Pulse oximeter for diagnosis of dental pulp pathology
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United States of America Patent
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-
Aug 20, 1991
Grant Date -
N/A
app pub date -
May 12, 1989
filing date -
May 12, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A non-invasive device which determines the pulp oxygenation level of a tooth and the vitality of a tooth using multiple-wavelength optical plethysmography. A sensor is shaped to be mounted on a tooth and circuitry for processing a signal from the sensor and supplied from a photosenstive diode is used. The photosensitive diode in the sensor detects light scattered from the tooth which was emitted from red, green, and infrared LEDs. An electrocardiogram (ECG) monitor is provided so as to produce improved detection reliability by synchronous averaging using the occurrence of the R-wave of the ECG as a time marker. Using this approach, a threshold-of-detection criterion can be established based on an average computed over a period to achieve a desired signal-to-noise ratio.
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Family
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Cited Art Landscape
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