Safety syringe

A safety syringe comprising;

• a hollow barrel having
• a distal end,
• a proximal end,
• an outside surface,
• an inner surface,
• an exterior thread formed on the outside surface near the distal end,
• multiple longitudinal ribs formed on the inner surface near the distal end, and
• a finger flange defined at the proximal end and protrudes from diametrically opposite sides,
• a needle hub mounted on the hollow barrel at the distal end and having
• a needle having a fluid channel defined though the needle,
• a hub connected to the needle and having
• a proximal end,
• a distal end,
• a middle,
• an outside surface,
• an inner surface,
• multiple longitudinal ribs formed on the outside surface and engaged by the longitudinal ribs inside the hollow barrel,
• an external thread formed at the middle of the hub near the distal end,
• a fluid channel defined through the distal end and the external thread and communicating with the fluid channel in the needle,
• a cavity defined through the hub, communicating with the fluid channel in the hub and having a depth, and
• at least one channel defined in the inner surface of the hub, and communicating with the cavity and having a length, and
• a stopper slidably mounted inside the cavity in the hub and having a height,
• a sleeve mounted on the hub and having
• an inner surface,
• a front end,
• a rear end,
• an outer interior thread defined in the inner surface at the front end, corresponding to and screwing onto the external thread on the hub, and
• an inner interior thread defined in the inner surface at the rear end, corresponding to and screwing onto the threaded end of the hollow barrel, and
• a plunger slidably mounted inside the hollow barrel and having
• a distal end,
• a proximal end, and
• a sliding stopper mounted on the distal end of the plunger.