Fenestrated stent graft and stent graft system

A stent graft system, comprising a fenestrated stent graft, a bifurcated stent graft, and at least one graft extension, wherein

• the fenestrated stent graft comprises a tubular covering membrane, a support frame, at least one enveloping band surrounding the at least one fenestration, wherein the tubular covering membrane is a tubular structure with openings at two opposite ends, defines a communication cavity, and is provided with at least one fenestration, the support frame is implemented as a plurality of support frames that are arranged in an axial direction of the tubular covering membrane, and for each of the at least one enveloping band, the enveloping band is at least partially located on an outer circumferential wall of the tubular covering membrane and comprises a first region and a second region, wherein the first region is disposed in close contact with and surrounds a corresponding one of the at least one fenestration, the second region is disposed in close contact with and surrounds a side of the first region away from the corresponding one of the at least one fenestration, and a thickness of the first region is greater than a thickness of the second region;
• a proximal end of the bifurcated stent graft is connected to a distal end of the fenestrated stent graft;
• and
• the bifurcated stent graft comprises a proximal tube segment, a first side branch, and a second side branch, the first side branch is fixed to a distal end of the proximal tube segment and in communication with the proximal tube segment, and the second side branch is fixed to the distal end of the proximal tube segment and in communication with the proximal tube segment, such that the proximal tube segment is configured to shunt along the first side branch and the second side branch, and a proximal end of the at least one graft extension is connected to a distal end of at least one of the first side branch or the second side branch.