A vasectomy is a permanent method of contraception in males. It is a minor operation that involves removal of the vas deferens. It is carried out either under general or local aneasthesia. The vas deferens is removed by a surgical scalpel or by diathermy. This method is thought to be less invasive than female sterilisation. Possible complications are wound infection, reaction to anaesthesia, bruising and leakage of sperm in the scrotum.