Method and apparatus for "zeroing" and calibrating a catheter-tip gauge-pressure transducer
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jun 16, 1987
Grant Date -
N/A
app pub date -
Jun 14, 1985
filing date -
Jun 14, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Sensitivity or span calibration is adjusted to a desired value by (1) noting the display indication with the reference side of the transducer at atmospheric pressure, (2) substituting a known offset pressure for atmospheric pressure on the reference side, to produce a new display indication, and (3) adjusting the display to produce that amount of displacement (between the display indications in steps 1 and 2) which corresponds to the known offset pressure multiplied by the desired calibration value. With the sensitivity or span calibration adjusted to a desired value, the zero point of the display is adjusted by (1) independently measuring the mean of the actual pressure, (2) noting the mean value of the display indication, and (3) adjusting the zero point to eliminate discrepancy between the mean value of the display and the mean of the actual pressure. The apparatus has a port for a substitute reference pressure, and an external pressure gauge for measuring the mean pressure through an auxiliary lumen of the catheter.
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