Artificial intervertebral disk prosthesis

• US 5,683,465 A
• Filed: 03/18/1996
• Issued: 11/04/1997
• Est. Priority Date: 03/18/1996
• Status: Expired due to Fees

• Current Assignee: Gary Lee Shinn, James Daryl Tate
• Original Assignee: Gary Lee Shinn, James Daryl Tate
• Inventors: Shinn, Gary Lee, Tate, James Daryl
• Primary Examiner(s): Isabella, David
• Assistant Examiner(s): Black, John M.
• Application Number:
  US08/617,217
• Time in Patent Office: 596 Days
• Field of Search: 623/17, 606/61
• US Class Current: 623/17.14
• CPC Class Codes: A61B 17/68 Internal fixation devices , including fasteners and spinal fixators, even if a part thereof projects from the skin bone staples A61B17/0642
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61F 2/2846 Support means for bone substitute or for bone graft implants, e.g. membranes or plates for covering bone defects nets or sleeves applied to surface of endoprostheses A61F2/30907; bone plates A61B17/80; bone regeneration in dental surgery A61C8/0006
• CPC Class Codes: A61F 2/30742 Bellows or hose-like seals; Sealing membranes A61B17/8808 takes precedence; sealing membranes for retaining bone substitute A61F2/2846
• CPC Class Codes: A61F 2/4425 made of articulated components
• CPC Class Codes: A61F 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/30069 elastomeric
• CPC Class Codes: A61F 2002/30187 D-shaped or half-disc-shaped
• CPC Class Codes: A61F 2002/302 toroidal, e.g. rings
• CPC Class Codes: A61F 2002/30225 Flat cylinders, i.e. discs
• CPC Class Codes: A61F 2002/30237 partial tubes
• CPC Class Codes: A61F 2002/30448 using adhesives
• CPC Class Codes: A61F 2002/305 Snap connection
• 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 2002/30578 having apertures, e.g. for receiving fixation screws
• CPC Class Codes: A61F 2002/30594 slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30662 with rotation-limiting means
• CPC Class Codes: A61F 2002/30677 Means for introducing or releasing pharmaceutical products, e.g. antibiotics, into the body
• CPC Class Codes: A61F 2002/30733 Inserts placed into an endoprosthetic cavity, e.g. for modifying a material property
• CPC Class Codes: A61F 2002/30772 : Apertures or holes, e.g. of circular cross section
• CPC Class Codes: A61F 2002/3079 : Stepped or enlarged apertures, e.g. having discrete diameter changes
• CPC Class Codes: A61F 2002/30841 : Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30892 : parallel
• CPC Class Codes: A61F 2002/30901 : longitudinally
• 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 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/005 : using adhesives
• CPC Class Codes: A61F 2230/0034 : D-shaped
• CPC Class Codes: A61F 2230/0065 : toroidal, e.g. ring-shaped, doughnut-shaped
• CPC Class Codes: A61F 2230/0069 : cylindrical
• 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 2310/00047 : Aluminium or Al-based alloys

Abstract

A prosthesis for the replacement of a spinal disk includes a first disk half and a second disk half. The first disk half includes a portion of a socket attached to a first plate. The second disk half includes a portion of a ball attached to a second plate. The socket includes a plurality of expansion slots which expand to allow the portion of a ball to be inserted into the socket and which then contract to retain the portion of a ball therein. A first hole is provided through the first plate, a second hole is provided through the socket, and a third hole is provided through the second plate which together form an opening through the disk. The opening is adapted to receive an insert to either medicate a pair of vertebrae or provide a barrier therein. The disk is fastened to the vertebrae by any preferred combination of pins, tabs, or a first annulus or second annulus, each of which extend from the disk. The tabs or the first annulus or the second annulus includes a hole therein that is adapted to receive a screw. A flexible substantially toroidal enclosure is attached to the perimeter of the first plate and to the perimeter of the second plate when desired to form a barrier between the disk and any proximal organic material.

Claims

1. An artificial intervertebral disk prosthesis, comprising:

(a) a first disk half assembly, said first disk half assembly including a first disk plate having a first side and a second side and having a substantially "D-shaped" contour thereof, and including a socket having a first socket end and an opposite second socket end, said first socket end is attached to said first side of said first disk plate;

(b) a second disk half assembly, said second disk half assembly including a second disk plate having a first side and a second side, said second disk plate having a contour substantially the same as said first disk plate, and including a portion of a ball having a first ball portion end and an opposite second ball portion end, said first ball portion end is attached to said first side of said second disk plate, said portion of a ball configured for cooperation with said socket;

(c) means for inserting and for retaining said portion of a ball in said socket, said means for inserting and for retaining is attached to said first disk half assembly, said means for retaining providing a sufficient resistance to an applied force to prevent separation of said first disk half assembly from said second disk half assembly;

(d) means for retaining said disk prosthesis in a position of cooperation with at least one vertebra, said means for retaining is attached to said second side of at least one of said first and second disk plates; and

(e) means for receiving at least one bioabsorbable insert, said means for receiving is formed in any of said first and second disk plates and said portion of ball.

2. The disk of claim 1 wherein said means for inserting and for retaining said ball into said socket includes a plurality of expansion slots found in said socket at said second socket end and extending a predetermined distance toward said first socket end.

3. The disk of claim 1 including means attached to said first side of said first disk plate for limiting the amount of tilt of said first disk half assembly with respect to said second disk half assembly.

4. The disk of claim 3 wherein said means for limiting tilt includes extending said socket second end a predetermined distance from said first side of said first plate sufficient to impinge upon a portion of said second disk plate when said first disk half assembly is tilted with respect to said second disk half assembly.

5. The disk of claim 3 wherein said means for limiting tilt includes providing a beveled edge on said socket second end.

6. The disk of claim 1 including means attached to said first disk plate and said second disk plate for enclosing said disk prosthesis.

7. The disk of claim 6 wherein said means for enclosing includes a flexible substantially toroidal shaped enclosure that is disposed around a perimeter of said first disk plate and is attached to said first disk plate and is disposed around a perimeter of said second disk plate and is attached to said second disk plate.

8. The disk of claim 1 wherein said means for retaining said disk prosthesis in a position of cooperation includes means for attaching said disk to said at least one vertebra.

9. The disk of claim 8 wherein said means for attaching includes at least one protrusion attached to said first disk plate and extending from said second side of said first disk plate, said at least one protrusion adapted for cooperation with said at least one vertebra.

10. The disk of claim 8 wherein said means for attaching includes at least one protrusion attached to said second disk plate and extending from said second side of said second disk plate, said at least one protrusion adapted for cooperation with said at least one vertebra.

11. The disk of claim 8 wherein said means for attaching includes at least one tab attached to said first disk plate and extending from said second side of said first disk plate, said at least one tab including at least one hole therein.

12. The disk of claim 8 wherein said means for attaching includes at least one tab attached to said second disk plate and extending from said second side of said second disk plate, said at least one tab including at least one hole therein.

13. The disk of claim 8 wherein said means for attaching includes an annular ring attached to said first disk plate, said annular ring extending away from said second side of said first disk plate and including at least one hole therein.

14. The disk of claim 8 wherein said means for attaching includes an annular ring attached to said second disk plate, said annular ring extending away from said second side of said second disk plate and including at least one hole therein.

15. The disk of claim 1 wherein said disk includes a second bioabsorbable insert that forms a filter.

16. The disk of claim 1 wherein said disk includes a second bioabsorbable insert that forms a membrane.

17. The disk of claim 1 wherein said at least one bioabsorbable insert includes a second insert that forms a barrier which affects the passage of said at least one bioabsorbable insert into a tissue of a living organism.

18. The disk of claim 1 wherein said at least one bioabsorbable insert includes a bioabsorbable substance that is dissolved over a period of time when said disk prosthesis is placed within a living organism.

19. The disk of claim 18 wherein said bioabsorbable substance is absorbed by a tissue of a living organism over a period of time when said disk prosthesis is placed within said living organism.

20. The disk of claim 1 wherein said socket defines a portion of a sphere.

21. The disk of claim 1 wherein said portion of a ball defines a portion of a sphere.

22. An artificial intervertebral disk prosthesis, comprising:

(a) a first disk half assembly, said first disk half assembly including a first disk plate having a first side and a second side and having a substantially "D-shaped" contour thereof, and including a socket having a first socket end and an opposite second socket end, said first socket end is attached to said first side of said first disk plate;

(b) a second disk half assembly, said second disk half assembly. including a second disk plate having a first side and a second side, said second disk plate having a contour substantially the same as said first disk plate, and including a portion of a ball having a first ball portion end and an opposite second ball portion end, said first ball portion end is attached to said first side of said second disk plate, said portion of a ball configured for cooperation with said socket;

(c) means for inserting and for retaining said portion of a ball in said socket, said means for inserting and for retaining attached to said first disk half assembly;

(d) means for retaining said disk prosthesis in a position of cooperation with at least one vertebra, said means for retaining attached to said artificial intervertebral disk prosthesis; and

(e) means for receiving at least one bioabsorbable insert therein, said means for receiving attached to said artificial intervertebral disk prosthesis including a first hole through said first plate, a second hole through said said socket, and a third hole through said second plate, said first hole, said second hole, and said third hole defining an opening through said disk prosthesis.

23. The disk of claim 22 wherein said bioabsorbable insert includes a substance that is therapeutically effective.

24. An artificial intervertebral disk prosthesis, comprising:

(a) a first disk half assembly, said first disk half assembly including a first disk plate having a first side and a second side and having a substantially "D-shaped" contour thereof, and including a socket having a first socket end and an opposite second socket end, said first socket end is attached to said first side of said first disk plate;

(b) a second disk half assembly, said second disk half assembly including a second disk plate having a first side and a second side, said second disk plate having a contour substantially the same as said first disk plate, and including a portion of a ball having a first ball portion end and an opposite second ball portion end, said first ball portion end is attached to said first side of said second disk plate, said portion of a ball configured for cooperation with said socket;

(c) means for inserting and for retaining said portion of a ball in said socket, said means for inserting and for retaining attached to said first disk half assembly;

(d) means for retaining said disk prosthesis in a position of cooperation with at least one vertebra, said means for retaining attached to said artificial intervertebral disk prosthesis; and

(e) means for receiving at least one filter, said means for receiving attached to said intervertebral disk prosthesis.