Patent ID: 9690300
Date: 2017-06-27
CPC Classifications: A61B,G05D,Y10T

Claim:
1. A gas flow regulating device for use as part of a medical system for sampling a patient's breath, the device comprising: a housing having a distal first end forming an outlet orifice, and a proximal second end, opposite the first end, forming an inlet port, the inlet port forming a valve seat body having (i) an inner portion comprising an inner first end-facing surface, and (ii) an outer portion extending circumferentially around the inner portion and comprising an outer first end-facing surface distally of the inner first end-facing surface, and (iii) a middle first end-facing surface that tapers from the outer first end-facing surface to the inner first end-facing surface, wherein a through hole extends entirely through the outer portion from an outer second end-facing surface through the outer first end-facing surface; an inlet tube forming a lumen having an inlet end and a flange extending radially from the inlet tube, the inlet tube slidably disposed within the housing such that, in an open state, the inlet tube is retracted from the second end such that an incoming airflow entering the inlet port through the opening in the valve seat body is directed to a pressure chamber formed between the flange of the inlet tube and the first end, and in a closed state, the inlet tube is advanced toward the second end to fluidly seal the inlet tube against the inner first end-facing surface, wherein when the flange is engaged against the first end in the open state, the inlet port and the outlet orifice are fluidly coupled.