Catheter (3 of 3) (video) Duke University Loading video... Caption This prototype catheter has been rinsed for 20 seconds without removing the biofilm. Pressurizing the inflation channel with water deforms the main channel, dislodging the white biofilm which is then flushed from the channel by the regular flow. Credit Duke University Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.