Device for measuring light absorption materials in blood
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United States of America Patent
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Sep 17, 2002
Grant Date -
N/A
app pub date -
Sep 13, 2000
filing date -
Sep 13, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A red light and an infrared light which are emitted from a light emitting portion 2 are transmitted through a fingertip 4 of a subject and are converted into electric signals by a light receiving portion 3. The respective signals are separated and amplified and are then sent to a CPU 8. In the CPU 8, the input signals are divided into D.C. components DC1 and DC2 and A.C. components AC1 and AC2, changes .DELTA.A1=(AC/DC) 1 and .DELTA.A2=(AC/DC)2 in an absorbance are calculated, high frequency components thereof are extracted, a mutual ratio .PSI. is calculated, and a noise removing waveform is calculated based thereon. Based on the noise removing waveform, a pulse wave is detected, a pulse rate is calculated, a display wave form is calculated and an oxygen saturation is calculated. These are displayed through a display unit 11.
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