Spinal connecting members with tensioned cords and rigid sleeves for engaging compression inserts

摘要

A spinal implant having at least two bone anchors includes a longitudinal connecting member assembly having hard, non-elastic sleeves for attachment to the bone anchors, at least one spacer located between the bone anchors, and in some embodiments, an end elastic bumper and cord blocker. A cord is received within the rigid sleeves, the spacer and the bumper, the cord being in fixed or sliding relationship with cooperating sleeves. The sleeves include portions for direct engagement with bone screw inserts and closure tops and may include a channel for receiving a projected portion of a spacer.

主权项

1. In a medical implant assembly having first and second bone attachment structures cooperating with a longitudinal connecting member having a tensioned cord and a spacer, the spacer located between the first and second bone attachment structures, the tensioned cord extending through the spacer, the first bone attachment structure having a first pair of opposed upstanding arms, the improvement wherein:
a) the first bone attachment structure being a pivotal bone anchor and having:
i) a shank pivotable with respect to a receiver; andii) a compression insert within the receiver engaging the shank, the compression insert having a second pair of opposed upstanding arms forming a channel, each second pair of opposed upstanding arms of the compression insert having top surfaces; b) a sleeve for attachment to the pivotal bone anchor, the sleeve having:
i) a first through bore sized and shaped for slidably receiving the tensioned cord, andii) first and second body portions, the first body portion sized and shaped for being closely received within the insert and the second body portion being sized and shaped to be received between the first pair of opposed upstanding arms of the pivotal bone anchor, the second body portion also engaging the top surfaces of the second pair of upstanding arms of the compression insert.