General Voltage Injection Device for Immunity Test of Active Implantable Neurostimulators to Electromagnetic Fields over the Frequency Range 16.6Hz to 80MHz

A general voltage injection testing device is presented to test the immunity of active implantable neurostimulator (INS) to electromagnetic fields over the frequency range 16.6Hz to 80MHz. The proposed device consists of test circuit and transfer tooling, which is designed to conduct Electromagnetic Compatibility (EMC) test of INS with output-only functionality. In the test circuit, a tissue-electrode interface model and its board layout are provided to satisfy impedance continuity and test channel consistency. In order to adapt to different types of stimulators and electrode specifications, transfer circuits and several kinds of transfer tooling are created. In accordance with ISO14708-3, Voltage injection tests have been carried out with the device and an INS with 16 electrodes. The results show that the device can meet test requirements and is useful for EMC test. Besides, the device can provide references for other manufacturers and organizations to accomplish voltage injection test.