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Ambient electromagnetic energy harvesting with wireless sensors

  • US 8,874,180 B2
  • Filed: 02/28/2010
  • Issued: 10/28/2014
  • Est. Priority Date: 02/28/2010
  • Status: Active Grant
First Claim
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1. A pulse oximetry sensor, comprising:

  • a power generating structure configured to generate power to recharge a power source of the pulse oximetry sensor in response to ambient electromagnetic signals, wherein the power generating structure comprises one or more antennas and a charging control circuit, and wherein the charging control circuit is configured to;

    determine whether an amount of power generated by each antenna from among the one or more antennas is below a threshold amount of power needed to power the pulse oximetry sensor; and

    generate an error signal if the amount of power generated by the power generating structure is below the threshold;

    a sensing component configured to generate data related to one or more physiological parameters;

    wireless communication circuitry configured to wirelessly transmit the data related to the one or more physiological parameters and configured to wirelessly transmit the error signal, wherein at least one of the sensing component or the wireless communication circuitry are at least partially powered, directly or indirectly, by the power generating structures; and

    a wired port configured to recharge the power source of the pulse oximetry sensor via an external power source.

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