WO2012061627A4 - Anatomic total disc replacement - Google Patents

Anatomic total disc replacement Download PDF

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Publication number
WO2012061627A4
WO2012061627A4 PCT/US2011/059203 US2011059203W WO2012061627A4 WO 2012061627 A4 WO2012061627 A4 WO 2012061627A4 US 2011059203 W US2011059203 W US 2011059203W WO 2012061627 A4 WO2012061627 A4 WO 2012061627A4
Authority
WO
WIPO (PCT)
Prior art keywords
intervertebral disc
prosthetic intervertebral
fingers
end cap
nucleus
Prior art date
Application number
PCT/US2011/059203
Other languages
French (fr)
Other versions
WO2012061627A1 (en
Inventor
Clyde T. Carpenter
Original Assignee
Carpenter Clyde T
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carpenter Clyde T filed Critical Carpenter Clyde T
Priority to EP11838828.9A priority Critical patent/EP2635240B1/en
Publication of WO2012061627A1 publication Critical patent/WO2012061627A1/en
Publication of WO2012061627A4 publication Critical patent/WO2012061627A4/en

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    • A61F2/442—Intervertebral or spinal discs, e.g. resilient
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Abstract

An artificial spinal disc prosthesis (20) that can be implanted to replace a damaged natural spinal disc. A nucleus (60) of compressible elastomeric material is surrounded by a winding (70) of a slender strand of flexible tension-bearing material oriented at a pitch angle (71) relative to a central axis. The winding (70) interconnects fingers (72) on an end plate (40) with fingers (74) on an end plate (42). The orientation of the winding (70) provides the prosthesis (20) a limited amount of freedom of movement and flexibility. A pair of end caps (32 and 34) of the disc prosthesis (20) include angulated grooves (94, 96, and 98) that allow for insertion of the prosthesis (20) between vertebral bodies from any of several directions. Special fasteners (36, 38) provide protruding points (93) useful in anchoring the prosthesis (20).

Claims

AMENDED CLAIMS received by the International Bureau on 01 May 2012 (01.05.2012)
1. A prosthetic intervertebral disc comprising:
(a) a resiliently flexible and compressible nucleus having an upper face, a lower face, and a peripheral outer surface extending between said upper and lower faces;
(b) an upper end plate located adjacent said upper face and having a first plurality of fingers extending radially and having respective tips located radially outwardly beyond said peripheral outer surface of said nucleus;
(c) a lower end plate adjacent said lower face and having a second plurality of fingers extending radially and having respective tips located radially outwardly beyond said peripheral outer surface of said nucleus;
(d) a strand of flexible tension-bearing material separate from the nucleus extending around one of the first plurality of fingers and to and around a respective one of the second plurality of fingers, separate from but adjacent said peripheral outer surface of said nucleus as a winding interconnecting said upper and lower end plates with each other; and
(e) a respective end cap covering each of said end plates and attached thereto by at least one threaded fastener extending through said end cap and engaged in a respective threaded bore defined in the respective one of said end plates, each said end cap including a peripheral rim extending axially of the prosthetic intervertebral disc and located closely outwardly adjacent to and surrounding a part of the respective end plate to which it is attached including said tips of said fingers and preventing said winding from being disengaged from said fingers.
2. The prosthetic intervertebral disc of claim 1 wherein said mechanical fastener has an outer end standing proud of an end surface of said end cap so as to be available to extend into a vertebral body.
3. The prosthetic intervertebral disc of claim 1 wherein said nucleus includes an outer membrane surrounding and containing a quantity of a gel material.
4. The prosthetic intervertebral disc of claim 3 wherein said gel material is an elastomeric material.
5. The prosthetic intervertebral disc of claim 3 wherein said gel material is a hydrogel.
6. The prosthetic intervertebral disc of claim 1 wherein said nucleus includes an outer membrane surrounding and containing a quantity of water.
7. The prosthetic intervertebral disc of claim 1 wherein each of said end caps has a respective thickness selected to establish a predetermined height of said prosthetic intervertebral disc.
8. The prosthetic intervertebral disc of claim 1 wherein one of said end caps has an outer face having a generally convex surface shape.
9. The prosthetic intervertebral disc of claim 1 wherein said strand of flexible tension-bearing material is arranged in said winding as a plurality of legs each extending at a respective first pitch angle between respective ones of the pluralities of fingers.
10. The prosthetic intervertebral disc of claim 9 including a second strand of flexible tension-bearing material arranged in said winding as a plurality of legs each extending at a respective second pitch angle opposite to said first pitch angle, between respective ones of the pluralities of fingers.
11. The prosthetic intervertebral disc of claim 1 wherein one of said end plates includes at least one boss defining said respective threaded bore for receiving said fastener, and wherein said end cap attached to said one of said end plates defines a respective socket in a corresponding location to receive each said boss and thereby to align said end cap with said one of said end plates. 22
12. The prosthetic intervertebral disc of claim 1 wherein said tips of said fingers extend arcuately toward the respective adjacent one of said end caps, the fingers thereby defining hooks around which said strand of flexible tension-bearing material extends.
13. The prosthetic intervertebral disc of claim 1 wherein said tips of said fingers extend toward the respective adjacent one of said end caps, and wherein said peripheral rim of said one of said end caps is located in contact with said tips of said fingers.
14. The prosthetic intervertebral disc of claim 1 wherein said at least one threaded fastener has a sharp outer end extending proud of said end cap.
15. The prosthetic intervertebral disc of claim 1 wherein each said respective end cap has an exterior surface that is coated with a porous ingrowth material.
16. The prosthetic intervertebral disc of claim 15 wherein the porous ingrowth material is selected from hydroxyapatite, biochemical agents, small fibers, tumor necrosis factor, and polycrystalline alumina.
17. The prosthetic intervertebral disc of claim 1 wherein each said respective end cap has at least three mutually intersecting mounting grooves defined in an outer end surface and wherein each said respective end cap is attached to a respective one of said end plates by at least four of said threaded fasteners each located on said end cap between and clear of said mounting grooves.
PCT/US2011/059203 2010-11-04 2011-11-03 Anatomic total disc replacement WO2012061627A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11838828.9A EP2635240B1 (en) 2010-11-04 2011-11-03 Anatomic total disc replacement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/927,079 US8353964B2 (en) 2010-11-04 2010-11-04 Anatomic total disc replacement
US12/927,079 2010-11-04

Publications (2)

Publication Number Publication Date
WO2012061627A1 WO2012061627A1 (en) 2012-05-10
WO2012061627A4 true WO2012061627A4 (en) 2012-07-05

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US (2) US8353964B2 (en)
EP (1) EP2635240B1 (en)
WO (1) WO2012061627A1 (en)

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US7153325B2 (en) * 2003-08-01 2006-12-26 Ultra-Kinetics, Inc. Prosthetic intervertebral disc and methods for using the same
US7976578B2 (en) * 2008-06-04 2011-07-12 James Marvel Buffer for a human joint and method of arthroscopically inserting
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US9295560B2 (en) 2016-03-29
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US20130131806A1 (en) 2013-05-23
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