Methods and devices for sensing respiration and controlling ventilator functions

摘要

Improved methods and devices are described for sensing the respiration pattern of a patient and controlling ventilator functions, particularly for use in an open ventilation system. A ventilation and breath sensing apparatus may include a ventilation gas delivery circuit and a ventilation tube coupled to the ventilation gas delivery circuit. A plurality of pressure sensing elements may be separated by a distance and may produce independent signals. The signals may be used to detect pressure differentials between the plurality of pressure sensing elements. Sensing ports may be located in an airway, and connected to transducers that are valved to optimize sensitivity and overpressure protection. Airway pressure and flow can both be obtained and used to optimize ventilator synchronization and therapy.

主权项

1. A ventilation and breath sensing apparatus comprising:
a ventilation gas delivery circuit; a ventilation tube coupled to the ventilation gas delivery circuit and further defined by a patient airway end; a plurality of pressure sensing elements disposed on the patient airway end of the ventilation tube and separated by a distance, each producing independent signals, airflow through a patient airway being derived from direct measurements of pressure differentials between the plurality of pressure sensing elements; wherein control over at least one of ventilation gas delivery timing, amplitude, speed, waveform shape, frequency, and composition is based upon a correlated combination of the signals from the pressure sensing elements and the derived airflow to adapt to a true breathing activity by a patient.