Blood coagulation monitoring device with liquid crystal and gradient heater
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United States of America Patent
Stats
-
Jun 1, 1999
Grant Date -
N/A
app pub date -
Dec 12, 1997
filing date -
Dec 12, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device and method are disclosed for determining whether or not an individual's blood coagulation time is in a normal or abnormal range, and is particularly suitable for measuring prothrombin time and activated partial thromboplastin time coagulation values. The device includes a housing with an area for receiving a sample, a capillary channel or elongated area with an absorbent material, and a gradient heater. Liquid crystal and a coagulation agent can be disposed within the device to mix with a sample added to the device. The mixture passes along the capillary channel or absorbent material and stops moving when the sample has clotted. Due to the gradient heater and liquid crystal, the mixture may or may not change color, depending upon whether the individual has a an abnormally short, normal, or abnormally long clot time.
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