Centrifuged material layer measurements taken in an evacuated tu

Details Centrifuged material layer measurements taken in an evacuated tu Centrifuged material layer measurements taken in an evacuated tu

1990-09-05

1992-02-11

Hafer, Robert A.

Surgery

Truss

Pad

128760, 210789, A61B 514

Patent

active

050867849

ABSTRACT:
Centrifuged material layer measurements are made in an evacuated glass or clear plastic tube which contains a float. When possibly contaminated materials, such as blood, are being tested the use of the evacuated tube allows the measurements to be made without the technician being exposed to the blood. The tubes are large enough to hold approximately one ml of blood, and are filled with an inert gas at low pressure. Dimensional tolerances relative to those of a capillary tube are relaxed for the tube and float due to the larger sample capacity. The cell bands are stabilized by a layer of a flowable material which settles onto the plasma layer during centrifugation and forms a pellicle thereon.

REFERENCES:
patent: 3931018 (1976-01-01), North, Jr.
patent: 4012325 (1977-03-01), Columbus
patent: 4492634 (1985-01-01), Villa-Real
patent: 4770779 (1988-09-01), Ichikawa et al.
patent: 4774965 (1988-10-01), Rodriguez et al.
patent: 4853137 (1989-08-01), Ersson
patent: 4867887 (1989-09-01), Smith

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