The contraceptive diaphragm is a latex or silicone cup placed on the cervix to prevent sperms from entering the uterus. Once the device is coated with a water-based gel from the inside, it will be at its most effective state, blocking and killing sperms.
There are no currently no data in Canada on the effectiveness of the contraceptive diaphragm and gel sold in the country. Previous studies shows that the use of contraceptive diaphragm with its spermicide gel (no longer offered in Canada) has a better higher failure rate than all the other contraceptive methods.