A stent delivery system comprising: a first elongate shaft including a proximal portion, a distal portion, and a lumen extending at least partially therethrough; a second elongate shaft including a proximal portion, a distal portion, and a lumen extending at least partially therethrough, the second elongate shaft longitudinally movable relative to the first elongate shaft; a bifurcated stent having a first arm positioned on the distal portion of the first elongate shaft, a second arm positioned on the distal portion of the second elongate shaft, and a main body positioned on the first and second elongate shafts, the stent having a constrained configuration and an expanded configuration; a proximal constraining member releasably connected to a proximal portion of the stent and having a first position and a second position; a first distal constraining member releasably connected to the first arm of the stent and having a first position and a second position; and a second distal constraining member releasably connected to the second arm of the stent and having a first position and a second position; characterised in that the proximal constraining member comprises a proximal retaining wire, the first distal constraining member comprises a first distal retaining wire and the second distal constraining member comprises a second distal retaining wire to releasably lock the stent to the proximal and distal constraining members; the proximal and the first and second distal constraining members each comprise a first loop (88, 102) operably connected to the stent and one retaining wire; wherein the proximal constraining member and the first and second distal constraining members are configured to cooperatively apply a longitudinal tensile force to at least a portion of the stent in the constrained configuration with the proximal and first and second distal constraining members each in the first position; and wherein the stent is repeatedly movable between the constrained configuration and the expanded configuration. a first elongate shaft including a proximal portion, a distal portion, and a lumen extending at least partially therethrough; a second elongate shaft including a proximal portion, a distal portion, and a lumen extending at least partially therethrough, the second elongate shaft longitudinally movable relative to the first elongate shaft; a bifurcated stent having a first arm positioned on the distal portion of the first elongate shaft, a second arm positioned on the distal portion of the second elongate shaft, and a main body positioned on the first and second elongate shafts, the stent having a constrained configuration and an expanded configuration; a proximal constraining member releasably connected to a proximal portion of the stent and having a first position and a second position; a first distal constraining member releasably connected to the first arm of the stent and having a first position and a second position; and a second distal constraining member releasably connected to the second arm of the stent and having a first position and a second position; characterised in that the proximal constraining member comprises a proximal retaining wire, the first distal constraining member comprises a first distal retaining wire and the second distal constraining member comprises a second distal retaining wire to releasably lock the stent to the proximal and distal constraining members; the proximal and the first and second distal constraining members each comprise a first loop (88, 102) operably connected to the stent and one retaining wire; wherein the proximal constraining member and the first and second distal constraining members are configured to cooperatively apply a longitudinal tensile force to at least a portion of the stent in the constrained configuration with the proximal and first and second distal constraining members each in the first position; and wherein the stent is repeatedly movable between the constrained configuration and the expanded configuration.