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Intervertebral disc prosthesis for the cervical spine in the dog

  • US 8,491,655 B2
  • Filed: 06/22/2010
  • Issued: 07/23/2013
  • Est. Priority Date: 01/19/2007
  • Status: Active Grant
First Claim
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1. A combination comprising a barrel holder apparatus for intervertebral disc prosthesis and an intervertebral disc prosthesis, wherein the barrel holder apparatus comprises:

  • a first end having one or more apertures, wherein the aperatures are non-movable relative to each other and are shaped to hold removable pins while the prosthesis is being implanted, to prevent a first disc and a second disc of the prosthesis from separating, the removable pins being pre-threaded into the first disc and the second disc of the prosthesis prior to the implantation of the prosthesis; and

    a second end located opposite to the first end, the second end having an opening shaped to hold one of the removable pins, while the barrel holder is being rotated to unthread the removable pin out of the prosthesis after the implantation is completed and a second disc;

    and wherein the invertebral disc prosthesis comprises a first disc and a second disc, wherein the first disc comprises;

    a first disc body with top and bottom surfaces,wherein the top surface has a protrusion being unitary with the top surface, andwherein the bottom surface is convex;

    the second disc comprises;

    a second disc body with top and bottom surfaces,wherein the bottom surface is convex and comprises a concentric groove, andwherein the top surface has a socket recessed therein;

    wherein the protrusion of the first disc is sized and shaped to pivot in the socket of the second disc; and

    wherein the first and second discs remain substantially parallel to and axially spaced from each other with their top surfaces facing each other;

    wherein the first disk coaptates with the second disk to provide pivoting movement, the movement having a range of motion with approximately thirty degrees of freedom; and

    wherein when the cervical disc prosthesis is implanted between adjacent vertebrae, the first and second discs remain operably connected to each other without a locking mechanism.

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