Surgical drainage bags

摘要

A filter for a surgical drainage bag has a filter layer of activated carbon cloth. Gases may pass through this filter layer from the interior of the bag. A first layer of gas permeable thermoplastics material is arranged in contact with the front side of the filter layer. A barrier layer of gas permeable hydrophobic material has its rear side in contact with the front side of the first layer. A second layer of gas permeable thermoplastics material has its rear side in contact with the front side of the barrier layer. All the various layers are secured together by a peripheral seal.