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System for stabilizing the cervical and the lumbar region of the spine

  • US 5,470,333 A
  • Filed: 06/10/1993
  • Issued: 11/28/1995
  • Est. Priority Date: 03/11/1993
  • Status: Expired due to Fees
First Claim
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1. A system for stabilizing the lumbar region of the spine and reducing displacement of the spine resulting from spondylolisthesis comprising:

  • first and second transverse plates for securing to vertebra L4;

    third and fourth transverse plates for securing to vertebra L5, said first, second, third, and fourth transverse plates each including at one end an eye plate that includes an eye for receiving a bone engaging fastener along a first axis and extending from the eye plate two substantially parallel spaced-apart fingers of substantially equal length, said spaced-apart fingers including a posterior surface and an opposing anterior surface, the anterior surface of said spaced-apart fingers of said first and third transverse plates being textured and the posterior surface of said spaced-apart fingers of said second and fourth transverse plates being textured, wherein the anterior surface of said spaced-apart fingers of said first and third transverse plates face the posterior surface of said spaced apart fingers of said second and fourth transverse plates, respectively;

    first and second sacral plates, said sacral plates each including a substantially planar body having a plurality of bores for rigidly fixing said sacral plates independently to opposite lateral portions of a sacrum, extending from each body are two spaced-apart fingers of substantially equal length having posterior and opposing anterior surfaces, the anterior surface of the spaced-apart fingers of said first sacral plate being textured and the posterior surface of the spaced-apart fingers of said second sacral plate being textured, wherein the anterior surface of the spaced-apart fingers of said first sacral plate face the posterior surface of the spaced apart fingers of the second sacral plate;

    longitudinal member including a superior end and an inferior end connected by spaced-apart members, said superior and inferior end and said spaced-apart members defining a slot in said longitudinal member;

    a first fastener for securing the first and second transverse plates to one another and to the longitudinal member, the first fastener extending between the spaced-apart fingers of the first and second transverse plates and between the spaced-apart members of the longitudinal member when fastened;

    a second fastener for securing the third and fourth transverse plates to one another and to the longitudinal member, the second fastener extending between the spaced-apart fingers of the third and fourth transverse plates and between the spaced-apart members of the longitudinal member when fastened;

    a third fastener for securing the first and second sacral plates to one another and to the longitudinal member, the third fastener extending between the spaced-apart fingers of the first and second sacral plates and between the spaced-apart members of the longitudinal member; and

    a hook assembly for securing to vertebra L3 and said longitudinal member.

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