Patent ID: 9138261
Filing Date: 2015-09-22
Classification: A61B

Abstract:
1. A fastening system, comprising: a housing comprising (i) a base, (ii) an internal surface comprising threads, and (iii) a bore through the base along a first axis; a screw comprising a head and a shaft portion extending from said head, the head configured to be at least partially disposed within the bore, the head comprising a spherical portion and two flat first surfaces that are parallel to each other and separated by a first distance; a cap configured to be at least partially disposed within the bore, the cap comprising a body and two ears depending from the body, each ear comprising one of two flat second surfaces that are parallel to each other and separated by a second distance, the second distance being greater than the first distance, the cap being configured to receive at least a portion of the head with the first surfaces being in close proximity to the second surfaces, a first angular displacement of the shaft portion relative to the first axis in a first plane that passes through the first axis being limited to a first angle by interaction of the first and second surfaces, and a second angular displacement of the shaft portion relative to the first axis in a second plane that passes through the first axis and is perpendicular to the first plane being limited to a second angle that is greater than the first angle; and a locking screw assembly configured to be coupled to the housing, the locking screw assembly comprising (i) a sliding element configured to surround and to slide over a portion of the housing, and (ii) a threaded element captured within the sliding element and configured to engage the threads of the housing.