通过随机研究比较金属与硅胶两种胎头吸引器的效力和可能发生的并发症并着重观察发生新生儿视网膜出血的情况。 选择100例符合下列标准,并需要行器械助产的对象:妊娠≥37周、活的单胎、胎膜已破、宫口开全的低位或中位顶先露。随机分为两组:一组采 We compared the efficacy and potential complications of both metal-silica gel head suctioners with randomized studies and focused on the observation of neonatal retinal hemorrhage. Choose 100 cases meet the following criteria, and the need for mechanical midwifery objects: ≥ 37 weeks of pregnancy, single-child live, fetal membranes have been broken, cervix open low or median top first exposed. Randomly divided into two groups: a group of mining