A gas-assisted fluid-dispensing device configured to deliver an aerosol onto a surgical site, and methods of use. The device includes a support structure and a fluid chamber. The fluid chamber contains a fluid and has a distal end and a proximal end. A piston is positioned within the fluid chamber. A spray nozzle tip is fluidly coupled to the distal end of the fluid chamber and includes a gas inlet. The tip generates the aerosol with a gas from the gas inlet and the fluid from the fluid chamber. A pneumatic switch has a first stage and a second stage. The first stage permits gas flow through the pneumatic switch and into the gas inlet of the tip. The second stage permits gas flow through the pneumatic switch and into both the gas inlet of the tip and into the fluid chamber.
