A semi-actuated above knee prosthetic system, which is mostly passive in nature and includes a shank link coupled to an artificial foot, a knee mechanism connected to the shank link and a thigh link attached to an above-knee remaining lower limb of an amputee, is operable in either an actuated mode or an un-actuated mode controlled by a signal processor linked to various prosthetic mounted sensors. In the actuated mode, power is delivered to a torque generator connected to the knee mechanism to cause a forced movement between the thigh and shank links. In the un-actuated mode, a control circuit operates in a non-powered manner to allow operation of the knee mechanism with modulated resistance. Power is delivered through an electric motor connected to a battery source and employed to drive a hydraulic pump which is part of an overall hydraulic power unit including the torque generator.

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A lower extremity exoskeleton (100), configurable to be coupled to a person, includes two leg supports (101, 102) configurable to be coupled to the person’s lower limbs, an exoskeleton trunk (109) configurable to be coupled to the person’s upper body, which is rotatably connectable to the thigh links (103, 104) of the leg supports (101, 102) allowing for the flexion and extension between the leg supports (101, 102) and the exoskeleton trunk (100), two hip actuators ( 145, 146) configured to create torques between the exoskeleion trunk (109) and the leg supports (101, 102), and at least one power unit (201) capable of providing power to the hip actuators (145, 146) wherein the power unit (201) is configured to cause the hip actuator (145, 146) of the leg support (101, 102) in the swing phase to create a torque profile such that force from the exoskeleton leg support (101, 102) onto the person’s lower limb during at least a portion of the swing phase is in the direction of the person’s lower limb swing velocity.

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