The climber broke his leg and had to be medevaced immediately by helicopter.

medevaced 是动词 medevac 的过去分词形式。medevac 是 medical evacuation（医疗后送）的缩写形式，由 medical（医疗的）和 evacuation（撤离、后送）组合而成，专指用直升机等交通工具紧急运送伤病员的行为。