Text Appearing Before Image: ygarthdevised similar instruments in 1825. In all theseearly lithotrites, however, the shafts were insecurelyfastened together, and force which could be safelyapplied was not sufficient for the purpose of break-ing the stone. In 1830, Jacobson, of Copenhagen, introduced alitliotrite which had one solid blade and one bladearticulated like a chain-saw. The stone was to becaught in the loop made between these two, andcrushed by screw force drawing the articulated blade down on to thesolid one. This instrument, while useful for small stones, proved in-sufficient for large ones, and with it it was difficult to find and seizefragments after the first crushing. In 1832 Heurteloup brought out his lithotrite, called a, percuteur, in Fig. 15.—Weiss.s firstlithotrite. LITHOTRITY. 669 which the force was applied by the blows of a hammer. The blades inthis instrument were practically like those of Weisss and Retores litho-trites, but the shaft was somewhat differently arranged for the purpose of Text Appearing After Image: Fig. 16.—Jacobsons lithotrite, open and shut. giving more strength. The shaft was made of three pieces, the outerones of which were attached to the female blade, and the middle one,which slipped to and fro between them, carried the male blade. The twooutside pieces of the shaft were joined in the lower part by a cross-rivet,and in the shaft of the male blade was a long slit through which thisrivet passed, which was designed to prevent the riding up of the male
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