Closed loop pressure determination system and method for fiber o

Details Closed loop pressure determination system and method for fiber o Closed loop pressure determination system and method for fiber o

1994-01-24

1996-05-21

Sykes, Angela D.

Surgery

Truss

Pad

128675, 128748, A61B 502

Patent

active

055179983

ABSTRACT:
A closed loop control system for a fiber optic pressure transducer and a method of operation for such a system are disclosed. A flexible, pressure sensitive membrane of the pressure transducer is pressure coupled on one surface to a pressure to be measured and on its opposite surface to a sealed passage within an optical fiber pathway connected to a control module. The pressure within the passage is adjusted by a pressure generator to compensate for changes in the pressure being measured, in response to an output signal from a comparator in the control module. That output signal is the result of a comparison between a predetermined reference pressure signal and a modulated light signal from the pressure transducer indicative of a change in the measured pressure. The adjusted pressure within the lumen passage is sensed to provide a pressure reading equivalent to the measured pressure, since the pressure in the lumen passage is adjusted to equalize the pressures on the opposite surfaces of the pressure sensitive membrane.

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Wald et al., "A new technique for monitoring epidural intracranial pressure," Medical Instrumentation, vol. 11, pp. 352-354, 1977.

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