ACURATE Neo™ TA Delivery System in Patient With Severe Aortic Stenosis

Inclusion Criteria: 1. Subject must be at least 18 years old 2. Severe aortic stenosis defined as: * Mean aortic gradient \> 40 mmHg or * Peak jet velocity \> 4.0 m/s or * Aortic valve area of \< 0.8 cm2 3. High risk patient determined by a multidisciplinary heart team consensus (cardiologist and cardiac surgeon) that patient is not a surgical candidate for conventional AVR due to risk factors such as STS Score (8% or higher) or other co-morbid conditions unrelated to aortic stenosis such as severe chronic obstructive pulmonary disease (COPD), chest deformities and irradiated mediastinum 4. NYHA Functional Class \> II 5. Multidisciplinary heart team (cardiologist and cardiac surgeon) consensus that the transapical approach is the most suitable access route for TAVI due to the presence of the following anatomic conditions: * porcelain aorta or * severely calcified or highly tortuous peripheral vasculature not appropriate for transfemoral transcatheter aortic valve implantation or * vessels too small for retrograde approach or * other anatomical conditions making transapical approach more suitable 6. Aortic annulus diameter from ≥ 21mm up to ≤ 27mm by CT or TEE 7. Patient willing to participate in the study and provides signed informed consent Exclusion Criteria: 1. Congenital unicuspid or bicuspid aortic valve or non-calcified 2. Extreme eccentricity of calcification 3. Severe mitral regurgitation (\> Grade 3) 4. Pre-existing prosthetic heart valve in any position and / or prosthetic ring 5. LV apex is not accessible via transapical access due to severe chest deformity 6. Previous surgery of the LV using a patch, such as the Dor procedure 7. Presence of apical LV thrombus 8. Calcified pericardium 9. Septal hypertrophy unacceptable for transapical procedure 10. Transesophageal echocardiogram (TEE) is contraindicated 11. ECHO evidence of intracardiac mass, thrombus, or vegetation 12. LVEF \< 20% by ECHO 13. Need for emergency intervention for any reason within 30 Days of scheduled procedure 14. Any percutaneous intervention, except for balloon valvuloplasty (BAV) within 1 month prior to implant procedure 15. Untreated clinically significant coronary artery disease requiring revascularization within 30 days before or after the study procedure 16. Acute myocardial infarction within 1 month prior to implant procedure 17. Previous TIA or stroke within 6 months prior to implant procedure 18. Active gastrointestinal (GI) bleeding within 3 months prior to implant procedure 19. Scheduled surgical or percutaneous procedure to be performed prior to 30 day visit 20. History of bleeding diathesis, coagulopathy, refusal of blood transfusions or severe anemia (Hb\<8 g/dL) 21. Systolic pressure \<80mmHg, cardiogenic shock, need for inotropic support or IABP 22. Primary hypertrophic obstructive cardiomyopathy (HOCM) 23. Active infection or endocarditis 24. Hepatic failure (\> Child B) 25. Chronic renal dysfunction with serum creatinine \> 3.0 mg/dL or renal dialysis 26. Neurological disease severely affecting ambulation, daily functioning, or dementia 27. Life expectancy \< 12 months due to non-cardiac co-morbid conditions 28. Intolerance to aspirin, clopidogrel, contrast media, or porcine tissue and allergy to nickel 29. Pregnant or breast-feeding women 30. For other severe illnesses of the patient (e.g. active carcinoma), the investigator shall decide on an individual basis whether the patient is not to be included in the study 31. Currently participating in an investigational drug or another device study