INTERVERTEBRAL IMPLANT

• US 20160193057A1
• Filed: 01/04/2016
• Published: 07/07/2016
• Est. Priority Date: 12/19/2002
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Inventors: Rhoda, William S.
• Granted Patent: US 9,554,919 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/30744 End caps, e.g. for closing an endoprosthetic cavity
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• CPC Class Codes: A61F 2/4465 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2002/30133 kidney-shaped or bean-shaped
• CPC Class Codes: A61F 2002/3023 wedge-shaped cylinders
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30599 stackable
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30772 Apertures or holes, e.g. of circular cross section
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30843 Pyramidally-shaped
• CPC Class Codes: A61F 2002/4629 connected to the endoprosthesis or implant via a threaded connection
• CPC Class Codes: A61F 2210/0004 bioabsorbable
• CPC Class Codes: A61F 2220/0033 : made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2220/0041 : using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2230/0015 : Kidney-shaped, e.g. bean-shaped
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: A61F 2250/0063 : Nested prosthetic parts
• CPC Class Codes: A61F 2250/0098 : radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys

Abstract

An vertebral implant for fusing adjacent vertebrae or for replacing vertebral bodies is disclosed. The implant is a biocompatible metal, resorbable, or radiolucent implant conforming substantially in size and shape with an end plate of a vertebra. The implant preferably has a wedge-shaped profile to restore disc height and the natural curvature of the spine. The top and bottom surfaces of the implant have areas with a plurality of teeth to resist expulsion and provide initial stability and areas devoid of any protrusions to receive implantation instrumentation. The implant also has a stackability feature. The implant provides initial stability needed for fusion without stress shielding.

Claims

1-39. -39. (canceled)

40. An intervertebral implant, comprising:

a body having a convexly curved anterior side substantially opposing a posterior side spaced apart by first and second convexly curved lateral sides;

top and bottom surfaces defining two central bores extending from each surface through to the other, wherein each of the top and bottom surfaces are configured to contact an endplate of adjacent vertebrae, and wherein each of the top and bottom surfaces have a plurality of gripping structures for engaging the endplates of the adjacent vertebrae and have a substantially smooth area; and

an instrument bore formed in the anterior side of the body at a center of the anterior side of the body, the instrument bore being configured to receive an inserter instrument;

wherein the substantially smooth area of the top surface extends in an anterior-posterior direction from a first perimeter edge where the top surface intersects with the anterior surface of the implant to a second perimeter edge where the top surface intersects with the posterior surface of the implant; and

wherein the substantially smooth area of the bottom surface extends in an anterior-posterior direction from a first perimeter edge where the bottom surface intersects with the anterior surface of the implant to a second perimeter edge where the bottom surface intersects with the posterior surface of the implant.

41. The implant of claim 40, wherein the instrument bore extends into a portion of the body that divides the two central bores.

42. The implant of claim 40, further comprising a second instrument bore formed in one of the lateral sides of the body, the second instrument bore being configured to receive an inserter instrument.

43. The implant of claim 40, wherein the instrument bore is threaded.

44. The implant of claim 40, wherein the top and bottom surfaces of the implant are substantially flat planar surfaces having a downward taper at an anterior end of the implant and at a posterior end of the implant to facilitate insertion of the implant.

45. The implant of claim 40, wherein the top surface and the bottom surface of the implant define a height dimension h₁ at the posterior side and a height dimension h₂ at the anterior side, wherein h₂ is larger than h₁.

46. The implant of claim 45, wherein the top surface and the bottom surface of the implant define a height dimension h₃ at an intermediate point between the anterior side and the posterior side, h₃ being larger than h₂.

47. The implant of claim 40, wherein the substantially smooth areas are recessed.

48. The implant of claim 40, wherein the plurality of gripping structures sit proud of the substantially smooth areas.

49. An intervertebral implant assembly, comprising:

an implant, comprising;

a body having a convexly curved anterior side substantially opposing a posterior side spaced apart by first and second convexly curved lateral sides;

top and bottom surfaces defining two central bores extending from each surface through to the other, wherein each of the top and bottom surfaces are configured to contact an endplate of adjacent vertebrae, and wherein each of the top and bottom surfaces have a plurality of gripping structures for engaging the endplates of the adjacent vertebrae and have a substantially smooth area; and

an instrument bore formed in the anterior side of the body at a center of the anterior side of the body, the instrument bore being configured to receive an inserter instrument;

wherein the substantially smooth area of the top surface extends in an anterior-posterior direction from a first perimeter edge where the top surface intersects with the anterior surface of the implant to a second perimeter edge where the top surface intersects with the posterior surface of the implant; and

wherein the substantially smooth area of the bottom surface extends in an anterior-posterior direction from a first perimeter edge where the bottom surface intersects with the anterior surface of the implant to a second perimeter edge where the bottom surface intersects with the posterior surface of the implant; and

a surgical instrument received by the substantially smooth areas.

50. The implant assembly of claim 49, wherein the surgical instrument is a distractor.

51. The implant assembly of claim 49, further comprising an inserter instrument received in the instrument bore.

52. The implant assembly of claim 49, wherein the instrument bore extends into a portion of the body that divides the two central bores.

53. The implant assembly of claim 49, further comprising a second instrument bore formed in one of the lateral sides of the body, the second instrument bore being configured to receive an inserter instrument.

54. The implant assembly of claim 49, wherein the instrument bore is threaded.

55. The implant assembly of claim 49, wherein the top and bottom surfaces of the implant are substantially flat planar surfaces having a downward taper at an anterior end of the implant and at a posterior end of the implant to facilitate insertion of the implant.

56. The implant assembly of claim 49, wherein the top surface and the bottom surface of the implant define a height dimension h₁ at the posterior side and a height dimension h₂ at the anterior side, wherein h₂ is larger than h₁.

57. The implant assembly of claim 56, wherein the top surface and the bottom surface of the implant define a height dimension h₃ at an intermediate point between the anterior side and the posterior side, h₃ being larger than h₂.

58. The implant assembly of claim 49, wherein the substantially smooth areas are recessed.

59. The implant assembly of claim 49, wherein the plurality of gripping structures sit proud of the substantially smooth areas.