System and method for safety syringe

A method for mixing and injecting medicine into a patient, comprising:

• providing a system comprising
• a cylindrical injection body defining a proximal opening and a distal needle interface at a distal end thereof,
• proximal and distal stopper members disposed in the cylindrical injection body, forming a proximal medicine chamber between the proximal and distal stopper members and a distal medicine chamber between the distal stopper member and the distal end of the cylindrical injection body,
• a plunger member defining a plunger interior and configured to insert the proximal stopper member relative to the cylindrical injection body, and
• a needle member having a distal needle tip, a medicine passage, a plurality of transfer openings, and a proximal end;
• and
• wherein the distal stopper includes a funnel disposed at a distal end thereof, the funnel tapering in a proximal direction, such that an inner diameter of a distal end of the funnel is larger than an inner diameter of a proximal end of the funnel;
• advancing the plunger member to pierce the proximal end of the needle member through the distal stopper to allow the passage of a first medicine component from the proximal medicine chamber through the medicine passage and into the distal medicine chamber to allow mixing of the first medicine component with a second medicine component in the distal medicine chamber to form a mixed medicine;
• and
• advancing the plunger member to inject the mixed medicine into a patient,
• wherein the distal stopper member comprises a proximal gate having a closed configuration wherein the needle proximal end feature cannot pass through the proximal gate, and an open configuration wherein the needle proximal end feature can pass through the proximal gate.