Fig. 1From: Development of a battery-free ultrasonically powered functional electrical stimulator for movement restoration after paralyzing spinal cord injuryBenchtop setup for determination of the best piezoelectric material for prototyping the stimulator. Ultrasound signal was generated by the ultrasound probe driven by a power amplifier with input signal from a function generator. Ultrasound gel was used between the ultrasound probe and the piezoelectric disc. The piezoelectric voltage was measured across a load resistance connected to the piezoelectric discBack to article page