The connection of the vas deferens to the epididymis, called a vasoepididymostomy,  is required when blockage of the epididymis occurs either due to a build up of debris from the breakdown of sperm after a vasectomy or with scarring of the epididymis usually due to an infection. It is considered to be one of the more challenging microsurgical procedures. The Urologist planning reconstruction of the male genital ducts must be experienced and expert in perfoming this procedure.

This video demonstrates an end-to-side vasoepididymostomy on a 42 year man 15 years after a vasectomy. Sperm was found at the mid portion of the epididymis where reconstruction was performed. He conceived with his wife 8 months after the procedure.