| abstract |
Respiratory delivery system comprising: a holding chamber (2) having an input end (12), an output end (14) comprising a user interface (16) having an outlet (18) and an interior volume (20) of space defined between said input and output end; a mechanical flow indicator (22) movable between an open position and a closed position where it seals against a seat (132) in response to inhalation or exhalation by a user through said outlet, wherein said mechanical flow indicator is configured with a conductive region (130), acting as a switch, wherein said conductive region of said mechanical flow indicator is movable into or out of contact with said seat, wherein said switch is closed or opened as the mechanical flow indicator is moved between said opened and closed positions; and an electronic indicator (220) operable in response to an electronic signal transmitted by said circuit in response to said switch being opened or closed by the movement of said mechanical flow indicator. |