SEMI-CONSTRAINED BONE SCREW AND INSERTION INSTRUMENT
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United States of America Patent
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Issued Date -
Apr 27, 2017
app pub date -
Oct 24, 2016
filing date -
Oct 23, 2015
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Abstract
A bone screw for attaching a spinal prosthetic or bone plate to bone includes a tubular body having open proximal and distal ends. The open proximal and distal ends define a passageway therethrough. A shaft is insertable into the passageway and includes a distal tip that extends beyond the open distal end. The shaft is insertable through a lumen of a head of the bone screw. A gap is defined between a distal surface of the head and a proximal end of the tubular body. The shaft is rotationally fixed with the tubular body and the head. The head is repositionable with respect to the shaft such that an acute angle is defined between the head and a longitudinal axis of the shaft.
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