Blood component measurement apparatus
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United States of America Patent
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Dec 7, 2004
Grant Date -
Jun 19, 2003
app pub date -
Nov 19, 2002
filing date -
Nov 20, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
In a pulse oximeter (blood component measurement apparatus), a subject body is irradiated periodically with red light and infrared light. Then, carried out sequentially in a time sharing manner are the measurement of the transmitted light intensity through the subject body, the measurement of the pulse wave component of the transmitted light intensity, and the measurement of the dark level in the state that the subject body is not irradiated with the light. On the basis of these measurement values, oxygen saturation of the arterial blood is measured. In the present embodiments, each measurement is carried out with a time interval equal to the period corresponding to the line frequency. In this approach, periodic noise of the line frequency or other noise are eliminated in dark level correction. This permits precise measurement of the blood component.
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