Friday 22 November 2013

Barrier contraceptives - Occlusive caps part - 2

2.Cervical cap:


The cervical cap is a thimble or dome shaped rubber appliance designed to cover the cervix, they remain in place by suction. Conventional caps can be worn up to 48 hrs.
They are usually made of latex, must be fitted by a provider at first time and can be difficult to insert or remove.
Cervical caps are available in four sizes between 22mm to 31mm.

Two new cervical caps are under development.
Female cap:

The first one is called fem cap, made of silicone, worn up to 48 hrs. Shaped like a hat with an upturned brim that lies against the vaginal walls around the cervix.
It is easier to insert than conventional caps.
And there will be no pressure on urethra, unlike conventional diaphragms.
A strap is added to facilitate removal.
And uses less spermicidal jelly, so less irritation.
But it is less effective than conventional cap with failure rate of 23 %, whereas conventional cap failure rate is 18 %.

Oves cap:
Second new cervical cap is oves cap, made of silicone, can be left in place for three consecutive days. Equipped with removal loop and it is disposable after one use.


3.Vault cap:
It is a hemispherical, dome shaped rubber or plastic cap.
Which fits into vaginal vault covering the cervix.
Rim will be thick but have no metal spring.
The sizes ranges from 50 to 75 mm in 5 mm steps.
Correct size for a particular woman is smallest one which fits evenly into the vaginal vault.
Eg: Dumas cap, Plastic dumas cap.

 4.Vinule cap:
It is a cervical cap made up of rubber, with fairly rigid flanged base to increase the degree of suction, when cap is put in place. String will be attached for easy removal.
It is useful in case of cystocele & mild prolapse cases when diaphragm can't be retained.
This is a good advantage of vinule cap.
Vinule cap sizes from 45 to 55 mm in 3 mm steps.

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