In urology, the Mitrofanoff principle is the creation of a passageway for urine or enema fluid that, by its (surgical) construction, has a valve mechanism to allow continence.
Procedures which make use of the Mitrofanoff principle:
Eponym
It is named after the French urologist (Mitrofanoff) who popularized it.
References
Mitrofanoff principle Wikipedia(Text) CC BY-SA