Dynamic outer fixing device

A dynamic outer fixing device of fracture fixing and supporting is mainly used for fracture of finger joints. The dynamic outer fixing device includes: a first support group, having a first fixing portion; a second support group, having a second fixing portion; and at least one elastic member, wherein one end of the elastic member is fixed to one of the support groups, the other end of the elastic member is connected to the other support group in a pivotal manner, and the elastic member has at least one geometric deformation zone, which has an adjustable path length in the extending direction of the elastic member. Through adoption of the elastic member that exhibits good elastic properties, stable supporting is provided, and supporting action tensile forces steady in strength can be released continuously and will not dramatically change due to increases of deformation of the dynamic outer fixing device, so that the space in a joint of an operated area is maintained, and comfort is provided. Meanwhile, the pivotal end of the elastic member provides an angle needed by the joint, and tissues are prevented from sticking to each other and the joint is prevented from contracture since the joint is fixed for a long period of time.