| http://www.w3.org/ns/prov#value | - step (a) comprises receiving a medical device having a tube, a flange and a gas vent, the tube having a distal opening to admit gasses from the lung, the gas vent being positioned at a proximal end of the tube, the gas vent including a filter and a valve, and the flange extending from the tube spaced from the distal opening; and
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