A kind of related syringe with protection sleeve pipe of this creation system,Including syringe,Wherein the book office system of one end lateral surface is provided with protrusion； Pushing ram,Slippingly plug is located in syringe； Injection needle,Being axially fixed to syringe has outside one end of protrusion； Lid set,Removedly it is set in outside injection needle； And protection sleeve pipe,Upper shield outside syringe,Protection sleeve pipe have first,Second and third guide groove,First guide groove is arranged adjacent to injection needle,Third guide groove is arranged far from injection needle,Second guide groove is axially connected to first and third guide groove,Third guide groove and the second guide groove connectivity part form tapered mouth,The side at least within of tapered mouth has protruded out convex clamping point,The protrusion of syringe can slide in the first guide groove and the second guide groove,And it can pass through the convex clamping point of the force tapered mouth of drawing-in so that protrusion fixes in third guide groove.本創作係有關一種具有保護套管之注射器，包括針筒，其中一端外側面的預定處係設置有凸部；推進桿，可滑移地塞設在針筒內；注射針，軸向地固定在針筒具有凸部的一端外；蓋套，可移除地套設在注射針外；以及保護套管，套蓋在針筒外，保護套管具有第一、第二及第三導槽，第一導槽鄰近注射針設置，第三導槽遠離注射針設置，第二導槽軸向地與第一及第三導槽連通，第三導槽與第二導槽連通處形成漸縮口，漸縮口的至少其中一側凸伸有凸卡點，針筒的凸部可在第一導槽及第二導槽滑移，並可透過施力穿經漸縮口的凸卡點以使凸部卡固在第三導槽內。
