Patent urachus repair is a surgery to close a defect of the bladder. The urachus is a tube that connects the bladder to the area where the umbiblical cord was removed (umbilicus). As the baby grows inside the womb, the urachus normally closes. When the urachus fails to close, the tube remains open (patent). This creates an abnormal opening between the bladder and area where the umbiblical cord was removed. The condition increases one's risk for bladder infections.

While the child is unconscious and pain-free (using general anesthesia), an incision is made in the lower abdomen. The urachus is located and removed from the umbilicus and the bladder. The bladder opening is repaired, and the incision is closed.

From http://www.nlm.nih.gov/medlineplus/ency/article/002993.htm