US Patent 11147731 Actuator for physical therapy

A robotic system comprising: a joint coupling a linkage to an additional linkage; and at least one cable; wherein the joint includes a motor having a shaft, a strain wave gear having a flexible member coupled to a circular spline, a conduit, and a bearing; wherein the motor is configured to rotate the shaft in a first direction and the strain wave gear is configured to rotate a rotatable member, the rotatable member including one of the flexible member or the circular spline; wherein the conduit is configured to rotate in response to rotation of the rotatable member; wherein the at least one cable passes through both the bearing and into the additional linkage but does not pass through either of the strain wave gear or the motor.