A spray device (6) for the delivery of a therapeutic agent, the spray device (6) comprises a nozzle (1) having a first port (3) to input a gas source of positive gas pressure a second port (4) to output gas from the gas source and a Coanda surface (5) and a third port (2) between, and in fluid connection with, the first port (3) and the second port (4). The nozzle (1) is arranged such that, in use, a gas including a therapeutic agent enters the first port (3), the therapeutic agent having sufficient momentum to overcome forces from the gas flow over the Coanda surface (5) such that the therapeutic agent is ejected at the third port (2) in the form of a spray.
