Trask, Britt & Rossa
System and method for in-vivo hematocrit measurement using impedance and pressure plethysmography
 The hematocrit of blood (i.e., the percentage of whole blood volume occupied by red blood cells) perfusing a finger is determined by stimulating the finger with two current frequencies, one relatively high (e.g., 10 MHZ) and the other relatively low (e.g., 100 KHz). Voltages induced in the finger in response to the two current frequencies are then captured and separated into baseline and pulsatile components. The hematocrit is determined as a function of the ratio of the high frequency pulsatile component to the low frequency pulsatile component, multiplied by the ratio of the square of the low frequency baseline component to the square of the high frequency baseline component. The signal-to-noise ratio of the captured voltages can be enhanced by the application of external pressure to the finger, such as by applying a pressure cuff to the finger. 
Microcor, Inc.
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A61B A61B H04B A61B
inventional inventional inventional inventional
Justin S. Allan L. Robert Gail Jon Ke-shieng
Clark Kaminsky Billings Neese Yang