Abstract: Vacuum locking systems for prosthetic limbs are generally disclosed. An example double-wall socket system according to at least some aspects of the present disclosure may include a flexible liner shaped to accept a portion of a residual limb; a plunger pin mounted to a distal end of the flexible liner; an inner socket shaped to receive the flexible liner and the residual limb; an outer socket shaped to receive the inner socket, the flexible liner, and the residual limb; a locking mechanism mounted at least partially within the inner socket approximate a distal end of the inner socket; and a manifold mounted to a distal end of the outer socket. The manifold may be configured to be connected to a vacuum pump for withdrawing air from the double wall socket system.

Abstract: A prosthetic limb lanyard cord retainer spool is provided, which may be mounted onto the side of a prosthetic limb socket to retain slack or excess cord from a lanyard locking system. After the limb has been locked into place, excess cord from the lanyard system may be pressed into a seam formed between the outer wall of the prosthetic limb socket and a radially outer flexible sealing flange of the cord spool to enter a circumferential channel of the cord spool (radially between the outer flexible sealing flange and an inner stem), and may be manually wrapped around the stem of the spool in a circular motion.