Portable pulse oximeter
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United States of America Patent
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Nov 19, 1996
Grant Date -
N/A
app pub date -
Apr 1, 1994
filing date -
Apr 1, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A diagnostic instrument for determining a cardiovascular system parameter. In one embodiment, the instrument takes the form of a portable pulse oximeter comprising a light to frequency converter (LFC) as a sensor. Also provided is a light to frequency converter comprising a photoresistor and capacitor in circuit communication with an inverting Schmitt trigger and configured such that the inverter generates a periodic electrical signal corresponding to the amount of electromagnetic radiation illuminating the photoresistor.
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Family
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