Breathing assistance apparatus

摘要

A breathing assistance apparatus capable of operating in alternating inhalation and expiratory phases includes a pressurized respiratory gas source, an inhalation duct to supply gas from the pressurized respiratory gas source to a patient, and an expiratory duct for expiratory gas of the patient. The apparatus further includes a set of flow rate sensors positioned to sense a first flow rate of the expiratory duct and a second flow rate of the inhalation duct, and a controller, including a processor, configured to control the gas source. The inhalation duct includes an inhalation valve, the inhalation valve configured to provide proportional operation and the inhalation valve is selectively controlled by the controller to move to a specific position to allow a desired level of flow through the inhalation valve to the patient.

主权项

1. A breathing assistance apparatus capable of operating in alternating inhalation and expiratory phases, the apparatus comprising:
a pressurized respiratory gas source, an inhalation duct to supply gas from the pressurized respiratory gas source to a patient, an expiratory duct for expiratory gas of the patient, a set of flow rate sensors positioned to sense a first flow rate of the expiratory duct and a second flow rate of the inhalation duct, and a controller, including a processor, configured to control the gas source, the controller further configured to compare the first flow rate and the second flow rate in a volumetric mode, and to trigger a new inhalation phase based on a difference between the first flow rate and the second flow rate, wherein the inhalation duct includes an inhalation valve comprising a valve body having an orifice configured to connect to the inhalation duct, and a moving element defining a recess for allowing passage of a gas therethrough, the moving element being translatable relative to the valve body in a first direction such that the orifice and recess are capable of alignment to allow the gas from the gas source to pass through to the inhalation duct in use, wherein a translation of the moving element is proportional to passage of the gas from the gas source through the inhalation duct via the orifice during use.