Do you mean vasectomy
? A vasectomy is the procedure to "tie off" and occlude the vas deferens
, the tubes that transport sperm
to the outside world via the ejaculate.
A vasectomy is reversible through microsurgery, but the success rate is not great. Several factors affect success: length of time since the vasectomy, scar tissue formation, testicular ability to produce sperm again. See your doctor.