The Gastric Bypass Stent System is intended to be used in weight loss treatment for obesity in patients with a BMI ≥ 30 kg/m2. In this clinical investigation the Sponsor seeks to demonstrate the safety and performance of the Gastric Bypass Stent System for its proposed indication in weight loss treatment for obesity in the European Union (EU) and United Kingdom (UK).

The Gastric Bypass Stent System is intended to be used in weight loss treatment for obesity in patients with a BMI ≥ 30 kg/m2. In this pivotal, prospective, multicenter, single-arm clinical investigation the Sponsor seeks to demonstrate the safety and performance of the Gastric Bypass Stent System for its proposed indication in weight loss treatment for obesity in the European Union (EU) and United Kingdom (UK). This clinical investigation will be used as an EU/UK bridging study and, with the ongoing clinical investigation in China (Protocol number: HZTG01), will be used to evaluate the safety and performance of the investigational device for the intended use.

Inclusion Criteria:

• Adult male and female aged 18 to 60 years old.
• Obese patients with BMI ≥ 30 kg/m2, who are willing to be treated with Gastric Bypass Stent System.
• Patients with American Society of Anesthesiologists (ASA) I~II grade. Exception: patients with BMI ≥ 40 kg/m2 may be included upon the Investigator's discretion if they have no other severe systemic disease.
• Able and willing to provide informed consent for participation in the clinical investigation and comply with all study procedures and assessments.

Exclusion Criteria:

• Have lost more than 4.5 kg in the past three months or have taken weight loss drugs in the past month.
• Patients with secondary obesity; a medical condition that has caused weight gain such as endocrine disorders and hypothalamic disorders.
• Chronic, daily use of systemic anti-inflammatory or corticosteroid medications (e.g., ibuprofen, prednisolone) for more than 1 week (not including low-dose aspirin for cardiac prophylaxis or inhaled corticosteroids).
• Patients with less than one-year continuous treatment before baseline with hypoglycemic drugs with known weight loss effects (e.g., GLP-1 agonists, SGLT-2 inhibitors, DDP-4 inhibitors).
• Patients diagnosed with type 1 diabetes.
• Patients with the function of islet β cell basically lost, C-peptide ≤ 1/2 of the normal low limit, or low and flat C-peptide release curve under glucose load.
• Patients with significant iron deficiency or iron deficiency anemia upon the Investigator's discretion.
• Patients with coagulation dysfunction and chronic, daily use of systemic anti-inflammatory or anti-coagulation medication in the past month (not including low-dose aspirin).
• Patients with severe liver and kidney dysfunction, and a serum creatinine concentration ≥ 180 μmol/L.
• Patients with Class III heart function of New York Heart Association Functional Classification (NYHA) or higher upon the Investigators evaluation.
• Patients with pulmonary dysfunction upon the Investigator's evaluation.
• Patients who have undergone Endoscopic Retrograde Cholangiopancreatography (ERCP) or have a history of cholecystitis or liver abscess.
• Patients with a duodenal ulcer, gastric ulcer, or previous and existing pancreatitis.
• Patients with gallstones (diameter ≥ 20 mm) with clinical symptoms.
• Patients with on-going thyroid dysfunction, not stabilized despite appropriate treatment.
• Patients with hemorrhage or potential hemorrhage in the digestive tract.
• Patients with gastrointestinal tract anomalies, such as gastrointestinal tract atresia, or other conditions that would result in failed placement in the gastrointestinal tract.
• Patients with a history of bowel obstruction or related diseases in the past year.
• Patients with a history of systemic lupus erythematosus or scleroderma.
• Patients with severe infections that are not controlled.
• Patients with poor general condition and having endoscopic contraindications (as evaluated by the Investigator).
• Pregnant women or planning to become pregnant.
• Patients with an alcohol dependence or substance abuse.
• Patients with unstable psychiatric disorders.
• Patients who are enrolled in another investigational study and have not completed the required follow-up period.
• Patients with an allergy to any of the components of the investigational device.
• Presence of helicobacter pylori resistant to medical treatment.
• Patients with any other conditions evaluated by the Investigators as unsuitable for participating in the clinical investigation