Pressure-controlled breathing aid
First Claim
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1. A pressure mode breathing aid device, comprising:
- means for detecting the breathing activity of a patient and for generating, as a function of that activity, inspiration and expiration phases synchronized with said activity, means for supplying breathable gas, during the inspiration phases, to an inspiratory branch of a patient circuit at an inspiratory pressure adjusted in relation to a pressure command,means for measuring the breathed volume,means for comparing the breathed volume with a volume command, andregulating means for increasing the inspiratory pressure command in the case of a breathed volume lower than the volume command, and for reducing the inspiratory pressure command in the case of a breathed volume higher than the volume command.
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Abstract
The ventilation module (8) regulates the inspiratory pressure (P) according to an inspiratory pressure order (AI). A control module (9) compares the breathed volume at each cycle (VTI) with a minimum volume order (VTImini) and varies the pressure order (AI) in the direction tending to maintain the breathed volume (VTI) just over the minimum (VTImini), but keeping the pressure order (AI) within an interval comprised between the two extreme values (AImini, AImaxi). Utilization to combine the advantages of the pressure mode ventilation with those of the volumetric ventilation.
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Citations
15 Claims
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1. A pressure mode breathing aid device, comprising:
- means for detecting the breathing activity of a patient and for generating, as a function of that activity, inspiration and expiration phases synchronized with said activity, means for supplying breathable gas, during the inspiration phases, to an inspiratory branch of a patient circuit at an inspiratory pressure adjusted in relation to a pressure command,
means for measuring the breathed volume, means for comparing the breathed volume with a volume command, and regulating means for increasing the inspiratory pressure command in the case of a breathed volume lower than the volume command, and for reducing the inspiratory pressure command in the case of a breathed volume higher than the volume command. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- means for detecting the breathing activity of a patient and for generating, as a function of that activity, inspiration and expiration phases synchronized with said activity, means for supplying breathable gas, during the inspiration phases, to an inspiratory branch of a patient circuit at an inspiratory pressure adjusted in relation to a pressure command,
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13. A pressure mode breathing aid device, comprising:
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means for detecting the breathing activity of a patient and for generating, as a function of that activity, inspiration and expiration phases synchronized with the activity; means for supplying breathable gas, during the inspiration phases, to an inspiratory branch of a patient circuit at an inspiratory pressure adjusted in relation to a pressure command; means for measuring the breathed volume; means for comparing the breathed volume with a volume command; and regulating means for increasing the inspiratory pressure command in the case of a breathed volume lower than the volume command, and for reducing the inspiratory pressure command in the case of a breathed volume higher than the volume command, wherein in at least certain of the breathed volume cases below and above the volume command, said regulating means applies a pressure variation to the inspiratory pressure which increases with the difference between the measured breathed volume and the volume command, the pressure variation being equal in percentage to the difference between the measured breathed volume and the volume command.
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14. A pressure mode breathing aid device, comprising:
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means for detecting the breathing activity of a patient and for generating, as a function of that activity, inspiration and expiration phases synchronized with said activity, means for supplying breathable gas, during the inspiration phases, to an inspiratory branch of a patient circuit at an inspiratory pressure adjusted in relation to a pressure command; means for measuring the breathed volume; means for comparing the breathed volume with a volume command; means for indicating the simultaneous occurrence of a breathed volume below the volume command and an inspiratory pressure at least equal to a predetermined maximum pressure; and regulating means for increasing the inspiratory pressure command in the case of a breathed volume lower than the volume command, and for reducing the inspiratory pressure command in the case of a breathed volume higher than the volume command, wherein said regulating means increases the inspiratory pressure in the cases of a breathed volume less than the volume command where the inspiratory pressure command is less than the predetermined maximum pressure.
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15. A pressure mode breathing aid device, comprising:
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means for detecting the breathing activity of a patient and for generating, as a function of that activity, inspiration and expiration phases synchronized with said activity, means for supplying breathable gas, during the inspiration phases, to an inspiratory branch of a patient circuit at an inspiratory pressure adjusted in relation to a pressure command, characterized by; means for measuring the breathed volume; means for comparing the breathed volume with a volume command; means for indicating the simultaneous occurrence of a breathed volume below the volume command and an inspiratory pressure at least equal to a predetermined maximum pressure; and regulating means for increasing the inspiratory pressure command in the case of a breathed volume lower than the volume command, and for reducing the inspiratory pressure command in the case of a breathed volume higher than the volume command, wherein said regulating means computes a modified pressure and applies the modified pressure if the modified pressure does not go beyond a predetermined extreme value and makes the inspiratory pressure equal to the predetermined extreme value if the computed modified pressure goes beyond the predetermined extreme value.
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Specification