In 1889, he published the first textbook of cystoscopy. The year 1887 had seen the development of the Edison light bulb and the continuation of improvements in endoscopic instruments. It was several years before Nitze agreed to incorporate the small new light bulb of Henry Koch and Charles Preston into his cystoscope. He continued to develop the irrigation cystoscope, the photocystoscope and the operating cystoscope in collaboration with the instrument makers Hartwig, Loewenstein, Hirschmann and Heyneman. In 1894, he published the first atlas of cystoscopy. In 1902, the AUA was founded and Nitze became an honorary member. Two years later, on the silver anniversary of the first live demonstration of the cystoscope, he was showered with letters of recognition from around the world. He died from a stroke in 1906.