Patent ID: 9089660
Filing Date: 2015-07-28
Classification: A61M,A62B

Abstract:
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.