A method for adjustable quantitative injection of high-pressure gas is provided, wherein the gas may have a pressure of 5Mpa or more than 5MPa. The gas may directly communicate with a gas tank in the mechanism or an external gas source, flows through corresponding valves, and is charged into a predetermined or adjustable reservoir. Alternatively, the valve may be time-controllable and does not need the reservoir. The gas is ejected through a head selected depending on depth or range of injection, wherein the head is connected to the main mechanism via a one-way valve to prevent contamination due to backflow. The manipulator can exert an appropriate force onto a target portion of a human for gas injection, and when the injection is done, a biasing member can automatically return the mechanism to the original state for the next injection.一種可調式定量注射高壓氣體的方法，其中前述氣體之壓力可等於或大於5兆帕。前述氣體可直接接通機構內的氣瓶或外接氣源，並經過對應的閥門而充氣到預設或可調節容積的儲氣室。或者，此閥門為可調控開閥時間的閥門而不需儲氣室。氣體噴出後經過依注射深度或範圍而選擇的噴頭，其中噴頭與機構本體間設有一單向閥以避免因回流所造成的污染。操作人員可以適當力量壓在需作用的人體部位已進行噴氣注射，之後再由機構內的彈性裝置復位到原始狀態，以利於下次注射。
