Intervertebral Disc

• US 20090177284A1
• Filed: 02/27/2009
• Published: 07/09/2009
• Est. Priority Date: 06/27/2002
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Inventors: Rogers, Christopher, Fatyol, Patrick, Lionetto, Mark, Dooris, Andrew, Hawkins, J. Riley, Naughton, Ronald J.
• Granted Patent: US 9,993,349 B2
• Time in Patent Office: Days
• US Class Current: 623/17.150
• CPC Class Codes: A61F 2/08 Muscles; Tendons; Ligaments sutures A61B17/04
• CPC Class Codes: A61F 2/30724 Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• 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 2/4425 made of articulated components
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/2817 Bone stimulation by chemical reactions or by osteogenic or biological products for enhancing ossification, e.g. by bone morphogenetic or morphogenic proteins [BMP] or by transforming growth factors [TGF]
• 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 2002/30092 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2002/302 toroidal, e.g. rings
• CPC Class Codes: A61F 2002/30224 cylindrical
• CPC Class Codes: A61F 2002/30232 Half-cylinders
• CPC Class Codes: A61F 2002/30245 Partial spheres
• CPC Class Codes: A61F 2002/30253 ellipsoidal or ovoid
• CPC Class Codes: A61F 2002/30327 differing in diameter
• CPC Class Codes: A61F 2002/30369 Limited lateral translation of the protrusion within a larger recess
• CPC Class Codes: A61F 2002/30383 made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
• CPC Class Codes: A61F 2002/30387 Dovetail connection
• CPC Class Codes: A61F 2002/304 with additional means for limiting said sliding
• CPC Class Codes: A61F 2002/30433 : using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30462 : retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2002/30481 : using a locking clip
• CPC Class Codes: A61F 2002/30495 : using a locking ring
• CPC Class Codes: A61F 2002/305 : Snap connection
• CPC Class Codes: A61F 2002/30515 : using a locking wedge or block
• CPC Class Codes: A61F 2002/30528 : Means for limiting said movement
• CPC Class Codes: A61F 2002/30563 : having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
• CPC Class Codes: A61F 2002/30565 : having spring elements
• CPC Class Codes: A61F 2002/30566 : Helical springs
• CPC Class Codes: A61F 2002/30578 : having apertures, e.g. for receiving fixation screws
• CPC Class Codes: A61F 2002/30604 : modular
• CPC Class Codes: A61F 2002/30649 : Ball-and-socket joints
• CPC Class Codes: A61F 2002/30662 : with rotation-limiting means
• CPC Class Codes: A61F 2002/30733 : Inserts placed into an endoprosthetic cavity, e.g. for modifying a material property
• CPC Class Codes: A61F 2002/3082 : Grooves
• CPC Class Codes: A61F 2002/30838 : Microstructures
• 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 2002/30878 : with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30883 : dovetail-shaped
• CPC Class Codes: A61F 2002/30892 : parallel
• CPC Class Codes: A61F 2002/30939 : Means for modifying the geometry of articulating surfaces, e.g. for compensating excessive clearance caused by wear
• CPC Class Codes: A61F 2002/443 : having two transversal endplates and at least one intermediate component
• CPC Class Codes: A61F 2210/0004 : bioabsorbable
• CPC Class Codes: A61F 2210/0014 : using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• 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 2220/0075 : sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2230/0065 : toroidal, e.g. ring-shaped, doughnut-shaped
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: A61F 2230/0071 : spherical
• CPC Class Codes: A61F 2230/0076 : ellipsoidal or ovoid
• CPC Class Codes: A61F 2250/0039 : differing in diameter
• CPC Class Codes: A61F 2250/0098 : radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2310/00017 : Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00029 : Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61F 2310/00203 : containing alumina or aluminium oxide
• CPC Class Codes: A61F 2310/00239 : containing zirconia or zirconium oxide ZrO2
• CPC Class Codes: A61F 2310/0058 : Coating made of diamond or of diamond-like carbon DLC
• CPC Class Codes: A61F 2310/00796 : Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

Abstract

This invention relates to an intervertebral motion disc having two motion surfaces and. wherein the radius of the upper articulation surface of the core member is greater than the radius of the lower articulation surface of the core member, and wherein the first articulation surface of the core member is spherical and the second articulation surface of the core member is curved and non-spherical.

Claims

1. An intervertebral motion disc comprising:

a) an upper prosthetic vertebral endplate comprising;

i) an outer surface adapted to mate with an upper vertebral body,

ii) an inner surface having a first articulation surface,

b) a lower prosthetic vertebral endplate comprising;

i) an outer surface adapted to mate with a lower vertebral body, and

ii) an inner surface having a first articulation surface,

c) a core member comprising;

i) an upper articulation surface adapted for articulation with the first articulation surface of the upper endplate and having a radius, and

ii) a lower articulation surface adapted for articulation with the first articulation surface of the lower endplate and having a radius,

wherein the core member is disposed between the endplates and oriented therein to produce an upper articulation interface between the first articulation surface of the upper endplate and the upper articulation surface of the core member, and a lower articulation interface between the first articulation surface of the lower endplate and the lower articulation surface of the core member,

wherein the radius of the upper articulation surface of the core member is greater than the radius of the lower articulation surface of the core member.

2. The disc of claim 1 wherein the upper articulation interface forms a curved, non-spherical interface, and the lower articulation interface forms a spherical interface.

3. The disc of claim 2 wherein the upper articulation interface forms a cylindrical interface.

4. The disc of claim 1 wherein at least one interface is a conforming interface.

5. The disc of claim 1 wherein each interface is a conforming interface.

6. The disc of claim 1 wherein the upper articulation surface of the core member is convex, and the lower articulation surface of the core member is concave.

7. The disc of claim 1 wherein the upper articulation surface of the core member is concave, and the lower articulation surface of the core member is convex.

8. The disc of claim 1 wherein the radius of the upper articulation surface of the core member is at least 10 times greater than the radius of the lower articulation surface of the core member.

9. The disc of claim 1 wherein the radius of the upper articulation surface of the core member is between about 40 mm and about 100 mm, and the radius of the lower articulation surface of the core member is between about 10 mm and about 30 mm.

10. The disc of claim 1 wherein the radius of the upper articulation surface of the core member is between about 40 mm and about 80 mm

11. The disc of claim 1 wherein the radius of the upper articulation surface of the core member is at least 2 times greater than the radius of lower articulation surface.

12. An intervertebral motion disc comprising:

a) a first prosthetic vertebral endplate comprising;

i) an outer surface adapted to mate with a first vertebral body,

ii) an inner surface having a first articulation surface,

b) a second prosthetic vertebral endplate comprising;

i) an outer surface adapted to mate with a second vertebral body, and

ii) an inner surface having a first articulation surface,

c) a core member comprising;

i) a first articulation surface adapted for articulation with the first articulation surface of the first endplate, and

ii) a second articulation surface adapted for articulation with the first articulation surface of the second endplate,

wherein the core member is disposed between the endplates and oriented therein to produce a first articulation interface between the first articulation surface of the first endplate and the first articulation surface of the core member, and a second articulation interface between the first articulation surface of the second endplate and the second articulation surface of the core member,

wherein the first articulation surface of the core member is spherical and the second articulation surface of the core member is curved and non-spherical.

13. The disc of claim 12 wherein the second articulation surface of the core member is cylindrical.

14. The disc of claim 12 wherein at least one interface is a conforming interface.

15. The disc of claim 12 wherein each interface is a conforming interface.

16. The disc of claim 12 wherein the first articulation surface of the core member is convex, and the second articulation surface of the core member is concave.

17. The disc of claim 12 wherein the first articulation surface of the core member is concave, and the second articulation surface of the core member is convex.

18. The disc of claim 12 wherein the first articulation surface of the core member is convex, and the second articulation surface of the core member is convex.

19. The disc of claim 12 wherein the first articulation surface of the core member is concave, and the second articulation surface of the core member is concave.

20. The disc of claim 12 wherein the radius of the first articulation surface of the core member is at least 3 times greater than the radius of the lower articulation surface of the core member.