Patent ID: 9044218
Filing Date: 2015-06-02
Classification: A61B

Abstract:
1. A surgical distractor, comprising: a base plate having an annular portion; an intermediate stage comprising a ring coupled to the annular portion by a first coupling, the first coupling comprising three helical structures adapted such that the annular portion and the intermediate stage are coupled together at three points spaced apart around the circumference of the annular portion and the intermediate stage; and a distraction plate having a circular portion, the circular portion being coupled to the intermediate stage by a second coupling, the second comprising three helical structures adapted such that the intermediate stage and the distraction plate are coupled together at three points spaced apart around the circumference of the intermediate stage and the circular portion of the distraction plate; wherein the at least one of the helical structures of the first and second couplings are configured to adapt relative rotary movement between the intermediate stage and at least one of the base plate and the distraction plate about an axis of rotation into relative linear movement between the intermediate stage and the base plate or distraction plate along the axis of rotation; and wherein the pitch of each helical structure for each of the first coupling and the second coupling are the same.