English to Italian Medical Medical (general) chirurgia

Si tratta di un manuale americano di chirurgia, in particolare un capitolo sul sistema biliare.
Nel paragrafo relativo all'esplorazione laparoscopica del coledoco vengono spiegati i due approcci comuni (quello transcistico e la coledocotomia).
Non riesco a rendere questo allowed (intendo the water irrigation system is allowed to...), forse devo renderlo in modo attivo.
Grazie mille.

In the transcystic approach, at the completion of cholangiography, a wire is fed down the cystic duct into the common bile duct. Through a Seldinger technique or use of a balloon catheter, the cystic duct is gently dilated to allow passage of a flexible choledochoscope. Alternatively, a flexible ureteroscope can be used. To pass the fiberoptic scope through the duct system, a water irrigation system is attached and allowed to constantly infuse out the end of the scope.