Patent ID: 11944439
Assignee: SALUDA MEDICAL PTY LTD
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. An implantable device for controlling electrical conditions of tissue, the device comprising:
a plurality of implantable electrodes including a nominal compensation electrode, a nominal stimulus electrode, a nominal stimulus return electrode, a nominal feedback sense electrode, and at least one nominal measurement electrode, the electrodes being configured to be implanted proximal to neural tissue to make electrical contact with the tissue; and
a first current source, connected to a power supply, and configured to provide an electrical stimulus to be delivered from the nominal stimulus electrode to the neural tissue;
a second current source configured to extract a second current from the tissue via the nominal stimulus return electrode, the second current source being matched with the first current source; and
measurement circuitry for measuring a neural response of the neural tissue to the electrical stimulus from a signal sensed at the at least one nominal measurement electrode;
wherein:
the nominal compensation electrode is connected to an output of a feedback amplifier such that the feedback amplifier drives the neural tissue via the nominal compensation electrode to a desired electrical value in a feedback arrangement in order to improve an electrical condition of the neural tissue for neural response measurement; and
the measurement circuitry is configured to measure the neural response during the improved electrical condition of the neural tissue.