Automatic indirect non-invasive apparatus and method for determining diastolic blood pressure by calibrating an oscillation waveform
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United States of America Patent
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Feb 11, 2003
Grant Date -
N/A
app pub date -
Sep 10, 2001
filing date -
Sep 10, 2001
priority date (Note) -
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Abstract
Blood pressure of an human being is read by a process that places a cuff around a portion of the human being's body. The cuff is inflated to a predefined pressure which occludes the flow of blood and then the cuff is deflated in a controlled manner. At a plurality of deflation pressure levels, pressure oscillations that occur in the cuff are measured to produce a series of measurements representing the waveform of the oscillations. The systolic pressure and mean arterial pressure are derived from the measurements in conventional manners. A portion of the waveform for one cardiac cycle is analyzed by locating points which correspond to the occurrence of the systolic and mean arterial pressures. The diastolic pressure, which occurs at the minimum point of the waveform, is derived from those points and the systolic and mean arterial pressures.
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