Disclosed herein is a window plate device featuring straight-angle fixation after rotation, comprising: a plate member provided with screw perforations to be inserted by screws, such that the plate member may be fixed to a spine section, a block projection being concavely milled between perforations and bored with a shaft through hole a plurality of capping members, each having a piercing shaft to penetrate through the shaft through hole, a compression platen being transversely connected to compress the top of the screw and a plurality of screws for penetrating through the screw perforations, a peg portion for fixing the spinal joint characterized in that a curved groove is milled at the lower portion of the plate, the piercing shaft penetrates through the shaft through hole, with the periphery of the block projection being sleeved by the curved groove, the curvature of which allows the capping members, when turned axially, to surround in tight contact with the straight edges of block projections at four sides thereof, such that the compression platen of capping members is held at the top of the screws.一種旋轉後平角固定之視窗骨板裝置,包含有:一骨板件,設有骨釘穿孔,穿入一骨釘固定於一脊椎骨節,穿孔間凹銑一方塊凸起,並穿設一軸穿孔;多個壓頂件,具一穿軸穿入軸穿孔,橫向銜接一壓板,可壓制該骨釘頂部;及多個骨釘,穿入骨釘穿孔,一釘部固定骨節;其特徵在於:該壓板下方,銑一弧形凹槽,該穿軸穿入該軸穿孔,該弧形凹槽套該方塊凸起周緣,該弧度可於該壓頂件軸轉時,包圍並緊迫接觸於該方塊凸起之四邊直邊,使得該壓頂件壓板保持於骨釘頂部。10‧‧‧旋轉後平角固定之視窗骨板裝置20‧‧‧骨板件21‧‧‧骨釘穿孔22‧‧‧方塊凸起23‧‧‧軸穿孔24‧‧‧四邊直邊25‧‧‧圓形槽26‧‧‧圓角30‧‧‧骨釘31‧‧‧骨釘頂部32‧‧‧骨釘釘部40‧‧‧壓頂件41‧‧‧穿軸42‧‧‧壓板43‧‧‧弧形凹槽
