Patent ID: 8792992

Claim:
An implantable or other ambulatory apparatus comprising: an electrostimulation energy storage capacitor, communicatively coupled to a circuit path to provide quasi-constant current neural stimulation through a load from the electrostimulation energy storage capacitor; a current measuring circuit communicatively coupled to the circuit path and configured to obtain a measure of quasi-constant current delivered to the load; a control circuit communicatively coupled to the current measuring circuit, wherein the control circuit is configured to initiate a delivery of biphasic electrical neural therapy to the load including delivery of quasi-constant current neural stimulation during a first phase of the biphasic electrical neural therapy and determine, according to the measure of quasi-constant current delivered to the load, a voltage level sufficient to source the measured quasi-constant current, and initiate adjustment of the voltage level of the storage capacitor to the determined voltage level for a subsequent delivery of quasi-constant current; and a recharge circuit communicatively coupled to a port configured for electrical connection to the load, wherein the recharge circuit includes a recharge capacitor, wherein the recharge capacitor is configured to: store electrical energy from the quasi-constant current neural stimulation during the first phase of the biphasic electrical neural therapy; and discharge the electrical energy to the load during a second phase of the biphasic electrical neural therapy.