Blood coagulation test cartridge, system, and method

Details Blood coagulation test cartridge, system, and method Blood coagulation test cartridge, system, and method

2005-01-31

2008-10-21

Wallenhorst, Maureen M (Department: 1797)

Chemistry: analytical and immunological testing

Clotting or clotting factor level tests

C436S063000, C436S148000, C436S180000, C422S068100, C422S073000, C422S105000, C435S013000, C073S064410, C600S369000

Reexamination Certificate

active

07439069

ABSTRACT:
A system and method for determining a coagulation time, e.g., thrombin time, PT, aPTT, and ACT, of a blood sample deposited in a test cartridge is disclosed. The test cartridge includes a blood receptacle that is open to the atmosphere into which a blood sample is to be deposited, a vacuum port that is open to atmosphere, and a spiral capillary within the test cartridge having a capillary length and cross-section area, a first capillary end of the spiral capillary open to the blood receptacle and a second capillary end of the spiral capillary open to the vacuum port, whereby the spiral capillary is closed to atmosphere. When a blood sample is deposited in the blood receptacle, a vacuum is drawn through the vacuum port and the blood is drawn through the spiral capillary until coagulation occurs. A pressure change is detected, and the coagulation time is measured.

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