The MASA Valve Early Feasibility Study (MVEFS) multi-site interventional clinical trial within the United States of America with each center following a common protocol.The objective of the trial is to evaluate the safety and probable benefit of MASA Valve in the indicated subset of patients requiring Right Ventricular Outflow Tract Reconstruction (RVOTR). As an early feasibility study, the purpose is determine the feasibility of success of the device in order to gather early data towards a future pivotal study and/or regulatory clearance submission.

The MASA Valve is a bi-leaflet pulmonary valved conduit. The MASA Valve has an ePTFE conduit and ePTFE leaflets fixtured to the conduit with polypropylene suture. The device has a pad-printed design on the outer conduit surface indicating the valve position and direction of flow. .

The MASA Valve is intended to be used to reconstruction the Right Ventricular Outflow Tract (RVOT) and provide a functional pulmonary valve. Once implanted, the MASA Valve provides a pathway for blood from the Right Ventricle (RV) to the Pulmonary Arteries (PAs), while the integrated valve helps to prevent backflow into the RV. The MASA Valve Indications for Use are:

The MASA Valve pulmonary valved conduit is indicated for correction or reconstruction of the right ventricular outflow tract (RVOT) in patients aged less than 22 years with any of the following congenital cardiac malformations:

• Pulmonary Stenosis
• Tetralogy of Fallot
• Truncus Arteriosus
• Transposition of Great Vessels
• Pulmonary Atresia

In addition, the MASA Valve is indicated for the replacement of previously implanted, but dysfunctional, pulmonary valves, valved conduits or conduits, as well as for use in the Ross Procedure when the native RVOT is being used to reconstruct the Aorta.

Treatments currently available for the above-stated conditions include biologic-tissue-based valved conduits (Homografts and Contegra Glutaraldehyde-fixed Bovine Jugular Vein), Intra-operatively constructed valved conduits made from off-the-shelf vascular grafts and cardiovascular membranes, and non-valved cardiovascular conduits. Based on existing evidence it is believed the potential benefits of MASA Valve outweigh the potential risks.

Inclusion Criteria:

1. At least one of the following: Right Ventricular to Pulmonary Artery mean gradient > 35mm Hg, moderate or severe Pulmonary regurgitation (≥3+), or clinical indication for replacement of their native or prosthetic pulmonary valve with a prosthesis.
2. Age < 22 years
3. Patient is geographically stable and willing to return for 1 year follow-up for the trial.
4. Patient's legal guardian should be willing to provide informed consent (IC) at the hospital location where they are being enrolled.
5. The patient, and the patient's parent / legal representative where appropriate, and the treating physician agree that the subject will return for all required post-procedure follow up visits and the subject will comply with clinical investigation plan required follow-up visits.

Exclusion Criteria:

1. Patient is in need of or has presence of a prosthetic heart valve at any other position
2. Patient has a need for concomitant surgical procedures (non-cardiac)
3. Patients with previously implanted pacemaker (including defibrillators) or mechanical valves
4. Patient has an active bacterial or viral infection or requiring current antibiotic therapy (if temporary illness, patient may be a candidate 4 weeks after discontinuation of antibiotics)
5. Patient has an active endocarditis
6. Leukopenia, according to local laboratory evaluation of white blood cell count
7. Acute or chronic anemia, according to local laboratory evaluation of hemoglobin Patients can be transfused to meet eligibility criteria
8. Thrombocytopenia, defined as Platelet count < 150,000/mm3 Patients can be transfused to meet eligibility criteria
9. Severe chest wall deformity, which would preclude placement of the PV conduit
10. Known hypersensitivity to anticoagulants and antiplatelet drugs and to the device materials
11. Immunocompromised patient defined as: autoimmune disease, patients receiving immunosuppressant drugs or immune stimulant drugs
12. Patient has chronic inflammatory / autoimmune disease
13. Need for emergency cardiac or vascular surgery or intervention
14. Major or progressive non-cardiac disease (liver failure, renal failure, cancer) that has a life expectancy of less than one year
15. Currently participating, or participated within the last 30 days, in an investigational drug or device study
16. Alcohol or drug abuse as defined by DSM IV-TR criteria for substance abuse - this includes the illicit use of cannabis within the last 12 months
17. Patient has medical, social or psychosocial factors that, in the opinion of the Investigator, could have impact on safety or compliance

Only anonymized data is intended to be shared with other clinicians.