Modified Hewitt's Pharyngeal Airway
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Following the development of an ether mask that would exclude the inhalation of air, Ferguson has been attributed with the modification of a Hewitt's airway.
Single aluminium tube with mouth prop covered in red rubber tube that has now adhered and not removable without damaging the rubber. There is a section cut out of the side of the rubber tubing through which the metal tube is visible.
