PROBLEM TO BE SOLVED: To provide a screw assembly for a spine capable of ensuring dynamic stability after an operation.SOLUTION: A screw assembly 1 for a spine includes a casing member 2, a bone engagement member 3, an intermediate member 4, and a pressing member 5, the intermediate member 4 is stored within the casing member 2 while abutting on a connection member 6 inserted into a pair of insertion parts 24, 24, the pressing member 5 is connected to the casing member 2 while abutting on the connection member 6, and a contact part abutting on at least the connection member 6 is made of a synthetic resin for at least one of the intermediate member 4 and the pressing member 5.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】手術後の動的安定性を確保することができる脊椎用スクリューアセンブリを提供することである。【解決手段】筐体部材2、骨係合部材3、中間部材4および押圧部材5を備え、中間部材4は、一対の挿通部24、24に挿通されている接続部材6に接触している状態で筐体部材2内に収容されており、押圧部材5は、接続部材6に接触している状態で筐体部材2に接続されており、中間部材4および押圧部材5のうち少なくとも一方は、少なくとも接続部材6に接触している接触部が合成樹脂からなる、脊椎用スクリューアセンブリ1である。【選択図】図2
