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Flow-through resistivity cell

  • US 4,899,759 A
  • Filed: 01/17/1989
  • Issued: 02/13/1990
  • Est. Priority Date: 01/17/1989
  • Status: Expired due to Term
First Claim
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1. A blood resistivity measuring apparatus comprising:

  • (a) cell means disposed along the length of a tubular intravascular catheter and having an internal chamber of known dimensions for intermittently and statically containing a predetermined volume of a patient'"'"'s blood being drawn through said catheter, said cell means including a plurality of electrodes longitudinally spaced from one another and exposed to the interior of said chamber, means for applying a sinusoidal constant current signal across a predetermined pair of said plurality of electrodes for allowing the impedance of the blood between a further pair of said plurality of electrodes intermediate said predetermined pair to be measured, in situ.

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