Disposable sample card and method of making same

Details Disposable sample card and method of making same Disposable sample card and method of making same

1979-10-29

1981-11-17

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrolyte properties

Using a conductivity determining device

29592R, 29876, G01R 2722

Patent

active

043014143

ABSTRACT:
A disposable sample for use in measuring a parameter of a liquid sample such as the hematocrit and a method of making same. The disposable sample card is a micro-volume conductivity cell precision molded from plastic with built-in stainless steel electrodes. The sample card comprises a planar base portion on which is defined a capillary tube. First and second electrodes are disposed within the capillary tube in a spaced relationship and define a volume within the capillary tube. This volume constitutes a conductivity cell. The sample card may be used with an instrument which basically comprises an electronic portion for processing data obtained from the liquid sample on the sample card, a front-end mechanism for positioning the sample card within the instrument, and a digital display for displaying in eye-readable form the results of a parameter measurement made in the instrument.

REFERENCES:
patent: Re30007 (1979-05-01), Steuer et al.
patent: 3699437 (1972-10-01), Ur
patent: 3781659 (1973-12-01), Ur
patent: 3896373 (1975-07-01), Zelby
patent: 3922598 (1975-11-01), Steuer et al.
patent: 4123701 (1978-10-01), Josefsen et al.
Changes in the Electrical Impedance of Blood during Coagulation, Nature, vol. 226, Apr. 18, 1970, pp. 289 & 270.

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