Dr. McCarthy had an avid interest in diagnostic procedures and instruments. Among his best-known instruments are his foroblique lens that he designed with Reinhold Wappler of ACMI and a panendoscope for this lens system. His other instrument is based on the developments of Maximilian Stern and T.M. Davis and is still known as the Stern-McCarthy resectoscope. In 1941, Dr. McCarthy was awarded the Francis Amory Prize by the American Academy of Arts and Sciences for the development of such urologic instruments. His resectoscope led to the development of numerous modifications, all based on his design. It is still used in many places. Dr. McCarthy died January 21, 1965.