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US 3,993,995 AGranted
Respiration monitor
AssigneeRCA Corporation
InventorsGerald Stanley Kaplan, Alvin Seymour Clorfeine
Life of this patent
Estimating the term…
Abstract
An apparatus for automatically monitoring the respiration of a subject requiring no physical connection to the subject. The use of such apparatus for automatically triggering an x-ray machine at instants of respiration extrema is also disclosed.
Claims5
Apparatus for monitoring the respiration of a subject comprising:
- first means for generating a probe signal and transmitting said probe signal to illuminate a body portion of said subject, a portion of said probe signal being reflected from said body portion;
- second means for receiving said reflected signal and generating an output signal indicative thereof;
- third means, responsive to a signal indicative of said probe signal and said second means output signal, for generating first and second output signals respectively indicative of the cosine and sine of the phase difference between said probe signal and said reflected signal;
- and
- fourth means, responsive to said third means first and second output signals, for deriving the time derivatives of said third means first and second output signals and generating an output signal only when said derivatives are concurrently substantially zero, whereby said fourth means output signal is indicative of instants of respiration extrema.
2 more elements
Dependencies are inferred from the claim text.