The invention relates to an injection device which includes a handle and a guard which together enclose a movable cartridge which can contain liquid material to be injected, and further enclose a movable injector that includes a needle, the needle being attached to a housing where the housing is attached to the cartridge, the device also including a delivery mechanism whereby the needle is moved from a retracted to an extended position, and independently the volume of the chamber may be adjusted to expel the contents thereof through the needle and into a subject in need thereof.本發明係關於一種包含一手柄及一防護罩之注射裝置，該手柄及該防護罩一起封閉可含有待注射液體材料之一可移動筒，且進一步封閉包含一針頭之一可移動注射器，該針頭附接至一外殼，其中該外殼附接至該筒，該裝置亦包含一遞送機構藉此該針頭從一縮回位置移動至一延伸位置，且可獨立地調整一室之容積以透過該針頭排出其內容物並在需要該內容物時將該內容物排出至一患者中。
