Patent ID: 7695502
Filing Date: 2010-04-13
Classification: A61B

Abstract:
1. A bone fixation system, comprising: a substantially rigid plate having a bone contacting surface and defining a set of screw holes with internal threads, with said internal threads of said screw holes having a hand of rotation and defining respective screw hole axes; a set of a first-type of locking screws, each respective first-type of locking screw having a head with an external thread that is adapted to self-tap into the internal thread of a given screw hole at an oblique angle relative to said respective screw hole axis to secure said first-type of locking screw to said plate, said external thread of each respective first-type of locking screw comprises a reverse-handed external thread having a reverse-handed rotation relative to said hand of rotation of said internal thread of said screw holes; and a set of second-type of locking screws, each respective second-type of locking screw having a head with an external thread that is adapted to threadably engage the internal thread of a given screw hole to secure the respective second-type of fixation locking screw at a fixed angle relative to said plate in alignment with the respective screw hole axis, said external thread of said second-type of locking screw having a same-handed rotation relative to said hand of rotation of said internal thread of said screw holes.