Davies A H, Sharp R J, Cranston D, Mitchell R G
Elliot Smith Clinic, Churchill Hospital, Oxford.
Br J Urol. 1990 Aug;66(2):211-2. doi: 10.1111/j.1464-410x.1990.tb14907.x.
Between 1980 and 1985, 6067 out-patient vasectomies were performed under local anaesthesia at the Elliot Smith Clinic in Oxford. During this period 151 men (2.5%) were given a "special clearance". This sanctioned the discontinuation of other forms of contraception despite the persistence of scanty (less than 10,000/ml) sperm in 2 consecutively examined semen samples at least 7 months after vasectomy. These men have been reviewed and further specimens of semen requested after a minimum follow-up of 3 years (range 3-8); 50 patients supplied a specimen and all except 1 were azoospermic. No pregnancies attributable to failure of the vasectomy have been identified.
1980年至1985年间，牛津的埃利奥特·史密斯诊所对6067名男性进行了局部麻醉下的门诊输精管切除术。在此期间，151名男性（2.5%）获得了“特殊许可”。这使得他们在输精管切除术后至少7个月连续两次检查的精液样本中仍存在少量精子（少于10000/ml）的情况下，得以停止使用其他避孕方式。对这些男性进行了复查，并在至少3年（3至8年不等）的随访后要求提供进一步的精液样本；50名患者提供了样本，除1人外其余均无精子。未发现因输精管切除术失败而导致的妊娠情况。
