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Transdermal neurostimulator adapted to reduce capacitive build-up

  • US 9,474,891 B2
  • Filed: 05/18/2015
  • Issued: 10/25/2016
  • Est. Priority Date: 05/25/2014
  • Status: Active Grant
First Claim
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1. A transdermal neurostimulator device, the device comprising:

  • a housing enclosing a current source;

    a first surface on the housing;

    a first connector and a second connector, wherein the first connector is configured to electrically connect with a first electrode of an electrode apparatus and the second connector is configured to electrically connect with a second electrode; and

    a controller within the housing, the controller comprising;

    a waveform generator configured to deliver a pulsed, asymmetric, biphasic current between the first and second connectors, anda capacitive discharge circuit triggered by the controller and connected to one or both of the first and second connectors and configured to deliver a gradual capacitive discharging current pulse during a portion of a cycle of the biphasic electrical stimulation signal, the capacitive discharging current pulse delivering either or both;

    a first charge to counter a first capacitive charge on the first electrode, and a second charge to counter a second capacitive charge on the second electrode, wherein the capacitive discharge circuit includes a double H-Bridge circuit configured to generate the gradual capacitive discharging pulse.

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