Spanish to English Medical Other urology case report

This refers to a surgical procedure in which an end-to-end anastomosis is performed on a ureter that had suffered complete disruption due to trauma.
I understand "refrescar" as preparing the ends prior to anastomosis, but I'm not sure how to say it in English.

The whole sentence is:
Se realiza una anastomosis término- terminal sobre catéter ureteral , tras refrescar ambos extremos.