A Vasectomy is a procedure performed in the office and considered a permanent method of birth control. A vasectomy prevents the release of sperm when a man ejaculates. During a vasectomy, the vas deferens from each testicle cut and sealed. This prevents sperm from mixing with the semen that is ejaculated from the penis. An egg cannot be fertilized when the no sperm is present in the semen. The testicles continue to produce sperm, but the sperm are reabsorbed by the body. Because the tubes are disrupted before the prostate, a man can still ejaculate the same amount of fluid.
In office Vasectomies are performed with a No-Scalpel technique under local anesthesia. It usually takes several months after a vasectomy for all of the remaining sperm to be ejaculated or reabsorbed. A man is still considered potent until a semen analysis proves no sperm. The procedure is also explained on Vasectomy.com