Barrier contraception is 3 types: mechanical, chemical and combined.
Mechanical contraception. It includes products that prevent sperm into the uterus rug: condoms, cervical caps, diaphragms. Condoms are available in both male and female. The female condom is similar to the male on the principle of action, the differences are only in the appearance of the product and method of use. It is of cylindrical shape with two rings at the ends of one of the rings is worn on the cervix, the second output of the vagina. Female condoms as well as male and used only once. The advantage of condoms is that they not only prevent pregnancy, but also protect against sexually transmitted infections by.
Diaphragms, cervical (cervical) cap worn on the cervix before sexual intercourse. Their size is chosen individually in size and shape of the cervix. Before putting the diaphragm and cap filled with spermicide - a substance detrimental effect on sperm. Extracted data contraceptive methods after 6-8 hours after intercourse.
Pearl Index (an indicator of the possible percentage of pregnancy when using this method of contraception during the year) for the mechanical means is 4-20.
Chemical contraception. Based on the use of spermicides - substances that deplete the sperm cell wall that violate their mobility and lead to death. In addition to the contraceptive effect, spermicides protect him some sexually transmitted infections. Chemical contraceptives available in the form of aerosols, creams, gels, suppositories and vaginal tablets. They are inserted into the vagina before sexual intercourse. Pearl Index for chemical means of contraception is 6-20. Spermicides are rarely used on their own, usually in combination with mechanical contraception.
Combined contraception. Combines both chemical and mechanical. By means of contraception include combined contraceptive sponge. It is inserted into the vagina before sexual intercourse and is located in front of the cervix. Fiber sponge mechanically interfere with the promotion of sperm into the cervix, and spermicides, which are impregnated sponge itself, cause the death of sperm. Pearl Index for contraceptive sponge is 10-15.