Which product design innovation revolutionized diabetes management by enabling patients to self-administer insulin with precise dosing without requiring visual acuity?

Product design in medicine has evolved dramatically in recent decades, adapting to changing healthcare demands, technological capabilities, and patient needs. Thoughtful design considerations can significantly impact treatment outcomes, patient compliance, and healthcare delivery efficiency. This trivia question explores a pivotal design innovation that transformed a common medical device, making it more accessible and effective for patients worldwide.

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Insulin pen with audible click mechanism for dose measurement
Continuous glucose monitoring system with smartphone integration
Color-coded vial system for different insulin types
Implantable insulin pump with automatic delivery