| abstract |
A gas flow indicator apparatus ( 10 ) comprising: a gas flow chamber including at least one transparent portion ( 30 ) and at least one opaque portion ( 36 ); at least one inlet port ( 34 ); at least one outlet port ( 32 ); and, at least one gas flow signal means ( 18 ) movably disposed within the gas flow chamber. The gas flow indicator apparatus ( 10 ) being configured such that when no gas flow is present and/or when a predetermined gas flow rate has not been achieved, the signal means ( 18 ) is disposed substantially within one of the transparent portion ( 30 ) or the opaque portion ( 36 ), and wherein when gas flow is present and/or the predetermined gas flow rate has been achieved, the signal means ( 18 ) is moved to be disposed substantially within the other of the transparent portion ( 30 ) or the opaque portion ( 36 ). Gas delivery devices ( 12 ), systems ( 12 ) and/or conduits ( 16 ) incorporating the gas flow indicator apparatus ( 10 ) are also provided in accordance with the invention. |