Method and apparatus for calculating a coagulation characteristic of a sample of blood a blood fraction or a control
First Claim
1. A method for calculating a coagulation characteristic of a sample of blood, a blood fraction, or a control, the method comprising the steps of:
- generating an output signal indicative of coagulation of the sample;
sampling the output signal at a sampling rate for a predetermined time interval to provide a plurality of sampled signal values;
storing the sampled signal values;
determining an envelope from the stored signal values;
storing the envelope; and
calculating the coagulation characteristic from the stored envelope based on the maximum signal value.
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Abstract
A method for calculating a coagulation characteristic of a sample of blood, a blood fraction, or a control comprises generating an output signal indicative of coagulation of the sample, sampling the output signal at a sampling rate for a predetermined time to provide a plurality of sampled signal values, storing the sampled signal values, rectifying the stored sampled signal values to provide a plurality of envelope values, and storing the envelope values. The stored envelope values are examined in reverse time order to determine a slope of the envelope at each of the stored envelope values. All relative maxima in the stored envelope values are identified. A range of stored envelope values corresponding to each relative maximum is determined. The identified relative maxima are compared to locate an absolute maximum in the stored envelope values. The coagulation characteristic is then calculated from the stored envelope values within the predetermined range of envelope values corresponding to the absolute maximum.
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Citations
53 Claims
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1. A method for calculating a coagulation characteristic of a sample of blood, a blood fraction, or a control, the method comprising the steps of:
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generating an output signal indicative of coagulation of the sample; sampling the output signal at a sampling rate for a predetermined time interval to provide a plurality of sampled signal values; storing the sampled signal values; determining an envelope from the stored signal values; storing the envelope; and calculating the coagulation characteristic from the stored envelope based on the maximum signal value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for calculating a coagulation characteristic of a sample of blood, a blood fraction, or a control, the method comprising the steps of:
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generating an output signal indicative of coagulation of the sample; sampling the output signal at a sampling rate for a predetermined time interval to provide a plurality of sampled signal values; storing the sampled signal values; determining an envelope from the stored signal values; storing the envelope; and calculating the coagulation characteristic from the stored envelope by locating a maximum value of the stored envelope; and
identifying a stored value in the envelope which is a predetermined percentage less than said maximum value, said coagulation characteristic being related to the number of stored samples between the beginning of the sampling interval and the thus-identified stored value. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A method for calculating a coagulation characteristic of a sample of blood, a blood fraction, or a control, the method comprising the steps of:
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generating an output signal indicative of coagulation of the sample; sampling the output signal at a sampling rate for a predetermined time interval to provide a plurality of sampled signal values; storing the sampled signal values; rectifying the stored sampled signal values to provide a plurality of envelope values; storing the envelope values; examining the stored envelope values in reverse time order to determine a slope of the envelope at each of the stored envelope values; identifying all relative maxima in the stored envelope values and determining a range of stored envelope values corresponding to each relative maximum; comparing the identified relative maxima to locate an absolute maximum in the stored envelope values; and calculating the coagulation characteristic from the stored envelope values within the determined range of envelope values corresponding to the absolute maximum. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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- 33. An apparatus for calculating a coagulation characteristic of a sample of blood, a blood fraction, or a control, the apparatus comprising means for generating an output signal indicative of coagulation of the sample, and means for sampling the output signal at a sampling rate for a predetermined time interval to provide a plurality of sampled signal values, for storing the sampled signal values, for determining an envelope from the stored signal values, for storing the envelope, and for calculating the coagulation characteristic from the stored envelope based on the maximum signal value.
- 41. An apparatus for calculating a coagulation characteristic of a sample of blood, a blood fraction, or a control, the apparatus comprising means for generating an output signal indicative of coagulation of the sample, means for sampling the output signal at a sampling rate for a predetermined time interval to provide a plurality of sampled signal values, for storing the sampled signal values, for determining an envelope from the stored signal values, for storing the envelope, for calculating the coagulation characteristic from the stored envelope by identifying a maximum value from the stored envelope and for identifying a stored envelope value which is a predetermined percentage less than said maximum value, said coagulation characteristic being related to the number of stored samples between the beginning of the sampling interval and the thus-identified stored envelope value.
- 47. An apparatus for calculating a coagulation characteristic of a sample of blood, a blood fraction, or a control, the apparatus comprising means for generating an output signal indicative of coagulation of the sample, means for sampling the output signal at a sampling rate for a predetermined time interval to provide a plurality of sampled signal values, for storing the sampled signal values, for rectifying the stored sampled signal values to provide a plurality of envelope values, for storing the envelope values, for examining the stored envelope values in reverse time order to determine a slope of the envelope at each of the stored envelope values, for identifying all relative maxima in the stored envelope values, for determining a range of stored envelope values corresponding to each relative maximum, for comparing the identified relative maxima to each other to locate an absolute maximum in the stored envelope values, and for calculating the coagulation characteristic from the stored signal values within the determined range of envelope values corresponding to the absolute maximum.
Specification