Diaphragm / cap
What is it and how does it work?
Barrier methods of contraception which, to be effective, must be used with a spermicide (a chemical that destroys sperm).
Vaginal diaphragms are flexible, circular, latex rubber domes, which fit inside the woman's vagina and cover the cervix. There are three types of vaginal diaphragm - flat, coil, or arcing spring. All varieties come in different sizes.
Cervical caps are smaller than diaphragms - new varieties of caps are becoming available made from silicone. There are three types of cervical cap - vault, cervical, or vimule. All varieties come in different sizes.
Both methods work by fitting inside the vagina and covering the cervix, whilst the spermicide kills any sperm.
How are they used?
Diaphragms or caps can be inserted at any time prior to sex. However, if more than 3 hours elapses between inserting the diaphragm or cap, and having sex, then extra spermicide (such as gel, cream or pessary) will need to be inserted. More spermicide needs to be inserted if you have sex a second time.
Diaphragms or caps must stay in for at least 6 hours after sex, but should not be left in for more than 30 hours (although some of the newer silicon devices can be left in for longer).
Where can you get them from?
A Family Planning Clinic and some GPs. They will examine you, help you to decide which type of diaphragm or cap is best for you, choose the right size, teach you how to use the device, and perform the initial fitting for you.
You will need to see a doctor or nurse every 6-12 months to check that your cap or diaphragm still fits. They will give you a new diaphragm or cap when you need one. You will probably need a different size diaphragm or cap if you put on or lose more than 3kg (7lbs/half a stone) in weight, have a miscarriage, abortion, or give birth to a baby.
How effective is it?
If they are used according to the instructions, diaphragms and caps are 92-96% effective.
Contacts
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Other forms of contraception:
Adapted from information produced by the FPA - www.fpa.org.uk
