Advancing pen having individually capped cartridge

An advancing pen, comprising:

• an outer barrel;
• an inner chamber, the inner chamber running longitudinally along the inside of the outer barrel, the inner chamber having at least a first channel and a second channel, the first and second channels running longitudinally along the inside of the inner chamber, the inner chamber sufficiently dimensioned to contain a plurality of cartridges positioned in a sequential relationship within the inner chamber;
• an opening, the opening located at a first end of the outer barrel, the opening sufficiently dimensioned to allow a cartridge of the plurality of cartridges to exit the pen through the inner chamber in a serial manner;
• a retaining rack, the retaining rack holding the plurality of cartridges within the inner chamber, the first channel retaining the retaining rack in a static position;
• a movable rack, the movable rack holding the plurality of cartridges, the second channel retaining the movable rack and allowing the movable rack to slide back and forth within the second channel;
• a driving mechanism, the driving mechanism located at a second end of the outer barrel, the driving mechanism in contact with the movable rack such that when the driving mechanism is engaged, the plurality of cartridges advance through the inner chamber to the opening by forcing the movable rack to advance the plurality of cartridges along the retaining rack, and when the driving mechanism is disengaged, the movable rack returns to its original position.