Historical information
The wings of the pessary are controlled by two small hinges and the screw at the base of the metal stem. These wings can be opened or closed by turning the screw clockwise or anticlockwise.
Physical description
Zwanke's intrauterine stem pessary. Consists of two black vulcanite wings, a stem, and a screw. Each wing has a 2cm hole in it. Wings are divided by two small metal screws and at the base of each wing are three metal studs. Stem is made up of three curved metal prongs. Screw is made of bone.
