A collapsible and expandable stent (320) extends in an axial direction from a proximal end to a distal end. The stent may include a plurality of first cells (324), each first cell having an open space defined by a first plurality of struts (322). The stent may further include a second cell (330) nested in the open space of one of the first cells, the second cell being defined by a second plurality of struts (330a-d). The stent may additionally include first and second connecting struts (332, 334) connecting the second cell to the one first cell. The second cell may be configured to pivot about the first and second connecting struts with respect to the one first cell. The pivoting may create a clearance space between the second cell and an outer perimeter of the stent in which portions of a native valve structure may be clamped.