The first-phase study is a prospective, single-group observational study. It plans to recruit patients with in-stent restenosis caused by poor stent expansion in the coronary artery. The intravascular shock wave treatment device and the disposable coronary intravascular shock wave catheter produced by Shanghai Lifan Boyuan Medical Technology Co., Ltd. will be used for treatment. This is a clinical trial to verify the feasibility, preliminary safety and effectiveness of treating in-stent restenosis caused by poor stent expansion in the coronary artery.
The second-phase study is a prospective, multicenter, randomized controlled clinical trial is planned to recruit patients with in - stent restenosis caused by poor coronary stent expansion. These patients will be treated with either the intravascular shock wave treatment device and the disposable coronary intravascular shock wave catheter produced by Shanghai Lifan Boyuan Medical Technology Co., Ltd., or a non - compliant balloon dilation catheter (Shandong JW Medical Products Co., Ltd., National Medical Device Registration No. 20213031019). The purpose is to verify the safety and effectiveness of the investigational medical devices in treating in - stent restenosis caused by poor coronary stent expansion.
Aged between 18 and 80 years old, either male or non - pregnant female.
Suffering from heart diseases with clinical evidence of ischemia, such as Chronic Coronary Syndrome (CCS) or Acute Coronary Syndrome (ACS).
The subject should be able to understand the purpose of the trial, voluntarily participate in it, and sign the informed consent form.
During the baseline surgery, at most one target lesion can be treated.
Patients who have had any myocardial infarction within 1 week, or patients who have had a myocardial infarction more than 1 week ago but whose myocardial enzymes CK or CK-MB have not yet returned to normal.
Patients with New York Heart Association (NYHA) class III or IV heart failure or those with severe valvular heart disease.
Female patients who are planning to become pregnant (or are breastfeeding).
Severe impairment of liver and kidney function, with transaminase levels more than 3 times the upper limit of the normal value, serum creatinine > 2.5 mg/dL (221 μmol/L), or chronic renal failure requiring long-term dialysis.