Nozzle device and minimally invasive injection device comprising same

A minimally invasive injection device, comprising:

• a nozzle part comprising a first reservoir part to contain a liquid to be injected, an outlet to generate a microjet of the liquid, and an injection part of a micro-scale size connected to the outlet and adapted to be penetrated and inserted into stratum corneum or epidermis so that the liquid is injected into and below the dermis by the microjet;
• and
• a pressure providing part comprising a first pressure applying part, a third pressure applying part connected to the first pressure applying part and configured to apply the pressure to the first reservoir part, and a first pressure generator to provide the pressure to the first pressure applying part,
• wherein a plurality of outlets and injection parts connected thereto are connected to the first reservoir part, and a plurality of protrusions corresponding to the outlets are formed in the third pressure applying part, and
• wherein a ring or a locking step is formed in the third pressure applying part and a groove engaged with the ring of a groove part engaged with the locking step is formed in the reservoir part at a location corresponding to an extended distance.