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Hand-held vital signs monitor

  • US 10,426,367 B2
  • Filed: 05/14/2013
  • Issued: 10/01/2019
  • Est. Priority Date: 09/07/2006
  • Status: Active Grant
First Claim
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1. A method of determining a pre-ejection period (PEP) for a patient using a wearable vital signs sensor system, the method comprising:

  • adhesively retaining a sensor component on the body of the patient at a position overlying the patient'"'"'s sternum below the sternal notch, the sensor component comprising (i) an electrical sensor comprising an analog-to-digital converter and processing circuitry that is operably connected to primary, reference, and ground electrodes that measure electrical impulses from the patient indicative of cardiac activity, the electrical sensor generating a first time dependent waveform comprising electrocardiogram signals, and (ii) a piezoelectric sensor that measures low-frequency pressure waves from the patient'"'"'s heart, the piezoelectric sensor generating a second time-dependent waveform comprising pressure wave frequency components from 40-500 Hz;

    receiving the first time-dependent waveform and the second time-dependent waveform at a microprocessor configured toprocess the first time-dependent waveform to identify a first signal indicative of onset of a cardiac cycle,process frequency components between 40-500 Hz in the second time-dependent waveform to identify a second signal indicative of end of the PEP in the cardiac cycle,determine a PEP for the cardiac cycle as the time separating the first signal and the second signal, andcause the PEP for the cardiac cycle to be displayed on a display element operably connected to the microprocessor; and

    causing the sensor component and the microprocessor to determine and display PEP for the patient in a continuous fashion for a plurality of cardiac cycles.

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