“…These were used to calculate the approximate COR as described by previous research here at the Biorobotics Lab at The University of Tennessee. 30,31,32 The distance in x and z (in the coordinate system of Figure 3-9A) from the null tooltip to the thus-calculated approximate COR is entered into the RTP software which then, to direct flexion or extension, rotates the null tooltip around that calculated COR. To achieve the desired degrees of rotation while controlling the applied forces, the RTP software-controlled gimbal first rotated around the COR and then moved in the x and z directions to manage these forces.…”