Oxygen diverter valve

摘要

A vent assembly for use with a respiratory mask of the type used in CPAP treatment includes a porous disk portion that is attached to a biasing member such that the disk portion is maintained in a substantially sealed position against a main vent to minimize airflow through at least one side vent of the vent assembly. Debris build-up on the disk portion can cause the biasing member to deflect to provide an additional path for airflow through the at least one side vent. In another embodiment, the vent assembly can also include an anti-asphyxia feature to provide an airflow path from the environment to the user. An oxygen diverter valve may be disposed between the breathing apparatus flow generator and an oxygen injection port.

主权项

1. A vent assembly for a respiratory mask, the vent assembly comprising:
a substantially planar surface with a plurality of openings, the substantially planar surface being movable between a first position and a second position; and a biasing mechanism that biases the substantially planar surface toward the first position, wherein the vent assembly defines a first exhalation airflow path to atmosphere via the plurality of openings of the planar surface when the substantially planar surface is at the first position and defines a second exhalation airflow path when the substantially planar surface is between the first and second positions or at the second position.