Patent ID: 7857833
Filing Date: 2010-12-28
Classification: A61B

Abstract:
1. An orthopedic assembly, comprising: a bone fixation assembly having a bone anchor adapted to be secured to a first skeletal member and a housing member having a rod member-receiving portion that receives an elongated rod member, wherein the bone fixation assembly contains a deployable locking mechanism that is adapted to reversibly affix the elongated rod member onto the rod member receiving portion; the elongated rod member being comprised of at least one rod member and at least one rotational flexure bearing wherein the at least one rod member and the at least one rotational flexure bearing are coaxially aligned along a central axis, wherein the elongated rod member extends from a proximal end along the central axis for a total length of a first distance, wherein the flexure bearing extends along the central axis for a second distance, and wherein the first distance is greater than the first distance; the flexure bearing having at least a first and second cylindrical member, wherein each cylindrical member has an outer cylindrical surface and a concentric internal cylindrical surface, wherein the first and second cylindrical members are coaxially aligned, and wherein the first and second cylindrical members can rotate relative to one another along the central axis; wherein the first and second cylindrical members are joined by at least one spring member that extends from the internal concentric surface of the first cylindrical member to the internal concentric cylindrical surface of the second cylindrical member and wherein the first cylindrical member is separated from direct threaded engagement with the second cylindrical member.