Which innovative product design feature was first incorporated into insulin pens to significantly improve medication adherence for diabetic patients?

The medical device industry constantly evolves to address patient needs, improve outcomes, and enhance healthcare delivery. Product design in medicine requires balancing innovation with safety, usability, and regulatory compliance. Test your knowledge about a groundbreaking medical product design feature that transformed patient care and adherence.

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Memory function that records the time and dose of the last injection
Color-changing needle tips that indicate sterility status
Voice-activated dose selection capability
Temperature-sensing technology that optimizes insulin efficacy