Sensors for assaying coagulation in fluid samples
First Claim
1. A test sensor for a blood coagulation assay comprising at least one transducer coated with a polymer layer, wherein the polymer layer is a porous support layer that comprises immobilized therein a thrombin-cleavable peptide, and wherein the thrombin-cleavable peptide comprises a detectable moiety linked by a thrombin-cleavable amide bond to a polypeptide sequence that is non-reactive with blood proteases other than thrombin.
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Accused Products
Abstract
The present invention relates to analytical testing devices including micro-environment sensors and methods for assaying coagulation in a fluid sample applied to the micro-environment sensors, and in particular, performing one or more types of coagulation assays using one or more micro-environment sensors in a single point of care combined test cartridge. For example, the present invention may be directed to test sensor including at least one transducer coated with a polymer layer. The polymer layer comprises a thrombin-cleavable peptide with a detectable moiety.
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Citations
63 Claims
- 1. A test sensor for a blood coagulation assay comprising at least one transducer coated with a polymer layer, wherein the polymer layer is a porous support layer that comprises immobilized therein a thrombin-cleavable peptide, and wherein the thrombin-cleavable peptide comprises a detectable moiety linked by a thrombin-cleavable amide bond to a polypeptide sequence that is non-reactive with blood proteases other than thrombin.
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55. A method for performing multiple diagnostic clotting time tests on a whole blood sample, the method comprising:
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providing a point-of-care test device with two or more test sensors for performing the diagnostic clotting time tests, each of the two or more test sensors comprising at least one transducer coated with a polymer layer, wherein the polymer layer is a porous support layer that comprises immobilized therein a thrombin-cleavable peptide, wherein the thrombin-cleavable peptide comprises a detectable moiety linked by a thrombin-cleavable amide bond to a polypeptide sequence that is non-reactive with blood proteases other than thrombin, and wherein the two or more test sensors comprise a micro-environment prothrombin time (PT) sensor disposed in a first region of a conduit within the test device and a micro-environment activated partial thromboplastin time (aPTT) sensor in a second region of the conduit; amending the whole blood sample with a PT reagent in the first region and an aPTT reagent in the second region; waiting a predetermined amount of time for the amended whole blood sample to diffuse into a first thrombin-cleavable peptide, which is an immobilized PT substrate, in the first region and a second thrombin-cleavable peptide, which is an immobilized aPTT substrate, in the second region; and determining a PT using the PT sensor, and an aPTT using the aPTT sensor.
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56. A method for performing multiple diagnostic clotting time tests on a whole blood sample, the method comprising:
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providing a point-of-care test device with two or more test sensors for performing the diagnostic clotting time tests, each of the two or more test sensors comprising at least one transducer coated with a polymer layer, wherein the polymer layer is a porous support layer that comprises immobilized therein a thrombin-cleavable peptide, wherein the thrombin-cleavable peptide comprises a detectable moiety linked by a thrombin-cleavable amide bond to a polypeptide sequence that is non-reactive with blood proteases other than thrombin, and wherein the two or more test sensors comprise a micro-environment prothrombin time (PT) sensor disposed in a first region of a conduit within the test device and a micro-environment activated clotting time (ACT) sensor in a second region of the conduit; amending the whole blood sample with a PT reagent in the first region and an ACT reagent in the second region; waiting a predetermined amount of time for the amended whole blood sample to diffuse into a first thrombin-cleavable peptide, which is an immobilized PT substrate, in the first region and a second thrombin-cleavable peptide, which is an immobilized ACT substrate, in the second region; and determining a PT using the PT sensor, and an ACT using the ACT sensor.
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Specification