Preferably, the invention relates to {HEAD ~ a device} wherein {TAIL ~ the brackets} do not have extensions that are directed perpendicularly to the distraction screw and perpendicularly to the brackets, at a level between the brackets and directed away from the distraction screw into the site of osteogenesis 
Preferably , the invention relates to { HEAD ~ a device } wherein { TAIL ~ the brackets } do not have extensions that are directed perpendicularly to the distraction screw and perpendicularly to the brackets , at a level between the brackets and directed away from the distraction screw into the site of osteogenesis
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