Failed vasectomies usually occur in the first months, or up to a year after the procedure, but one UK man discovered the lapse can happen seven years later, doctors report.

The 37-year-old presented to a medical clinic because his wife had conceived seven years after he had a vasectomy.

Early recanalisation usually occurs between two and six weeks post-vasectomy. 

But doctors described failure due to late recanalisation, which occurred seven years post-vasectomy.