Method and device for measuring blood coagulation or lysis by viscosity changes
First Claim
1. A single-use electronic device for performing a coagulation or lysis assay of a blood sample, the device comprising:
- a housing having an exterior surface and defining an interior area;
means for receiving the blood sample through the housing into the interior area;
a non-porous substrate positioned within the interior area for receiving the blood sample thereon;
a reagent for accelerating the coagulation of the blood sample positioned on the substrate and in contact with the blood sample;
an electroactive species positioned on the substrate and in contact with the blood sample;
means for measuring the viscosity of the blood sample and generating an electrical signal which correlates to a curve of a coagulation or lysis assay;
processing means being positioned within the interior area and connected to the measuring means for receiving and converting the electrical signal into a digital output corresponding to the coagulation or lysis assay using assay calibration information stored in the processing means; and
display means for visually displaying the digital output external to the housing, the display means being connected to the processing means.
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Abstract
The present invention provides a single-use electronic device and test card for use therein which performs a coagulation or lysis assay of a blood sample. The device includes a housing having an exterior surface and defining an interior area and means for receiving the sample through the housing into the interior space. A non-porous substrate is positioned within the interior space for receiving the sample thereon. A reagent accelerates the coagulation of the sample and is positioned on the substrate and in contact with the sample. Optionally, an electroactive species may also be reacted with the sample. The device also includes means for measuring the viscosity of the sample and generating an electrical signal which correlates to a curve of the coagulation/lysis assay. Processing means positioned within the interior space is connected to the measuring means for receiving and converting the electrical signal into a digital output corresponding to the coagulation/lysis assay using assay calibration information stored therein. Display means visually displays the digital output external to the housing and is connected to the processing means. A method of determining the coagulation or lysis of a sample provides for accelerating the coagulation of the sample by chemically reacting the sample with at least one reagent on the substrate to produce a detectable change in the viscosity of the sample which correlates with the state of coagulation or lysis of the sample and measuring the viscosity of the sample and generating an electrical signal which correlates to a curve of the coagulation/lysis assay.
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Citations
17 Claims
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1. A single-use electronic device for performing a coagulation or lysis assay of a blood sample, the device comprising:
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a housing having an exterior surface and defining an interior area; means for receiving the blood sample through the housing into the interior area; a non-porous substrate positioned within the interior area for receiving the blood sample thereon; a reagent for accelerating the coagulation of the blood sample positioned on the substrate and in contact with the blood sample; an electroactive species positioned on the substrate and in contact with the blood sample; means for measuring the viscosity of the blood sample and generating an electrical signal which correlates to a curve of a coagulation or lysis assay; processing means being positioned within the interior area and connected to the measuring means for receiving and converting the electrical signal into a digital output corresponding to the coagulation or lysis assay using assay calibration information stored in the processing means; and display means for visually displaying the digital output external to the housing, the display means being connected to the processing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A test card for an electronic device which generates a signal having a pre-determined frequency and determines a curve of a coagulation or lysis assay of a blood sample, the test card comprising:
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a non-porous substrate defining a surface for receiving the blood sample; an electroactive species positioned on the substrate and in contact with the blood sample; a reagent initially immobilized on the surface for contact with the blood sample; and a plurality of electrodes being positioned on the substrate and contacting the blood sample, the electrodes adapted to receive and pass the signal into the blood sample, the electrodes generating an electrical signal corresponding to the viscosity of the blood sample which correlates to the curve of the coagulation or lysis assay. - View Dependent Claims (10, 11, 12)
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13. A method of determining the coagulation or lysis of a blood sample, the steps of the method comprising:
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introducing the blood sample to a sample receptor site on a substrate and contacting an electroactive species positioned on the substrate with the blood sample; accelerating coagulation of the blood sample by chemically reacting the blood sample with at least one reagent on the substrate to produce a detectable change in the viscosity of the blood sample which correlates with a state of coagulation or lysis of the blood sample; measuring the viscosity of the blood sample and generating an electrical signal which correlates to a curve of a coagulation or lysis assay; and processing the electrical signal into a digital output corresponding to the coagulation or lysis assay using assay calibration information. - View Dependent Claims (14, 15, 16, 17)
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Specification