Types
Several brands of caps were manufactured during the late 20th and early 21st centuries. They can be divided into two types: cavity rim caps, and other caps. Cavity rim caps adhere to the cervix, while other caps adhere to the vaginal walls around the cervix.
The cavity rim caps are Prentif, made of latex, and the disposable cap Oves, made of silicone. There are four sizes of Prentif: 22, 25, 28, and 31 mm. There are three sizes of Oves: 26, 28, and 30 mm. Unique among cervical caps, it adheres to the cervix by surface tension, rather than by suction.
The other devices are the latex Dumas and Vimule, and the silicone FemCap, Lea's Shield, and Shanghai Lily. There are five sizes of Dumas: 50, 55, 60, 65, and 75 mm. There are three sizes of Vimule: 42, 48, and 52 mm. There are three sizes of FemCap: 22, 26, and 30 mm. There are four sizes of Shanghai Lily: 54, 58, 62, and 66 mm. Lea's Shield is manufactured in a single size. Unlike the other caps, Lea's Shield has a one-way air valve that helps it seal to the vaginal walls. The valve also allows the passage of cervical mucus. FemCap does not have such a valve and as such can be used to collect cervical mucus to support the billings method. Both Lea's Shield and FemCap have loops to assist in removal.
Shanghai Lily is only available in China. As of 2008, many of the other devices are no longer being manufactured: Prentif, Vimule, and Dumas have been discontinued. Oves is only being sold as a conception cap, not as a birth control device. As of February 2009, FemCap was the only brand of cervical cap available in the United States. FemCap is also available in the UK via the NHS on prescription and is often distributed free from Family Planning Clinics depending on the health authority. Lea's Shield is only available as the German brand LEA contraceptivum.
Read more about this topic: Cervical Cap
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