1
Walsh Michael Adrian, Costigan Edward F: Multi-functional valve for use in the urethra. Costigan Edward F, March 19, 1974: US3797478 (158 worldwide citation)

A valve adapted to be positioned in the channel of the urethra for the maintenance of such channel at a predetermined size in a substantially sterilized condition relative to bacteria, such valve controlling the flow of urine from the bladder through the channel of the urethra to the atmosphere.


2
Walsh Michael Adrian, Costigan Edward F: Therapeutic dilator, disposable or reusable. Costigan Edward F, March 26, 1974: US3799170 (23 worldwide citation)

An insertible and expandable dilator for use on a singular therapeutic basis to dilate a body channel, duct or tubular organ such as the urethra.