Medico-surgical collection bags

摘要

An ostomy bag has a non-adhesive filter formed by a carbon fabric disc with impermeable layers on the front and back surfaces. The front layer has a central aperture whereas the rear layer is imperforate. The filter is releasably secured to an adhesive area around a vent opening of the bag with the aperture aligned with the opening so that gas can flow into the filter and radially outwards. The filter be peeled off and reversed to block escape of gas from the opening.