What is the difference between a diaphragm, cervical cap and vault cap? They seem to do the same thing i.e. cover the cervix to prevent sperms from reaching the ovum. How are
![The "Spring rim" Dutch cap pessary' contraceptive diaphragm - Faculty of Medicine, Dentistry and Health Sciences Museums at The University of Melbourne The "Spring rim" Dutch cap pessary' contraceptive diaphragm - Faculty of Medicine, Dentistry and Health Sciences Museums at The University of Melbourne](https://collections.mdhs.unimelb.edu.au/records/images/xlarge/3169/82e54cf56f044d864e9650bf06efb3da40e830a3.jpg)
The "Spring rim" Dutch cap pessary' contraceptive diaphragm - Faculty of Medicine, Dentistry and Health Sciences Museums at The University of Melbourne
![310+ Cervical Cap Stock Photos, Pictures & Royalty-Free Images - iStock | Cervical cap birth control 310+ Cervical Cap Stock Photos, Pictures & Royalty-Free Images - iStock | Cervical cap birth control](https://media.istockphoto.com/id/1393065648/photo/diaphragm-vaginal-contraceptive-cap-spermicide-contraception.jpg?s=612x612&w=0&k=20&c=2oK-vcvqSbi4dydfVkdHtORbt_x3nT6COw6HOa3ICxU=)