Polyaxial screw
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United States of America Patent
Stats
-
Mar 6, 2007
Grant Date -
Feb 16, 2006
app pub date -
Aug 12, 2004
filing date -
Aug 12, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A polyaxial screw is used to secure orthopedic appliances to bone, particularly the spine. The polyaxial screw has a shaft including a helical screw thread for securing the screw to bone. One end of the shaft has a reverse tapered head tapering toward and away from the shaft from an enlarged median. A spherical shaped swivel, having an opening smaller than the median, is snapped over the head to rotatably engage the shaft. A connector with a dome shaped cavity on one end and bifurcated tabs on the other is connected with the swivel and tightened in place with a set screw and guide ring. An appliance is held between the bifurcated tabs. The tabs are frangible to reduce the profile above the appliance.
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