PROBLEM TO BE SOLVED: To provide polyaxial bone screw assemblies including longitudinal connecting members that provide dynamic, protected motion of the spine.SOLUTION: A dynamic fixation medical implant includes a longitudinal connecting member assembly 1 having an elongate coil-like outer member 4 and an inner cylindrical core 8 attached to the outer member at only one end thereof. Some assemblies include a second longitudinal connecting member in the form of a rod that is fixed to the inner core and extends outwardly from the assembly. Certain assemblies include a threaded core or threaded inserts that cooperate with a helical slit of the coil-like outer member. Two or more cooperating bone screw assemblies attach to the connecting member assembly. The bone screw assemblies may include upper and lower compression members for affixing to and cradling the coil-like outer member only, allowing relative movement between the outer member and the inner cylindrical core. Press fit or snap-on features attach one end of the coil-like outer member to one end of the inner cylindrical core.【課題】脊柱の動的な保護された動きを提供する長手方向接続部材を含む多軸骨ねじ組立体を提供する。【解決手段】動的固定医療インプラントは、細長いコイル様外側部材４と、その一端においてのみ外側部材に装着された内側円筒状コア８とを有する長手方向接続部材組立体１を含む。幾つかの組立体は、内側コアに固定され且つ組立体から外方に伸びるロッドの形態をした第二の長手方向接続部材を含む。特定の組立体は、コイル様外側部材の螺旋状スリットと協働するねじ付きコア又はねじ付きインサートを含む。２つ又はより多くの協働する骨ねじ組立体が接続部材組立体に装着される。骨ねじ組立体は、コイル様外側部材にのみ固定し且つ支えるための上側及び下側圧縮部材を含み、外側部材と内側円筒状コアとの間の相対的動きを許容する。圧力嵌め又はスナップ嵌め作用部はコイル様外側部材の一端を内側円筒状コアの一端に装着する。【選択図】図１
