Fluid Delivery and Measurement Systems and Methods

A fluid delivery device comprising:

• a first housing having an interior;
• a flexible member within the interior of the first housing and mechanically coupled to the first housing, the flexible member forming first and second chambers within the interior of the first housing;
• a gas generator in fluid communication with the flexible member via the first chamber of the first housing;
• a microprobe connected to the first housing such that when the gas generator produces a gas pressure sufficient to move the flexible member a portion of a fluid disposed in the second chamber is ejected via the microprobe;
• a second housing in fluid communication with the first chamber of the first housing so that the second housing is capable of increasing the pressure in the first chamber of the first housing to increase a rate of fluid ejection via the microprobe.