Patent ID: 8414630
Filing Date: 2013-04-09
Classification: A61B

Abstract:
1. A bone screw comprising: a head portion; and a shank portion extending longitudinally from said head portion, said shank portion having a longitudinal axis extending a radially extended helical thread having an edge with a corresponding helical groove therein longitudinally extending along said shank portion; and a helical device disposed within at least a portion of said groove having a radially outward expanded condition from and a radially inward compressed condition towards said shank portion; said helical device being biased in said expanded condition and operable to be compressed to said compressed condition; and said groove having a linear length greater than a linear length of said helical device when said helical device is in said expanded condition to allow for linear growth of said helical device as said helical device is compressed into said compressed condition.