Prosthetic socket release/relock system

A device configured to be positioned within a prosthetic socket, the device comprising:

• a tether having a first end and a second end opposite the first end, wherein the first end of the tether is configured to be coupled to a prosthetic liner;
• a spool fixed with respect to the prosthetic socket, wherein the second end of the tether is coupled to the spool;
• a motor fixed with respect to the prosthetic socket, the motor comprising a motor encoder;
• a battery configured to provide power to the motor;
• a coupling mechanism configured to transition from a first position in which the spool is only able to rotate in a first direction to a second position in which the spool is able to rotate in the first direction and a second direction;
• a release actuator positioned on an exterior of the prosthetic socket, wherein actuation of the release actuator causes the coupling mechanism to transition from the first position to the second position;
• a tightening actuator positioned on the exterior of the prosthetic socket, wherein actuation of the tightening actuator causes the motor to rotate the spool in the first direction to wind the tether around the spool to thereby reduce a distance between the first end of the tether and the spool;
• and
• a control unit in communication with the motor, wherein the control unit is configured to:
• determine, based on the motor encoder, the distance between the first end of the tether and the spool;
• and
• activate the coupling mechanism based on the determined distance.