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Composite spinal facet implant with textured surfaces

  • US 9,381,049 B2
  • Filed: 09/25/2013
  • Issued: 07/05/2016
  • Est. Priority Date: 06/06/2008
  • Status: Active Grant
First Claim
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1. A distal leading portion of a composite spinal implant for implantation in a spinal facet joint, the distal leading portion comprising:

  • a distal leading end having a distal surface generally opposite a proximal surface of a proximal trailing end;

    a first surface that is parallel with a second surface, the first and second surfaces extending between the distal leading end and the proximal trailing end, the first and second surfaces having one or more textured features adapted to provide friction with the spinal facet joint; and

    a first side surface generally opposite a second side surface, the first side surface and the second side surface each having a slot extending distally from a notch formed in the proximal surface, the slot including a sloped transition extending from an inner surface of the slot to the respective first or second side surface,wherein the textured features include;

    a first ridge extending along the length of the first side surface, the first ridge including;

    a plurality of first teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the plurality of first teeth including an inner surface generally opposite an outer surface, the inner surface forming a substantially right angle with the first surface, and the outer surface being coplanar and coextensive with the first side surface; and

    another plurality of first teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the other plurality of first teeth including an inner surface generally opposite an outer surface, the inner surface forming a substantially right angle with the second surface, and the outer surface being coplanar and coextensive with the first side surface; and

    a second ridge extending along the length of the second side surface, the second ridge including;

    a plurality of second teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the plurality of second teeth including an inner surface generally opposite an outer surface, the inner surface forming a substantially right angle with the first surface, and the outer surface being coplanar and coextensive with the second side surface, andanother plurality of second teeth having a leading distal face, a trailing proximal face, and a tip formed at an intersection between the leading distal face and the trailing proximal face, each tooth of the other plurality of second teeth including an inner surface generally opposite an outer surface, the inner surface forming a substantially right angle with the second surface, and the outer surface being coplanar and coextensive with the second side surface; and

    for each of the pluralities of teeth;

    each tooth has a height extending from the tooth'"'"'s tip to a respective first or second surface;

    the plurality includes a distal tooth that is proximate to the distal leading end, and a proximal tooth that is proximate to the proximal trailing end; and

    the height of the distal tooth is less that the height of the proximal tooth.

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