Patent ID: 7305988
Filing Date: 2007-12-11
Classification: A61B,A61M

Abstract:
1. A nasal cannula control system for use in connection with a ventilator supplying ventilation gas to a patient through a patient interface, the system comprising: a control unit in communication with the ventilator; a nasal cannula assembly including a first lumen in pneumatic communication with the patient's airway and a second lumen in pneumatic communication with an area enclosed by the patient interface; a differential pressure sensor positioned to determine the differential pressure between the first lumen and the second lumen, wherein the differential pressure sensor is in communication with the control unit; and a gas sampling system in pneumatic communication with the first lumen, wherein the gas sampling system is operable to draw a measurement gas flow from a patient's airways through the first lumen, wherein the gas sampling system is operable to determine the gas concentration in the measurement gas flow and provides the gas measurement to the control unit.