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Device containing sclerosant liquid for use in the treatment of blood vessels having an aerosol valve housing containing gas-entry ports. The aerosol valve housing is mounted on a canister having an expandable inner container in which the sclerosant fluid is contained. The expandable inner container

Device containing sclerosant liquid for use in the treatment of blood vessels having an aerosol valve housing containing gas-entry ports. The aerosol valve housing is mounted on a canister having an expandable inner container in which the sclerosant fluid is contained. The expandable inner container is affixed to the outer opening of the canister or to the aerosol valve housing above the valve gas-entry ports so that gas taken from the interior of the expandable inner container can mix with the sclerosant liquid to create a micro foam, such that introduction of pressurized gas through the aerosol valve causes the expandable inner container to inflate to accommodate the pressurized gas.

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1. A device containing sclerosant liquid for use in the treatment of blood vessels comprising an aerosol valve housing comprising gas-entry ports, wherein the aerosol valve housing is mounted on a canister having an expandable inner container in which the sclerosant fluid is contained, wherein the e

1. A device containing sclerosant liquid for use in the treatment of blood vessels comprising an aerosol valve housing comprising gas-entry ports, wherein the aerosol valve housing is mounted on a canister having an expandable inner container in which the sclerosant fluid is contained, wherein the expandable inner container is affixed to the outer opening of the canister or to the aerosol valve housing above the valve gas-entry ports so that gas taken from the interior of the expandable inner container can mix with the sclerosant liquid to create a micro foam, whereby the introduction of pressurised gas through the aerosol valve causes the expandable inner container to inflate to accommodate the pressurised gas, wherein the device includes a vent in the canister that is sealed during storage and is opened prior to use to reduce the pressure inside the canister and permit full expansion of the expandable inner container. 2. A device according to claim 1 wherein the sclerosant liquid contained therein may be mixed with a pressurised gas comprising a physiologically acceptable blood dispersible gas to produce a sclerosing foam. 3. A device according to claim 1 wherein the physiologically acceptable blood dispersible gas is stored in a separate container prior to use. 4. A device according to claim 1 wherein mixing of gas and aqueous sclerosant occurs inside the aerosol valve at the mouth of the expandable inner container. 5. A device according to claim 1 comprising a pathway with one or more outlet orifices by which the sclerosing liquid may pass from the expandable inner container to the exterior of the device through said one or more outlet orifices and a mechanism by which the pathway from the inner container to the exterior can be opened or closed such that, when the container is pressurised and the pathway is open, the pressurised gas contacts the sclerosant liquid within the pathway to produce a gas-solution mixture; the gas-solution mixture is forced along the pathway and through the one or more outlet orifices, said pathway to the exterior of the canister including one or more foaming elements; and the blood-dispersible gas is stored in a container provided with engaging means for the canister holding the aqueous sclerosant liquid. 6. A device for producing a microfoam suitable for use in scleropathy of blood vessels, comprising an aerosol valve housing comprising gas-entry ports, wherein the aerosol valve housing is mounted on a canister, an expandable inner container affixed to the outer opening of the canister or to the aerosol valve housing above the valve gas-entry ports so that gas taken from the interior of the expandable inner container can mix with the sclerosant liquid to create the microfoam, whereby the introduction of pressurised gas through the aerosol valve causes the expandable inner container to inflate to accommodate the pressurised gas, a pathway with one or more outlet orifices by which the solution may pass from the inner container to the exterior of the device through said one or more outlet orifices and a mechanism by which the pathway from the inner to the exterior can be opened or closed such that, when the container is pressurised and the pathway is open, a gas-solution mixture will be forced along the pathway and expelled through the one or more outlet orifices; said canister incorporating an inlet for the admission of a pressurised source of physiologically acceptable gas that is dispersible in blood; the gas being in contact with the solution on activation of the mechanism such as to produce the gas-solution mixture;said pathway to the exterior of the device including one or more foaming elements;wherein the device includes a vent in the canister that is sealed during storage and is opened prior to use to reduce the pressure inside the canister and permit full expansion of the expandable inner container. 7. A device according to claim 6 wherein the expandable inner container contains a solution of the sclerosing agent. 8. A device according to claim 7 wherein the solution of the sclerosing agent is mixed with physiologically acceptable gas in a predetermined proportion. 9. A device according to claim 1 wherein the expandable inner container comprises a flexible, expandable substantially gas-impermeable material. 10. A device according to claim 8 wherein the expandable inner container is in the form of a pleated bag. 11. A device according to claim 10 wherein the expandable inner container comprises metal or metallised foil. 12. A device for producing a microfoam suitable for use in scleropathy of blood vessels, in the form of a kit comprising: (a) a device according to claim 1; and(b) a pressurised container containing a physiologically acceptable blood-dispersible gas;said canister incorporating an inlet for the admission of blood-dispersible gas; the gas being in contact with the solution on activation of the mechanism such as to produce the gas-solution mixture. 13. A device according to claim 12 wherein a foaming element or elements is provided having one or more passages mounted such that the gas-liquid mixture passes through the passage or passages and is caused to foam. 14. A device according to claim 13 wherein the foaming element(s) comprises one or more passages of cross sectional dimension 0.1 μm to 30 μm, through which the gas-liquid mixture is passed to reach the exterior of the device, said passing of said mixture through the passages forming a microfoam of from 0.07 to 0.19 g/ml density and of half-life at least 2 minutes. 15. A device according to claim 1 wherein the sclerosant liquid is a solution of polidocanol or sodium tetradecyl sulfate in an aqueous carrier. 16. A device containing sclerosant liquid for use in the treatment of blood vessels comprising an aerosol valve housing comprising gas-entry ports and an expandable container in which the sclerosant fluid is contained, wherein the expandable container is affixed to the aerosol valve housing above the valve gas-entry ports so that gas taken from the interior of the expandable inner container can mix with the sclerosant liquid to create a microfoam, whereby the introduction of pressurised gas through the aerosol valve causes the expandable container to inflate to accommodate the pressurised gas, wherein the device includes a vent in the canister that is sealed during storage and is opened prior to use to reduce the pressure inside the canister and permit full expansion of the expandable inner container.