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1. A sheath for loading and retracting a prosthetic implant, comprising a tube having opposing distal and proximal ends in its axial direction, the distal end being provided with a plurality of support rods arranged at intervals in a circumferential direction of the tube and having relative converged and flared configurations, wherein more than two connecting strips are provided in the axial direction between two adjacent support rods, and each connecting strip is approximately W-shaped and folded back and forth and two ends thereof are turned outwards to connect with the respective supporting rods at connection portions which have the same axial level; each connecting strip comprises a first segment, a second segment, a third segment and a fourth segment which are successively connected in the circumferential direction, and in the converged configuration, two adjacent segments of each connecting strip together assume an approximately Ω-shape; lengths of the connecting strips increase sequentially from the proximal end to the distal end; and wherein an area where the support rods are located is defined as an expansion section of the tube, and when being retracted, the prosthetic implant acts on the distal end of the sheath, thereby driving the expansion section to transform from the converged configuration to the flared configuration.
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