Measuring the change of intravascular blood volume during blood

Details Measuring the change of intravascular blood volume during blood Measuring the change of intravascular blood volume during blood

1991-02-25

1993-07-27

Smith, Ruth S.

Surgery

Truss

Pad

604 5, A61B 500

Patent

active

052303411

ABSTRACT:
To determine in simple manner the change of the intravascular blood volume during filtration, in the extracorporeal blood circuit (2) of a blood purification apparatus at least one ultrasonic sensor (15) is arranged which is connected to an evaluating unit (18) which is configured in such a manner that at the start of the filtration a first ultrasonic signal is stored and during the filtration the change of the ultrasonic signals is determined. From the change of the ultrasonic signals the change of the hematocrit is determined and from this the change of the intravascular blood volume is deduced.

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R. N. Greenwood, et al., "Serial blood water estimations and in-line blood fiscometry: the continuous measurement of blood volume during dialysis procedures", Clinical Science (1984) 66, 575-583.
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E. L. Bradley, III, M. D. et al., "The Velocity of Ultrasound in Human Blood under Varying Physiologic Parameters", Journal of Surgical Research, (1972), 12, 290-297.
K. Kirk Shung, Ultrasonic Characterization of Blood, vol. II, Chapter 10, 227-242 1986.

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