Surgery – Truss – Pad
Patent
1993-12-30
1995-08-01
Chilcot, Jr., Richard E.
Surgery
Truss
Pad
73 4R, A61B 500
Patent
active
054372844
ABSTRACT:
Calibration apparatus and method for calibrating a movable pressure sensor include the use of a stop device to establish a reference position outside the sensing movement range of a first sensor. While in vitro, a reference pressure is established by applying pressure to the sensor to move it against the stop surface with a controllable pressure source. This reference pressure is stored. During use when the sensor is in an unknown position, such as when in vivo, the controllable pressure source applies pressure to move the sensor against the stop surface and the pressure required to do so is measured. The measured pressure is compared to the reference pressure to determine the unknown pressure and the system is then recalibrated. An optical system may be used as a second sensor to determine the position of the first sensor. Inner and outer housings in which the first sensor and stop surface are mounted are moved in relation to each other and the optical sensor during assembly of the calibration system to accurately and independently calibrate the first and optical sensors.
REFERENCES:
patent: 4446715 (1984-05-01), Bailey
patent: 4712566 (1987-12-01), Hok
patent: 4815513 (1989-03-01), Beard
patent: 5065010 (1991-11-01), Knute
patent: 5203340 (1993-04-01), Gustafson et al.
patent: 5247171 (1993-09-01), Wlodarczyk et al.
Sensors May 1992, pp. 31-33 "A Disposable BP Transducer for in Vivo Pressure Measurements".
Camino Laboratories, Inc.
Chilcot Jr. Richard E.
Noori Max H.
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