Abstract: The subject matter described herein includes an apparatus and a clutch for using controlled storage and release of mechanical energy to aid in locomotion. One exemplary apparatus includes a frame including an upper portion configured to mechanically couple to a leg of the subject on a calf side of an ankle joint of the subject and a lower portion pivotally attached to the upper portion configured to mechanically couple to a foot of the subject on a foot side of the ankle joint of the subject. The apparatus include a rotary clutch and an elastic element coupled between the upper and lower portions of the frame to control periods of energy storage and release by the elastic element.

Abstract: Electromechanical unidirectional rotary clutch systems and methods are disclosed. According to an aspect, a clutch system includes an input member having an axis of rotation. The system also includes an output member defining an interior surface that faces the axis. Further, the system includes multiple pawls attached to the input member and each being configured to be positioned in a first position to engage the interior surface of the output member, and to be positioned in a second position such that the pawls do not engage the interior surface of the output member. The system also includes an electromechanical control configured to move the pawls between the first and second positions for engaging and disengaging the interior surface of the input member.

Abstract: The subject matter described herein includes an apparatus and a clutch for using controlled storage and release of mechanical energy to aid in locomotion. One exemplary apparatus includes a frame including an upper portion configured to mechanically couple to a leg of the subject on a calf side of an ankle joint of the subject and a lower portion pivotally attached to the upper portion configured to mechanically couple to a foot of the subject on a foot side of the ankle joint of the subject. The apparatus include a rotary clutch and an elastic element coupled between the upper and lower portions of the frame to control periods of energy storage and release by the elastic element.