In 2002, Mitreben Laboratories, based in Osaka, Japan, developed the hohi kenshutsuki, which they claimed to be the world's first fart detector.
'In hospitals, it is important for physicians to know if a post-operative patient has been farting,' explained Hideo Ueda, a member of the research team. 'When a patient is coming out from under total anaesthesia, farting is an indication that the digestive tract is returning to normal.
After major surgery, patients are still in a groggy state and aren't aware of this themselves'. That is what led to the development of this device.'
The average fart comprises 59 per cent nitrogen, 21 per cent hydrogen, 9 per cent carbon dioxide, 7 per cent methane and 4 per cent oxygen.