Vital signs monitor pumping system
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United States of America Patent
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Sep 25, 1990
Grant Date -
N/A
app pub date -
Oct 5, 1988
filing date -
Oct 5, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pump supplies a variable pressure to an occluding cuff of a blood pressure monitor. This pump includes a pumping member that is driven through a stroke in response to a drive signal having a fixed frequency but a variable duty cycle such that the length of the stroke is variable in response to variations in the duty cycle. The drive signal is generated at a selected driving frequency which is outside of and greater than the measuring frequency range of the blood pressure monitor. In this way, strokes of the pump do not cause pressure variations in the cuff within the measuring frequency range.
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