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发表于 2016-1-24 14:46:40 | 显示全部楼层 |阅读模式

  生命的孕育是一个奇妙的过程。人类的卵子与精子结合,如果是正常受孕,那就是一场充满了机会的竞争。女性每个月排出一个卵子,在输卵管里等待精子长途跋涉与它相遇,卵子接受精子进来与它结合,形成受精卵后会由输卵管将其输送到子宫腔内,受精卵在宫腔内漂浮 2-3天后着床生长发育,直至足月分娩。(受精卵在输卵管内一边发育一边逐渐向子宫腔移动,大约在受精后7-8天,即可到达子宫腔植入到子宫内膜里,并不断地吸取营养逐渐发育成熟的胎儿。)

  正常的精子具有非常好的活动能力,能够顺利进入女性体内,(精子依靠尾部摆动向子宫游弋,然后再进入输卵管。但极大部分精子有阴道酸性环境中失去活力或死亡,只有极少数精子能够克服重重阻力到达输卵管,在放射冠的阻碍下也会牺牲一部分健康精子。所以,只有足够数量的健康精子才能完成受孕过程),其次,但是卵子的存活时间只有 1-2天,精子的存活时间为 3天左右,因此要选择适当的时机同房才有受孕的可能。

  在正常生理情况下,夫妇如果不采取避孕措施,每个月受孕的机会为 10-20%,半年怀孕的机会约为 70%,一年怀孕的机会约为 80%,因此,即使是一对没有任何生育障碍的夫妇,也并非想怀孕就马上能够如愿的。医学上认为如果超过一年以上未采取避孕措施而不孕的,就应进行医学检查。

  不孕症的发生率约占生育年龄妇女的(育龄夫妻的) 8-17%,近年随着环境污染、工作压力等原因,这一数据还在不断呈上升的趋势。不孕病因以女方较为常见,约 30-40%仅与女性一方有关,约 10-30%仅与男性一方有关,另有 15-30%的病例夫妻双方都可检查出异常。

  日益严峻的生育状况下,人们迫切寻求突破!!

  1978年世界上第一个试管婴儿在英国诞生,是steptoe博士和Edowrds教授共同研究的成果,被称为人类医学史上的奇迹,Edowrds教授也因此在2010年获得诺贝尔医学奖。

  第一代试管婴儿 IVF技术(In Vitro Fertilization)是将精子和卵子放在同一个培养基中,让它们自然结合,即所谓的“常规受精”,但由于技术、科技等各种条件的限制,试管婴儿成功率并不高;然而,从 1978年至今,辅助生殖技术的发展已经有了三十几年的历史,至今已经发展为第三代试管婴儿基因筛查诊断的时代,试管婴儿成功率也得到了“质”的飞跃。
发表于 2017-11-27 21:36:38 | 显示全部楼层

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