*2.1.4 Allegra valve*

Allegra (Biosensors, Singapore, Singapore, and New Valve Technology, Hechingen, Germany) has a tri-leaflet Nitinol stent roof made of bovine pericardium in the supra-annular position (**Figure 4**). The access way is transvascular. The delivery system includes three-stage release technology for implantation. Unlike other valves, the delivery system and valve are first placed toward the left ventricle. Then the valve starts to open from the middle part (Permaflow position). Because of low radial force, predilatation is recommended. In 2016 after the first results of the Allegra valve were positive, it received European Conformity, i.e., Conformité Européene (CE) approval in March 2017 [18, 19].
