Apparatus and method for adapting a piezoelectric respiratory sensing belt to a respiratory inductance plethysmography polysomnograph
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United States of America Patent
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Aug 8, 2017
Grant Date -
Nov 6, 2014
app pub date -
May 2, 2014
filing date -
May 3, 2013
priority date (Note) -
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Abstract
Circuits for rendering piezo-based respiratory belts compatible with polysomnograph (PSG) machines designed for use with respiratory induction belts (RIPs) comprise an instrumentation amplifier adapted to be connected to a piezoelectric transducer and providing an AC output signal to a low-pass filter. In a first embodiment, the low-pass filter output is applied to an input of a microcontroller's A to D converter and the resulting digitized samples are used to vary the resistance of a digital potentiometer whose wiper terminal is coupled in series with an inductor so as to emulate the presence of a RIP belt to the PSG machine. In a second embodiment, the low-pass filter output is used to drive the primary of a transformer so as to vary the permeability of the transformer's ferrite core in a way that emulates the performance of a RIP belt to the PSG.
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