Minimally Invasive Mitral Valve Replacement with Brim

A collapsible-expandable tubular stent (29) constructed of shape-memory material which is implantable into a human heart, which comprises:

• proximal and distal rings (71, 73) and at least two spaced apart posts (69) that extend axially between said rings (71, 73);
• said distal ring (73) comprising a plurality of distal arms (77) which are connected to the distal ring (73) at only one end of the arm and which have a free opposite end;
• said proximal ring (71) comprising a plurality of proximal arms (75), which are connected at only one end of the arm to the proximal ring (71) and which have a free opposite end, which proximal arms (75) are constructed to swing radially outward at their free ends or to move radially outward, in particular when first put in parallel with a longitudinal axis of the tubular stent (29) by means of an radially inwardly acting force with the force then being released, or to exert from the longitudinal axis of the tubular stent (29) by an angle of preferably about 70° or between 60° and 105° , more preferably between 60° and 85°.