×

Noninvasive method of measuring blood density and hematocrit

  • US 20040249292A1
  • Filed: 01/20/2004
  • Published: 12/09/2004
  • Est. Priority Date: 01/21/2003
  • Status: Active Grant
First Claim
Patent Images

1. A method of noninvasively measuring fluid density of a pulsed flow system with non-rigid vessel walls, comprising:

  • a) noninvasively measuring a local relative fluid volume ratio Vb

    Vb, where Vb is a basal volume of fluid in a vessel and Δ

    Vb is a volume change of the fluid in the vessel due to the pulse;

    b) noninvasively measuring a fluid pulse propagation velocity ν

    ;

    c) noninvasively measuring a basal fluid pressure P and a local change in fluid pressure Δ

    P;

    d) calculating fluid density ρ

    b as a function of the local relative fluid volume ratio, the fluid pulse propagation velocity, the basal fluid pressure, and local change in fluid pressure according to the generalized functional relationship F

    (ρ

    b


    v2
    Δ







    P
    )
    =G

    (VbΔ







    Vb
    ,PΔ







    P
    )
    or its derivatives.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×