This invention relates to a flat fitting type external fixing device and its assembly method, wherein a plurality of fixing frames are respectively sleeved to the outer sides of multiple bone nails from the ends of the bone nails, and are connected by at least one connecting rod a plurality of fixing nuts are respectively sleeved between the bone nails and the fixing frames from the ends of the bone nails and are used for locking the bone nails and the fixing frames the parts exposing from the fixing nuts of the bone nails are cut the fixing nuts are respectively loosened from the fixing frames and moved towards the ends of the bone nails the fixing frames are respectively moved towards the ends of the bone nails and then are locked by the fixing nuts again a plurality of set screws are respectively used to lock the fixing nuts to further fasten the bone nails.本發明係一種平貼式外固定裝置及其組裝方法,將複數固定架分別由複數骨釘之一端套入該些骨釘外側,以至少一連接桿連接該些固定架,將複數固定螺帽分別由該些骨釘之該端套入該些骨釘與該些固定架之間並鎖固於該些骨釘與該些固定架,裁切該些骨釘露出該些固定螺帽之部分後,分別將該些固定螺帽由該些固定架鬆脫並向該些骨釘之該端移動,再分別將該些固定架向該些骨釘之該端移動並再次鎖固於該些固定螺帽,並可將複數止付螺絲分別鎖固於該些固定螺帽以進一步迫緊該些骨釘。10‧‧‧骨釘100‧‧‧第二陽螺紋102‧‧‧第四陽螺紋12‧‧‧固定架120‧‧‧固定孔1200‧‧‧第一陰螺紋122‧‧‧連接孔1220‧‧‧連接縫14‧‧‧連接桿16‧‧‧固定螺帽160‧‧‧螺帽孔1600‧‧‧第二陰螺紋1602‧‧‧第三陰螺紋162‧‧‧螺帽頭164‧‧‧螺帽尾1640‧‧‧第一陽螺紋18‧‧‧止付螺絲180‧‧‧第三陽螺紋182‧‧‧止付螺孔
