A partial-length catheter, or an extendable tube or sleeve member of the catheter, is selectively movable within the prostatic urethra to open a urine drainage passageway through and obstructed portion of the prostatic urethra or to open the external urinary sphincter muscle and thereby discharge urine...http://www.google.se/patents/US7662145?utm_source=gb-gplus-sharePatent US7662145 - Partial-length indwelling urinary catheter and method permitting selective urine discharge
