The stent is usually inserted with the aid of a cystoscope. Decker had his culdoscope made by American Cystoscope Makers (ACM). It is carried out with a cystoscope. The scope may be a cystoscope, ureteroscope, renoscope or nephroscope. Prior to this, limited diagnostic procedures were done using variations on the cystoscope since 1910. Stents without a thread are removed by a doctor using a cystoscope. The cystoscope has lenses like a telescope or microscope.