Weight measurement of blood volume soft-shell venous reservoirs
First Claim
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1. A method of measuring the blood volume in a soft-shell venous reservoir, comprising the steps of:
- a) weighing said reservoir;
b) sensing the hematocrit of the blood in said reservoir;
c) computing the volume of blood in said reservoir as a function of weight and hematocrit; and
d) displaying said computed volume.
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Abstract
An accurate real-time volume measurement of the blood content of a soft-shell venous reservoir is obtained by computing the volume from the weight of the blood in the reservoir modified by the hematocrit of the blood.
20 Citations
6 Claims
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1. A method of measuring the blood volume in a soft-shell venous reservoir, comprising the steps of:
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a) weighing said reservoir; b) sensing the hematocrit of the blood in said reservoir; c) computing the volume of blood in said reservoir as a function of weight and hematocrit; and d) displaying said computed volume. - View Dependent Claims (2)
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3. A system for measuring the blood volume in a soft-shell venous reservoir, comprising:
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a) a scale; b) a soft-shell blood reservoir suspended from said scale; c) a hematocrit sensor so positioned as to sense the hematocrit of the blood in said reservoir; d) said scale and sensor being arranged to produce first and second signals representative, respectively, of the net weight of the contents of said reservoir and of said hematocrit; e) computing apparatus receiving said first and second signals and computing therefrom an indication of the volume of blood in said reservoir; and f) display apparatus connected to said computing apparatus and arranged to display said computed volume. - View Dependent Claims (4, 5, 6)
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5. The system of claim 3, further comprising:
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g) an outlet conduit arranged to convey blood pumped out of said reservoir; and h) a fixed support, said conduit being clamped to said support, with a slack portion of said outlet conduit between the clamping point and said reservoir, so as to damp the transmission of cyclical pumping vibrations to said reservoir.
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6. The system of claim 5, in which said hematocrit sensor is positioned to sense the hematocrit of blood passing through said outlet conduit.
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Specification