Surgery – Blood drawn and replaced or treated and returned to body
Patent
1988-12-23
1990-10-23
Wax, Robert A.
Surgery
Blood drawn and replaced or treated and returned to body
436 70, A61M 3700
Patent
active
049648470
ABSTRACT:
During an initial priming procedure, the blood draw/return needle(s) fluid flow system is primed with a nonblood fluid (e.g. a saline solution) having known fluid viscosity. The pressure drop occurring across the needle orifice(s) is determined at a knonw flow rate for this predetermined fluid of known viscosity. During subsequent blood constitutent processing operations, the pressure drop across the needle orifice is measured for a second known flow rate of blood constituents. From these measured relative values of pressure and flow rates, the blood viscosity value can be calculated and used to estimate (e.g. via a table look-up or analytical calculation procedure) a hematocrit value of the blood constitutents as a function of the measured blood viscosity value.
REFERENCES:
patent: 1963011 (1928-02-01), Albersheim et al.
patent: 3549994 (1970-12-01), Rothermel et al.
patent: 4030888 (1977-06-01), Yamamoto et al.
patent: 4340565 (1982-07-01), Kitajima et al.
patent: 4491012 (1985-01-01), Peterson
patent: 4650458 (1987-03-01), Dahlberg et al.
patent: 4680025 (1987-07-01), Kruger et al.
"Experimental Methods for Engrs." Holman, McGraw Hill, 2nd Edition, pp. 296, 297.
Laboratory Techniques Appendix--Chapter A31, "Serum Viscosity" by William J. Williams--p. 1660.
Clinical Manifestations of Erythrocyte Discorders--Chapter 8, p. 61 and Clinical Manifestations of Granulocyte and Monocyte Disorders--Chapter 9 by Marshall A. Litchman, pp. 62-33.
Swank, Roth and Jansen--Journal of Applied Physiology "Screen Filtration Pressure Method and Adhesiveness and Aggregation of Blood Cells," vol. 19, (1964), pp. 340-346.
From the Department of Surgery, Tulane University, New Orleans, Louisana "Screen Filtration Pressure and Quantity of Microaggregates: A Nonexisting Relationship" by B. Risberg, vol. 19, No. 6--pp. 749-753.
Microvascular Research 3,--"Hemolysis During Filtration Through Micropores: A Scanning Electron Microscopic and Hemorheologic Correlation" by Chien et al., College of Physicians and Surgeons, Columbia University, New York, N.Y.
Developments in Hematology and Immunology--"Red Cell Deformability and Filterability"--Proceedings of the Second Workshop Held in London, 23 and 24, Sep. 1982.
Baxter International Inc.
Bostich June M.
Price Bradford R. L.
Wallen T. J.
Wax Robert A.
LandOfFree
Method and apparatus for estimating hematocrit in a blood consti does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for estimating hematocrit in a blood consti, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for estimating hematocrit in a blood consti will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-763791