Bedford J M, Zelikovsky G
Fertil Steril. 1979 Oct;32(4):460-3. doi: 10.1016/s0015-0282(16)44305-0.
Ejaculates produced by 82 men between 6 and 19 days after removal of approximately 5 cm of vas deferens were assessed specifically for motility of residual spermatozoa. Several of 23 ejaculates produced 6 to 8 days after vasectomy still contained spermatozoa of the quality and number likely to produce pregnancy. By 13 to 15 days, however, all or the great majority of residual spermatozoa were dead, and in only 1 of 50 men were there numbers of motile spermatozoa possibly compatible with fertility. The results seem to justify more extensive surveys to confirm the absolute or biologic limits of the viability of spermatozoa in the terminal portion of the human male reproductive tract, anticipated here to be 16 to 18 days, as a suggested basis for a standard postvasectomy protocol. Second, these data support the choice of the 3rd postoperative week as the earliest rational moment to confirm the absence of motile spermatozoa, or in their presence to suspect an incomplete block.
对82名男性在切除约5厘米输精管后6至19天产生的射精样本，专门评估了残留精子的活力。输精管切除术后6至8天产生的23份射精样本中，有几份仍含有质量和数量可能导致怀孕的精子。然而，到13至15天时，所有或绝大多数残留精子已死亡，在50名男性中只有1名存在可能具有生育能力数量的活动精子。这些结果似乎表明有必要进行更广泛的调查，以确认人类男性生殖道末端精子存活的绝对或生物学极限，预计此处为16至18天，作为输精管切除术后标准方案的建议依据。其次，这些数据支持选择术后第3周作为确认无活动精子或存在活动精子时怀疑阻塞不完全的最早合理时间点。
