512456-A is referenced by 38 patents.
512,456. Dilating instruments. SADILKOVA, H. March' 9, 1938, No. 7319. [Class 81 (ii)] An appliance for treating body cavities or constrictions therein by dilatation comprises a thin expansible rubber tube B, closed at one end and connected at the other through a valve E to a source of fluid pressure, a thin, preferably removable wire stiffener A, having a terminal bead B, enclosed within tube B, an outer elastic-tubular envelope D, and an intermediate locally expansible envelope C tubular in collapsed condition as shown, the outer envelope D having graduations thereon to facilitate accurate positioning of the appliance in the body.; The part C may be of non-elastic material having one or more widened expansible parts R which collapse into folds on removal of internal pressure ; alternatively it may be of elastic material the walls of which are of unequal thickness or are locally stiffened by fabric layers. The pressure source may be connected through a length of tubing and a pressure gauge may be provided.