Method of measuring the fluidity of liquids for medical and pharmaceutical purposes, and apparatus for performing the method
First Claim
1. A method of determining the fluidity of a liquid, such as of blood or serum, in a capillary, for medical and pharmaceutical purposes, comprising the steps of drawing the liquid from a vessel, through a measuring cell containing a capillary tube into a reservoir unit and thereafter returning the liquid to its original vessel through the measuring cell while performing viscosity measurements at a velocity of flow that remains constant for a given period of time, said measured liquid being drawn into and expelled from the measuring cell by pump means through an interposed buffer liquid, such as an infusion solution.
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Abstract
A method and apparatus for determining the fluidity of a liquid such as blood or serum having the steps of drawing the liquid from the source through a capillary tube measuring cell into a reservoir unit and returning the liquid back through the tube at a constant flow velocity while measurements are made. The pressure difference between the ends of the capillary tube are directly related to the viscosity of the liquid.
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Citations
27 Claims
- 1. A method of determining the fluidity of a liquid, such as of blood or serum, in a capillary, for medical and pharmaceutical purposes, comprising the steps of drawing the liquid from a vessel, through a measuring cell containing a capillary tube into a reservoir unit and thereafter returning the liquid to its original vessel through the measuring cell while performing viscosity measurements at a velocity of flow that remains constant for a given period of time, said measured liquid being drawn into and expelled from the measuring cell by pump means through an interposed buffer liquid, such as an infusion solution.
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8. An apparatus for determining the fluidity of a liquid, such as blood or serum, in a capillary, for medical and pharmaceutical purposes comprising:
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a measuring capillary tube having two ends, a diameter, a length and a cross sectional area; a source of the liquid;
first connecting means for interconnecting said source to one end of said capillary tube;a reservoir unit having two ends;
second connecting means connecting one end of said reservoir unit to the other end of said capillary tube;means for drawing in and returning said liquid through said capillary tube operatively associated with the other end of said reservoir unit; third connecting means connecting said means for drawing and returning liquid to the other end of said reservoir unit; and measuring means for measuring the fluidity of the liquid being passed through said capillary tube, said measuring means being operatively connected to said capillary tube. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method of determining the fluidity of a liquid, such as a blood or serum, in a capillary, for medical and pharmaceutical purposes, comprising the steps of drawing the liquid from a vessel, through a measuring cell containing a capillary tube onto a reservoir unit and thereafter returning the liquid to its original vessel through the meauring cell while performing viscosity measurements by determining the pressure difference between the two ends of the measuring capillary tube and converting the result of the measurement into electrical signals which are fed to a computer, said measurements being taken at a velocity of flow that remains constant for a given period of time, the liquid to be measured being forced through the measuring capillary tube at consecutively different velocities which are each kept constant for predetermined periods of time by a means for drawing in and returning the liquid, said means having a programmed control for timing the operation of the same.
Specification