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

Inclusion Criteria:

• age ≥ 18 years old
• no gender restrictions
• patient diagnosed with acute cerebral infarction (within 30 days of onset) through cranial CT or MRI
• duration of mechanical ventilation ≥ 24 hours
• patient or their legal guardian agrees to participate in the study and signs an informed consent form

Exclusion Criteria:

• there are other significant conditions that affect diaphragm function, such as severe malnutrition, irreversible respiratory pump failure caused by medullary or cervical cord injury, and irreversible damage to the phrenic nerve
• significant agitation cannot be combined with transcutaneous electrical phrenic nerve stimulation
• severe skin damage or infection at the electrode placement site
• previous presence of severe lung disease (such as severe COPD, interstitial lung disease, pulmonary embolism, etc.), severe heart failure (NYHA Class IV)
• sepsis or shock requiring high-dose vasopressors
• the terminal state of the disease or expected survival period does not exceed 7 days
• pacemaker implantation
• pregnant or lactating women
• patients whose family members express their willingness to withdraw for treatment

After the research is completed and the results are published, the project leader can be contacted to obtain the original data.