a device shaped like a cup, used to help a baby be born by putting it over the baby's head and using suction (= removing air) to pull the baby out of the mother's body

As the baby's heart rate began to drop, my obstetrician had to use a ventouse to suck him out. 由于宝宝的心率开始下降，产科医生不得不用真空吸出器把他吸出来。

the use of this device when a baby is being born

Three of these babies had normal births, one had a traumatic ventouse and five were delivered by forceps. 这些婴儿中有三个是正常分娩，一个创伤性真空吸出，另外五个是用产钳分娩的。

The baby was born 10 hours later by ventouse. 10小时后，婴儿采用真空吸出分娩。

It may become necessary to use forceps or even a ventouse delivery. 有可能需要采用产钳，甚至真空吸出分娩。