Patent ID: 7997271
Filing Date: 2011-08-16
Classification: A61B,A61M

Abstract:
1. An improved mask-free delivery apparatus that delivers inspired gas to a patient and accurately samples expired gases from the patient, said apparatus comprising: an inspired gas delivery device having a body comprising nasal lumens for extending into the patient's nares, said nasal lumens receiving patient exhalations and delivering same to a pressure analyzer for determining the phase of the patient's respiratory cycle and to a gas analyzer for analyzing the exhalation, and an oral lumen extending downward from the base for receiving patient exhalations for delivering same to a gas analyzer for analyzing the exhalation, said inspired gas delivery device having diffuser outlets carried by said body and being connected to a controller that modulates the flow of inspired gas to the patient in accordance with the phase of the patient's respiratory cycle, said outlets being spaced apart from the opening of said lumens to minimize dilution of said gas sample, a pressure analyzer being connected to said nasal lumens for determining the phase of the patient's respiratory cycle, and at least one gas analyzer being connected to said nasal lumens and said oral lumens, the said at least one gas analyzer measuring the level of a gas or drug in the exhaled gas, said pressure analyzer being connected to said controller for increasing the delivery of gas during the inhalation phase of the patient's respiratory cycle and for reducing the delivery of gas during the exhalation phase of the patient's respiratory cycle.