Question

Which is not included in barrier methods of birth control?
A. Diaphragm
B. Lippes loop
C. Cervical cap
D. Vault.

Answer 1

Barrier methods work by stopping sperm from entering the vagina. It is a small coil like birth control device, which is inserted into a woman's uterus to prevent implantation.
Complete answer:
To answer this question, first, we need to know about the barrier methods of birth control. Barrier methods of birth control function as barriers to keep the male sperm from sticking to the female egg. Some barrier methods defense against STIs (sexually transmitted infections). Some barrier methods such as spermicide, condom, and sponge can be found in most medical stores. Others like diaphragm and cervical caps must be prescribed by a doctor.
Now, let us find the solution from the option.

Diaphragm, Cervical cap, Vaults are mechanical barriers which inhibit fertilization by stopping the entry of sperms via the cervix.
Lippes loop are unmedicated intrauterine devices which develop phagocytosis of spermatozoa within the uterus.

Thus, the correct option is B. i.e. Lippes loop.

Note: The Lippes loop was a flexible polyethylene plastic loop with a trapezoidal shape that Dr Lippes believed fit closely to the contours of the uterine cavity, to reduce the risk of expulsion. This device was first supplied in 1962 and instantly it became the most commonly prescribed IUD in the US.