Method and apparatus for determining instantaneous inspired volume of a subject during ventilatory assistance
First Claim
1. A method for determining an instantaneous inspired volume of a subject during ventilatory assistance for use in a ventilator device comprising the steps of:
- determining a measure of respiratory airflow of the patient;
calculating an index equal to the fuzzy extent to which a leak is changing based at least in part on the measure of respiratory airflow; and
calculating instantaneous inspired volume as a function of both the measure of respiratory airflow and said index.
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Accused Products
Abstract
The apparatus provides for the determination of the instantaneous phase in the respiratory cycle, subject'"'"'s average respiration rate and the provision of ventilatory assistance. A microprocessor (16) receives an airflow signal from a pressure transducer (18) coupled to a port (17) at a mask (11). The microprocessor (16) controls a servo (19), that in turn controls the fan motor (20) and thus the pressure of air delivered by the blower (10). The blower (10) is coupled to a subject'"'"'s mask (ii) by a conduit (12). The invention seeks to address the following goals: while the subject is awake and making substantial efforts the delivered assistance should be closely matched in phase with the subject'"'"'s efforts; the machine should automatically adjust the degree of assistance to maintain at least a specified minimum ventilation without relying on the integrity of the subject'"'"'s chemoreflexes; and it should continue to work correctly in the presence of large leaks.
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Citations
20 Claims
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1. A method for determining an instantaneous inspired volume of a subject during ventilatory assistance for use in a ventilator device comprising the steps of:
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determining a measure of respiratory airflow of the patient; calculating an index equal to the fuzzy extent to which a leak is changing based at least in part on the measure of respiratory airflow; and calculating instantaneous inspired volume as a function of both the measure of respiratory airflow and said index. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for determining the instantaneous inspired volume of a subject during ventilatory assistance for use in a ventilator device comprising the steps of:
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determining a measure of airflow from the subject; calculating an index equal to the fuzzy extent to which the impedance of a leak is changing based at least in part on the measure of airflow; and calculating instantaneous inspired volume as a function of both the measure of airflow and said index. - View Dependent Claims (9)
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10. An apparatus for determining a calculation of instantaneous inspired volume of a subject comprising:
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a means for determining, an estimate of the patient'"'"'s respiratory airflow; and a means for calculating instantaneous inspired volume from said respiratory airflow; wherein the means for calculating instantaneous inspired volume from said respiratory airflow includes coded machine control instructions to calculate said instantaneous inspired volume as a function of both the respiratory airflow and an index equal to the fuzzy extent to which a leak is changing. - View Dependent Claims (11, 12)
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13. An apparatus for determining a calculation of an instantaneous inspired volume of a subject during pressure support assistance comprising:
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a mask; a blower to supply pressurized air to said mask; a servo-controller coupled to said blower; a transducer to generate a flow signal representing at least in part respiratory airflow; and a processor, coupled to said transducer and said servo-controller, with programmed instructions; wherein the instructions calculate instantaneous inspired volume as a function of both a measure of respiratory airflow from the flow signal and an index equal to the fuzzy extent to which a leak is changing. - View Dependent Claims (14, 15, 16)
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17. An apparatus for determining a calculation of an instantaneous inspired volume of a subject during pressure support assistance comprising:
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a mask; a blower to supply pressurized air to said mask; a servo-controller coupled to said blower; a transducer to generate a flow signal; and a processor, coupled to said transducer and said servo-controller, wherein the processor is configured and adapted for calculating instantaneous inspired volume as a function of both data from the flow signal and an index equal to the fuzzy extent to which a leak is changing. - View Dependent Claims (18, 19, 20)
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Specification