CA2451359A1 - Artificial intervertebral disc having a wave washer force restoring element - Google Patents

Artificial intervertebral disc having a wave washer force restoring element Download PDF

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Publication number
CA2451359A1
CA2451359A1 CA002451359A CA2451359A CA2451359A1 CA 2451359 A1 CA2451359 A1 CA 2451359A1 CA 002451359 A CA002451359 A CA 002451359A CA 2451359 A CA2451359 A CA 2451359A CA 2451359 A1 CA2451359 A1 CA 2451359A1
Authority
CA
Canada
Prior art keywords
wave washer
spacer device
intervertebral spacer
plates
semispherical
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002451359A
Other languages
French (fr)
Other versions
CA2451359C (en
Inventor
James D. Ralph
Stephen Tatar
Joseph P. Errico
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Spinecore Inc
Original Assignee
Third Millenium Engineering Llc
James D. Ralph
Stephen Tatar
Joseph P. Errico
Spinecore, Inc.
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
Priority claimed from US09/906,118 external-priority patent/US6527806B2/en
Priority claimed from US09/906,117 external-priority patent/US6468310B1/en
Application filed by Third Millenium Engineering Llc, James D. Ralph, Stephen Tatar, Joseph P. Errico, Spinecore, Inc. filed Critical Third Millenium Engineering Llc
Publication of CA2451359A1 publication Critical patent/CA2451359A1/en
Application granted granted Critical
Publication of CA2451359C publication Critical patent/CA2451359C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

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    • A61F2310/00365—Proteins; Polypeptides; Degradation products thereof

Abstract

An artificial disc having a pair of opposing plates (100b) for seating against opposing vertebral bone surfaces, separated by a wave washer (200a) having a circumferential extent surrounding a central bore. Various wave washer embodiments disclosed include circumferential extents that are ring-shaped, spiral-shaped, straight, bowed, grooved, wavy, thinning, thickening, and slotted. Various central bores disclosed include simple bores and bores that form a curved socket. Various plate embodiments disclosed includeplates having, on inwardly facing surfaces, a flat surface, a circular recess, a ball-shaped protuberance that is mateable with the curvate socket. The wave washers (200a) are disposable between the plates (100b), through various disclosed coupling, so that t he plates (100b) compress, rotate and angulate freely relative to one another, enabling the artificial disc to mimic a healthy natural intervertebral disc.

Claims (97)

What is claimed is:
1. An intervertebral spacer device, comprising:
first and second plates, said plates being disposed iii a spaced apart relationship such that a plate surface of said first plate faces a plate surface of said second plate, said facing surfaces being inner surfaces, and alternative faces of each plate being outer surfaces; and at least one restoring force providing element disposed between the inner surfaces of said first and second plates, and disposed such that a compressive load applied to the outer surfaces of said first and second plates is counteracted by said at least one restoring force providing element, said at least one restoring force providing element including at least one wave washer.
2. The intervertebral spacer device of claim 1, wherein the at least one wave washer comprises a plurality of wave washers.
3. The intervertebral spacer device of claim 1, wherein the at least one wave washer has a circumferential extent having at least one slot.
4. The intervertebral spacer device of claim 3, wherein the at least one slot comprises at least one radially extending slot.
5. The intervertebral spacer device of claim 3, wherein the at least one slot comprises at least one radially extending and curving slot.
6. The intervertebral spacer device of claim 3, wherein the at least one slot passes partially through the circumferential extent.
The intervertebral spacer device of claim 3, wherein the at least one slot comprises a single radial slot passing completely through the circumferential extent.
8. The intervertebral spacer device of claim 1, wherein the at least one wave washer comprises at least one ring-shaped wave washer.
9. The intervertebral spacer device of claim 8, wherein the of least one ring-shaped wave washer has a circumferential extent having at least one radially extending slot.
20. The intervertebral spacer device of claim 9, wherein the circumferential extent has a single radially extending slot that passes completely through the circumferential extent.
11. The intervertebral spacer device of claim 9, wherein the at least one radially extending slot comprises at least one radially extending slot that passes partially through the circumferential extent.
12. The intervertebral spacer device of claim 8, wherein the at least one wave washer comprises a plurality of ring-shaped wave washers.
13. The intervertebral spacer device of claim 12, wherein the plurality of ring-shaped wave washers comprises a plurality of ring-shaped wave washers concentrically disposed relative to one another.
14. The intervertebral spacer device of claim 13, wherein the plurality of concentrically disposed ring-shaped wave washers has a radially diminishing amplitude.
15. The intervertebral spacer device of claim 1, wherein the at least one wave washer comprises at least one spiral-shaped wave washer.
16. The intervertebral spacer device of claim 15, wherein the spiral-shaped wave washer has a radially diminishing amplitude.
17. The intervertebral spacer device of claim 1, wherein at least one of said first and second plates comprises a wave washer securing element mounted to the inner surface thereof.
18. The intervertebral spacer device of claim 17, wherein the wave washer securing element comprises a fastener.
19. The intervertebral spacer device of claim 17, wherein the wave washer securing element comprises a flanged fastener.
20. The intervertebral spacer device of claim 19, wherein the wave washer securing element comprises a post having at least one laterally extending spoke.
21. The intervertebral spacer device of claim 20, wherein the post is rotatable relative to the at least one of said first and second plates to which the post is mounted.
22. The intervertebral spacer device of claim 20, wherein the at least one laterally extending spoke comprises a plurality of laterally extending spokes, and the at least one wave washer is secured to the at least one of said first and second plates with a circumferential extent of the at least one wave washer being maintained, between the spokes and the at least one of said first and second plates.
23. The intervertebral spacer device of claim 22, wherein each spoke extends parallel to a wave of the at least one wave washer.
24. The intervertebral spacer device of claim 19, wherein the flanged fastener has a post portion and a flanged portion, and wherein the post portion has a diameter smaller than a diameter of a central bore of the at least one wave washer, and a length greater than a thickness of a portion of a circumferential extent of the at least one wave washer surrounding the central bore, and wherein the flanged portion has a diameter greater than a diameter of the central bore, and wherein the at least one wave washer is secured to the at least one of said first and second plates with the circumferential extent portion surrounding the central bore being maintained, between the flanged portion and the at least one of said first and second plates, such that the at least one wave washer is free to rotate relative to the at least one of said first and second plates.
25. The intervertebral spacer device of claim 1, wherein at least one of said first and second plates comprises a circular recess within which an end of the at least one wave washer is disposed.
26. The intervertebral spacer device of claim 25, further comprising a retaining element fastened to the at least one of said first and second plates having the circular recess, the retaining element preventing the dislocation of the end of the at least one wave washer from the circular recess.
27. The intervertebral spacer device of claim 26, wherein the retaining element comprises a shield.
28. The intervertebral spacer device of claim 1, wherein the at least one wave washer has a central bore forming a curvate socket and at least one of said first and second plates has on its inner surface a semispherical protuberance that is couplable to the curvate socket.
29. The intervertebral spacer device of claim 28, wherein the semispherical protuberance comprises at least one radial slot such that the semispherical protuberance is radially deflectable upon the application of a radially inwardly directed force.
30. The intervertebral spacer device of claim 29, wherein the semispherical protuberance further comprises an axial bore into which a deflection preventing element is disposable to prevent the radial deflection of the semispherical protuberance.
31. The intervertebral spacer device of claim 30, wherein the deflection preventing element comprises a rivet.
32. The intervertebral spacer device of claim 28, wherein the semispherical protuberance is rotatably and angulatably coupleable to the curvate socket.
33. The intervertebral spacer device of claim 32, wherein the semispherical protrusion comprises a radially deflectable semispherical portion and the curvate socket has an interior volume and an opening leading to the interior volume, the curvate socket accommodating the semispherical portion for free rotation and angulation therein, the semispherical portion fitting through the opening only when radially deflected, the semispherical portion being adapted to receive a deflection preventing element that when applied to the semispherical portion prevents the semispherical portion from fitting through the opening.
34. The intervertebral spacer device of claim 1, wherein the at least one wave washer has a circumferential extent having a thickness that is radially varying.
35. The intervertebral spacer device of claim 34, wherein the circumferential extent is thicker at an inner portion of the extent as compared with an outer portion of the extent.
36. The intervertebral spacer device of claim 34, wherein the circumferential extent is thinner at an inner portion of the extent as compared with an outer portion of the extent.
37. The intervertebral spacer device of claim 1, wherein the at least one wave washer has a circumferential extent that is radially wavy.
38. The intervertebral spacer device of claim 1, wherein the at least one wave washer has a circumferential extent that has at least one concentric groove.
39. The intervertebral spacer device of claim 38, wherein the at least one concentric groove includes a plurality of radially spaced concentric grooves, at least one of the plurality of radially spaced concentric grooves having a length.
40. The intervertebral spacer device of claim 39, wherein the at least one of the plurality of radially spaced concentric grooves has a depth and a width, and at least one of the width and the depth is uniform along the length.
41. The intervertebral spacer device of claim 39, wherein the at least one of the plurality of radially spaced concentric grooves has a depth and a width, and at least one of the width and the depth varies along the length.
42. The intervertebral spacer device of claim 39, wherein each of the plurality of radially spaced concentric grooves has a respective length, a respective depth along the respective length, and a respective width along the respective length, and wherein at least one of the depths is different than at least one other of the depths, and wherein at least one of the widths is different than at least one other of the widths.
43. The intervertebral spacer device of claim 42, wherein each of the plurality of radially spaced concentric grooves is at a respective distance from an outer edge of the circumferential extent, wherein the depths increase incrementally with decreasing said distances, and the widths increase incrementally with decreasing said distances.
44. The intervertebral spacer device of claim 42, wherein each of the plurality of radially spaced concentric grooves is at a respective distance from an outer edge of the circumferential extent, wherein the depths decrease incrementally with decreasing said distances, and the widths decrease incrementally with decreasing said distances.
45. The intervertebral spacer device of claim 1, wherein the at least one wave washer has a circumferential extent having at least one radially extending wave valley having a depth and a width, wherein at least one of the depth and the width of the valley radially varies.
46. The intervertebral spacer device of claim 45, wherein the depth and the width increase incrementally with increasing radial distance from a central bore of the at least one wave washer.
47. The intervertebral spacer device of claim 1, wherein the at least one wave washer comprises at least one conical-shaped wave washer.
48. The intervertebral spacer device of claim 47, wherein the at least one conical-shaped wave washer has a circumferential extent having at least one radially extending slot.
49. The intervertebral spacer device of claim 47, wherein the at least one conical-shaped wave washer has a circumferential extent having at least one radially extending and curving slot.
50. The intervertebral spacer device of claim 47, wherein the at least one conical-shaped wave washer has a central bore forming a curvate socket and at least one of said first and second plates has on its inner surface a semispherical protuberance that is rotatably and angulatably couplable to the curvate socket.
51. The intervertebral spacer device of claim 1, wherein the at least one wave washer is comprises at least one semispherical-shaped wave washer.
52. The intervertebral spacer device of claim 51, wherein the at least one semispherical-shaped wave washer has a circumferential extent having at least one radially extending slot.
53. The intervertebral spacer device of claim 51, wherein the at least one semispherical-shaped wave washer has a circumferential extent having at least one radially extending and curving slot.
54. The intervertebral spacer device of claim 51, wherein the at least one semispherical-shaped wave washer has a central bore forming a curvate socket and at least one of said first and second plates has on its inner surface a semispherical protuberance that is rotatably and angulatably couplable to the curvate socket.
55. The intervertebral spacer device of claim 1, wherein the at least one wave washer comprises a central bore from which an upwardly extending circumferential extent portion extends, and from which central bore a downwardly extending circumferential extent portion extends.
56. The intervertebral spacer device of claim 55, wherein at least one of the portions is conical-shaped.
57. The intervertebral spacer device of claim 55, wherein at least one of the portions is semispherical shaped.
58. The intervertebral spacer device of claim 1, wherein at least one of said first and second plates comprises on its outer surface an element that is deformably reshapeable under anatomical loads to securably engage a vertebral body endplate.
59. The intervertebral spacer device of claim 58, wherein said convex element comprises a mesh.
60. The intervertebral spacer device of claim 59, wherein the mesh has a resting shape in the shape of a dome convexly extending from the at least one of said first and second plates.
61. The intervertebral spacer device of claim 59, wherein the mesh is laser-welded to the at least one of said first and second plates.
62. The intervertebral spacer device of claim 59, wherein the mesh comprises titanium.
63. The intervertebral spacer device of claim 59, further comprising an osteoconductive feature adjacent the mesh.
64. The intervertebral spacer device of claim 63, wherein the osteoconductive feature adjacent the mesh comprises a porous area on the at least one of said first and second plates.
65. An artificial intervertebral disc, comprising:
first and second plates disposed to provide opposed respective inwardly facing support surfaces of said plates, and to provide respective outwardly facing surfaces of said plates; and at least one wave washer disposed between the inwardly facing support surfaces such that a compressive load applied to the outwardly facing surfaces is resisted by said at least one wave washer; wherein said at least one wave washer includes a central bore forming a curvate socket;
and wherein at least one of said first and second plates includes on its inwardly facing support surface a semispherical protuberance that is rotatably and angulatably couplable to the curvate socket such that the plates are rotatable and angulatable relative to one another thereby.
66. The artificial intervertebral disc of claim 65, wherein the semispherical protrusion comprises a radially deflectable semispherical portion and the curvate socket has an interior volume and an opening leading to the interior volume, the curvate socket accommodating the semispherical portion for free rotation and angulation therein, the semispherical portion fitting through the opening only when radially deflected, the semispherical portion being adapted to receive a deflection preventing element that when applied to the semispherical portion prevents the semispherical portion from fitting through the opening.
67. The artificial intervertebral disc of claim 66, wherein the semispherical protuberance comprises at least one radial slot such that the semispherical protuberance is radially deflectable upon the application of a radially inwardly directed force.
68. The artificial intervertebral disc of claim 67, wherein the semispherical protuberance further comprises an axial bore into which the deflection preventing element is disposable to prevent the radial deflection of the semispherical protuberance.
69. The artificial intervertebral disc of claim 68, wherein the deflection preventing element comprises a rivet.
70. The artificial intervertebral disc of claim 65, wherein the at least one wave washer is selected from the group consisting of a ring-shaped wave washer, a spiral-shaped wave washer, a conical-shaped wave washer, and a semispherical-shaped wave washer.
71. The artificial intervertebral disc of claim 70, wherein the at least one wave washer is disposed concentrically with at least one other wave washer.
72. The artificial intervertebral disc of claim 71, wherein the plurality of concentrically disposed wave washers has a radially diminishing amplitude.
73. The artificial intervertebral disc of claim 70, wherein the spiral-shaped wave washer has a radially diminishing amplitude.
74. The artificial intervertebral disc of claim 70, wherein the at least one wave washer has a circumferential extent comprising at least one radially extending slot.
75. The artificial intervertebral disc of claim 74, wherein the at least one radially extending slot comprises at least one radially extending and curving slot.
76. The artificial intervertebral disc of claim 65, wherein at least one of said first and second plates comprises a circular recess, on its inwardly facing support surface, within which an end of the at least one wave washer is disposed.
77. The artificial intervertebral disc of claim 76, further comprising a retaining element fastened to the at least one of said first and second plates having the circular recess, the retaining element preventing the dislocation of the end of the at least one wave washer from the circular recess.
78. The artificial intervertebral disc of claim 77, wherein the retaining element comprises a shield.
79. The artificial intervertebral disc of claim 65, wherein at least one of the outwardly facing surfaces comprises a vertebral body contact element that is deformably reshapable under anatomical loads to securably engage a vertebral body endplate.
80. An artificial intervertebral disc, comprising:
first and second plates disposed to provide opposed respective inwardly facing support surfaces of said plates, and to provide respective outwardly facing surfaces of said plates; and at least one wave washer rotatably coupled to the inwardly facing support surface of at least one of said first and second plates by a wave washer securing element such that the plates are made rotatable relative to one another thereby, and such that a compressive load applied to the outwardly facing surfaces is resisted by said at least one wave washer.
81. The artificial intervertebral disc of claim 80, wherein the wave washer securing element comprises a fastener.
82. The artificial intervertebral disc of claim 80, wherein the wave washer securing element comprises a flanged fastener.
83. The artificial intervertebral disc of claim 82, wherein the wave washer securing element comprises a post having at least one laterally extending spoke.
84. The artificial intervertebral disc of claim 83, wherein the post is rotatable relative to the at least one of said first and second plates.
85. The artificial intervertebral disc of claim 83, wherein the at least one laterally extending spoke comprises a plurality of laterally extending spokes, and the at least one wave washer is secured to the at least one of said first and second plates with a circumferential extent of the at least one wave washer being maintained, between the spokes and the at least one of said first and second plates.
86. The artificial intervertebral disc of claim 85, wherein each spoke extends parallel to a wave of said at least one wave washer.
87. The artificial intervertebral disc of claim 82, wherein the flanged fastener has a post portion and a flanged portion, and wherein the post portion has a diameter smaller than a diameter of a central bore of said at least one wave washer, and a length greater than a thickness of a portion of a circumferential extent of said at least one wave washer surrounding the central bore, and wherein the flanged portion has a diameter greater than a diameter of the central bore, and wherein said at least one wave washer is secured to the at least one of said first and second plates with the circumferential extent portion surrounding the central bore being maintained, between the flanged portion and the at least one of said first and second plates, such that said at least one wave washer is rotatable relative to the at least one of said first and second plates.
88. The artificial intervertebral disc of claim 80, wherein said at least one wave washer is selected from the group consisting of a ring-shaped wave washer, a spiral-shaped wave washer, a conical-shaped wave washer, a semispherical-shaped wave washer, and a plurality of wave washers..
89. The artificial intervertebral disc of claim 88, wherein the plurality of wave washers comprises a plurality of ring-shaped wave washers concentrically disposed relative to one another.
90. The artificial intervertebral disc of claim 89, wherein the plurality of concentrically disposed ring-shaped wave washers has a radially diminishing amplitude.
91. The artificial intervertebral disc of claim 88, wherein the spiral-shaped wave washer has a radially diminishing amplitude.
92. The artificial intervertebral disc of claim 88, wherein said at least one wave washer has a circumferential extent comprising at least one radially extending slot.
93. The artificial intervertebral disc of claim 92, wherein the at least one radially extending slot comprises at least one radially extending and curving slot.
94. The artificial intervertebral disc of claim 80, wherein at least one of said first and second plates comprises a circular recess, on its inwardly facing support surface, within which an end of said at least one wave washer is disposed.
95. The artificial intervertebral disc of claim 94, further comprising a retaining element fastened to the at least one of said first and second plates having the circular recess, the retaining element preventing the dislocation of the end of said at least one wave washer from the circular recess.
96. The artificial intervertebral disc of claim 95, wherein the retaining element comprises a shield.
97. The artificial intervertebral disc of claim 80, wherein at least one of the outwardly facing surface comprises a vertebral body contact element that is deformably reshapable under anatomical loads to securably engage a vertebral body endplate.
CA2451359A 2001-07-16 2002-06-19 Artificial intervertebral disc having a wave washer force restoring element Expired - Fee Related CA2451359C (en)

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US09/906,118 2001-07-16
US09/906,117 2001-07-16
US09/906,117 US6468310B1 (en) 2001-07-16 2001-07-16 Intervertebral spacer device having a wave washer force restoring element
PCT/US2002/019659 WO2003007780A2 (en) 2001-07-16 2002-06-19 Artificial intervertebral disc having a wave washer force restoring element

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US7314486B2 (en) 2008-01-01
DE60231718D1 (en) 2009-05-07
EP1414333A4 (en) 2007-02-14
US6723127B2 (en) 2004-04-20
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CA2451359C (en) 2010-05-04
WO2003007780A3 (en) 2003-04-10
AU2002322278B2 (en) 2007-03-22
EP1414333A2 (en) 2004-05-06
WO2003007780A2 (en) 2003-01-30
EP1414333B1 (en) 2009-03-25
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US20040236426A1 (en) 2004-11-25
US20030014112A1 (en) 2003-01-16

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