An improved pleated protective apparatus (140, 240, 340, 440, 540) for a sealing film of a trocar is provided. The protective apparatus (140, 240, 340, 440, 540) comprises a proximal end (142, 242, 342, 542) opening, a distal end (144, 244, 344, 544), and a central axis (141, 241, 341, 541). The distal end (144, 244, 344, 544) comprises a plurality of pleats (150, 250, 350, 550). Each pleat (150, 250, 35, 550) comprises a pleat peak (156, 256, 356, 556), a pleat valley (158, 258, 358, 558), and a pleat wall (157, 257, 357, 557) extending from the pleat peak (156, 256, 356, 556) to the pleat valley (158, 258, 358, 558). The plurality of pleats (150, 250, 350, 550) are arranged around the central axis (141, 241, 341, 541) in a disk shape and define a distal end hole (152, 252, 352, 452, 552), the edge of the distal end hole (152, 252, 352, 452, 552) being formed by a wave-shaped loop line (153, 253, 353, 453, 553). The wave-shaped loop line (153, 253, 353, 453, 553) is entirely located on a cylindrical surface or entirely located on a conical surface. An intersection line is formed where any cylindrical surface having the central axis (141, 241, 341, 541) as its center intersects with each pleat (150, 250, 350, 550) in a region adjacent to the distal end hole (152, 252, 352, 452, 552), the intersection line being a complete wave-shaped loop line (153, 253, 353, 453, 553). The proximal end (142, 242, 342, 542) opening of the protective apparatus (140, 240, 340, 440, 540) further comprises a boss (148, 248) and a cylindrical wall (146, 246) extending from the proximal end (142, 242, 342, 542) to the distal end (144, 244, 344, 544). The protective apparatus (140, 240, 340, 440, 540) does not interfere with itself when the sealing film (130, 330) and the protective apparatus (140, 240, 340, 440, 540) fold inwardly, and this can prevent the bending, stacking and tangling of the protective apparatus (140, 240, 340, 440, 540) and the sealing film (130, 330), thereby reducing
