With the progress of the times, there are more and more new diagnosis and treatment devices. Today we will introduce a widely used medical device-safety syringe. The safety syringe is composed of a jacket, a core rod, a rubber stopper, a connecting piece, a sealing ring and a needle seat.

Safety syringes include a variety of design principles and processing methods.

Safety syringes protect medical staff on the basis of self-destructing syringes. The structure is on the basis of self-destruction, the needle retracts the jacket and the sheath moves forward, and the outer sheath protects the needle, thereby realizing safe injection.

Unlike self-destructing syringes, the design concept of safety syringes is to ensure that they are not reused and safe for the operator, not to ensure safe disposal after use. Protecting the used needle is the focus of its design. The protection methods include outer sliding sleeve type, needle retraction type, and needle tip outsourcing. Needle tip outsourcing is the mainstream in the market.

The needle outsourcing is to add a safety protection sheath next to the needle seat, and there is a safety buckle in the sheath. After the injection is completed, press the outer side of the protection sheath with your thumb, so that the buckle locks and fixes the needle tube, and the needle tip is wrapped in the sheath, which avoids needle sticking.

For the needle retraction type, during the injection process, the piston moves forward with the core rod; when the injection is completed, the piston and the needle joint are engaged, and the injection personnel can pull back the core rod and draw the needle into the syringe barrel. Since there is an angle of 10° between the central axis of the needle head and the central axis of the needle barrel, after the needle enters the barrel, it leans against the wall of the barrel, and then pushes it forward, the needle bends and curls up in the barrel, thereby avoiding or reducing damaged syringe needle stick injuries human body.

The outer sliding sleeve type has a layer of slidable sleeve outside the syringe barrel (Barrel). After the injection is completed, the sliding sleeve is withdrawn to cover the exposed injection needle, and then the sliding sleeve is rotated until the top buckle is locked, so as to ensure that the injection needle is stored in the tube sleeve without exposure, and effectively avoid needle stabbing.