Micro injecting device

A micro-injecting device, comprising:

• a base;
• a protective film disposed on the base;
• a heating resistor disposed on a portion of the protective film, for heating a heating chamber;
• an electrode layer disposed on the protective film and contacting the heating layer, for providing electricity from an external source to the heating layer;
• a heating chamber barrier layer disposed on the electrode layer, said heating chamber barrier layer defining said heating chamber surrounding the heating resistor;
• a channel array formed in the heating chamber barrier layer, said channel array comprising:
• a feeder channel connected to the heating chamber, for supplying a working fluid to the heating chamber;
• a primary channel connected to the feeder channel, for supplying the working fluid to the feeder channel;
• an auxiliary channel disposed adjacent to the primary channel;
• an inlet channel connected to the primary channel and the auxiliary channel, for introducing the working fluid to the primary and auxiliary channels;
• and
• a cross-channel connecting the primary channel to the auxiliary channel;
• a membrane layer overlaying the heating chamber barrier layer, for transmitting the volume change of the working fluid upon heating of the working fluid;
• a liquid chamber barrier layer disposed on the membrane, said liquid chamber barrier layer defining a liquid chamber coaxial with the heating chamber;
• and
• a nozzle plate disposed on the liquid chamber barrier layer, said nozzle plate having a nozzle aligned with the liquid chamber, for forming a drop from an injection liquid in the liquid chamber.