The present invention provides a device for bone fixation that includes: an expanding unit and an enclosing unit. The expanding unit includes two or more expanding structures capable of switching between an expanded state and a contracted state. The expanding unit includes a first expanding structure located near a first end thereof and a second expanding structure located near a second end thereof. The enclosing unit encloses the expanding unit and has a first end and a second end. The first end of the enclosing unit is secured at the first end of the expanding unit, and the second end of the enclosing unit is secured at the second end of the expanding unit. When the device for bone fixation is placed inside a bone, the expanding structures of the expanding unit are switched to the expanding state and thereby propping up the enclosing unit.本發明提供一種骨固定裝置,包括:一展開單元以及一包覆單元。所述展開單元具有一展開單元第一端以及一展開單元第二端,並且包括兩個以上的展開結構。該等展開結構可以於一展開狀態以及一收縮狀態之間切換。所述包覆單元係用以包覆所述展開單元,其具有一包覆單元第一端以及一包覆單元第二端。包覆單元第一端係固定於展開單元第一端,而包覆單元第二端係固定於展開單元第二端。其中,當骨固定裝置置入一骨頭中時,所述展開單元之該等展開結構係切換至展開狀態並且將包覆單元撐開,且一醫療填充物係經由該展開單元第二端填入包覆單元中。100‧‧‧展開單元110a‧‧‧第一展開結構110b‧‧‧第二展開結構120‧‧‧展開單元第二端140‧‧‧套件200‧‧‧包覆單元210‧‧‧類球型包覆部件220‧‧‧包覆單元第二端300‧‧‧協助展開單元310‧‧‧操縱桿320‧‧‧結合端330‧‧‧操縱端340‧‧‧中空結合管件341‧‧‧中空結合管件前端342‧‧‧中空結合管件後端
