U.S. patent application 20180021152 (applicant Leto Solutions Inc., San Antonio, Texas):
"A prosthesis cooling system may comprise one or more thermoelectric cooling devices embedded in a prosthesis socket, a power source, and a power control circuit. The cooling system may use active or passive cooling, and may use a closed-loop temperature control system. ... In some embodiments, a phase-change material (PCM) may be used to assist in removing waste heat from the prosthesis"