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In an effort to overcome the uncertainties of our present methods of treatment for ureteral calculi—waiting for the stone to pass spontaneously, ureteral dilatations and injections of oil, with the ever present possibility of permanent injury to the kidney, and perhaps final surgical intervention—I have devised an instrument which has been used successfully in a number of cases. This instrument gradually dilates and protects the ureteral wall while the stone is being extracted, thus minimizing trauma and reaction.
Figure 1 shows a flexible instrument consisting of five principal parts: a movable handle, a, connected to an inner or central wire, g, and with thumb in b, slides in a groove, c, opening the mesh of wires for reception of the stone; d is a spiral sheath through which the central or control wire connects with the filiform tip, f; tension made on a causes the mesh, e, to open; the
Councill WA. A NEW URETERAL STONE EXTRACTOR AND DILATOR. JAMA. 1926;86(25):1907–1908. doi:10.1001/jama.1926.26720510003013b
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