Preparation of therapeutic foam

1 - 12 . (canceled)

13 . A closed pouch comprising:

a wall defining an enclosed space containing carbon dioxide; and

a pair of syringes contained within said enclosed space, said syringes being connected together by a syringe connector, one of said syringes containing a gas or gas mixture other than air and the other of said syringes containing a foamable liquid.

14 . A pouch as claimed in claim 13 wherein said wall comprises a metalized plastics laminate.

15 . A pouch as claimed in claim 13 wherein the gas or gas mixture consists substantially of oxygen, carbon dioxide or a mixture thereof.

16 . A vessel as claimed in claim 13 wherein the foamable liquid is a sclerosant liquid solution.

17 . A vessel as claimed in claim 16 wherein the foamable liquid is a 1% solution of polidocanol.

18 . A pouch as claimed in claim 13 , wherein the wall is hermetically sealed.

19 . A pouch as claimed in claim 13 wherein the contents of the pouch are sterile.

20 . A pouch as claimed in claim 13 wherein the pressure of the carbon dioxide in the enclosed space is 1.1 bar absolute.

21 . A closed pouch comprising:

a wall defining an enclosed space containing carbon dioxide; and

a double plunger syringe contained within said enclosed space, said syringe containing a gas or gas mixture other than air and a foamable liquid.

22 . Method of producing a foam using a pouch as claimed in claim 13 , comprising breaking said syringe connector and pumping the syringes to produce a foam.

23 . Method as claimed in claim 22 wherein said pumping is performed manually or by using a machine.