PROBLEM TO BE SOLVED: To provide a polyaxial bone anchoring device for reliably anchoring a head and a rod.SOLUTION: A polyaxial bone anchoring device includes: a bone anchoring element 1 having a shank 2 to be anchored in the bone and a head 3 a receiving part 5 coupled to the shank, configured to pivotably receive the head, and provided with a channel 56 for receiving a rod 6 and a central axis C a pressurizing member 7 arranged in the receiving part and configured to exert pressure onto the head to lock the head in the receiving part and a locking member 8 that is insertable into the channel. The locking member includes a top end and a bottom end facing the pressurizing member, and a deformable first portion 85 and a second portion are provided at the bottom end. When the locking member is advanced into the channel in the direction of the central axis C, the deformable first portion 85 comes into contact with the pressurizing member 7 first and is deformed resulting in a load applied to the pressurizing member that clamps the head, and the second portion comes into contact with the rod and clamps the rod.COPYRIGHT: (C)2014,JPO&INPIT【課題】頭部とロッドとを信頼性をもって固定する多軸骨アンカー固定装置を提供する。【解決手段】多軸骨アンカー固定装置は、骨にアンカー固定される軸2及び頭部3を有する骨アンカー固定要素1と、シャンクに結合され頭部を回動可能に受け、ロッド6を受けるチャネル56と中心軸Cとを有する受け部5と、受け部に配置され受け部において頭部を固着するために頭部に圧力をかける加圧部材7と、チャネルに挿入可能な固着部材8とを備え、固着部材は上端部と加圧部材に面する底端部とを含み、底端部に設けられる変形可能な第1の部分85と第2の部分とを備え、固着部材が中心軸Cの方向にチャネル内を進むと、変形可能な第1の部分85が最初に加圧部材7に接触して変形し、頭部を締める加圧部材にかかる負荷をもたらし、第2の部分がロッドに接触してロッドを締める。【選択図】図1
