Control of supplied pressure in assisted ventilation
First Claim
1. A method for controlling operation of an assisted ventilation device supplying pressurized gas to a patient, the method comprising the steps of:
- determining an average of pressure of gas supplied to said patient; and
controlling the pressure supplied by said ventilation device with regard to said average, wherein, said controlling step includes a condition that the average exceeds a threshold for more than a minimum period of time before a potential or actual overpressure is determined as occurring.
3 Assignments
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Accused Products
Abstract
Methods and apparatus for detecting the occurrence of a potential or actual overpressure during assisted ventilation are described. A blower (10) supplies pressurized gas to a conduit (12), and in turn to a patient mask (11) for connection with the entrance of a patient'"'"'s airways. A pressure sensor (17, 18) detects the delivered pressure in the mask (11), which is provided to a controller (16). The controller (16) has operation over the blower (10) by way of a servo (19) and motor (20). The controller (16) determines a relatively longterm average of the pressure signal, and compares it against a threshold value (40). If the threshold value is approached or exceeded, the controller (16) controls the blower (10) and thus the supplied pressure to the patient. The effect of the control can be to limit or reduce the supplied gas pressure. The relatively longterm average can be of the order of minutes, or taken over ten or more breaths.
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Citations
19 Claims
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1. A method for controlling operation of an assisted ventilation device supplying pressurized gas to a patient, the method comprising the steps of:
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determining an average of pressure of gas supplied to said patient; and
controlling the pressure supplied by said ventilation device with regard to said average, wherein, said controlling step includes a condition that the average exceeds a threshold for more than a minimum period of time before a potential or actual overpressure is determined as occurring. - View Dependent Claims (2, 3, 4, 5, 7, 8)
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6. A method for controlling operation of an assisted ventilation device supplying pressurized gas to a patient, the method comprising the steps of:
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measuring the currently delivered pressure;
determining an average of the measured pressure;
comparing said average against a threshold value; and
if the threshold value is approached or exceeded, controlling the pressure supplied by the device, wherein, for the case of said average exceeding said threshold, said controlling step includes a condition that said excess must occur for a minimum period of time before it is determined that a potential or actual overpressure is occurring.
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9. A method for controlling operation of an assisted ventilation device supplying pressurized gas to a patient, the method comprising the steps of:
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determining an average of supplied pressure; and
controlling said supplied pressure as a function of a waveform template, a target patient ventilation and said average, wherein said function is given by;
P=P0+k.A.f(v,t)where; P is said supplied pressure, P0 is a constant pressure, K is a function of said average, A is a function of said target patient ventilation, and f(v,t) represents said waveform template. - View Dependent Claims (10)
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11. Assisted ventilation apparatus for detecting a potential or actual overpressure condition, comprising:
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a blower to supply pressurized gas to a conduit, and in turn to a patient mask for connection with the entrance to a patient'"'"'s airways;
a pressure sensor to detect the delivered pressure of gas in the conduit or at the mask, and provide a signal thereof; and
a controller receiving said pressure signal and having control over operation of the blower and configured to determine an average of the pressure signal and to control the supplied pressure with regard to said average, wherein, said control of the supplied pressure includes a condition that the average exceeds a threshold for more than a minimum period of time before a potential or actual overpressure is determined as occurring. - View Dependent Claims (12)
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13. Assisted ventilation apparatus for detecting a potential or actual overpressure condition, comprising:
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a blower to supply pressurized gas to a conduit, and in turn to a patient mask for connection with the entrance to a patient'"'"'s airways;
a pressure sensor to detect the delivered pressure of gas in the conduit or at the mask, and provide a signal thereof; and
a controller, receiving the pressure signal and having control over operation of the blower, and configured to determine an average of the pressure signal, compare the average against a threshold value, and if the threshold value is approached or exceeded, to control the blower and thus the supplied pressure, wherein, the controller is further configured for determining a time that the average exceeds the threshold and conditioning the control of the blower on the time exceeding a minimum period. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification