An expandable device comprising: a plurality of strut regions extending circumferentially about the expandable device, each of the strut regions including a plurality of struts and a plurality of apices, each of the struts extending between adjacent apices, the plurality of strut regions including a first strut region having first struts and a second strut region having second struts, the first strut region adjacent the second strut region, wherein (a) the first strut region comprises a first plurality of apices extending towards the second strut region and defining a first circumferential plane, and (b) the second strut region comprising a second plurality of apices extending towards the first strut region and defining a second circumferential plane; and a plurality of bridge regions extending between adjacent strut regions and including a plurality of bridges, wherein each of the bridges includes a first curved segment and a second curved segment having opposing concavities; wherein each of the bridges extends between a first end disposed at one of the first struts of the first strut region and one of the second struts of the second strut region such that the first curved segments of the bridge extend across the first circumferential plane towards the second strut region, and the second curved segments of the bridges extend across the second circumferential plane towards the second strut region, characterised in that each of the first struts extends from one of the first apices in a first circumferential direction and is located at a first side of a longitudinal plane extending between the one of the first apices and one of the second apices, and each of the second struts extends from one of the second apices in a second circumferential direction opposite the first circumferential direction and is located at a second side of the longitudinal plane opposite the first side, the ones of the first apices being generally circumferentially aligned and longitudinally adjacent with the ones of the second apices. a plurality of strut regions extending circumferentially about the expandable device, each of the strut regions including a plurality of struts and a plurality of apices, each of the struts extending between adjacent apices, the plurality of strut regions including a first strut region having first struts and a second strut region having second struts, the first strut region adjacent the second strut region, wherein (a) the first strut region comprises a first plurality of apices extending towards the second strut region and defining a first circumferential plane, and (b) the second strut region comprising a second plurality of apices extending towards the first strut region and defining a second circumferential plane; and a plurality of bridge regions extending between adjacent strut regions and including a plurality of bridges, wherein each of the bridges includes a first curved segment and a second curved segment having opposing concavities; wherein each of the bridges extends between a first end disposed at one of the first struts of the first strut region and one of the second struts of the second strut region such that the first curved segments of the bridge extend across the first circumferential plane towards the second strut region, and the second curved segments of the bridges extend across the second circumferential plane towards the second strut region, characterised in that each of the first struts extends from one of the first apices in a first circumferential direction and is located at a first side of a longitudinal plane extending between the one of the first apices and one of the second apices, and each of the second struts extends from one of the second apices in a second circumferential direction opposite the first circumferential direction and is located at a second side of the longitudinal plane opposite the first side, the ones of the first apices being generally circumferentially aligned and longitudinally adjacent with the ones of the second apices.