System and method for safety syringe

A system for injecting, comprising:

• a syringe body defining a proximal opening and a distal needle interface;
• a plunger member defining a plunger interior and configured to be manually manipulated to insert a stopper member relative to the syringe body, the plunger member including
• a needle retention feature disposed in the plunger interior,
• an energy-storage member disposed in the plunger interior, and
• an energy-storage member latching member disposed in the plunger interior;
• and
• a needle hub assembly coupled to the distal needle interface of the syringe body, the needle assembly including
• a needle having a needle proximal end feature,
• a hub, and
• a needle latching member configured to couple the needle to the hub,
• wherein the needle is at least partially retractable into plunger interior upon manipulation of the plunger member relative to the syringe body to transform the energy-storage member latching member from a latched state to an unlatched state,
• wherein the energy-storage member latching member is intercoupled between an interior surface of the plunger member and the needle retention feature,
• wherein the needle proximal end feature comprises an angled portion, and
• wherein the needle retention feature comprises a tubular member sized to allow passage of the needle proximal end feature in a first direction and to prevent passage of the needle proximal end feature in a second direction opposite to the first direction.

A system for injecting, comprising:

• a syringe body defining a proximal opening and a distal needle interface;
• a plunger member defining a plunger interior and configured to be manually manipulated to insert a stopper member relative to the syringe body, the plunger member including
• a needle retention feature disposed in the plunger interior,
• an energy-storage member disposed in the plunger interior, and
• an energy-storage member latching member disposed in the plunger interior;
• and
• a needle hub assembly coupled to the distal needle interface of the syringe body, the needle assembly including
• a needle having a needle proximal end feature,
• a hub, and
• a needle latching member configured to couple the needle to the hub,
• wherein the needle is at least partially retractable into plunger interior upon manipulation of the plunger member relative to the syringe body to transform the energy-storage member latching member from a latched state to an unlatched state,
• wherein the energy-storage member latching member is intercoupled between an interior surface of the plunger member and the needle retention feature, and
• wherein the needle proximal end feature comprises a pointed end without sharp edges.