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ELECTROMAGNETIC FLOWMETER

  • US 3,759,247 A
  • Filed: 07/01/1971
  • Issued: 09/18/1973
  • Est. Priority Date: 08/24/1970
  • Status: Expired due to Term
First Claim
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1. An electromagnetic flowmeter for measuring the blood flow pulse in a blood Vessel of a living being comprising:

  • first sensing means adapted to be positioned on the skin of the being at a location where a strong and sharp cardiogram pulse can be repeatedly obtained to be used as a synchronizing signal and as a clock;

    means connected to said first sensing means for providing a synchronizing signal and a clock;

    a permanent magnet for producing a strong and homogeneous magnetic field in the region of said vessel, means for reversing said magnetic field after a given number of heart cycles in accordance with a program controlled by said synchronizing signal, said magnetic field reversing means including a magnetizing coil through which a short duration pulse of D.C. current is applied to reverse the polarity of said permanent magnet;

    second sensing means adapted to be placed on the skin or in the tissue of said being at a location adjacent said vessel;

    amplifier means for amplifying the signal sensed by said second sensing means;

    means for reversing the polarity of said amplifier means during said reversal of said magnetic field; and

    measuring means synchronized by the synchronizing signal for averaging the pulsatile signal sensed by said second sensing means during a given number of heart cycles while the magnetic field is stable at one polarity, and for averaging an equal number of heart cycles after reversal of said polarity of both said magnetic field and said measuring circuit;

    whereby there is obtained the wave shape of the blood flow pulses free from both the local cardiogram and the random noise.

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