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These spiral urethral dilators are made of steel that takes the finest polish and they are heavily nickel-plated and polished. They are made in sizes 16-24, 18-28, 20-32, 22-36, 24-40, 26-44, 28-44 and 30-46, and are 9¾ inches long.
They are numbered so that the first numeral represents the approximate metallic circumference, the French scale being used for numbering sounds. The last numeral represents the approximate diameter of the outside spiral circumference. The 20-32 size has the actual metal as in a number 20 F standard sound, and the outside diameter of the spiral is about the size of a number 32 F sound.
Spiral urethral dilators were designed for the purpose of milking and massaging infected follicles and lacunae of the urethra. The surprising ease of introduction into the urethra when strictures were present stimulated me to make
Hayes O. SPIRAL URETHRAL DILATOR. JAMA. 1926;87(12):939-940. doi:10.1001/jama.1926.92680120001015