Artificial intervertebral disc

• US 4,309,777 A
• Filed: 11/13/1980
• Issued: 01/12/1982
• Est. Priority Date: 11/13/1980
• Status: Expired due to Term

• Current Assignee: Arun A. Patil
• Original Assignee: Arun A. Patil
• Inventors: Patil, Arun A.
• Primary Examiner(s): FRINKS, RONALD
• Application Number:
  US06/206,564
• Time in Patent Office: 425 Days
• Field of Search: 3/1.91, 3/1.9, 3/1, 128/92 C, 128/92 R, 128/92 G, 128/334 R
• US Class Current: 623/17.13
• 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 2002/30113 circular
• CPC Class Codes: A61F 2002/30225 Flat cylinders, i.e. discs
• CPC Class Codes: A61F 2002/30354 Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
• CPC Class Codes: A61F 2002/3037 Translation along the common longitudinal axis, e.g. piston
• CPC Class Codes: A61F 2002/30462 retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2002/30568 Multiple spring systems including two or more helical springs
• 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 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• 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 2230/0006 circular
• 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: Y10S 606/907 Composed of particular material or coated

Abstract

An artificial intervertebral disc for implantation in the disc space after the removal of a diseased or damaged cervical intervertebral is described and comprises upper and lower disc portions having a plurality of springs positioned therebetween to yieldably urge the disc portions away from each other. A plurality of spikes extend upwardly from the upper disc portion for engagement with the vertebra thereabove. A plurality of spikes extend downwardly from the lower end of the lower disc portion for engagement with the vertebra therebelow.

Claims

1. An artificial intervertebral disc for implantations in the disc space after the removal of a diseased or damaged cervical intervertebral disc, comprising,

an upper disc portion,

a lower disc portion mounted on said upper disc portion,

said upper disc portion having spike means extending upwardly from the upper end thereof for engagement with the vertebra thereabove,

said lower disc portion having spike means extending downwardly from the lower end thereof for engagement with the vertebra therebelow,

and spring means positioned between said upper and lower disc portion yieldably urging said disc portions away from each other.

2. The disc of claim 1 wherein said disc portions are cup-shaped.

3. The disc of claim 1 wherein said spring means comprises a a plurality of compression springs positioned between and engaging said disc portions.

4. The disc of claim 1 wherein said one of said disc portions partially embraces the other of said disc portions.

5. The disc of claim 1 wherein said disc portions are comprised of stainless steel.

6. The disc of claim 1 wherein said spike means comprises a plurality of spaced apart spike members.