Novel injector

The application discloses novel injector, the syringe includes cylinder, push rod, piston and syringe needle, it is provided with telescopic protective housing to fix on the syringe needle, the lower terminal surface of telescopic protective housing is fixed and is provided with a protection cotton, wherein, telescopic protective housing comprises a plurality of sections protective housings, and every section protective housing cup joints the connection in proper order, and just the diameter of every section protective housing reduces from supreme down in proper order, and one end protective housing is topmost fixed on the surface of syringe needle. The utility model provides a syringe injection back that finishes, the syringe needle is protected by telescopic protective housing, has avoided the emergence of the unexpected condition of stabbing, gives that doctors and nurses or the cleanup crew collects to handle and has brought the facility, has avoided because of stabbing the problem emergence that arouses