US Patent 7183454 Multipurpose dynamic occlusive dressing

Occlusive dressing system, which comprises an endless, elongated, flexible, adhesive barrier, adapted to be arranged in a closed configuration, whereby to bound and define a surface area, and an impermeable sealing film adapted to overlie said surface area and to isolate it from the environment, when superimposed to said barrier arranged in said configuration, said barrier forming a gas-tight seal with said sealing film when the two are applied to and pressed against one another. A spreading mechanism that alows a single person to spread the sealing film over the occluding barrier and to detach the film from the main roll and ports (inlet and outlet) that can be placed across the barrier or the occluding film.