Spinal stabilization device

  • US 8,623,057 B2
  • Filed: 06/17/2011
  • Issued: 01/07/2014
  • Est. Priority Date: 09/24/2003
  • Status: Active Grant
First Claim
Patent Images

1. A flexible, elongated connection unit for stabilizing a human spine where the flexible connection unit is configured to be surgically implanted into the human body adjacent the spine and held in place by at least a first and a second pedicle screw assembly that are configured to be anchored into a first and second, adjacent vertebra, respectively, the flexible, elongated connection unit comprising:

  • (a) a first, metallic rigid portion having an outer surface configured to be secured within the first pedicle screw assembly, the outer surface of the first rigid portion having a dimension;

    (b) a second, metallic rigid portion;

    (c) a cylindrical flexible member directly secured to the first rigid portion and to the second rigid portion, the flexible member having an outer surface having a diameter less than the dimension of the outer surface of the first rigid portion at a position between the first and second rigid portions;

    (d) a longitudinally compressible spacer comprising;

    (1) a metallic, rigid portion having a length and having an inner bore extending the length of the spacer metallic portion, the flexible member extending through the bore of the spacer metallic portion, the inner bore of the spacer metallic portion having a larger dimension than the diameter of the outer surface of the flexible member along the length of the spacer metallic portion bore such that the spacer metallic portion can slide along the outer surface of the flexible member, and where the spacer metallic portion has an outer surface configured to be secured within the second pedicle screw assembly, the spacer metallic portion being located entirely between the first rigid portion and the second rigid portion such that along the length of the connection unit no portion of the spacer metallic portion overlaps with any portion of the first or second rigid portion;

    (2) a first elastomeric portion located at least partially between the first rigid portion and the spacer metallic portion, the first elastomeric portion having a length and having an inner bore extending the length of the first elastomeric portion with the flexible member extending through the bore of the first elastomeric portion;

    (3) a second elastomeric portion located at least partially between the second rigid portion and the spacer metallic portion, the second elastomeric portion having a length and having an inner bore extending the length of the second elastomeric portion with the flexible member extending through the bore of the second elastomeric portion;

    whereby the first and second elastomeric spacer portions limit the sliding of the spacer metallic portion along the flexible member.

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