Patent Number: 039420230
Section: claims

1. A mortar based protective screen, for radiotherapeutic purposes and placed on a patient's skin, comprising: a flexible and leakproof jacket having two parallel walls; a side wall joining the said two parallel walls and having a surface area small relative to that of each parallel wall; at least one settable resin within said jacket; a fine particulate filler of at least one substance which absorbs radiotherapeutic radiation and is evenly mixed with the said resin; and a window permeable to radiotherapeutic radiation and positioned to permit radiation to pass between the parallel walls of the jacket. 2. A protective screen as set forth in claim 1, wherein the window consists of an elongate solid portion made from a material which is permeable to radiotherapeutic radiation and comprises two parallel end faces, one of which end faces is firmly fixed to the said jacket. 3. A protective screen as set forth in claim 2, wherein said elongate portion is cylindrical and has its base bonded to the jacket. 4. A protective screen as set forth in claim 2, wherein said elongate portion is made of polyethylene. 5. A protective screen as set forth in claim 1, and including at the side of the jacket a tubular portion sealed at its free end and adapted to allow a curing agent to be introduced inside the jacket once the sealed end has been opened. 6. A protective screen as set forth in claim 1, and including a rupturable pouch within the jacket, and a curing agent within said pouch for mixing with the thermosetting resin immediately before use of the jacket as a protective screen. 7. A protective screen as set foth in claim 6, wherein said rupturable pouch is partially fixed to the inside face of the jacket. 8. A protective screen according to claim 7, wherein the pouch is fixed to the interior of said tubular portion. 9. A protective screen as set forth in claim 6, wherein said rupturable pouch consists partially of a rupturable sheet and partially of a part of the jacket, the rupturable sheet being welded at its edge to the said jacket and serving to cover the curing agent. 10. A protective screen as set forth in claim 1, wherein the settable resin is a resin selected from the group consisting of epoxy, polyester and phenolic resins. 11. A protective screen as set forth in claim 1, wherein said substance which absorbs radiotherapeutic radiation consists of at least one compound selected from the group consisting of barium sulphate, antimony oxide, silica and lead oxide, and is in the form of a fine powder. 12. A protective screen as set forth in claim 11, wherein said substance consists of a mixture of at least two compounds selected from the group consisting of barium sulphate, antimony oxide, silica and lead oxide. 13. A protective screen as set forth in claim 1, wherein said jacket is formed of a material selected from the group consisting of a polyamide and an elastomer. 14. A protective screen as set forth in claim 1, wherein the jacket consists of a plasticised fabric. 15. A protective screen as set forth in claim 1, and including a flexible heat insulating mass provided on that side of the jacket which in use, will face the patient. 16. A protective screen according to claim 15, wherein said heat insulating mass is a sheet of foam rubber.