Mouth Gag Davis Boyles Gag Frame
Boyle Davis mouth gag was initially used for inhalational anesthesia to keep the patient's mouth open. In 1910 Edward C Sewall published an exhausive description of a mouth gag which he had designed. He admitted that it was a variant of a mouth gag designed earlier by Hartman.
This mouth gag was noticed by SGriffith Davis. He modified it further to be used to performe tonsillectomy. In1912, a description of Davis gag was published by Harvey W cushing. Britishan esthesiologist Henry E.G. Boyle when he was in US impressed by Davis gag bought one. He modified it and christened it as Boyle Davis mouth gag.