 4, characterized by the fact that the cavity is cylindrical and that the diameter of the cylindrical cavity (122) and the geometric characteristics of the two-step flanges (113) (123) are determined so that when said flanges (112, 123) overlap, the maximum relative angular staggering of the plates (110, 120) corresponds to that which exists naturally between two vertebrae.
Claim 7
Dependent Claim
83 words
A prosthesis according to claim 3, characterized by the fact that the two-step flange (113) of the second plate (110) is composed of the junction of an annular surface (112) inclined toward the vertebra-contacting surface of said second plate (110) at an angle of around 10° from the periphery of said annular surface, and another annular surface (114) from the periphery of said concave bearing surface forming an angle of around 70° in relation to the vertebra-contacting surface of the second plate (110).
Claim 8
Dependent Claim
78 words
A prosthesis according to claim 4, characterized by the fact that the two-step flange (123) of the first plate (120) is composed of the junction of an annular surface (124) raised at an angle of around 20° in relation to the vertebra-contacting surface of said first plate (120), and another annular surface (127) from the periphery of the cylindrical cavity (122) forming an angle of around 60° in relation to the vertebra-contacting surface of the first plate (120).
Claim 9
Dependent Claim
62 words
A prosthesis according to claim 1, characterized by the fact that the cavity is cylindrical, the cap mounting surface is flat and circular and that the cap mounting surface (22) is supported in the bottom of the cylindrical cavity (122) by a circular washer, made of a flexible material (30) with a diameter less than that of the cap mounting surface (22).
Claim 10
Dependent Claim
27 words
A prosthesis according to claim 1, characterized by the fact that the anchoring flaps (1110, 1210) of the plates (110, 120) have a toothed extremity (1111, 1211).
Claim 11
Dependent Claim
40 words
A prosthesis according to claim 9, characterized by the fact that each tooth of the toothed extremities has an inclined edge oriented to resist movement opposite to the direction in which the flaps are placed into said mortises (401, 411).
Claim 12
Dependent Claim
32 words
A prosthesis according to claim 1, characterized by the fact the flaps (1110, 1210) have a thickness near the vertebra-contacting surfaces that is somewhat greater than the width of the respective mortises.
Claim 13
Dependent Claim
37 words
A prosthesis according to claim 1, characterized by the fact that the plates (110, 120) and flaps (1110, 1210) are made of titanium, or titanium alloy, plasma treated on all surfaces coming into contact with the vertebrae.
Claim 14
Dependent Claim
17 words
A prosthesis according to claim 1, characterized by the fact that the cap is made of polyethylene.
References Cited (Backward Citations)
US566360A
Cited
US1436573A
Cited
US2836442A
Cited
US3325197A
Cited
FR2124815A5
Cited
DE2263842A1
Cited
US3857642A
Cited
US4074542A
Cited
FR2372622A1
Cited
DE3023353A1
Cited
EP0042271A1
Cited
EP0176728B1
Cited
US4655778A
Cited
US4756711A
Cited
US4787908A
Cited
US4997432A
Cited
EP0333990B1
Cited
US5041139A
Cited
US4955916A
Cited
WO1991007931A1
Cited
US5246458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 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 |