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Mobile plethysmographic device

  • US 9,144,385 B1
  • Filed: 03/07/2015
  • Issued: 09/29/2015
  • Est. Priority Date: 09/14/2014
  • Status: Active Grant
First Claim
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1. A system for determining a premature atrial contraction event for a patient, the system comprising:

  • a mobile plethysmographic device adapted to be worn on a patient, the mobile plethysmographic device comprising a processor, a memory, an optical sensor and an accelerometer, wherein the optical sensor comprises a plurality of green LEDs and a photodetector; and

    a display;

    wherein the optical sensor is configured to generate an optical signal for the patient through reflection of an applied light from the plurality of green LEDs of the optical sensor and the intensity of the reflected light is received by the photodetector;

    wherein the processor is configured to generate a plethysmographic signal for the patient from the optical signal, the plethysmographic signal comprising a plurality of pulse waves;

    wherein the processor is configured to identify a maximum peak value for each pulse wave of the plurality of pulse waves of the plethysmographic signal to generate a plurality of maximum values of the plethysmographic signal;

    wherein the processor is configured to calculate a plurality of time intervals between adjacent maximum values of the plethysmographic signal;

    wherein the processor is configured to establish a threshold minimum time interval and a threshold maximum time interval for the plurality of time intervals; and

    wherein the processor is configured to determine a premature atrial contraction event for the patient based on an identification of a time interval that is below the threshold minimum time interval followed immediately by a time interval that is above the threshold maximum time interval;

    wherein the processor is configured to use accelerometer information from the accelerometer to validate the premature atrial contraction event by measuring motion activity and verifying the validity of the premature atrial contraction event when the motion measured by the accelerometer remains less than a preset threshold.

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