陈凤林教授指出：传统的宫颈环扎是怎么做的?传统的宫颈环扎是在妊娠20周左右将宫口用丝线环扎，缺陷是缝扎的只是外口,一旦宫缩发动,不能有效阻止宫颈扩张,且易诱发宫缩而流产，缝扎后还容易引起宫颈管感染，导致胎膜早破流产，成功率不足20%左右。

　　Professor Chenfenglin pointed out: traditional cervix is how to do? The traditional cervix ring is to tie the mouth of the palace with silk thread around 20 weeks of pregnancy. The defect is that the incision is only external. Once the contractions are started, they can not effectively prevent the expansion of the cervix, and they can easily induce contractions and miscarriages. It is also easy to cause cervix infection. Causes the fetal membrane to break early miscarriages, the success rate is less than 20 %.