The doctor gently locates each vas deferens and administers local anesthetic with one snap of the hypospray over each vas, which numbs the central skin site and both vasa. The left vas deferens is then held just under the skin on the front of the scrotum while a small puncture opening about 1/8 inch long is made in the skin to expose the vas. The vas is separated from the sheath of surrounding tissues and brought out through the opening. It is then cut and sealed using electrocautery, a small electric current that heats the lining of the vas.
