Proportional pressure assist ventilation controlled by a diaphragm electromyographic signal

摘要

A closed loop system uses (a) the intensity of the diaphragm electromyogram (EMG) for a given inspiratory volume ; (b) the inspiratory volume for a given EMG intensity ; or (c) a combination of (a) and (b) ; in view of controlling the level of gas flow, gas volume or gas pressure delivered by a mechanical (lung) ventilator. The closed loop ventilator system enables for automatic or manual adjustment of the level of inspiratory support in proportion to changes in the neuro-ventilatory efficiency such that the neural drive remains stable at a desired target level. Futhermore, a method and apparatus for substantially removing a common noise signal portion from electrical signals produced by an electrical signal source having a polarity reversal region with a centre, said electrical signals having inverse polarities on opposite sides of the centre.