Measurement of blood coagulation time using infrared electromagnetic energy
First Claim
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1. A method recording the clotting time of whole blood as it proceeds from fibrinogen through known stages of coagulation, culminating in the cross-linking of the fibrin clot which ultimately solidifies and dries at the end of a cycle, including the steps of:
- providing a measured sample of whole blood to be tested;
transmitting infrared electromagnetic energy through the blood sample;
detecting the transmission of the infrared energy and electronically producing the signals in response to said infrared energy; and
measuring a peak transmission level of said infrared energy and calibrating said peak signal in terms of clotting time of said whole blood sample whereby the clotting time is represented by the peak transmission level of the infrared energy through the whole blood sample.
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Abstract
A method and apparatus for detection of blood coagulation using infrared electromagnetic transmission changes through a sample from a source of infrared energy to suitable detection electronics producing a peak signal representative of the clotting time.
56 Citations
13 Claims
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1. A method recording the clotting time of whole blood as it proceeds from fibrinogen through known stages of coagulation, culminating in the cross-linking of the fibrin clot which ultimately solidifies and dries at the end of a cycle, including the steps of:
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providing a measured sample of whole blood to be tested; transmitting infrared electromagnetic energy through the blood sample; detecting the transmission of the infrared energy and electronically producing the signals in response to said infrared energy; and measuring a peak transmission level of said infrared energy and calibrating said peak signal in terms of clotting time of said whole blood sample whereby the clotting time is represented by the peak transmission level of the infrared energy through the whole blood sample. - View Dependent Claims (2, 3, 4)
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5. An instrument for measuring and recording the clotting time of blood by measuring changes in the amplitude of an electromagetic energy transmission through the blood coinciding with changes in the composition of the blood as it proceeds from fibrinogen through known stages of coagulation culminating in the cross-linking of the fibrin clot which ultimately solidifies and dries at the end of a cycle represented by a peak amplitude of the electromagnetic energy transmission comprising:
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a measured sample to be tested; means for transmitting a source of infrared electromagnetic energy through said sample; detector means for measuring changes in amplitude of said infrared electromagnetic energy signal; circuit means for providing a signal representative of said changes in amplitude; and
,means for producing a signal calibrated in terms of coagulation time when peak infrared transmission is recorded. - View Dependent Claims (6, 7, 8, 9, 10)
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11. An instrument for measuring and recording clotting time of blood by measuring changes in amplitude of an infrared energy transmission through a blood sample coinciding with changes in the composition of the blood as it proceeds from fibrinogen through known stages of coagulation culminating in the cross-linking of a fibrin clot which ultimately solidifies and dries at the end of the cycle represented by a peak amplitude of the infrared energy transmission, comprising:
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means for holding a measured sample to be tested; means for transmitting a source of infrared electromagnetic energy through the sample; detector means for measuring changes in amplitude of said infrared electromagnetic energy signal; circuit means for providing a signal representative of said changes in amplitude; means for producing a signal calibrated in terms of coagulation time when peak infrared transmission is recorded; and a cylindrical channel extending from the exterior of the instrument to a point adjacent said sample holding means, said channel constructed to receive a cylindrical capillary delivery tube to precisely deposit and locate said sample to be tested on said sample holding means. - View Dependent Claims (12, 13)
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Specification