The Didcott dilator.
Didcott
C C
CC
D004106:Dilatation / Q000266:history / Q000295:instrumentation; D004867:Equipment Design; D004940:Esophageal Stenosis / Q000628:therapy; D049673:History, 20th Century; D006801:Humans; D015607:Stents / Q000266:history*