Core-Shell Microneedle Patch for H2O2-Triggered Insulin Delivery
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Solution Overview
Problem
Current insulin delivery systems for diabetes management, such as open-loop subcutaneous injection and electronic closed-loop devices, face challenges with accuracy and sensor reliability, and chemically-engineered formulations using glucose oxidase (GOx) can cause toxicity and have biocompatibility issues due to slow pH changes and hydrogen peroxide generation.
Innovation Solution
Development of microneedle patches coated with H2O2 scavenging enzymes and comprising diblock copolymer micelles that dissociate insulin in acidic and oxidative environments, utilizing glucose oxidase and catalase nanogels to regulate insulin release based on glucose levels, ensuring rapid and controlled insulin delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If glucose oxidase is used to trigger insulin release through pH change, then insulin delivery can be glucose-responsive, but the pH change occurs slowly due to relatively slow conformation and morphology changes of materials under physiological conditions
Solution Approach 1:
The patent changes the triggering parameter from slow pH change to fast H2O2-triggered oxidation. The diblock copolymer micelles are designed to respond to H2O2 through oxidation of phenylboronic acid groups, which causes rapid micelle dissociation and immediate insulin release, eliminating the slow conformational changes associated with pH-based systems
Solution Approach 2:
The patent replaces the chemical pH-change mechanism with an oxidation-based mechanism. Instead of relying on slow protonation/deprotonation and conformational changes, the system uses H2O2-triggered oxidation of phenylboronic acid groups to break micelle stability, achieving rapid insulin release through chemical bond cleavage rather than gradual structural transformation
2Productivity
If glucose oxidase is used to generate H2O2 for triggering insulin release, then glucose-responsive delivery is achieved, but H2O2 generation causes potential toxicity and biocompatibility concerns
Solution Approach 1:
The patent introduces catalase as an intermediary substance that scavenges H2O2. The microneedle patch contains both glucose oxidase (for glucose detection and H2O2 generation) and catalase (for H2O2 decomposition). This dual-enzyme system allows the beneficial H2O2-triggered insulin release while eliminating the harmful effects of H2O2 accumulation through catalase-mediated decomposition into water and oxygen
Solution Approach 2:
The patent converts the harmful H2O2 byproduct into a beneficial trigger signal. The H2O2 generated by glucose oxidase is not discarded as waste but instead serves as the activation signal for micelle dissociation and insulin release. Simultaneously, catalase converts excess H2O2 into harmless water and oxygen, transforming a toxic byproduct into a safe end product
3Ease of operation
If open-loop subcutaneous injection of insulin is used, then insulin delivery is simple, but it cannot regulate blood glucose levels tightly and is associated with risk of severe hypoglycemia
Solution Approach 1:
The patent creates a self-regulating insulin delivery system where the microneedle patch autonomously responds to glucose levels. Glucose oxidase detects glucose concentration and triggers H2O2 generation, which automatically causes micelle dissociation and insulin release. The system self-adjusts insulin delivery based on real-time glucose levels without external control, eliminating the need for manual dosing decisions while maintaining simplicity of use
Solution Approach 2:
The patent implements a chemical feedback loop where glucose levels directly control insulin release. Elevated glucose triggers glucose oxidase to produce H2O2, which triggers micelle dissociation and insulin release. As insulin lowers blood glucose, the feedback signal diminishes, automatically reducing further insulin release. This closed-loop feedback mechanism prevents both hyperglycemia and hypoglycemia without requiring external monitoring or adjustment
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The microneedle patches provide rapid and controlled insulin release in response to hyperglycemic conditions, effectively regulating blood glucose levels while minimizing toxicity and biocompatibility concerns, and reducing the risk of hypoglycemia.
Implementation Method 1
GOx catalyzes the oxidation of glucose to gluconic acid in the presence of oxygen and generates hydrogen peroxide (H2O2)
Implementation Method 2
GOx catalyzes the oxidation of glucose
Implementation Method 3
the insulin dissociates from the micelle in an acidic and oxidative environment
Implementation Method 4
the microneedles are coated with H2O2 scavenging enzyme
Data Source
AI summary
Disclosed are compositions and methods for microneedle patches comprising diblock copolymer micelles designed for pH cascade and H2O2 triggered insulin delivery.