Generation of Therapeutic Microfoam

A device is provided for producing a microfoam suitable for use in sclerotherapy of blood vessels comprising a housing in which is situated a pressurisable chamber with one or more outlet orifices; a pathway by which contents of the chamber may be passed to exterior of the housing through the one or more outlet orifices and a mechanism by which the chamber can be pressurised such that its contents therein pass to the exterior along the pathway and through the one or more outlet orifices, said pathway to the exterior of the housing or the chamber including one or more elements defining one or more passages of cross sectional dimension 0.1 µm to 30 µm through which contents of the chamber are passed actuation of the mechanism characterised in that the device comprises a syringe barrel, having a needle or catheter affixing end, and a functionally co-operating syringe plunger which together with the barrel defines a chamber, said plunger being the mechanism for pressurising the chamber, that chamber containing the gas and liquid in use and wherein the passages are adjacent or at the needle affixing end of the syringe barrel.