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System and method for measurement of vital signs of a human

  • US 9,675,250 B2
  • Filed: 08/26/2011
  • Issued: 06/13/2017
  • Est. Priority Date: 11/01/2010
  • Status: Active Grant
First Claim
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1. A system for optical measuring at least one vital sign of a human, the system comprising:

  • (a) an optical transmitter including;

    an optical emitter configured for generating and applying a pulse width modulated optical signal to a measurement location in a blood perfused body tissue of the human, andan optical signal driver including a pulse generator coupled to the optical emitter and configured for generating a series of electric pulses for driving the optical emitter by turning the optical emitter “

    on”

    or “

    off”

    , thereby to provide pulse width modulated optical signal;

    wherein the optical emitter comprises at least one light source;

    (b) an optical receiver including;

    an optical detector configured for receiving light originated back from at least a portion of the measurement location and generating a photocurrent signal corresponding to a time response of the blood perfused body tissue to the pulse width modulated optical signal, the time response being indicative of the at least one vital sign, anda bandwidth limiting unit coupled to the optical detector, having a predetermined gain and a predetermined bandwidth and configured for generating a voltage signal from photocurrent signal, the voltage signal being amplified to a desired gain level and having a desired band width; and

    (c) a control system including;

    a pulse width modulator coupled to the optical signal driver for adjusting of the width of the electric pulses transmitted to the optical signal driver that includes at least two simultaneous pulse width modulations having different modulation frequencies; and

    a signal analyzer that includes a demodulator for processing the voltage signal from the optical receiver wherein the voltage signal is produced from the pulse width modulated optical signal that includes the at least two simultaneous pulse width modulations having different modulation frequencies;

    wherein the control system is configured for(i) adaptive control of the pulse width modulated optical signal emitted by the optical transmitter by adjusting at least a width of the electric pulses driving the optical emitter to maintain the optical receiver in a non-saturated dynamic range; and

    (ii) processing the voltage signal generated by the bandwidth limiting unit and determining the at least one vital sign.

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