A polyaxial bone screw assembly includes a threaded shank body having an upper capture structure, a head and a multi-piece retainer, articulation structure. The geometry of the retainer structure pieces corresponds and cooperates with the external geometry of the capture structure to frictionally envelope...http://www.google.es/patents/US20060149240?utm_source=gb-gplus-sharePatente US20060149240 - Polyaxial bone screw with multi-part shank retainer
Polyaxial bone screw with multi-part shank retainer
Número de solicitud: 11/281,818 Número de publicación: US 2006/0149240 A1 Fecha de presentación: 17 Nov 2005 Patente emitida: US7625396 ( Fecha de emisión 1 Dic 2009)
