the mechanical device, roto-translational, with variable center of rotation
By applying mathematical analysis previously reported to the experimental results, it was possible to "draw" the knee path in its physiological motion.
It was therefore designed a device, structured with two plates, a femoral and a tibial one, on which an handling driven system has been reproduced, which consists of two pins (placed on the femoral plate) which slide into two slots (placed on the tibial plate).
The first pin, central, was placed on one end of the femoral plate (at the intersection of the axes x, y); similarly on the end of the tibial plate a hole has been made as the starting point of a linear slot which develops along the x axis with an extension equal to Δx.135 degrees.
The second pin was placed on the femoral plate but on the y axis at a distance Ra. At the same point, but on the tibial plate, a hole has been realized from which an opening device, circular for the first 30 degrees and, for the remaining 105 degrees, spiral falling towards the center has been developed.
The first pin, central, was placed on one end of the femoral plate (at the intersection of the axes x, y); similarly on the end of the tibial plate a hole has been made as the starting point of a linear slot which develops along the x axis with an extension equal to Δx.135 degrees.
The second pin was placed on the femoral plate but on the y axis at a distance Ra. At the same point, but on the tibial plate, a hole has been realized from which an opening device, circular for the first 30 degrees and, for the remaining 105 degrees, spiral falling towards the center has been developed.
The mechanical device thus structured can be used on all the orthopedic-rehabilitation equipments which assist the knee in its flexion-extension movement.
