Which design innovation to the EpiPen® auto-injector most significantly improved its usability during life-threatening allergic emergencies?

Modern medical product design has transformed healthcare delivery and patient outcomes. From emergency devices to everyday monitoring tools, thoughtful design innovations have made medical interventions more effective, accessible, and user-friendly. This trivia question focuses on a groundbreaking medical product design change that dramatically increased survival rates for a common emergency condition. Test your knowledge of how design thinking has revolutionized medical interventions!

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The introduction of a retractable needle shield that automatically covers the needle after injection
The addition of Bluetooth connectivity to track usage and expiration dates
The implementation of voice instructions to guide users through the injection process
The development of a fingerprint recognition system to prevent unauthorized use