Patient-ventilator synchronization using dual phase sensors
First Claim
1. A method of providing synchronized ventilatory support to a patient comprising the steps of:
- providing an apparatus to deliver ventilatory support to a patient, the apparatus comprising an airflow sensor and a respiratory effort sensor;
determining at least one instantaneous phase of respiration of the patient continuously at least during inspiration at least in part from both measured respiratory airflow and a signal from a respiratory effort sensor;
calculating a desired pressure value using the determined phase and a desired ventilation pressure amplitude; and
delivering ventilation to said patient in accordance with said desired pressure value.
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Accused Products
Abstract
An improved ventilator which delivers ventilatory support that is synchronized with the phase of the patient'"'"'s 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.
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Citations
49 Claims
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1. A method of providing synchronized ventilatory support to a patient comprising the steps of:
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providing an apparatus to deliver ventilatory support to a patient, the apparatus comprising an airflow sensor and a respiratory effort sensor;
determining at least one instantaneous phase of respiration of the patient continuously at least during inspiration at least in part from both measured respiratory airflow and a signal from a respiratory effort sensor;
calculating a desired pressure value using the determined phase and a desired ventilation pressure amplitude; and
delivering ventilation to said patient in accordance with said desired pressure value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for providing synchronized 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 in communication with the effort signal, and the airflow signal configured for analyzing both the respiratory airflow signal and the effort signal and to determine at least one instantaneous phase of a respiratory cycle of the patient continuously at least during inspiration and to generate a pressure request signal as a function of said instantaneous respiratory phase and a ventilation pressure amplitude; and
a servo-controlled blower to provide pressurized air to said patient in accordance with said pressure request signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method of providing synchronized ventilatory support to a patient comprising the steps of:
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providing an apparatus for ventilatory support to a patient comprising a flow sensor and a respiratory effort sensor;
determining at least one instantaneous phase of respiration of the patient continuously at least during inspiration, said instantaneous phase being represented as a fraction of a revolution of a respiratory cycle at least in part from a signal from the respiratory effort sensor and a signal from the flow sensor;
calculating a pressure value using the determined phase and a ventilation pressure amplitude;
and delivering ventilation to said patient in accordance with said pressure value. - View Dependent Claims (39, 40, 41, 42, 43)
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44. An apparatus for providing synchronized 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 in communication with the effort signal and airflow signal configured for analyzing both said effort signal and said airflow signal and to determine an instantaneous phase of a respiratory cycle of the patient continuously at least during inspiration represented as a fraction of a revolution of a respiratory cycle and to generate a desired pressure request signal as a function of said instantaneous respiratory phase and a desired ventilation pressure value; and
a servo-controlled blower to provide pressurized air to said patient in accordance with said pressure request signal. - View Dependent Claims (45, 46, 47, 48)
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49. A method of providing synchronized ventilatory support to a patient comprising the steps of:
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providing an apparatus to deliver ventilatory support to a patient, the apparatus comprising an airflow sensor and a respiratory effort sensor;
determining an instantaneous phase of respiration of the patient continuously during inspiration and expiration cycles of the patient at least in part from both measured respiratory airflow and a signal from a respiratory effort sensor, calculating a desired pressure value with the determined phase value and a desired ventilation pressure amplitude; and
delivering ventilation to said patent in accordance with said desired pressure value during the patien'"'"'s inspiration and expiration cycles.
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Specification