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Non-invasive method and device for measuring cardiac output

  • US 8,721,559 B2
  • Filed: 01/05/2009
  • Issued: 05/13/2014
  • Est. Priority Date: 01/04/2008
  • Status: Expired due to Fees
First Claim
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1. A system for measuring cardiac parameters of the heart of a person, comprising:

  • a device comprising a housing containing a signal generator coupled to an antenna and a dielectric material disposed about the antenna, wherein said device is adapted to repeatedly generate a sweep of radio frequency signals at a plurality of frequencies and direct said signals towards the heart of the person and measure magnitudes of signals returned off the heart of the person; and

    a processor contained within said housing, said processor being adapted to compare magnitudes of the radio frequency signals propagated into the heart of the person and magnitudes of the signals returned from the heart to determine return loss values for each of the radio frequency signals,said processor being adapted to determine a maximum return loss value for each sweep of radio frequency signals and estimate a change in the amplitude of motion of a portion of a wall of the heart based on changes in the maximum return loss values.

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