An implantable medical stent system, comprising: a radially expandable stent comprising a filamental structure chosen from a metal or metal alloy in a pattern surrounding a bore to form a substantially tubular wall along a length relative to a longitudinal axis; wherein the filamental structure comprises at least one high strain region and at least one low strain region along the pattern; wherein the filamental structure comprises a material strain distribution under deflection force of lateral bending or radial expansion relative to the longitudinal axis that is principally locally concentrated along the high strain region; wherein the low strain region comprises at least one of (a) a width in a circumferential plane around the longitudinal axis that is substantially greater than a width of the high strain region along the longitudinal axis, (b) a width that is substantially greater than a radial thickness at the respective low strain region, and (c) a substantially increased radiopacity versus the high strain region. characterised in that the filamental structure pattern further comprises a plurality of adjacent circumferential segments surrounding the bore and that are provided in series along the length; and wherein the filamental structure pattern of each segment comprises a plurality of arcuate crowns with each crown having an arcuate crown peak with a radius of curvature located along a reference axis and first and second arcuate crown shoulders on first and second opposite sides, respectively, of the reference axis, said crowns being in alternating opposite facing orientations along a circumference of the segment surrounding the bore, and comprising a plurality of pairs of adjacent struts bridging between opposite facing adjacent crowns in the respective segment, such that each pair of adjacent struts bridge the shoulders of one crown with a shoulder of each next adjacent opposite facing crown, respectively; and each adjacent pair of segments is connected by at least one connection, and further wherein the first and second arcuate crown shoulders having a maximum width adjacent the crown peak and tapering to a minimum width, the crown peak having a width that is greater than the maximum width of the first and second arcuate crown shoulders. a radially expandable stent comprising a filamental structure chosen from a metal or metal alloy in a pattern surrounding a bore to form a substantially tubular wall along a length relative to a longitudinal axis; wherein the filamental structure comprises at least one high strain region and at least one low strain region along the pattern; wherein the filamental structure comprises a material strain distribution under deflection force of lateral bending or radial expansion relative to the longitudinal axis that is principally locally concentrated along the high strain region; wherein the low strain region comprises at least one of (a) a width in a circumferential plane around the longitudinal axis that is substantially greater than a width of the high strain region along the longitudinal axis, (b) a width that is substantially greater than a radial thickness at the respective low strain region, and (c) a substantially increased radiopacity versus the high strain region. characterised in that the filamental structure pattern further comprises a plurality of adjacent circumferential segments surrounding the bore and that are provided in series along the length; and wherein the filamental structure pattern of each segment comprises a plurality of arcuate crowns with each crown having an arcuate crown peak with a radius of curvature located along a reference axis and first and second arcuate crown shoulders on first and second opposite sides, respectively, of the reference axis, said crowns being in alternating opposite facing orientations along a circumference of the segment surrounding the bore, and comprising a plurality of pairs of adjacent struts bridging between opposite facing adjacent crowns in the respective segment, such that each pair of adjacent struts bridge the shoulders of one crown with a shoulder of each next adjacent opposite facing crown, respectively; and each adjacent pair of segments is connected by at least one connection, and further wherein the first and second arcuate crown shoulders having a maximum width adjacent the crown peak and tapering to a minimum width, the crown peak having a width that is greater than the maximum width of the first and second arcuate crown shoulders.