I am writing a literature review on this topic as an assignment. I need some inspiration about the recent efforts in making them more effective in drug release (sustained/triggered)/more responsive (smarter)/cheaper/more wearable, from micro-biotechnology or materials science perspective. Examples of these micro-systems are micro-pumps, micro-needles and atomizers. Anyone who is expert/working on related projects, willing to share some insights? Your kindness is very much appreciated. Thank you!