A ureteral access sheath adapted for insertion into a urethra includes an elongate tube extending between a proximal end and a distal end. A handle assembly is disposed at the proximal end and includes enlarged portions which inhibit migration of the sheath into the urethra. The enlarged portions are...http://www.google.es/patents/US7316677?utm_source=gb-gplus-sharePatente US7316677 - Ureteral access sheath
