A - Human Necessities – 62 – B
Patent
A - Human Necessities
62
B
2/45, 137/1.5
A62B 7/00 (2006.01) A62B 18/00 (2006.01)
Patent
CA 1039144
ABSTRACT OF THE INVENTION Direct measurement of the inspired tracheal oxygen concentration (FiO2) made in patients breathing through standard aerosal face masks and factors affecting the tracheal FiO2 were analyzed using a mechanical model. It was found that turbulent air currents within and around the face mask reduce the measured FiO2 and contribute to fluctuations in the FiO2. These effects could be virtually eliminated by the shielded mask of the invention which consists of a standard mask with large cheek holes where the cheek holes are partially covered by cup shaped shields. Using the shielded mask, it is possible to more accurately deliver to the patient the desired oxygen concentration and to maintain humidification of the delivered gases. As a result desired changes in inspired oxygen concen- tration can be accomplished by changing the concentration of the incom- ing gas mixture, rather than by changing the flow rate of oxygen delivered to the system. In addition, using the shielded mask, it is possible to deliver an inspired oxygen concentration of 100%, a condition which was not possible with the standard mask.
256937
Cooper Joel D.
Scott Arthur A.
Wexler Ronald
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