this invention relates to a bone fixation device , and more particularly to a bone fixation device being injectable with medical fillings , comprising : a hollow fixation part having a joining end at a proximal end thereof , and an injecting end at a distal end thereof ; a cover part being joined with the injecting end of said hollow fixation part ; a medical filling being forceable and / or injectable via the injecting end of said hollow fixation part and into said cover part , such that the medical filling is allowed to become lump - like after injecting .