Apparatus for assisting in ventilating the lungs of a patient
First Claim
1. An apparatus for assisting in ventilating the lungs of a patient comprising:
- a respiratory gas source means for supplying the respiratory gas to a patient;
a breathing mask means for introducing the respiratory gas into the lungs of a patient, the breathing mask being suitable to be put on the face of a patient;
a conduit means for fluidly connecting the respiratory gas source means to the breathing mask for delivering the respiratory gas from the respiratory gas source means to the breathing mask;
a means for regulating the pressure within the conduit means;
a flow meter means for detecting the flow rate of the respiratory gas from the respiratory gas source to the breathing mask;
a pressure sensor means for detecting the pressure within the conduit adjacent to the breathing mask;
a means for obtaining a flow impedance parameter of the flow system downstream of the pressure sensing means, including the airways and the lungs of the patient, based on the flow rate and pressure detected by the flow meter and the pressure sensor means;
a means for storing the relationship between the operation of the pressure regulating means, the flow impedance parameter, and the pressure within the conduit means;
a means for predicting the flow impedance parameter after a predetermined time interval within a respiratory cycle;
a means for generating a target pressure signal to which the pressure regulating means regulates the pressure within the conduit; and
a means for controlling the operation of the pressure regulating means such that the pressure within the conduit adjacent to the breathing mask becomes substantially the target pressure during the respiratory cycle based on the predicted flow impedance parameter and the relationship between the operation of the pressure regulating means, the flow impedance parameter, and the pressure within the conduit means.
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Accused Products
Abstract
An apparatus for assisting in ventilating the lungs of a patient comprises a respiratory gas source means; a breathing mask means; a conduit means for fluidly connecting the respiratory gas source means to the mask; a means fop regulating the pressure within the conduit means; a flow meter means for detecting the flow rate of the respiratory gas; and a pressure sensor means for detecting the pressure within the conduit adjacent to the breathing mask. The apparatus further comprises a means for calculating the flow impedance parameter of the flow system downstream the pressure sensing means; a means for storing the relationship between the operation of the pressure regulating means, the flow impedance parameter, and the pressure within the conduit means; a means for predicting the flow impedance parameter after a predetermined time interval; and a means for generating a target pressure to which the pressure regulating means regulates the pressure within the conduit. The pressure regulating means is controlled such that the pressure within the conduit adjacent to the breathing mask is substantially the target pressure based on the predicted flow impedance parameter and the data.
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Citations
21 Claims
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1. An apparatus for assisting in ventilating the lungs of a patient comprising:
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a respiratory gas source means for supplying the respiratory gas to a patient; a breathing mask means for introducing the respiratory gas into the lungs of a patient, the breathing mask being suitable to be put on the face of a patient; a conduit means for fluidly connecting the respiratory gas source means to the breathing mask for delivering the respiratory gas from the respiratory gas source means to the breathing mask; a means for regulating the pressure within the conduit means; a flow meter means for detecting the flow rate of the respiratory gas from the respiratory gas source to the breathing mask; a pressure sensor means for detecting the pressure within the conduit adjacent to the breathing mask; a means for obtaining a flow impedance parameter of the flow system downstream of the pressure sensing means, including the airways and the lungs of the patient, based on the flow rate and pressure detected by the flow meter and the pressure sensor means; a means for storing the relationship between the operation of the pressure regulating means, the flow impedance parameter, and the pressure within the conduit means; a means for predicting the flow impedance parameter after a predetermined time interval within a respiratory cycle; a means for generating a target pressure signal to which the pressure regulating means regulates the pressure within the conduit; and a means for controlling the operation of the pressure regulating means such that the pressure within the conduit adjacent to the breathing mask becomes substantially the target pressure during the respiratory cycle based on the predicted flow impedance parameter and the relationship between the operation of the pressure regulating means, the flow impedance parameter, and the pressure within the conduit means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for assisting in ventilating the lungs of a patient comprising:
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a respiratory gas source means for supplying the respiratory gas to a patient; a breathing mask means for introducing the respiratory gas into the lungs of a patient, the breathing mask being suitable to be put on the face of a patient; a conduit means for fluidly connecting the respiratory gas source means to the breathing mask for delivering the respiratory gas from the respiratory gas source means to the breathing mask; a means for regulating the pressure within the conduit means; an expiratory valve means for exhausting the expiratory gas from the patient, the expiratory valve means being provided in the conduit means downstream of the pressure regulating means; a flow meter means for detecting the flow rate of the respiratory gas from the respiratory gas source to the breathing mask; a pressure sensor means for detecting the pressure within the conduit adjacent to the breathing mask; a means for determining whether the respiration is the expiration phase or in the inspiration phase; a means for obtaining a flow impedance parameter of the flow system downstream of the pressure sensing means including the airways and the lungs of a patient based on the flow rate and pressure detected by the flow meter and the pressure sensor means; the flow impedance parameter being defined by the following equation;
##EQU8## where α
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flow impedance parameterP;
pressure within the conduitQ;
flow rate of the respiratory gasa means for storing the relationship between the operation of the pressure regulating means, the flow impedance parameter, and the pressure within the conduit means; a means for predicting the flow impedance parameter after a predetermined time interval; a means for generating a target pressure signal to which the pressure regulating means regulates the pressure within the conduit; and a means for controlling the operation of the pressure regulating means such that the pressure within the conduit adjacent to the breathing mask becomes substantially the target pressure based on the predicted flow impedance parameter and the relationship between the operation of the pressure regulating means, the flow impedance parameter, and the pressure within the conduit means. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification