Method and apparatus for controlling an artificial respirator
DCFirst Claim
1. In a respirator for varying tidal volume and frequency of breaths of a patient, an apparatus for automatically controlling the respirator comprising:
- first means for processing data representing at least air viscosity factor in lungs of the patient, barometric pressure, lung elastance factor of the patient and measured levels of carbon dioxide and oxygen levels of the patient, and for providing, based upon said data, digital output data indicative of required ventilation and optimum frequency for a next breath of the patient;
second means operatively coupled to the first means for converting the digital output data to analog data; and
,third means operatively coupled to the second means and to the respirator for converting the analog data to timing and control signals and supplying the timing and control signals to the respirator, the timing and control signals automatically and variably controlling the tidal volume and frequency of inhaled gas provided to the patient by the respirator based upon actual ventilation and breathing frequency requirements of the patient as determined by the first means.
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Abstract
An apparatus for automatically controlling an artificial respirator includes sensors for receiving the exhaust gas from a patient and providing data signals corresponding to the concentration of the carbon dioxide and oxygen in the gas. The data signals are provided to a microcomputer which, together with data representing at least the patient'"'"'s lung elastance factor, air viscosity factor in the lungs and barometric pressure, and when the patient is in exercise, metabolic rate ratio, determines the total ventilation and frequency for the patient'"'"'s next breath and provides data output signals corresponding thereto. The data output signals from the microcomputer are provided, in analog form, to a signal generator and timing control circuit. This circuit provides output pulses which control the respirator and control valves between the respirator and the sensors.
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Citations
27 Claims
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1. In a respirator for varying tidal volume and frequency of breaths of a patient, an apparatus for automatically controlling the respirator comprising:
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first means for processing data representing at least air viscosity factor in lungs of the patient, barometric pressure, lung elastance factor of the patient and measured levels of carbon dioxide and oxygen levels of the patient, and for providing, based upon said data, digital output data indicative of required ventilation and optimum frequency for a next breath of the patient; second means operatively coupled to the first means for converting the digital output data to analog data; and
,third means operatively coupled to the second means and to the respirator for converting the analog data to timing and control signals and supplying the timing and control signals to the respirator, the timing and control signals automatically and variably controlling the tidal volume and frequency of inhaled gas provided to the patient by the respirator based upon actual ventilation and breathing frequency requirements of the patient as determined by the first means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. In a respirator for varying tidal volume and frequency of breaths of a patient, a method of automatically controlling the respirator comprising the steps of:
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(a) measuring levels of carbon dioxide and oxygen of the patient and providing a first pair of data signals indicative of the same; (b) providing data indicative of at least the patient'"'"'s lung elastance factor, air viscosity factor in the lungs and barometric pressure; (c) determining from said first pair of data signals and from the data provided in step (b) the required ventilation and breathing frequency for a next breath of the patient and providing a second pair of data signals indicative of the same; and
,(d) providing, based upon said second pair of data signals, final data signals for automatically and variably controlling the ventilation and breathing frequency of the respirator based upon actual ventilation and breathing frequency requirements of the patient as determined in step (c). - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification