a method of helping a baby to be born using a device shaped like a cup, that is put over the baby's head and uses suction (= the removing of air) to pull the baby out of the mother's body

Some babies may need to be delivered by vacuum extraction. 有些婴儿可能需要用真空胎头吸引术才能生下来。

There was a rise in the number of vacuum extractions performed. 采用抽吸式分娩的数量有所增加。