Electrically Modulated Semi-Convertible Hydrogel Microneedles for Programmable Insulin Delivery

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Endocrinology

Background:

• Current insulin delivery methods for type 1 diabetes often lack sustained and precise control.
• Mimicking the pancreas's dynamic insulin secretion is a key goal for improved diabetes management.

Purpose of the Study:

• To develop a wearable, electrically modulated microneedle system for self-regulated insulin delivery.
• To create a system capable of sustained and precise insulin release for type 1 diabetes treatment.

Main Methods:

• A semi-convertible hydrogel microneedle system combining silk fibroin and polyethylene glycol/chitosan was engineered.
• Flexible electrodes induced a gel-sol phase transition in the hydrogel under 1.2 V electrical stimulation for insulin release.
• The system's performance was evaluated in type 1 diabetic mouse models.

Main Results:

• Electrical stimulation triggered insulin release via silk fibroin phase transition and polymer network expansion.
• Insulin release was controlled by electrical signals, with passive diffusion occurring when stimulation ceased.
• A single microneedle patch demonstrated segmented control, with effects lasting up to 16 hours.

Conclusions:

• The developed microneedle system offers a versatile and precise approach to insulin delivery.
• This technology shows significant potential for long-term, self-regulated management of type 1 diabetes.
• The electrically modulated system provides a promising strategy for chronic disease management.