Above shows the difference between the double lumen concept (where air is introduced into one lumen every 15 minutes and exiting the suction lumen flushing the tube) and the single lumen concept (where air is constantly introduced flushing the suction tube) versus the FloSure Ventilation Patch concept where controlled filtered air is allowed to flow through the actual NPWT dressing, flushing the exudate through the dressing at the wound site and out through the suction tube in order to help prevent stagnation and pooling.