Soft mist devices
A device known as "soft mist" is thus named because it uses a spring-like mechanism to drive the liquid through its end, generating an aerosol cloud for 1 to 1.5 seconds. An example is the Respimat® (Figure 7), manufactured by Boehringer Ingelheim, Germany, which is portable, propellant-free, easy to use, and can carry several doses; in addition, spacers, batteries or any power source are not required for its operation. In adults, lung deposition with this device is around 40%.