Birth Control Options for Women - Spermicidal and Barrier Contraception

There are three basic rim designs.

The Arcing Spring diaphragm applies strong pressure and easily flips into place. It is useful for women with weak vaginal muscles and for new users who are worried about incorrect placement.
The Coil Spring Rim is useful for women with strong vaginal muscles.
The Flat Spring Rim has a delicate rim and a gentle spring, and may be appropriate for women who have not had children.

Diaphragms come in different sizes and require a fitting by a trained health care provider. The health care provider also advises and prescribes the correct size of diaphragm for the user. Some women will need to be refitted with a different-sized diaphragm after pregnancy, abdominal or pelvic surgery, or weight loss or gain of 10 pounds or more. As a general rule, diaphragms should be replaced every one to two years.

Although the diaphragm has a relatively high failure rate, even with perfect use, it is considered a good choice for women whose health or lifestyle prevents them from using more effective hormonal contraceptives. Certain conditions of the vagina and uterus, a history of toxic shock syndrome, or a history of recurrent urinary tract infections, may disqualify a woman from using the device. The diaphragm should not be used if either partner is allergic to latex or spermicides.

Using and Inserting the Diaphragm. The diaphragm can be placed in the vagina up to one hour before intercourse and can be used even when a woman is menstruating. The following are general guidelines for insertion:

Before or after each use, the woman should hold the diaphragm up to the light and fill it with water to check for holes, tears, or leaks.
A small amount of spermicide (about one tablespoon) is usually placed inside the cup and some is smeared around the lip of the cup. Important Note: The use of spermicides with a diaphragm is under debate. It may not offer additional protection against pregnancy. It can increase the risk for urinary tract infections and does not protect against sexually transmitted diseases. Be sure to read the discussion of spermicides above.
The device is then folded in half and inserted into the vagina by hand or with the assistance of a plastic inserter.
The diaphragm should fit over the cervix, blocking entry to the womb.
If more than six hours pass before repeat intercourse occurs, the diaphragm is left in place and extra spermicide is inserted into the vagina using an applicator.
The diaphragm must remain in the vagina for six to eight hours after the final act of intercourse, and can safely stay there up to 24 hours after insertion.
The diaphragm should be washed with soap and warm water after each use and then stored in its original container, which should be kept in a cool dry place.