Biasing device for spinal device

A spinal device includes a rod having a first end disposed in a housing, and a second end extending out of the housing through an aperture and movable to extend more or less from the housing. A biasing device mounted on the rod includes a series of connected at least incomplete coils. A first end of the biasing device is arranged against the housing, and a second end of the biasing device opposite the first end is fixed to the rod. 一种脊柱装置包括杆，该杆具有设置在外壳中的第一端，和第二端，该第二端通过孔伸出到外壳之外并且可移动以从外壳中伸出更多或从外壳中伸出更少。安装在杆上的偏置装置包括一系列连接的至少不完全线圈。偏置装置的第一端被布置成抵靠外壳，并且偏置装置的与第一端相对的第二端被固定至杆。