Which product design innovation in medicine is credited with revolutionizing diabetes management in the 1980s by allowing patients to self-administer precise insulin doses without syringes?

The field of medical product design has seen remarkable innovations in recent decades, particularly in drug delivery systems. One particular breakthrough revolutionized how patients with chronic conditions manage their medications. This innovation significantly improved patient compliance and quality of life while creating a multi-billion dollar product category. Test your knowledge about this important medical design advancement.

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The insulin pen (NovoPen)
Continuous glucose monitoring system
Insulin pump with electronic delivery
Transdermal insulin patch