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 ventilator comprising the steps of:
- 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, determining adequacy of ventilation of the patient, and automatically making a change to the shape of said pressure waveform template in accordance with said adequacy of ventilation, wherein said change produces an increase in ventilatory support at an expense of comfort when the ventilation is inadequate.
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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
36 Claims
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1. A method for 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, determining adequacy of ventilation of the patient, and automatically making a change to the shape of said pressure waveform template in accordance with said adequacy of ventilation, wherein said change produces an increase in ventilatory support at an expense of comfort when the ventilation is inadequate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling a patient 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 in accordance with an adjustable pressure waveform template having a shape, repeatedly determining from supplied airflow a determined adequacy of ventilation of the patient, and making changes to said adjustable pressure waveform template in a predetermined manner in accordance with the determined adequacy of ventilation, wherein the changes control an increase in ventilatory support at an expense of comfort when more support is required. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A pressure support ventilator comprising:
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supply means for delivering a controlled supply of breathable gas to a patient'"'"'s airway at a pressure;
determining means for determining adequacy of ventilation of the patient, and control means to (a) control said pressure to vary during each respiratory cycle in accordance with an adjustable pressure waveform template having a shape, and (b) automatically make a change to the shape of said pressure waveform template in accordance with said adequacy of ventilation, wherein said change produces an increase in ventilatory support at an expense of comfort when the ventilation is inadequate. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A pressure support ventilator comprising:
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a controllable blower, a mask and a conduit to supply air to a patient'"'"'s airway at a pressure;
a pressure transducer configured to produce an airflow signal representative of respiratory airflow of the patient;
a processor to send signals to control said blower and accept input from said pressure transducer, said processor with programmed instructions for controlling the steps of;
varying the pressure during a respiratory cycle of the patient in accordance with an adjustable pressure waveform template having a shape, repeatedly determining a determined adequacy of ventilation of the patient from said airflow signal, and making changes to said adjustable pressure waveform template in a predetermined manner in accordance with the determined adequacy of ventilation, wherein the changes control an increase in ventilatory support at an expense of comfort when more support is required. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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Specification