A kind of deserted sheath of dental syringe,Its main feature is thatSheath include can place arcotic arcotic cartridge for keeping articles and one be set in protection overcoat outside arcotic cartridge for keeping articles,And by arcotic cartridge for keeping articles and protection overcoat connection locking mechanism interconnected； Wherein,Arcotic cartridge for keeping articles open at one end,It is connect with syringe body dismountable type； The other end is equipped with the attachment base of connection anestetic needle,Lumen is equipped with inside attachment base,Lumen and arcotic cartridge for keeping articles internal run-through； Connecting locking mechanism includes； One is arranged in a convex block of the lower end outer wall of arcotic cartridge for keeping articles； The one lateral slot and a hook-shaped slot being arranged in the upper end of protection overcoat,The bottom of hook-shaped slot and lateral slot perforation connect； Lateral slot and hook-shaped slot are adapted to convex block. The sheath can be abandoned completely using Hou, have the advantages that the generation for the problems such as saving syringe resource, convenient sterilizing and avoiding cross-infection.一種牙科注射器用拋棄式護套，其特點是，護套包括可放置麻醉藥的麻醉藥置放筒和一套設在麻醉藥置放筒外的保護外套、以及將麻醉藥置放筒和保護外套相互連接的連接鎖定機構；其中，麻醉藥置放筒一端敞開，與注射器本體脫卸式連接；另一端設有連接麻醉針的連接座，連接座內部設有管腔，管腔與麻醉藥置放筒內部貫通；連接鎖定機構包括；一設置在麻醉藥置放筒的下端外壁的一凸塊；一在保護外套的上端設置的一橫向槽孔和一鉤狀槽孔，鉤狀槽孔的底部與橫向槽孔貫通連接；橫向槽孔和鉤狀槽孔與凸塊適配。該護套使用後可完全拋棄，具有節約注射器資源、方便消毒以及避免交叉感染等問題的發生的優點。
