Editing Cervical cap (section)

==Design==
===Height of dome===
The dome of a cervical cap may be low with little air space between the dome and the cervix, or high with plenty of air space above the cervix enclosed under the dome.  Stopes recommends the high dome type for the following reasons: 1. The high dome cap has room to store secretions from the uterus such as menstrual flow or flow possibly resulting from an orgasm.  2. The high dome cap is allegedly less likely to become dislodged should the penis push hard against the cervix.{{sfn|Stopes|1924|pp= 151-4}}

===Rim===
Per Stopes (in the 1920s) they should be made of very pliable soft rubber which should not be wrinkled or withered.

Caps of the 1920s had three types of rims: solid rubber (like an o-ring), air-inflated rubber, or a spring encased in rubber. Stopes recommended the all-rubber cap with the solid rubber rim{{sfn|Stopes|1924|pp=150–1, 156}}  There is also the question as to what is the best shape of the rim cross-section so that the penis is less likely to dislodge the cap by contact with the rim.  Some caps such as the Prorace, advocated by Stopes, had a wide but flat thin rim so that a penis contact would tend to push the rim against the fornix which it is already resting against.<ref>See the diagram in Chalker2, p. 78, of the penis wedging itself between the vagina and the side of the cervix while making contact with the rim.</ref>

===Stopes recommendations===
The type of rim cap recommended by Stopes in the 1920s with a high dome of thin rubber was experimentally revived by Lamberts in England in 1981<ref>Chalker2, pp,174-5</ref> and called the "test cap". It came in six sizes and its light weight meant that it was not as apt to be felt during sexual activity. It was not received well. Some thought it was too flimsy and more likely to dislodge, but Stopes had (in the 1920s) claimed just the opposite for this design, as did the director of a woman's health center who tried it out.