APPARATUS AND METHOD FOR MASK FREE DELIVERY OF AN INSPIRED GAS MIXTURE AND GAS SAMPLING

WIPO Patent Application WO2001095971

A3

Disclosed is an apparatus and method for the delivery of inspired gas, e.g., supplemental O2, to a person combined with gas sampling, including for the purpose of monitoring of the ventilation of the person. In the invention, the delivery of inspired gas and gas sampling are accomplished without the use of a sealed face mask. The apparatus of one embodiment of the present invention comprises an oxygen delivery device, nasal airway pressure sampling devices, optionally an oral airway pressure sampling device and at least one pressure analyzer connected to the sampling devices which determine the phase of the person's respiration cycle and the person's primary airway. The oxygen delivery device is connected to a controller such that it delivers a higher flow of oxygen to the person during the inhalation phase of the person's respiratory cycle. The invention thus increases end tidal oxygen concentrations. The invention further comprises carbon dioxide sampling tubes that continuously sample gas from two nasal sites and the mouth. The nasal sampling tubes are connected to a switching valve that is in turn connected to a capnometer which determines carbon dioxide concentration during exhalation. The oral gas sampling site is connected to a second capnometer.

HICKLE RANDALL S
LAMPOTANG SAMSUN

PCT/US2001/018891

August 28, 2003

June 13, 2001

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SCOTT LAB INC (US)

A61B5/083; A61B5/097; A61M16/00; A61M16/01; A61M16/06; A61M16/12; A61M16/16; A61M16/20; A61M16/08; (IPC1-7): A61M16/00

WO1997005824A1

1997-02-20

US5099836A	1992-03-31
EP0951918A2	1999-10-27
US5046491A	1991-09-10
US5074299A	1991-12-24

See also references of EP 1359960A2

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