Chemistry: analytical and immunological testing – Hemoglobin – myoglobin – or occult blood
Reexamination Certificate
2005-09-27
2005-09-27
Wallenhorst, Maureen M. (Department: 1743)
Chemistry: analytical and immunological testing
Hemoglobin, myoglobin, or occult blood
C436S164000, C436S171000, C356S039000, C356S040000, C600S328000, C702S019000, C702S027000, C702S028000, C702S032000
Reexamination Certificate
active
06949384
ABSTRACT:
The present invention provides a method for monitoring degradation of Hb-based blood substitutes, in a sample. This method involves determining a concentration of met-Hb within the sample, by applying a calibration algorithm for met-Hb to an absorbance obtained from the sample at one or more than one wavelengths, and using the concentration of met-Hb, as a measurement of degradation of the Hb-based blood substitutes. Using this assay, a concentration of met-Hb that is equal to or greater than 3% may be used as an indicator of degradation of Hb. Alternatively, by obtaining samples over a period of time, the concentration of met-Hb and the concentration of Hb-based blood substitute may be determined in each of these samples, and an increase in the concentration of met-Hb over the period of time is an indicator of degradation of Hb. The sample may be a whole blood sample, a serum sample, or a plasma sample obtained from a patient transfused with one or more than one Hb-based blood substitutes, a stock Hb-based blood substitute sample, or a body part of a patient.
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Muchin Katten
Rosenman Zavis
Spectromedical Inc.
Wallenhorst Maureen M.
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