Patent ID: 6368321
Filing Date: 2002-04-09
Classification: A61B

Abstract:
A swivel head bone screw for surgical implantation; said screw composing:a) a shank having an axis of rotation with a lower threaded portion coaxial with said axis and adapted for implantation into a vertebra; said shank having an upper portion opposite said lower threaded portion; said upper potion having a second thread located thereon; b) a head having a channel adapted to receive a rod member therein; said head including a lower chamber sized and shaped to receive said shank upper portion; c) said head having a threaded first bore communicating between said chamber and an exterior of said head; said bore being sized, shaped and threaded so as to threadably receive said shank upper portion therethrough; said shank upper portion operably passing through said bore and into said chamber during installation and said shank upper portion being swivelable relative to said head when fully in said chamber to allow said head to be captured by but swivelable relative to said shank; d) said head having a threaded second bore intersecting with said chamber; and e) a threaded set screw operably threadedly received in said second bore and being urgeable against said shank upper portion when said shank upper portion is located in said chamber in order to lock said upper portion in position relative to said head.