Adjustment of ventilator pressure-time profile to balance comfort and effectiveness
First Claim
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1. A method for controlling a pressure support servo ventilator comprising the steps of:
- supplying air to a patient'"'"'s airway at a pressure that varies during each respiratory cycle, the pressure being characterized by both a pressure modulation amplitude and an adjustable pressure waveform template with a profile, and automatically controlling both said pressure modulation amplitude and the profile of said adjustable pressure waveform template by an output of a servo-controller operated to servo-control patient ventilation to at least equal a target value.
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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
28 Claims
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1. A method for controlling a pressure support servo ventilator comprising the steps of:
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supplying air to a patient'"'"'s airway at a pressure that varies during each respiratory cycle, the pressure being characterized by both a pressure modulation amplitude and an adjustable pressure waveform template with a profile, and automatically controlling both said pressure modulation amplitude and the profile of said adjustable pressure waveform template by an output of a servo-controller operated to servo-control patient ventilation to at least equal a target value. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling a pressure support ventilator comprising the steps of:
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supplying air to a patient'"'"'s airway at a pressure that varies during each respiratory cycle, the pressure being characterized by both a pressure modulation amplitude and a pressure waveform template of adjustable shape, deriving a measure of instantaneous patient ventilation, and automatically controlling both said pressure modulation amplitude and the shape of said pressure waveform template in accordance with said measure of instantaneous patient ventilation. - View Dependent Claims (7, 8, 9, 10)
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- 11. A pressure support ventilator comprising a supply of air for a patient'"'"'s airway where a pressure of the supply of air varies during each respiratory cycle, the pressure being characterized by both a pressure modulation amplitude and an adjustable pressure waveform template with a profile, means for deriving a measure of instantaneous patient ventilation, and means for automatically controlling both said pressure modulation amplitude and said profile of said adjustable pressure waveform template in accordance with said measure of instantaneous patient ventilation.
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16. A method for providing positive pressure ventilation comprising the steps of:
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supplying a patient with breathable gas at a pressure which is a function of at least a measure of phase in a respiratory cycle, an amplitude, and a smoothness parameter;
determining a measure of ventilation of the patient; and
automatically adjusting said smoothness parameter within a preset range to servo-control said measure of ventilation to at least equal a target ventilation. - View Dependent Claims (17, 18, 19)
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- 20. A pressure support ventilator comprising a supply of air for a patient'"'"'s airway wherein a pressure of the supply of air is a function of at least a measure of phase in a respiratory cycle of the patient, an amplitude, and a smoothness parameter, wherein said smoothness parameter is a calculated function of a target ventilation, wherein, said amplitude is adjusted within a preset range to servo-control said ventilation to at least equal a target ventilation.
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23. A method for controlling a degree of ventilatory support supplied to a patient by a pressure support ventilator, the method comprising the steps of
supplying breathable gas to a patient'"'"'s airway by a pressure waveform having an adjustable amplitude and an adjustable squareness; -
continuously determining a minute ventilation of the patient;
comparing the minute ventilation to a target ventilation;
If the minute ventilation is below the target ventilation, then first changing the adjustable amplitude to increase minute ventilation; and
if after increasing the minute ventilation it remains below the target ventilation, then making the waveform progressively more square. - View Dependent Claims (24, 25, 26, 27)
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28. A method of providing ventilatory support to a patient comprising the steps of:
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supplying breathable gas to a patient'"'"'s airway with a pressure waveform which has an adjustable squareness;
continuously determining minute ventilation;
comparing the minute ventilation to a target ventilation;
determining the presence of leak;
determining whether the leak is large; and
If the minute ventilation is below the target ventilation and the leak is large then gradually making the pressure waveform more square.
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Specification