A Low Cost Design of Powered Ankle-Knee Prosthesis for Lower Limb Amputees - Preliminary Results Topics: Artificial Limbs; Biomechanical Devices; Biorobotics; Low-Power Design In Proceedings of the International Conference on Biomedical Electronics and Devices - Volume 0BIOSTEC, 253-258, 2014 , ESEO, Angers, Loire Valley, France