Method and system for ventilation
First Claim
1. A method of monitoring tracheal pressure of a subject, the subject being ventilated with breathing gas flowing via an endotracheal tube having an inflatable cuff, the method comprising:
- monitoring sealing of the trachea by controlling a baseline pressure within said cuff using a close loop control, such as to generally minimize said baseline pressure while ensuring said sealing;
applying variation to a ventilation pressure thereby varying a flow level of the breathing gas;
monitoring variation in a peak above said baseline of a pressure pulse within said cuff responsively to said variation of said ventilation pressure;
calculating a ratio between said monitored variation in said peak and said applied ventilation pressure variations;
calculating the tracheal pressure using said calculated ratio; and
suctioning secretions from the endotracheal tube in synchronization with said monitored tracheal pressure.
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Accused Products
Abstract
A method of monitoring tracheal pressure of a subject is disclosed. The subject is ventilated with breathing gas flowing via an endotracheal tube having an inflatable cuff. The method comprises monitoring sealing of the trachea by the cuff using a close loop control, varying a ventilation pressure thereby varying flow level of the breathing gas, monitoring a response pressure within the cuff in response to the variation, and calculating the tracheal pressure using the ventilation pressure variations, the cuff response pressure and the flow level. In some embodiments, an under-pressure is applied for suctioning fluid carrying secretions, synchronously with variations in the tracheal pressure.
34 Citations
24 Claims
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1. A method of monitoring tracheal pressure of a subject, the subject being ventilated with breathing gas flowing via an endotracheal tube having an inflatable cuff, the method comprising:
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monitoring sealing of the trachea by controlling a baseline pressure within said cuff using a close loop control, such as to generally minimize said baseline pressure while ensuring said sealing; applying variation to a ventilation pressure thereby varying a flow level of the breathing gas; monitoring variation in a peak above said baseline of a pressure pulse within said cuff responsively to said variation of said ventilation pressure; calculating a ratio between said monitored variation in said peak and said applied ventilation pressure variations; calculating the tracheal pressure using said calculated ratio; and suctioning secretions from the endotracheal tube in synchronization with said monitored tracheal pressure. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of monitoring tracheal pressure of a subject, the subject being ventilated with breathing gas flowing via an endotracheal tube having an inflatable cuff, the method comprising:
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monitoring sealing of the trachea by controlling a baseline pressure within said cuff using a close loop control, such as to generally minimize said baseline pressure while ensuring said sealing; applying variation to a ventilation pressure thereby varying a flow level of the breathing gas; monitoring variation in a peak above said baseline of a pressure pulse within said cuff responsively to said variation of said ventilation pressure; calculating a ratio between said monitored variation in said peak and said applied ventilation pressure variations; calculating obstruction level of said endotracheal tube based on said calculated ratio, an effective internal radius of the endotracheal tube based on said obstruction level, and a pressure drop resulting from said effective internal radius; calculating the tracheal pressure using said pressure drop; and suctioning secretions from the endotracheal tube in synchronization with said monitored tracheal pressure. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A system for calculating tracheal pressure of a subject, the subject being ventilated with breathing gas flowing via an endotracheal tube having an inflatable cuff, the system comprising:
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a cuff inflating unit for inflating said cuff; a controller, for adjusting said inflation of said cuff so as to provide a minimal cuff inflation pressure being sufficient to ensure sealing of the trachea by said cuff, and for applying variation to a ventilation pressure and flow level of the breathing gas; a pressure sensor for sensing a pressure within said cuff to monitoring variation in a peak above a baseline of a pressure pulse within said cuff responsively to said variation of said ventilation pressure; and a tracheal pressure calculator for calculating a ratio between said monitored variation in said peak and said applied ventilation pressure variations, and for calculating the tracheal pressure using said calculated ratio. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of monitoring tracheal pressure of a subject, the subject being ventilated with breathing gas flowing via an endotracheal tube having an inflatable cuff, the method comprising:
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monitoring sealing of the trachea by controlling a baseline pressure within said cuff using a close loop control, such as to generally minimize said baseline pressure while ensuring said sealing; applying variation to a ventilation pressure thereby varying a flow level of the breathing gas; monitoring variation in a peak above said baseline of a pressure pulse within said cuff responsively to said variation of said ventilation pressure; calculating a ratio between said monitored variation in said peak and said applied ventilation pressure variations; and calculating the tracheal pressure using said calculated ratio; wherein said monitoring said sealing of the trachea comprises measuring a level of at least one measure being indicative of leakage of secretion past said cuff to the lungs; and
the method further comprises adjusting inflation of said cuff based on said level of said at least one measure so as to generally minimize leakage of secretion from above said cuff to the lungs, while minimizing pressure associated damages to the trachea.
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23. A method of monitoring tracheal pressure of a subject, the subject being ventilated with breathing gas flowing via an endotracheal tube having an inflatable cuff, the method comprising:
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monitoring sealing of the trachea by controlling a baseline pressure within said cuff using a close loop control, such as to generally minimize said baseline pressure while ensuring said sealing; applying variation to a ventilation pressure thereby varying a flow level of the breathing gas; monitoring variation in a peak above said baseline of a pressure pulse within said cuff responsively to said variation of said ventilation pressure; calculating a ratio between said monitored variation in said peak and said applied ventilation pressure variations; calculating the tracheal pressure using said calculated ratio; and delivering at least one identifiable additive through said endotracheal tube. - View Dependent Claims (24)
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Specification