A urinary catheter and method of its use for measuring the internal pressure of a human or other mammal. The catheter includes three lumens, or channels. The first lumen is dedicated to draining urine, the second lumen is dedicated to a retention balloon, and the third lumen is available for connection...http://www.google.de/patents/US7381190?utm_source=gb-gplus-sharePatent US7381190 - Intra-abdominal pressure monitoring urinary catheter
