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United States Patent 6,966,929
Mitchell November 22, 2005
Artificial vertebral disk replacement implant with a spacer


Abstract

The present invention is directed to a device that can be placed between two vertebrae. The implant is characterized by having a first plate and a second plate with a spacer therebetween. The spacer fits within cavities on each of the first and second plate.

Inventors: Mitchell; Steve (Pleasant Hill, CA)
Assignee: St. Francis Medical Technologies, Inc. (Alameda, CA)
Appl. No.: 10/685,011
Filed: October 14, 2003

Current U.S. Class: 623/17.11
Field of Search: 623/17.13,17.14,17.15,17.16

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Primary Examiner: Robert; Eduardo C.
Assistant Examiner: Reimers; Annette
Attorney, Agent or Firm: Fliesler Meyer LLP
Parent Case Text


CLAIM OF PRIORITY

This application claims priority to U.S. Provisional Application No. 60/422,022, which was filed Oct. 29, 2002, entitled "ARTIFICIAL VERTEBRAL DISK REPLACEMENT IMPLANT WITH A SPACER AND METHOD," which is incorporated herein by reference.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is related to U.S. Provisional Application No. 60/422,039, filed Oct. 29, 2002, entitled "ARTIFICIAL VERTEBRAL DISK REPLACEMENT IMPLANT WITH TRANSLATING PIVOT POINT AND METHOD", U.S. patent application Ser. No. 10,684,669, filed Oct. 14, 2003, entitled "ARTIFICIAL VERTEBRAL DISK REPLACEMENT IMPLANT WITH TRANSLATING PIVOT POINT AND METHOD", U.S. Provisional Application No. 60/422,021, filed Oct. 29, 2002, entitled "ARTIFICIAL VERTEBRAL DISK REPLACEMENT IMPLANT WITH CROSSBAR SPACER AND METHOD", U.S. patent application Ser. No. 10/684,668, filed Oct. 14, 2003, entitled "ARTIFICIAL VERTEBRAL DISK REPLACEMENT IMPLANT WITH CROSSBAR SPACER AND METHOD", U.S. Provisional Application No. 60/422,011, filed Oct. 29, 2002, entitled "TOOLS FOR IMPLANTING AN ARTIFICIAL VERTEBRAL DISK AND METHOD", and U.S. patent application Ser. No. 10/685,134, filed Oct. 14, 2003, entitled "TOOLS FOR IMPLANTING AN ARTIFICIAL VERTEBRAL DISK AND METHOD", which are all incorporated hereby by this reference.
Claims


What is claimed:

1. An intervertebral implant comprising: a first part that is adapted to mate with a first vertebra; a second part that is adapted to mate with a second vertebra; and a non-symmetrical third part that mates with the first part and the second part, with the third part having a first curved surface that mates with the first part and oriented about a first axis, and a second curved surface that mates with the second part and oriented about a second axis and with the first axis of the first curved surface provided substantially perpendicular to the second axis of the second curved surface.

2. The implant of claim 1 wherein the first part has a first socket that receives the first curved surface and the second part has a second socket that receives the second curved surface.

3. The implant of claim 2 wherein at least one of the sockets has one or more crests.

4. The implant of claim 2 wherein at least one of the sockets has one or more crests to allow for twisting motion between the first part and the second part.

5. The implant of claim 1 wherein the first part has a first keel that is adapted to be inserted in a first vertebra and the second part has a second keel that is adapted to be inserted in a second vertebra.

6. The implant of claim 5 wherein the first and second keels are about parallel to a first axis of movement of one of the first part and the second part about the third part and the first and second keels are about perpendicular to a second axis of movement of the other of the first part and the second part about the third part.

7. The implant of claim 6 wherein the first part has a first socket that receives the first curved surface and the second part has a second socket that receives the second curved surface.

8. The implant of claim 1 wherein the first curved surface allows the implant to move between anterior and posterior directions and the second curved surface allows the implant to move laterally.

9. The implant of claim 1 wherein a material of the third part is selected from the group consisting of polyetheretherketone, polyetherketoneketone, polyaryletheretherketone, polyetherketone, polyetherketoneetherketone-ketone, and polyetheretherketoneketone.

10. An intervertebral implant comprising: a first part that is adapted to mate with a first vertebra; a second part that is adapted to mate with a second vertebra; and a non-symmetrical third part that mates with the first part and the second part with the third part further comprising: a first convex surface that mates with the first part configured to limit movement of the first part between a first and second direction about a first axis; and a second convex surface that mates with the second part configured to limit movement of the second part between a third and fourth direction about a second axis, wherein the first and second axes are substantially perpendicular to one another.

11. The implant of claim 10 wherein: the first part has a first socket that receives the first convex surface and the second part has a second socket that receives the second convex surface.

12. The implant of claim 11 wherein at least one of the sockets has one or more crests.

13. The implant of claim 11 wherein at least one of the sockets has one or more crests to allow for twisting motion between the first part and the second part.

14. The implant of claim 10 wherein the first part has a first keel that is adapted to be inserted in a first vertebra and the second part has a second keel that is adapted to be inserted in a second vertebra.

15. The implant of claim 14 wherein the first and second keels are about parallel to a first axis of movement of one of the first part and the second part about the third part and the first and second keels are about perpendicular to a second axis of movement of the other of the first part and the second part about the third part.

16. The implant of claim 15 wherein: the first part has a first socket that receives the first convex surface and the second part has a second socket that receives the second convex surface.

17. The implant of claim 7 wherein the first and second directions are anterior and posterior directions and the third and fourth directions are lateral directions.

18. The implant of claim 10 wherein a material of the third part is selected from the group consisting of polyetheretherketone, polyetherketoneketone, polyaryletheretherketone, polyetherketone, polyetherketoneetherketone-ketone, and polyetheretherketoneketone.

19. An intervertebral implant comprising: a first plate adapted to mate to a first vertebral body, the first plate including a first socket having a first interior surface wherein the first interior surface has a curved shape about a first axis; a second plate adapted to mate to a second vertebral body, the second plate including a second socket opposed to the first socket, the second socket having a second interior surface, wherein the second interior surface has a curved shape about a second axis oriented substantially perpendicular to the first axis of the curved shape of the first interior surface; and a non-symmetrical spacer with a first side that fits adjacent to the curved shape of the first interior surface of the first socket and a second side that fits adjacent to the curved shape of the second interior surface of the second socket.

20. The implant of claim 19 including at least one of the first and second plates including a keel extending therefrom and adapted to engage a vertebral body.

21. The implant of claim 19 including a first keel extending from the first plate and adapted to engage a first vertebral body, and a second keel extending from the second plate and adapted to engage a second vertebral body.

22. The implant of claim 19 wherein the first plate has a first side and a second side, wherein the first side faces the second plate and the second side contacts a surface of the first vertebral body.

23. The implant of claim 22 wherein the first side of the first plate and the second side of the first plate are parallel to each other.

24. The implant of claim 22 wherein the first side of the first plate and the second side of the first plate are not parallel to each other.

25. The implant of claim 19 wherein the second plate has a first side and a second side and the first side of the second plate faces the first plate and the second side of the second plate contacts a surface of the second vertebral body.

26. The implant of claim 25 wherein the first side of the second plate and the second side of the second plate are parallel to each other.

27. The implant of claim 25 the first wherein side of the second plate and the second side of the second plate are not parallel to each other.

28. The implant of claim 19 wherein the first socket of the first plate has first and second side walls that are parallel to each other.

29. The implant of claim 19 wherein the second socket of the second plate has first and second side walls that are parallel to each other.

30. The implant of claim 19 wherein the first and second side walls of the first socket of the first plate are parallel to each other and the second socket of the second plate has first and second side walls that are parallel to each other and further wherein the first and second side walls of the first plate are substantially perpendicular to the first and second side walls of the second plate.

31. The implant of claim 19 wherein the implant is assembled so that the spacer is positioned in the first socket of the first plate and the second socket of the second plate.

32. The implant of claim 19 wherein the first side of the spacer is curved and the second side of the spacer is curved.

33. The implant of claim 32 wherein the first curved side is oriented substantially perpendicular to the second curved side.

34. The implant of claim 19 wherein the first side of the spacer is convex and the second side of the spacer is convex.

35. The implant of claim 34 wherein the convex first side is oriented perpendicular to the convex second side.

36. The implant of claim 19 wherein at least one of the sockets has one or more crests.

37. The implant of claim 19 wherein at least one of the sockets has one or more crests to allow for twisting motion between the first plate and the second plate.

38. The implant of claim 19 wherein a material of the spacer is selected from the group consisting of polyetheretherketone, polyetherketoneketone, polyaryletheretherketone, polyetherketone, polyetherketoneetherketone-ketone, and polyetheretherketoneketone.

39. An intervertebral implant comprising: a first plate adapted to mate to a first vertebral body; a second plate adapted to mate to a second vertebral body; and a non-symmetrical spacer with a first convex side about a first axis and a second convex side about a second axis wherein the first axis of the first convex side is substantially perpendicular to the second axis of the second convex side, wherein first convex side limits movement of the first plate to flexion and extension and the second convex side limits movement of the second plate to lateral bending.

40. The implant of claim 39 including at least one of the first and second plates including a keel extending therefrom and adapted to engage a vertebral body.

41. The implant of claim 39 including a first keel extending from the first plate and adapted to engage the first vertebral body, and a second keel extending from the second plate and adapted to engage the second vertebral body.

42. The implant of claim 39 wherein the first plate has a first side and a second side, wherein the first side faces the second plate and the second side contacts a surface of the first vertebral body.

43. The implant of claim 42 wherein a first socket of the first plate has first and second side walls that are substantially perpendicular to the first side of the first plate.

44. The implant of claim 43 wherein the first socket of the first plate has a curved third side between the first and second side walls.

45. The implant of claim 39 wherein a socket of the first plate has first and second side walls that are parallel to each other.

46. The implant of claim 39 wherein the second plate has a first side and a second side, wherein the first side faces the first plate and the second side contacts a surface of the second vertebral body.

47. The implant of claim 46 wherein the first side of the second plate and the second side of the second plate are parallel to each other.

48. The implant of claim 46 wherein the first side of the second plate and the second side of the second plate are not parallel to each other.

49. The implant of claim 46 wherein a socket of the second plate has first and second side walls that are substantially perpendicular to the first side of the second plate.

50. The implant of claim 39 wherein a second socket of the second plate has first and second side walls that are parallel to each other.

51. The implant of claim 39 wherein the first plate is adapted to mate to an upper vertebral body.

52. The implant of claim 51 wherein the second plate is adapted to mate to a lower vertebral body.

53. The implant of claim 39 wherein the first plate is adapted to mate to a lower vertebral body.

54. The implant of claim 53 wherein the second plate is adapted to mate to an upper vertebral body.

55. An intervertebral implant comprising: a first plate adapted to mate with a first vertebra; a second plate adapted to mate with a second vertebra; a spacer between the first and the second plates along a transverse plane; the spacer non-symmetrical about the transverse plane and having first and second curved surfaces that are at an angle to each other with the first curved surface mated with the first plate and the second curved surface mated with the second plate.

56. The implant of claim 55 wherein the curved surfaces are cylindrical.

57. The implant of claim 56 wherein the first and second plates each have a cylindrical surface that mates with a respective cylindrical surface of the spacer.

58. The implant of claim 55 wherein the curved surfaces are convex.

59. The implant of claims 58 wherein the first and second plates each have a concave surface that mates with a respective convex surface of the spacer.

60. The implant of claim 55 wherein the first and second plates each have a curved surface that mates with a respective curved surface of the spacer.

61. The implant of claim 55 wherein the first curved surface has a first axis and the second curved surface has a second axis, and the first axis and the second axis are at an angle to each other.

62. The implant of claim 55 wherein the first curved surface has a first axis and the second curved surface has a second axis, and the first axis and the second axis are at about perpendicular to each other.

63. An intervertebral implant comprising: a first plate adapted to mate with a first vertebra; a second plate adapted to mate with a second vertebra; a spacer placed between the first and the second plates; and wherein said spacer in conjunction with the first plate allows rotational motion about a first axis and blocks motion about a second axis, and the spacer in conjunction with the second plate allows rotational motion about the second axis and blocks motion about the first axis.

64. The implant of claim 63 wherein said first axis is perpendicular to the second axis.

65. The implant of claim 63 wherein the implant can rotate about a third axis that is at an angle to the first axis and to the second axis.

66. An intervertebral implant comprising: a first plate including a first curved interior surface extending between a first end and a second end of the first plate; a second plate including a second curved interior surface extending between a third end and a fourth end of the second plate, wherein the third and fourth ends are oriented substantially perpendicular to the first and second ends; and a spacer positioned between the first plate and the second plate substantially along a transverse plane, the spacer having a non-symmetrical configuration about the transverse plane, wherein the spacer includes a first convex surface in contact with the first curved interior surface and a second convex surface in contact with the second curved interior surface.

67. The implant of claim 66 including at least one of the first and second plates including a keel extending therefrom and adapted to engage a vertebral body.

68. The implant of claim 66 including a first keel extending from the first plate and adapted to engage the first vertebral body, and a second keel extending from the second plate and adapted to engage the second vertebral body.

69. The implant of claim 66 wherein the first plate has a first side and a second side, wherein the first side faces the second plate and the second side contacts a surface of the first vertebral body.

70. The implant of claim 69 wherein the first side of the first plate and the second side of the first plate are parallel to each other.

71. The implant of claim 69 wherein the first side of the first plate and the second side of the first plate are not parallel to each other.

72. The implant of claim 69 wherein the first curved interior surface of the first plate has first and second side walls that are substantially perpendicular to the second side of the first plate.

73. The implant of claim 66 wherein the first curved interior surface of the first plate has a first side wall and a second side wall, wherein the first and second side walls limit movement of the first plate in a desired direction with respect to the spacer.

74. The implant of claim 73 wherein the first and second side walls of the first plate are parallel to each other.

75. The implant of claim 74 wherein the second curved interior surface of the second plate has first and second side walls that are substantially perpendicular to the first and second side walls of the first plate.

76. The implant of claim 66 wherein the first curved interior surface of the first plate has first and second side walls that are parallel to each other and the first and second side walls of the second curved interior surface are parallel to each other and further wherein the first and second side walls of the first plate are substantially perpendicular to the first and second side walls of the second plate.

77. The implant of claim 66 wherein the second plate has a first side and a second side and the first side of the second plate faces the first plate and the second side of the second plate contacts a surface of the second vertebral body.

78. The implant of claim 77 wherein the first side of the second plate and the second side of the second plate are parallel to each other.

79. The implant of claim 77 wherein the first side of the second plate and the second side of the second plate are not parallel to each other.

80. The implant of claim 66 wherein the first convex surface of the spacer is substantially perpendicular to the second convex surface of the spacer.

81. The implant of claim 66 wherein the first convex surface is oriented to lie substantially perpendicular to the second convex surface.

82. The implant of claim 66 wherein a material of the spacer is selected from the group consisting of polyetheretherketone, polyetherketoneketone, polyaryletheretherketone, polyetherketone, polyetherketoneetherketone-ketone, and polyetheretherketoneketone.

83. An intervertebral implant comprising: a first plate adapted to mate with a first vertebra, the first plate further comprising: a first socket therein having a first concave surface; a first wall adjacent to the first concave surface; a second wall adjacent to the first concave surface; a second plate adapted to mate with a second vertebra, the second plate further comprising: a second socket therein having a second concave surface, the second socket opposed to the first socket, wherein the second concave surface is oriented substantially perpendicular to the first concave surface; a third wall adjacent to the second concave surface; a fourth wall adjacent to second concave surface, wherein the third and fourth walls are substantially perpendicular to the first and second walls; a non-symmetrical spacer having a first convex surface to be received in the first socket and a second convex surface to be received in the second socket, wherein the first socket limits movement of the first plate between a first and second direction and the second socket limits movement of the second plate between a third and fourth direction.

84. An intervertebral implant having an anterior side, a posterior side, a right lateral side and a left lateral side, the implant comprising: a non-symmetrical spacer between a first plate and a second plate, the spacer having a first convex surface oriented between the anterior side and the posterior side and mated with the first plate, the spacer having a second convex surface opposed to the first convex surface and mated with the second plate, wherein the second convex surface is oriented between the right lateral side and the left lateral side.

85. An intervertebral implant having an anterior side, a posterior side, a right lateral side and a left lateral side, the implant comprising: a spacer between a first plate and a second plate, the spacer having a first convex surface oriented such that the first plate is limited to rotating about a first axis intersecting the right and left lateral sides, the spacer further having a second convex surface opposed to the first convex surface oriented such that the second plate is limited to rotating about a second axis intersecting the anterior and posterior sides.

86. An intervertebral implant comprising: a first part that is adapted to mate with a first vertebral body; a second part that is adapted to mate with a second vertebral body; and a third part that mates with the first part and the second part, with the third part having a first curved surface adapted to mate with the first part and provided about a first axis, the first curved surface to allow the implant to move substantially between anterior and posterior directions and a second curved surface adapted to mate with the second part and provided about a second axis, the second curved surface to allow the implant to move substantially laterally, wherein the first axis and the second axis are oriented at an angle with respect to one another.

87. The implant of claim 86 wherein the first part and the second part are rotatable about a third axis substantially perpendicular to the first and second axes.

88. The implant of claim 86 wherein the first axis is substantially perpendicular to the second axis.

89. An intervertebral implant comprising: a first part that is adapted to mate with a first vertebra; a second part that is adapted to mate with a second vertebra; and an non-symmetrical third part that mates with the first part and the second part with the third part further comprising: a first surface that mates with the first part configured to limit movement of the first part between a posterior and anterior direction; and a second convex surface that mates with the second part configured to limit movement of the second part between lateral directions.
Description


FIELD OF THE INVENTION

This invention relates to an artificial vertebral disk replacement and method.

BACKGROUND OF THE INVENTION

The spinal column is a biomechanical structure composed primarily of ligaments, muscles, vertebrae and intervertebral disks. The biomechanical functions of the spine include: (1) support of the body, which involves the transfer of the weight and the bending movements of the head, trunk and arms to the pelvis and legs, (2) complex physiological motion between these parts, and (3) protection of the spinal cord and nerve roots.

As the present society ages, it is anticipated that there will be an increase in adverse spinal conditions which are characteristic of older people. Pain associated with such conditions can be relieved by medication and/or surgery. Of course, it is desirable to eliminate the need for major surgery for all individuals, and, in particular, for the elderly.

More particularly, over the years, a variety of intervertebral implants have been developed in an effort to relieve the pain associated with degenerative and dysfunctional disk conditions. For example, U.S. Pat. No. 4,349,921 to Kuntz discloses an intervertebral disk prosthesis.

U.S. Pat. No. 4,714,469 to Kenna discloses a spinal implant that fuses vertebrae to the implant. The implant has a rigid body that fits between the vertebra with a protuberance extending from a vertebral contacting surface and extends into the vertebral body.

U.S. Pat. No. 5,258,031 to Salib et al. discloses another prosthetic disk with a ball that fits into a socket.

U.S. Pat. Nos. 5,425,773 and 5,562,738 are related patents to Boyd et al. that disclose a disk arthroplasty device for replacement of the spinal disk. A ball-and-socket are provided to enable rotation.

U.S. Pat. No. 5,534,029 to Shima discloses an articulated vertebral body spacer with a pair of upper and lower joint pieces inserted between the vertebra. An intermediate layer is provided to allow for movement between the upper joint piece and the lower joint piece.

U.S. Pat. No. 5,782,832 to Larsen et al. discloses a two-piece ball-and-socket spinal implant with upper and lower plates for insertion within the intervertebral space.

U.S. Pat. No. 6,156,067 to Bryan et al. discloses a prosthesis having two plates with a nucleus there between.

None of these solutions provide an implant that restores a wide range of natural movement.

Accordingly, there needs to be developed implants for alleviating such conditions, and for restoring natural movement.

SUMMARY OF THE INVENTION

An embodiment of the present invention is directed to providing an implant for alleviating discomfort associated with the spinal column. The implant is characterized by having a first plate and a second plate with a spacer therebetween. The spacer fits within cavities on each of the first and second plate.

Other aspects, objects, features and elements of embodiments of the invention are described or are evident from the accompanying specification, claims and figures.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a side perspective view of an embodiment of the assembled implant of the invention. FIG. 1B is an alternative side perspective view of an embodiment of the assembled implant of the invention.

FIG. 2A and FIG. 2B show perspective views of the facing surfaces of the first plate and the second plate of an embodiment of the implant of the invention. FIG. 2C through FIG. 2F show cross-sectional views of the first plate and the second plate of an embodiment of the implant of the invention.

FIG. 3A is a perspective view of the spacer of an embodiment of the implant of the invention. FIG. 3B and FIG. 3C are cross-sections of the spacer of an embodiment of the implant of the invention taken at 90.degree. angles respective to each other.

FIG. 4A is a cross-section of an embodiment of the implant of the invention taken along a plane parallel to the sagittal plane. FIG. 4B is a cross-section of an embodiment of the implant of the invention corresponding to a plane parallel to the location of the coronal plane after the implant has been implanted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION

The following description is presented to enable any person skilled in the art to make and use the invention. Various modifications to the embodiments described will be readily apparent to those skilled in the art, and the principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of the present invention as defined by the appended claims. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein. To the extent necessary to achieve a complete understanding of the invention disclosed, the specification and drawings of all patents and patent applications cited in this application are incorporated herein by reference

FIG. 1A shows an embodiment of the implant 100 of the invention. The implant 100 has a first part 110 that is configured to mate with a first vertebra and a second part 120 that is configured to mate with a second vertebra. The first part 110 is a first or upper plate and the second part 120 is a second or lower plate. A third part 130 sits between the first part 110 and the second part 120. The third part 130 acts as a spacer between the first part 110 and the second part 120 and facilitates pivotal movement of the first plate 110 and second plate 120, relative to each other.

The upper plate 110 has a first surface 112 from which a keel 114 extends. The first surface 112, or upper surface, abuts the vertebral body when the implant 100 is implanted. The first keel 114 extends into the vertebral body to anchor the implant into position. The keel 114 includes teeth 115 that assist in keeping the keel in position once the implant 100 is positioned between vertebral bodies. Generally, in a preferred embodiment that is to be implanted by an anterior approach, the teeth 115 point anteriorly in order to prevent the implant 100 from moving in an anterior direction. The second surface 116, or lower surface, engages the third part 130 of the implant and faces the second plate 120. The second surface 116 can form a planar surface that is parallel to the first surface 112, or can form a planar surface that is unparallel to the first surface 112 in order, in one embodiment, to allow the first plate 110 and the second plate 120 to be able to pivot to a greater degree with respect to each other. It is to be understood that other factors such as the height of the spacer 130 can also be adjusted in order to increase the degree that the first plate 110 and the second plate 120 can pivot relative to each other.

When the implant is implanted between vertebral bodies the planar surfaces corresponding to the first surface 112 and the second surface 116 of the first plate 110 lie within, or substantially within, the axial plane of the body while the first keel 114 (which is at or near a 90.degree. angle from the surfaces 112, 116) is aligned within the sagittal plane of the body.

The lower plate 120 has a first surface 122 from which a keel 124 extends. The first surface 122, or lower surface, abuts the vertebral body when the implant 100 is implanted. The second keel 124 extends into the vertebral body to anchor the implant into position. The keel 124 includes teeth 125 that assist in keeping the keel in position once the implant 100 is positioned between vertebral bodies. Generally, in a preferred embodiment that is to be implanted by an anterior approach, the teeth 125 point anteriorly in order to prevent the implant 100 from moving in an anterior direction. The second surface 126, or upper surface, engages the third part 130 of the implant and faces the first plate 110. The second surface 126 can form a planar surface that is parallel to the first surface 122, or can form a planar surface that is not parallel to the first surface in order, in one embodiment, to allow the first plate 110 and the second plate 120 to be able to pivot or rotate to a greater degree with respect to each other. The first surface 112 of the first plate 110 can form a planar surface that is parallel to a planar surface formed by the first surface 122 of the second plate 120 when the implant 100 is assembled and is in a neutral position (i.e., the position where the first plate 110 has not rotated relative to the second plate 120). Alternatively, the first surface 112 of the first plate 110 can form a planar surface that is not parallel to the planar surface of the first surface 122 of the second plate 120 when the implant 100 is assembled and in a neutral position in order to accommodate the geometry of adjacent end plates of adjacent vertebral bodies. Such non-parallel surface in certain situations could eliminate a need to modify the surface of the end plates in order to accommodate the implant 100.

As with the first plate, when the implant is implanted between vertebral bodies the planar surfaces corresponding to the first surface 122 and the second surface 126 of the second plate 120 lie within, or substantially within, the axial plane of the body while the second keel 124 (which is at or near a 90.degree. angle from the surfaces 122, 126) is aligned within the sagittal plane of the body.

FIG. 1B shows an alternative perspective view of the implant 100 of the invention shown in FIG. 1A. Again, the implant 100 has a first part 110 that is configured to mate with a first vertebra and a second part 120 that is configured to mate with a second vertebra. The third part 130 acts as a spacer to separate the first part 110 from the second part 120 and to allow the first plate 110 and the second plate 120 to pivot or rotate relative to each other.

FIG. 2A shows a perspective view of the top plate 110 of the implant 100 of the invention. The first surface 112 of the top plate 110 is configured to contact the vertebral body when the implant 100 is implanted. The first surface 112 has a first keel 114 extending therefrom (shown in FIGS. 1A and 1B). The second surface 116 of the top plate 110 has a cavity 210 or socket formed thereon. The cavity is a convex cylindrical surface. An example of the relative dimensions of the cavity 210, are discussed with respect to FIG. 2C and FIG. 2D below. The cavity 210 includes the shallow convex surface 211 with ends 213 and 215 that are, in this particular embodiment, substantially perpendicular to the surface 116. These ends 213 and 215 essentially form perpendicular ends of a cylindrical void of cavity 210 defined by the convex surface 211 and the ends 213 and 215. As will be described later with respect to the spacer 130, the cavity 210 allows the spacer 130 to pivot or rotate about a first axis 217 that is about perpendicular to the ends 213 and 215 or in other words about an axis for the cylindrical void defined by cavity 210. The ends 213 and 215 block motion of the spacer 130 about a second axis 219 that is perpendicular to the first axis 217. In this embodiment, it is noted that the second axis 219 is parallel to the keels 114 and 124. As can be seen in FIG. 2A, the cavity 210 in this preferred embodiment includes side walls or ends 213 and 215 that have crests 233 and 235 respectively that project into the cavity 210. Additionally, the convex surface 211 has edges 234 and 236 with crests 237 and 239. The crests 233, 235, 237, and 239 allow a loose fit between the spacer 130 and the cavity 210. This loose fit in turn allows the implant to twist in a direction that is perpendicular to the flat plain of the first plate 110 about an axis that is about parallel to the axis of the spine. Thus, the implant 100 allows the spine to have movement in three orthogonal degrees of freedom, namely (1) forward and backward bending movement, (2) lateral side-to-side bending, and (3) twisting movement. It is to be understood that the cavity 240 in the lower plate 120 can also have the same design as the cavity 210 in the upper plate 110 with an increase in the amount of twisting movement afforded by the implant 110. As is noted elsewhere herein, loose fit generally between one or both of the cavities 210 and 240 and the spacer 130 can allow for twisting motion. Further the spacer 130 can also be made with crests on the curved surfaces and on the ends in order to afford similar twisting motion.

FIG. 2B shows a perspective view of the bottom plate 120 of the implant 100 of the invention. The first surface 122 of the bottom plate 120 is configured to contact the vertebral body when the implant 100 is implanted. As indicated above, the first surface 122 has a second keel 124 extending therefrom. The second surface 126 of the top plate 120 has a cavity 240 or socket formed thereon. The cavity 240 is a convex cylindrical surface. An example of the relative dimensions of the cavity 240 are discussed in more detail with respect to FIG. 2E and FIG. 2F below. The cavity 240 includes the shallow convex surface 241 with ends 243 and 245 that are in this particular embodiment substantially perpendicular to the surface 126. These ends 243 and 245 essentially form perpendicular ends of a cylindrical void of cavity 241 defined by the convex surface 241 and the ends 243 and 245. As will be described later with respect to the spacer 130, the cavity 240 allows the spacer 130 to pivot or rotate about a first axis 247 that is about perpendicular to the ends 243 and 245 or, in other words, about an axis for the cylindrical void defined by cavity 240. The ends 243 and 245 block motion of th