Method for compensating a pressure drop in a ventilator tube, ventilator and memory medium
First Claim
1. A method of compensating for a pressure drop in a ventilator tube associated with a respiratory mask having a selected mask pressure, comprising:
- measuring a first air flow at a first pressure on a ventilator side of a ventilator tube and with the respiratory mask taken off;
calculating a first parameter in a function providing the pressure drop in said ventilator tube in dependence on air flow;
measuring a second air flow with the respiratory mask being put on;
calculating a correction pressure by means of the function for the measured first and second air flows; and
setting a target pressure determined as sum of the selected mask pressure and the correction pressure.
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Accused Products
Abstract
The present invention relates to a method of compensating the pressure drop in an ordinary ventilator tube. The method comprises the measurement of a first air flow at a first pressure on the apparatus'"'"' side of the ventilator tube and with the respiratory mask taken off. Moreover, a parameter is calculated in a function which provides the pressure drop in the ventilator tube in dependence on the air flow. The parameter for the air flow and pressure is calculated. Later, the air flow is calculated with the respiratory mask being put on. By means of the function a correction pressure is calculated from the air flow. Finally, a target pressure is set which results as a sum of the selected mask pressure and the correction pressure. The invention moreover relates to ventilator for performing the aforementioned method and to a memory medium for storing a corresponding program.
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Citations
16 Claims
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1. A method of compensating for a pressure drop in a ventilator tube associated with a respiratory mask having a selected mask pressure, comprising:
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measuring a first air flow at a first pressure on a ventilator side of a ventilator tube and with the respiratory mask taken off; calculating a first parameter in a function providing the pressure drop in said ventilator tube in dependence on air flow; measuring a second air flow with the respiratory mask being put on; calculating a correction pressure by means of the function for the measured first and second air flows; and setting a target pressure determined as sum of the selected mask pressure and the correction pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A ventilator, comprising:
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a housing; a fan within said housing; a respiratory mask having a selected mask pressure; a ventilator tube having a ventilator side, said ventilator tube connecting said fan and said respiratory mask; a flow sensor for measuring a first air flow at a first pressure on the ventilator side of said ventilator tube while the respiratory mask being taken off; a controller for calculating a first parameter in a function providing a pressure drop in said ventilator tube in dependence on air flow; said flow sensor also for measuring a second air flow while the respiratory mask being put on; said controller calculating a correction pressure by means of the function for the measured first and second air flows; and said controller setting a target pressure determined as sum of the selected mask pressure and the correction pressure. - View Dependent Claims (12, 13, 14, 15)
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16. A memory medium for use with a CPAP-apparatus associated with a respiratory mask having a selected mask pressure and comprising a central processing unit for processing the commands stored in the memory medium, the CPAP-apparatus performing the following steps during the processing of the commands stored in the memory medium:
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measuring a first air flow at a first pressure on a ventilator side of a ventilator tube and with the respiratory mask taken off; calculating a parameter in a function providing the pressure drop in said ventilator tube in dependence on the air flow; measuring the air flow with the respiratory mask being put on; calculating a correction pressure by means of the function for the measured air flow; and setting a target pressure determined as sum of the selected mask pressure and the correction pressure.
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Specification