The goal are complished by eg: oral contraceptives, implantable rods, long acting progensterone injection eg:condom diaphragm, foam, rhythm, implantable rods eg: intrautering devices, diethylstibestrol, postcoital oral contraceptive, and inducing menstruation or abortion Each approach may be used successfully,individually or in combination,to prevent pregnancy,and each method has its own unique advantages and disadvantages.
Medroxyprogesterone acetate (Depo-Provera)
detumescence
Levonorgestrel (Mirena) lifespan is 5 years Copper TCu380A (Paragard) lifespan is more than 10 years
Expulsion 排出
. It is thought that the human ovum can be fertilized no later than 24 to 48 hours after it is extruded from the ovary. Although motile sperm have been recovered from the uterus and the oviducts as long as 60 hours after coitus, their ability to fertilize the ovum probably lasts no longer than 24 to 48 hours. Pregnancy is unlikely to occur if a couple refrains from intercourse for 4 days before, and for 3 or 4 days after, ovulation (fertile period) Unprotected intercourse on the other days of the cycle (safe period) should not result in pregnancy. Ovultation usually occurs about 14days (12 to 16) before the onset of menstruation
refrains from 忍住,戒除,克制不要
Followed by a second dose 12 hours later
The right fallopian tube is grasped with the clip The clip is closed and the tube is crushed The clip is closed and locked across the tube