The Leech airway or “Pharyngeal Bulb Gasway”, was patented1 in 1937 by Dr. Beverley C. Leech (1898-1960). Born in Brandon, Manitoba, Dr. Leech served in World War I as a Lieutenant in the Canadian Infantry. He obtained his medical degree from McGill University in 19251 and later became the director of anesthesia at the Regina General Hospital. He is currently recognized as one of the pioneers of Canadian anesthesia.
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Leech BC. Pharyngeal bulb gasway. Patent for the Leech airway filed on December 30th, 1936. Patent was granted on November 16th, 1937 (US patent number 2099127 A). Available from URL: https://www.google.com/patents/US2099127 (accessed December 2017).
Maltby JR. Leech pharyngeal bulb gasway. The History of Anaesthesia Society Proceedings. Proceedings of the Summer Scientific Meeting - 25th and 26th June 2010 - volume 42: 95-101. Available from URL: http://www.histansoc.org.uk/uploads/9/5/5/2/9552670/9865-1.pdf (accessed December 2017).
Brain AI. Artificial airway device. Patent for supraglottic airway device filed on December 16th, 1981. Patent was granted on December 14th, 1982 (US patent number 4509514 A). Available from URL: https://www.google.com/patents/US4509514 (accessed December 2017).