Abstract: An inhalation valve is presented for use with a known antiasthmatic medication cartridge and mouthpiece to simplify patient inhalation and to improve mist formation. A cylindrical passageway receives the known mouthpiece and is provided with an elastomeric diaphragm having a slit therein. An upstream spider backs up the diaphragm. Upon inhalation the diaphragm flexes and stretches to open the slit, and the diaphragm seals off exhaust passages. On exhalation the diaphragm backs against the spider which seals the slit, the diaphragm moving away from and opening the exhaust passages.

Abstract: An inhalation valve is provided for testing the breathing capacity of a person. The valve is constructed of two plastic moldings which snap together and trap a flexible elastomeric valve diaphragm between them. The valve is provided with a mouthpipe. Exhalation through the mouthpipe deflects the diaphragm to permit substantially unrestricted exhalation. Inhalation is through a laterally displaced passageway having a transverse wall therein to produce a pressure drop. Tubular fittings are provided in the pressure drop area behind the wall and exteriorally of the flow path to provide an input to an electronic apparatus to indicate the efficiency of breathing.