Surgery – Truss – Pad
Patent
1989-05-12
1991-08-20
Cohen, Lee S.
Surgery
Truss
Pad
128665, A61B 502
Patent
active
050405390
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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Schmitt Joseph M.
Walker Elijah C.
Webber Richard L.
Cohen Lee S.
The United States of America
Zele John D.
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