ADJUSTMENT OF VENTILATOR PRESSURE-TIME PROFILE TO BALANCE COMFORT AND EFFECTIVENESS
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Abstract
The invention is a ventilator whose servo-controller adjusts the degree of support by adjusting the profile of the pressure waveform as well as the pressure modulation amplitude. As the servo-controller increases the degree of support by increasing the pressure modulation amplitude, it also generates a progressively more square, and therefore efficient, pressure waveform; when the servo-controller decreases the degree of support by decreasing the pressure modulation amplitude, it also generates a progressively more smooth and therefore comfortable pressure waveform.
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Citations
60 Claims
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1-56. -56. (canceled)
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57. A method of controlling a pressure support ventilator comprising the steps of:
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supplying breathable gas to a patient'"'"'s airway at a pressure that varies during each respiratory cycle in accordance with an adjustable pressure waveform template having a shape and a variable amplitude, determining adequacy of ventilation of the patient, and automatically making a change to the amplitude and shape of said pressure waveform template in accordance with the determined adequacy of ventilation, wherein said change produces a decrease in ventilatory support and an increase in comfort when the ventilatory support exceeds that required by the patient, and wherein said pressure waveform template has both its inspiratory and expiratory parts defined by a single smoothness parameter whose value is automatically varied in accordance with the adequacy of patient ventilation. - View Dependent Claims (58, 59, 60)
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Specification