Patent ID: 8066744
Filing Date: 2011-11-29
Classification: A61B

Abstract:
1. A coupling assembly for coupling to an implant having a longitudinal axis, comprising: an anchor member; a receiver member having an anchor member end that cooperates with the anchor member and having an implant receiving aperture for receiving an implant, the receiver member having a shaped inner surface forming a first rotation-limiting feature; and a seat member disposable within the receiver member between the anchor member and the implant receiving aperture, the seat member including a first outer surface portion and a second outer surface portion, the first outer surface portion having a circular perimeter and the second outer surface portion having a non-circular perimeter, the second outer surface portion forming a second rotation-limiting feature, the second rotation-limiting feature having a length and a width, the length being greater than the width, the seat member being arranged so that the length extends in the direction of the longitudinal axis of an implant carried by the seat member, and the seat member being arranged so that the width is transverse to the direction of the longitudinal axis of the implant, the first and second rotation-limiting features being engageable to limit rotation of the seat member relative to the receiver member, wherein the seat member includes a shoulder formed between the circular perimeter of the first outer surface portion and the non-circular perimeter of the outer second surface portion, the shoulder being configured to engage the receiver member and limit axial travel of the seat member within the receiver member.