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Non-Invasive Method And Device For Measuring Cardiac Output

  • US 20100022900A1
  • Filed: 01/05/2009
  • Published: 01/28/2010
  • Est. Priority Date: 01/04/2008
  • Status: Active Grant
First Claim
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1. A method for measuring cardiac output of a person, comprising:

  • (a) placing a device about the center of the chest of the person at the mid-sternum position, said device comprising a RF signal generator coupled to an antenna, said antenna having a dielectric material disposed about the exterior of the antenna;

    (b) propagating a first signal having a predetermined frequency towards the heart of the person;

    (c) receiving and measuring a portion of the first signal returned from the heart of the person with the device;

    (d) comparing the magnitude of the first signal propagated into the heart of the person to the magnitude of the portion of the first signal returned from the heart of the person and calculating a return loss of the signal;

    (e) propagating an additional signal into a portion of the heart of the person using the device, wherein said additional signal has a frequency different from the first signal;

    (f) receiving and measuring a portion of the signal returned from the heart of the person with the device;

    (g) comparing the magnitude of the signal propagated into the heart to the person to the magnitude of the additional signal returned from the heart of the person and calculating a return loss of the additional signal;

    (h) comparing the return loss of the first signal to the return loss of the additional signal;

    (i) repeating steps (e) through (h) while incrementally varying the frequency of the signal with each repetitive step; and

    (j) determining a maximum return loss value of the signals propagated into the heart of the person over the utilized frequency range; and

    (k) determining the frequency of the maximum return loss signal.

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