Surgery – Diagnostic testing – Cardiovascular
Patent
1998-02-26
1999-12-21
O'Connor, Cary
Surgery
Diagnostic testing
Cardiovascular
600481, A61N 500
Patent
active
060042745
ABSTRACT:
Continuous, non-invasive method and apparatus for measuring blood pressure parameters and the like are disclosed. One disclosed apparatus includes an earpiece for sealing an individual's ear canal so that arterial blood pressure changes adjacent the sealed ear canal produce air pressure changes in the sealed ear canal. The apparatus further includes pressure sensing means for measuring the air pressure changes in the sealed ear canal and producing a signal related to the measured air pressure changes. In addition, the apparatus preferably includes processing means for processing the signal to measure blood pressure parameters, as well as means for displaying and/or recording the processed signal. The method may be used to determine heart rate, blood pressure, cardiac output, stroke volume, cardiac function, circulatory function, and other parameters. To obtain absolute pressure readings, two sensors, one in each ear, may be used to monitor pulse time transit delay.
REFERENCES:
patent: 4928692 (1990-05-01), Goodman et al.
patent: 5213099 (1993-05-01), Tripp
patent: 5632272 (1997-05-01), Diab et al.
patent: 5673692 (1997-10-01), Schulze et al.
Moody Trevor J.
Nolan James A.
Astorino Michael
O'Connor Cary
Smith, P.C. Brian D.
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