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MRI-safe implant electronics

  • US 9,008,792 B2
  • Filed: 08/17/2010
  • Issued: 04/14/2015
  • Est. Priority Date: 08/20/2009
  • Status: Active Grant
First Claim
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1. A power supply arrangement for an implantable electronic system comprising:

  • a main implant power supply comprising;

    i. an implant receiver coil L101 and a parallel capacitor C101 arranged to form a resonant circuit that receives an externally generated RF signal,ii. a Schottky diode D101 in series with the L101/C101 resonant circuit and configured to rectify the RF signal received by the L101/C101 resonant circuit, andiii. a power supply output circuit comprising an output capacitor C102 in parallel with an overvoltage Zener diode D102, the power supply output circuit being arranged in parallel with the Schottky diode D101 and the L101/C101 resonant circuit to receive the rectified RF signal from the Schottky diode D101 and develop a main implant power supply voltage output during normal operation of the implantable electronic system; and

    an implantable magnetic resonance imaging (MRI) power supply arrangement comprising;

    i. an MRI inductance L102 configured to have broad-band inductive coupling characteristics to sense RF pulses from MR scanner fields during MRI, andii. an MRI rectifier diode D103 in series with the MRI inductance L102 and arranged to rectify the RF pulses sensed by the MRI inductance L102 during MRI;

    wherein the MRI power supply arrangement is arranged in parallel with the power supply output circuit and in parallel with the Schottky diode D101 and the L101/C101 resonant circuit so as to cooperate with the main implant power supply to provide a high impedance state power supply voltage output during MRI.

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