Efficiently delivering acoustic stimulation energy to tissue
A system for delivering an electrical stimulation pulse to tissue comprises a controller-transmitter and a receiver-stimulator. The controller-transmitter includes circuitry having an energy storage capacitor. The capacitance of the energy storage capacitor is adjusted to improve the efficiency of energy delivered from the receiver-stimulator to tissue by modifying the geometry of an acoustic drive burst from the controller-transmitter.
1. A system for delivering an electrical stimulation pulse to tissue, said system comprising:
a controller-transmitter having circuitry which produces an acoustic transmission waveform having an envelope and includes an energy storage capacitor; and
a receiver-stimulator having a circuitry which includes an envelope detector which receives the acoustic transmission and produces an electrical stimulation pulse having a voltage proportional to the amplitude of the acoustic transmission envelope and wherein the receiver-stimulator is adapted to deliver a stimulation pulse to cardiac tissue to effect pacing and wherein the acoustic transmission has an envelope selected to compensate for the tissue-electrode impedance;
wherein the capacitance of the energy storage capacitor is selected to produce an acoustic transmission with an envelope of decreasing amplitude.
2. A system as in any of claims 1 , wherein the controller-transmitter is implanted.
3. A system as in any of claims 1 , wherein the controller-transmitter is external.