GWD7-Q3,请问这句中的“put through triage ”做什么成分

GWD7-Q3:

The state has proposed new rules that would set minimum staffing levels for nurses, rules intended to ensure that at least one nurse is assigned for every four patients put through triage in a hospital emergency room.

题干就是正确的，请问划线部分中put through triage 是什么成分？谢谢！