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Flow meter

  • US 4,240,294 A
  • Filed: 12/15/1978
  • Issued: 12/23/1980
  • Est. Priority Date: 12/16/1977
  • Status: Expired due to Term
First Claim
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1. A flow meter for the registration of pulsating liquid flows, preferably for registration of small blood flows, the flow being measured by means of a differential pressure measurement over a first flow resistance (I) with the resistance R1, and the flow meter comprising, besides the flow resistance I, also a high pressure part in the form of a flow resistance (II) and a lower pressure part in the form of a flow resistance (III) with the resistances R2 and R3, respectively, wherein the resistances R1, R2 and R3 are selected so as to adjust the pressures on each side of the differential pressure meter in phase with each other independent of the frequency of the flow pulsations, the flow resistances (I), (II) and (III) with the resistances R1, R2 and R3, respectively, having moduli of elasticity k1, k2 and k3, respectively, said factors being adapted to fulfill the following formula


  • space="preserve" listing-type="equation">R.sub.2 /k.sub.2 =(R.sub.3 +R.sub.1)/k.sub.3
in which 1/k1 is approximately equal to zero, that is the flow resistance material in the main is inelastic.

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