DAISe 1 Feasibility Study to Evaluate the DAISe Thrombectomy System for Acute Ischemic Stroke

• Age 18 years or older.
• Pre-stroke (24 hours prior to stroke onset) independent functional status in activities of daily living with modified Rankin Score 0-1. Patient must be living in their own home, apartment or seniors lodge where no nursing care is required.
• Diagnosis of acute ischemic stroke and referred to interventional neuroradiology center for mechanical thrombectomy with study enrollment time planned within 8 hours from onset of symptoms.
• Disabling stroke defined as a baseline NIHSS > 6.
• Thrombolytic therapy (IV tPA) received within 4.5 hours of onset/ last known well according to prescribed dosing OR documented ineligibility for thrombolytic therapy.
• Confirmed symptomatic, large vessel occlusion of the intracranial internal carotid artery, middle cerebral artery, M1, or M2 with mTICI 0-1.
• The following baseline imaging criteria should be met: MRI criterion- volume of diffusion restriction visually assessed ≤50 mL OR ASPECTs score 5-10 or T criterion- ASPECTS 6-10 on imaging NE-CT, CTA and/or CTP available
• Signed informed consent from patient or legal representative or if applicable, documented medical necessity for inclusion in a clinical study in an emergency followed by signed informed consent.
• Patient is affiliated in the social security system.

Exclusion Criteria:

• Computed tomography (CT) or Magnetic Resonance Imaging (MRI) evidence of recent/ fresh hemorrhage on presentation.
• Clinical history, past imaging or clinical judgment suggests that the intracranial occlusion is chronic.
• Rapidly improving neurological deficits based on the investigator's clinical judgement.
• Pregnancy; if a woman is of child-bearing potential and urine or serum beta HCG test is positive.
• Severe contrast allergy or absolute contraindication to iodinated contrast.
• Renal failure (serum creatinine level ≥ 3 mg/dL or on dialysis).
• Severe, sustained hypertension resistant to treatment (SBP >185 mmHg or DBP >110 mmHg).
• Use of warfarin anticoagulation (or other applicable anti-vitamin k anticoagulants) with International Normalized Ratio (INR) > 3.0 at the time of the procedure or any known hemorrhagic or coagulation deficiency.
• Use of a direct thrombin inhibitor within the last 48 hours; partial thromboplastin time (PTT) > 2.0 times the normal prior to procedure.
• Cerebral vasculitis or evidence of active systemic infection.
• Suspicion of aortic dissection, presumed septic embolus or suspicion of bacterial endocarditis.
• Clinical symptoms suggestive of bilateral stroke or occlusions in multiple vascular territories (e.g., bilateral anterior circulation, or anterior/posterior circulation).
• Seizure due to stroke.
• Difficult endovascular access, difficult aortic arch or severe neurovascular tortuosity that will result in an inability to deliver endovascular therapy.
• Evidence of dissection in the carotid or target artery for treatment.
• Presence of a carotid artery stenosis or occlusion requiring balloon angioplasty or stenting at time of the procedure.
• A severe or fatal comorbid illness that will prevent improvement or follow-up or that will render the procedure unlikely to benefit the patient.
• Patient cannot undergo an MRI of the head due to MRI contraindication.
• Patient is unable or unwilling complete follow up visits.
• If before the stroke, the patient is under a legal protective measure, they will not be able to participate in the study.