Adjustment of ventilator pressure-time profile to balance comfort and effectiveness
First Claim
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1. A method of controlling a pressure support ventilator comprising:
- 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,generating data from a flow sensor,determining adequacy of ventilation of the patient from the data generated from the flow sensor, andautomatically calculating a change to the amplitude of said pressure waveform template in accordance with the determined adequacy of ventilation and automatically calculating a change to a shape function of said pressure waveform template in accordance with the determined adequacy of ventilation, wherein said changes produce a decrease in ventilatory support and an increase in comfort when the ventilatory support exceeds that required by the patient,and wherein said change to the shape function of said pressure waveform template produces a pressure change between a more square profile and a less square profile.
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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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4 Claims
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1. A method of controlling a pressure support ventilator comprising:
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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, generating data from a flow sensor, determining adequacy of ventilation of the patient from the data generated from the flow sensor, and automatically calculating a change to the amplitude of said pressure waveform template in accordance with the determined adequacy of ventilation and automatically calculating a change to a shape function of said pressure waveform template in accordance with the determined adequacy of ventilation, wherein said changes produce a decrease in ventilatory support and an increase in comfort when the ventilatory support exceeds that required by the patient, and wherein said change to the shape function of said pressure waveform template produces a pressure change between a more square profile and a less square profile. - View Dependent Claims (2, 3, 4)
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Specification