Suture-Free Technique for Canine Ureteral Resection-Anastomosis Using a Microvascular Anastomotic System: A Cadaveric Study

Objective To describe a suture‐free technique for canine ureteral resection‐anastomosis using a microvascular anastomotic system (MAS) and to compare surgical time and burst pressure of hand‐sewn (HS) ureteral end‐to‐end anastomosis with the MAS technique. Study Design Experimental ex vivo study. Animals Canine cadavers (n = 8). Methods For each cadaver, 1 ureter was randomly assigned to undergo HS anastomosis and the contralateral ureter had MAS anastomosis. The first 3 cadavers (6 ureters) were used to refine the MAS technique. In the other 5 dogs, surgical time and ureteral burst pressure were compared between groups (n = 5 ureters/group). Results Preliminary procedures showed that selective impaling of the mucosa and submucosa (without muscularis and adventitia) is necessary to allow complete mechanical interlock of the anastomotic rings for the MAS technique. Median anastomotic time was significantly shorter for MAS (7.6 min) than HS (16.6 min; p = .029) and burst pressure higher for MAS (393 cm H2O) than HS (180 cm H2O; p = .012). Conclusion This study demonstrated the feasibility of a suture‐free technique of canine ureteral resection‐anastomosis using a commercially available MAS. The MAS anastomosis was faster and had higher burst strength compared with the HS anastomosis.