“Leroy invented a two-bladed instrument to aid in the insertion of a laryngeal tube by the ability to control the direction of its tip. He also invented a limiting mechanism for the bellows, to enable given amounts of air to be inflated, after he noticed at post-mortem where bellows had been used for inflation, that emphysema and tension pneumothorax were not uncommon. This research eventually led to the abandonment of bellows in resuscitation kits. Leroy also advocated chest and abdominal compression” (Huston).