Needleless syringe having multi-nozzle and manufacturing method therefor

A needleless syringe having a multi-nozzle, the needleless syringe comprising:

• an upper housing (100) defining a chamber for containing a pressure-generating liquid (10) and including a pressure-generating unit (120) at an upper portion of the upper housing (100);
• a lower housing (200) configured to contain a drug solution (20) and coupled to a lower portion of the upper housing (100);
• an elastic membrane (130) disposed between the upper housing (100) and the lower housing (200) to separate the pressure-generating liquid (10) from the drug solution (20);
• an outer chamber (300) attached to a lower portion of the lower housing (200) and having an insertion portion (320) in fluid communication with an interior of the lower housing (200), the insertion portion (320) being shaped to gradually expand toward a lower end of the outer chamber (300);
• an inner chamber (400) inserted into the insertion portion (320), the inner chamber (400) having a plurality of branch grooves (410) on an outer surface of the inner chamber (400), the plurality of branch grooves (410) being sealed by an inner surface of the insertion portion (320) to define a plurality of branch channels (500);
• and
• a plurality of injection nozzles (600) of the multi-nozzle coupled to a lower portion of the inner chamber (400), each injection nozzle (600) of the plurality of injection nozzles having an injection channel (610) fluidly connected to a respective one of the plurality of branch channels (500).