Patent ID: 9655655
Date: 2017-05-23
CPC Classifications: A61B

Claim:
1. A two step locking screw assembly comprising: a receiving member for receiving a fixation member, a screw having a head and a shank, the head seated in the receiving member; an insert extending inside the receiving member, the insert having a proximal end and a distal end; an outer fastener positioned in the receiving member, the outer fastener having a central opening, a base portion, and a pair of ramped flanges, the base portion of the outer fastener directly engaging the proximal end of the insert, and the distal end of the insert directly engaging the head of the screw, compressing the head of the screw against the receiving member and preventing the screw from moving in polyaxial motion; and an inner fastener disposed inside the central opening of the outer fastener, wherein the outer fastener comprises a tubular body, the tubular body comprising a circumference, with each ramped flange winding around a portion of the circumference and projecting radially outwardly from the tubular body, and wherein the tubular body has a proximal end and a distal end, and wherein each ramped flange extends axially toward the distal end as it winds around the circumference of the tubular body in a clockwise direction.