vacuum extraction       
noun [ C or U ]  medical mainly US specialized uk/ˈvæk.juːm ɪkˌstræk.ʃən/ us/ˈvæk.juːm ɪkˌstræk.ʃən/ (UK usually ventouse)
 真空(胎头)吸引术,抽吸式分娩
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。 
 - More examples
 - He had had a difficult birth with vacuum extraction.
 - Forceps and vacuum extractions were identified as risk factors.
 - The mother in the room next door had a vacuum extraction.
 - A vitamin K shot is given in the event of a forceps or vacuum extraction delivery.