System and method for drug delivery with a safety syringe

A system for injecting, comprising:

• a syringe body defining an interior medicine chamber;
• a stopper member configured to be inserted into the interior medicine chamber to contain medicine within the medicine chamber;
• a plunger member configured to be manually manipulated to insert the stopper member relative to the syringe body;
• a needle having proximal and distal ends, the proximal end comprising an anchoring geometry configured to be at least partially penetrated into the stopper member such that upon retraction of the stopper member, the needle is pulled proximally along with the stopper to be at least partially contained within the interior medicine chamber;
• an energy-storing member operatively coupled between the stopper member and the syringe body, the energy-storing member configured to facilitate retraction of the stopper member relative to the syringe body;
• a needle latch having a latched position, in which the needle latch prevents proximal movement of the needle relative to the syringe body, and an unlatch position, in which the needle latch allows proximal movement of the needle relative to the syringe body;
• and
• a needle latch actuating member configured to move the needle latch from the latched position to the unlatch position when the needle latch actuating member is moved distally relative to the needle latch in the latched position,
• wherein the needle and the needle latch actuating member are configured such that moving the needle distally causes the needle to apply a distally directed force to the needle latch actuating member, causing the needle latch actuating member to move distally, thereby moving the needle latch from the latched position to the unlatched position,
• wherein the needle latch actuating member includes a hole configured to receive the needle distal end, and
• wherein the needle latch actuating member is configured to move after the needle is retracted from the hole to prevent the needle from reentering the hole.