Which design innovation was introduced to insulin pens around 2010-2015 that significantly improved patient experience and adherence?

The design of medical devices is critical to patient outcomes and healthcare provider efficiency. From ergonomics to functionality, these products undergo rigorous testing and iteration before reaching the market. This trivia question focuses on an innovative design feature that revolutionized a common medical device, making it significantly more user-friendly for both patients and healthcare professionals while addressing a long-standing usage problem.

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Memory function that records the time and dose of last injection
Voice activation technology for hands-free operation
Biodegradable outer casing for environmental sustainability
Built-in glucose monitoring without separate finger pricks