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(二)对胎儿的影响1.动物实验: 为了明了胎头在真空牵出器的作用之下,会有怎样的变化,契恰娃氏等用刚出生的小狗进行实验(共28只小狗,其中3只作对照)。用于狗头上的特制像胶罩与胎儿用的罩子相似。在进行观察时要考虑到真空牵出器的作用原理,并使实验条件做得像胎儿从产母的阴道里通过一样。她们在不同的时间(从五分钟起到一小时)测验罩于在小狗头上的阴压作用;观察了全部实验狗的皮肤和皮下组织的充血情况。假使罩子放置到30分钟和以上,溢血是比较显著的,假使是放置5—6分钟,那就小得多。有几只实验狗的软脑膜和脑实质是血管郁血,但是这种变化也可见于对照的小狗。假使罩子的放置时
(B) the impact on the fetus 1. Animal experiments: In order to understand the fetal head in the role of the vacuum extractor, what will be the changes, Chiawa Wa and other experiments with a newborn puppy (a total of 28 small Dogs, of which 3 for control). A specially made mask for the head of a dog is similar to a mask for a fetus. In the observation to take into account the principle of the role of the vacuum extractor, and to make the experimental conditions as the fetus from the mother’s vagina through the same. At different times (from five minutes to one hour) they tested the effect of the cover over the puppies on the puppies and observed the hyperemia of the skin and subcutaneous tissue of all experimental dogs. If the cover is placed for 30 minutes and above, the bleeding is more significant, if it is placed 5-6 minutes, it is much smaller. Several experimental dogs had plexus and brain parenchyma blood vessels, but this change was also seen in control puppies. If the cover is placed