Patient-ventilator synchronization using dual phase sensors
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Accused Products
Abstract
An improved ventilator which delivers ventilatory support that is synchronized with the phase of the patients respiratory efforts and guarantees a targeted minimum ventilation. Improved synchronization is achieved through an instantaneous respiratory phase determination process based upon measured respiratory airflow as well as measured respiratory effort using an effort sensor accessory, preferably a suprasternal notch sensor. The ventilator processes a respiratory airflow signal, a respiratory effort signal and their respective rates of change to determine a phase using standard fuzzy logic methods. A calculated pressure amplitude is adjusted based upon the calculated phase and a smooth pressure waveform template to deliver synchronized ventilation.
73 Citations
56 Claims
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1-40. -40. (canceled)
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41. A method of providing ventilatory support to a patient comprising the steps of:
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providing apparatus to deliver ventilatory support to the patient, the apparatus also measuring both respiratory airflow and respiratory effort;
calculating a desired pressure value based at least in part on the measured respiratory airflow and respiratory effort; and
delivering ventilation to said patient in accordance with said desired pressure value. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48)
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49. An apparatus for providing ventilatory support to a patient comprising:
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at least one sensor to generate a respiratory effort signal;
at least one sensor to generate a respiratory airflow signal;
a processor for determining a pressure request signal at least in part as a function of the effort signal and the airflow signal; and
a blower to provide pressurized air to said patient in accordance with said pressure request signal. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56)
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Specification