An implantable frame to form a vessel wall of an artery, the implantable frame comprising: a plurality of neighboring longitudinal struts joined with a plurality of transverse members (113, 115, 117) so as to define one or more openings (116, 118) extending between the plurality of neighboring longitudinal struts; a plurality of connecting members (120, 130) extending from the plurality of neighboring longitudinal struts to define a plurality of windows sized to enhance pulsatility of the wall; and a plurality of corner structures connected and supported by the connecting members (120, 130), wherein each corner structure comprises a plurality of the neighboring longitudinal struts joined with the plurality of transverse members (113, 115, 117) to define openings (116, 118) of the corner structure, the plurality of longitudinal struts and the transverse members (113, 115, 117) defining a first opening and a second opening and the plurality of longitudinal struts comprising at least two neighboring longitudinal struts; wherein, in use, the frame comprises a longitudinal axis substantially aligned with a longitudinal axis of the vessel in which it is placed, the frame defining an opening through which blood can flow and pulsate the vessel wall, the plurality of windows extending around an outer boundary of the frame in order to shape the vessel wall, wherein the shape of each window is defined by the plurality of corner structures, a first plurality of the connecting members on a first end of the frame and a second plurality of the connecting members of a second end of the frame opposite the first end, each of the corner structures being oriented with respect to the connecting members so as to define a plurality of angles of the connecting members, the angles being the same or different to define a polygonal cross-section having three to five sides, wherein the windows are shaped to receive at least a portion of the vessel wall within the window during diastole and to allow at least a portion of the wall framed by the window to move outside a plane of the window during systole in order to increase pulsatility and enhance stimulation of baroreceptors of at least the portion of the vessel wall framed by the window. a plurality of neighboring longitudinal struts joined with a plurality of transverse members (113, 115, 117) so as to define one or more openings (116, 118) extending between the plurality of neighboring longitudinal struts; a plurality of connecting members (120, 130) extending from the plurality of neighboring longitudinal struts to define a plurality of windows sized to enhance pulsatility of the wall; and a plurality of corner structures connected and supported by the connecting members (120, 130), wherein each corner structure comprises a plurality of the neighboring longitudinal struts joined with the plurality of transverse members (113, 115, 117) to define openings (116, 118) of the corner structure, the plurality of longitudinal struts and the transverse members (113, 115, 117) defining a first opening and a second opening and the plurality of longitudinal struts comprising at least two neighboring longitudinal struts; wherein, in use, the frame comprises a longitudinal axis substantially aligned with a longitudinal axis of the vessel in which it is placed, the frame defining an opening through which blood can flow and pulsate the vessel wall, the plurality of windows extending around an outer boundary of the frame in order to shape the vessel wall, wherein the shape of each window is defined by the plurality of corner structures, a first plurality of the connecting members on a first end of the frame and a second plurality of the connecting members of a second end of the frame opposite the first end, each of the corner structures being oriented with respect to the connecting members so as to define a plurality of angles of the connecting members, the angles being the same or different to define a polygonal cross-section having three to five sides, wherein the windows are shaped to receive at least a portion of the vessel wall within the window during diastole and to allow at least a portion of the wall framed by the window to move outside a plane of the window during systole in order to increase pulsatility and enhance stimulation of baroreceptors of at least the portion of the vessel wall framed by the window.