Polyaxial bone anchor assembly with one-piece closure, pressure insert and plastic elongate member

  • US 8,353,932 B2
  • Filed: 08/20/2008
  • Issued: 01/15/2013
  • Est. Priority Date: 09/30/2005
  • Status: Active Grant
First Claim
Patent Images

1. In a medical implant assembly having at least one polyaxial bone screw attached to a longitudinal connecting member, the bone screw having a receiver with a channel, the improvement wherein:

  • a) at least a portion of the longitudinal connecting member is sized and shaped to be received in the receiver channel; and

    further comprising;

    b) a compression insert directly engaging both the longitudinal connecting member and a shank of the polyaxial bone screw, the insert having a base, a pair of opposed arms with outer receiver engaging portions, and the opposed arms defining a through channel with a lower connecting member seating surface;

    whereinc) the compression insert is top-loadable in the receiver in a first orientation, wherein, when in the first orientation, the compression insert through channel is substantially perpendicular to the receiver channel, and then rotated to a second orientation, such that the compression insert through channel is substantially parallel to the receiver channel and cooperating receiver portions snap into the receiver engaging portions.

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