Vasectomy: Occluding the Vas Deferens,
the Pathway for Sperm

Vasectomy is a procedure that occludes the vas deferens — the pathway for sperm — to eliminate sperm from the semen, achieving permanent sterility.
Compared to other contraception methods, vasectomy has a pregnancy rate of only 0.02–0.2%, making it highly effective and safe.
The procedure does not affect testicular function or sexual performance, and to date, no clear adverse systemic effects such as increased risk of prostate cancer have been reported. Since sperm accounts for only a small fraction of semen volume, the amount of ejaculate does not significantly decrease after surgery.
If pregnancy is desired again after vasectomy, a vasovasostomy (vas deferens reversal) must be performed, but the pregnancy success rate is below 50%. As the occluded vas deferens degenerates over time, the likelihood of successful pregnancy decreases further. Reversal is most successful when performed within 4–5 years of the original procedure.

Expected Results and Prognosis
Without Surgical Treatment

Alternative contraceptive methods such as female sterilization, condom use, hormonal therapy, and withdrawal can be used. However, compared to vasectomy, these methods have a higher failure rate.

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