The goal of this clinical trial is to learn if non-invasive phrenic nerve stimulation works in adult acute cerebral infarction participants undergoing mechanical ventilation. It will also learn about the safety of non-invasive phrenic nerve stimulation. The main questions it aims to answer are：
1. Can non-invasive phrenic nerve stimulation shorten the duration of ventilator use and improve long-term prognosis?
2. What medical problems do participants have when taking non-invasive phrenic nerve stimulation? Researchers will compare non-invasive phrenic nerve stimulation to a sham stimulation to see if non-invasive phrenic nerve stimulation works.
Participants will:
1. Receive 14 days of non-invasive phrenic nerve stimulation or sham stimulation
2. Visit the clinic or call for follow-up at 90 days of onset