The FLARE-FT2 confirmatory study is a prospective, single-arm, multicenter study of the FlowTriever2 Catheter for mechanical thrombectomy of pulmonary embolism (PE).

The study is a prospective, single-arm, multicenter study to evaluate the safety and effectiveness of the FlowTriever2 Catheter for mechanical thrombectomy in patients eligible for endovascular treatment of acute pulmonary embolism (PE). The subjects who meet the inclusion/exclusion criteria will be enrolled in the study. The enrollment period is over a period of approximately 12 months. All study subjects actively participate through the 30-day visit (-5 / +15 days) following treatment. Study participation includes screening, baseline, treatment, 48-hour visit, and 30-day follow-up. The study population consists of subjects that have an acute PE. Subject eligibility is determined based on data available to the Investigator at the time of enrollment. Subjects must meet all inclusion and no exclusion criteria to be eligible for the study. All subjects that complete the procedure and the follow-ups are included in the analysis.

Inclusion Criteria:

• Clinical signs and symptoms consistent with acute PE
• PE symptom duration ≤ 14 days
• CTA evidence of proximal PE (filling defect in at least one main or lobar pulmonary artery)
• RV/LV ratio of ≥ 0.9 (NOTE: Enrollment qualification assessment based on Investigator's interpretation of RV/LV ratio)
• Systolic blood pressure ≥ 90 mmHg (initial SBP may be ≥ 80 mmHg if the pressure recovers to ≥ 90 mmHg with fluids)
• Stable heart rate < 130 BPM prior to procedure
• Patient is deemed medically eligible for interventional procedure(s), per institutional guidelines and/or clinical judgment.
• FlowTriever2 Catheter enters the vasculature

Exclusion Criteria:

• Thrombolytic use within 30 days of baseline CTA
• Pulmonary hypertension with peak pulmonary artery pressure > 70 mmHg by right heart catheterization
• Vasopressor requirement after fluids to keep pressure ≥ 90 mmHg
• FiO2 requirement > 40% or > 6 LPM to keep oxygen saturation > 90%
• Hematocrit < 28% (NOTE: hematocrit required within 6 hours of index procedure)
• Platelets < 100,000/μL
• Serum creatinine > 1.8 mg/dL
• INR > 3
• Major trauma Injury Severity Score (ISS) > 15
• Presence of intracardiac lead in the right ventricle or right atrium placed within 6 months
• Cardiovascular or pulmonary surgery within last 7 days
• Actively progressing cancer
• Known bleeding diathesis or coagulation disorder
• Left bundle branch block
• History of severe or chronic pulmonary arterial hypertension
• History of chronic left heart disease with left ventricular ejection fraction ≤ 30%
• History of uncompensated heart failure
• History of underlying lung disease that is oxygen dependent
• History of chest irradiation
• History of heparin-induced thrombocytopenia (HIT) Any contraindication to systemic or therapeutic doses heparin or anticoagulants
• Known anaphylactic reaction to radiographic contrast agents that cannot be pretreated
• Imaging evidence or other evidence that suggests, in the opinion of the Investigator, the Subject is not appropriate for mechanical thrombectomy intervention (e.g., inability to navigate to target location, predominately chronic clot, or non-clot embolus)
• Life expectancy of < 90 days, as determined by Investigator
• Female who is pregnant or nursing
• Current participation in another investigational drug or device treatment study

All AEs were followed by the Investigator until resolution or until the 30-day follow-up visit when the patient exited the study.

Collection of adverse events started after the time that the informed consent form was signed and the subject was enrolled. Adverse events were monitored throughout the study up until each patient's exit from the study.