A stent device having a length extending in a distal to proximal direction, the device comprising: a plurality of adj acent rings arranged transverse to the length of the device, wherein each ring comprises a length of material arranged radially around the length of the stent device as a plurality of repeating biphasic cells, each biphasic cell comprising a first open trapezoidal portion having a first side, a second side and a third side forming a proximal-facing opening , and a second open trapezoidal portion having a fourth side, a fifth side and a sixth side forming a distal-facing opening, wherein the second side and the fifth side are parallel , further wherein the first open trapezoidal portion is radially offset from the second open trapezoidal portion and the third side of the first open trapezoidal portion is connected to the fourth side of the second open trapezoidal portion by a first connector region, and wherein the first side of the first open trapezoidal portion connects to a sixth side of an adjacent biphasic cell in the ring by a second connector; between one and three s-shaped connectors connecting each ring that is adjacent to a more distal ring to the more distal ring, wherein each s-shaped connector connects between the first side and the second side of one of the first open trapezoidal portions of the plurality of biphasic cells in the ring that is adjacent to the more distal ring to between the fifth side and sixth side of one of the second open trapezoidal portions of the plurality of biphasic cells of the more distal ring, wherein the device has a first configuration in which a first diameter of the plurality of adjacent rings is between 0.5 mm and 5 mm, and a second configuration in which a second diameter of the plurality of adj acent rings is between 6 mm and 11 mm, and wherein the second side and the fifth side remain parallel as the stent device expands from the first configuration to the second configuration. a plurality of adj acent rings arranged transverse to the length of the device, wherein each ring comprises a length of material arranged radially around the length of the stent device as a plurality of repeating biphasic cells, each biphasic cell comprising a first open trapezoidal portion having a first side, a second side and a third side forming a proximal-facing opening , and a second open trapezoidal portion having a fourth side, a fifth side and a sixth side forming a distal-facing opening, wherein the second side and the fifth side are parallel , further wherein the first open trapezoidal portion is radially offset from the second open trapezoidal portion and the third side of the first open trapezoidal portion is connected to the fourth side of the second open trapezoidal portion by a first connector region, and wherein the first side of the first open trapezoidal portion connects to a sixth side of an adjacent biphasic cell in the ring by a second connector; between one and three s-shaped connectors connecting each ring that is adjacent to a more distal ring to the more distal ring, wherein each s-shaped connector connects between the first side and the second side of one of the first open trapezoidal portions of the plurality of biphasic cells in the ring that is adjacent to the more distal ring to between the fifth side and sixth side of one of the second open trapezoidal portions of the plurality of biphasic cells of the more distal ring, wherein the device has a first configuration in which a first diameter of the plurality of adjacent rings is between 0.5 mm and 5 mm, and a second configuration in which a second diameter of the plurality of adj acent rings is between 6 mm and 11 mm, and wherein the second side and the fifth side remain parallel as the stent device expands from the first configuration to the second configuration. <EOS>