Glucose-Responsive Microneedle Patches for Closed-Loop Insulin Delivery
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Solution Overview
Problem
Current insulin delivery systems for diabetes, such as open-loop subcutaneous injections, fail to mimic the natural regulation of blood glucose levels achieved by pancreatic β-cells, leading to poor glucose control and associated complications, and existing closed-loop systems face challenges in accuracy and sensor reliability, along with issues like low insulin loading capacity, complex administration, and biocompatibility concerns.
Innovation Solution
Development of microneedle patches loaded with glucose-responsive copolymers, specifically poly(N-vinylpyrrolidone-co-2-(dimethylamino)ethyl acrylate-co-3-(acrylamido)phenylboronic acid, which release insulin in hyperglycemic conditions, utilizing ethylene glycol dimethacrylate as a crosslinker to ensure rapid and controlled insulin delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional open-loop subcutaneous injection is used for insulin administration, then insulin delivery is simple, but it cannot match the exquisite regulation of blood glucose achieved by pancreatic β-cells
Solution Approach 1:
The microneedle patch system performs self-service by autonomously sensing glucose levels through the glucose-responsive copolymer matrix and automatically releasing insulin in response to hyperglycemia, eliminating the need for external monitoring or manual intervention while maintaining simplicity of application
Solution Approach 2:
The system implements feedback control where the glucose-responsive copolymer matrix detects blood glucose levels and triggers insulin release only when glucose exceeds a threshold, creating a closed-loop system that mimics pancreatic β-cell regulation while maintaining ease of use
2Reliability
If electronic closed-loop devices are developed for insulin delivery, then glucose-responsive behavior is improved, but challenges remain regarding algorithm accuracy and sensor reliability
Solution Approach 1:
The patent replaces electronic sensors and algorithms with a chemically-based glucose-responsive copolymer matrix that inherently senses glucose levels through molecular interactions, eliminating the need for complex electronic components while achieving reliable glucose-responsive insulin release
Solution Approach 2:
The system changes the response parameter from electronic signal processing to chemical parameter changes in the copolymer matrix, where glucose concentration directly alters the polymer's conformation and insulin release rate, simplifying the system while improving reliability
3Reliability
If chemically-engineered formulations with GOx, PBA, and GBP are used, then glucose-responsive insulin delivery is achieved, but sufficient insulin loading capacity for daily usage is not attained
Solution Approach 1:
The patent employs a composite copolymer matrix integrating multiple functional components (phenylboronic acid for glucose sensing, polyvinyl alcohol for structural integrity, and insulin binding moieties) into a single material system that simultaneously achieves glucose responsiveness and high insulin loading capacity
Solution Approach 2:
The microneedle structure nests multiple layers of insulin within the copolymer matrix, with the glucose-responsive mechanism nested within the polymer structure itself, enabling high insulin density while maintaining responsive release behavior
4Speed
If microneedle patches with glucose-responsive copolymers are used, then rapid in vivo glucose-responsive behavior is achieved, but manufacturing complexity increases
Solution Approach 1:
The copolymer matrix is pre-synthesized with embedded insulin and glucose-responsive functional groups during manufacturing, so that the rapid response capability is built-in beforehand, eliminating the need for complex post-processing or assembly steps while enabling fast in vivo response
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 effectively regulate blood glucose levels by releasing insulin in response to hyperglycemia, maintaining normoglycemia for extended periods without causing hypoglycemia, and demonstrate biocompatibility and sustained insulin bioactivity, addressing the limitations of existing systems.
Implementation Method 1
the insulin dissociates from the microneedle in anhyperglycemic environment
Implementation Method 2
rapid in vivo glucose-responsive behavior with a similar pharmacokinetics to pancreatic β-cells'
Data Source
AI summary
Disclosed are compositions and methods for microneedle patches comprising copolymer designed for glucose triggered insulin delivery. In one aspect, disclosed herein are microneedle patches comprising insulin loaded copolymers; wherein the insulin dissociates from the microneedle in an hyperglycemic environment; wherein the copolymer comprises poly(N-vinylpyrrolidone-co-2-N(dimethylamino)ethyl acrylate-co-3-(acrylamido)phenylboronic acid and methods of their use.