Orthopedic joint hinge, methods and devices

An orthopedic joint hinge assembly comprising:

• a first cylindrical elongated member;
• a first coupler attached to the first cylindrical elongated member and including a first interface surface;
• a second cylindrical elongated member;
• a second coupler attached to the second cylindrical elongated member and including a second interface surface;
• each of the first and second couplers being constrained to rotate about an axis of rotation, the first and second interface surfaces being offset from the axis of rotation and configured to engage each other to block a relative rotation between the first and second cylindrical elongated members in a first direction about the axis of rotation and separate from each other to permit a relative rotation between the first and second cylindrical elongated members in a second direction about the axis of rotation opposite to the first direction, wherein the each of the first and second cylindrical elongated member has a constant circular cross section along an entire length of the respective first and second cylindrical elongated member, wherein:
• the first coupler comprises a first outer planar surface perpendicular to the axis of rotation and a first inner planar surface perpendicular to the axis of rotation,
• the second coupler comprises a second outer planar surface perpendicular to the axis of rotation and a second inner planar surface perpendicular to the axis of rotation,
• the first inner planar surface to interface with the second inner planar surface,
• the first coupler further comprises a first curved surface transverse to the first inner planar surface, the first curved surface being eccentric to the axis of rotation,
• the second coupler further comprises a second curved surface transverse to the second inner planar surface,
• the second curved surface being eccentric to the axis of rotation, wherein the axis of rotation is offset from a first center with respect to the first curved surface of the first inner planar surface and a second center with respect to the second curved surface of the second inner planar surface, and
• the first and second curved surfaces are configured to contact each other so as to progressively inhibit a relative rotation between the first and second cylindrical elongated members in the first direction about the axis of rotation;
• a coupling shaft to rotationally couple the first coupler with the second coupler
• a first retention member to couple to a first end of the coupling shaft;
• a second retention member to couple to a second end of the coupling shaft opposite to the first end of the coupling shaft, the first and second couplers being disposed between the first and second retention members;
• and
• a screw to engage a threaded hole in the first coupler and the coupling shaft through a hole in a bushing to rotationally fix the first coupler to the coupling shaft.