Microneedle Glucose Sensor Layers for Low-Latency Sensitivity

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Solution Overview

Problem

Conventional continuous glucose monitoring (CGM) devices suffer from tissue trauma, signal latency, and limited accuracy due to pain during insertion and slow diffusion of glucose analytes, leading to inconsistent sensitivity and increased sensor variability.

Innovation Solution

A microneedle-based continuous analyte monitoring system with a biorecognition layer containing a polymer and interferent blocking agent to fill voids, reducing exposure to interferents, and a diffusion-limiting layer to enhance stability and accuracy, combined with an attachment enhancer to improve sensor adherence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional electrochemical sensors are used for continuous glucose monitoring, then continuous detection capability is achieved, but tissue trauma and pain occur during insertion

Engineering Contradiction:

Improvecontinuous detection capabilityVSAvoidtissue trauma and pain

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The sensor is divided into multiple microneedles arranged in an array, where each microneedle is individually inserted into the skin. This segmentation allows for distributed sensing across multiple sites, reducing the trauma at any single insertion point while maintaining continuous detection capability through the collective operation of all microneedles.

Inventive Principle:

Principle #1Segmentation

2Productivity

If conventional CGM devices are used, then continuous glucose monitoring is achieved, but signal latency occurs due to diffusion time

Engineering Contradiction:

Improvecontinuous monitoringVSAvoidsignal latency

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent transitions from subcutaneous implantation (deep tissue) to intradermal placement (shallow tissue) using microneedles. This dimensional change in insertion depth places the sensor much closer to the blood capillaries, dramatically reducing the diffusion distance for glucose and eliminating signal latency while maintaining continuous monitoring capability.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Measurement precision

If microneedles are inserted deeper to access blood glucose directly, then measurement accuracy improves, but pain and tissue trauma increase

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidpain and tissue trauma

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent uses the interstitial fluid as an intermediary medium. Instead of directly accessing blood glucose through deep insertion, the microneedles access interstitial fluid which is in equilibrium with blood glucose levels. This intermediary approach provides accurate glucose measurements while keeping the insertion depth shallow enough to avoid pain and tissue trauma.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Stability of the object's composition

If polymer layers are used in the sensor structure, then sensor stability improves, but interferent access to the electrode increases

Engineering Contradiction:

Improvesensor stabilityVSAvoidinterferent access

Core Design Contradiction:

Stability of the object's compositionVSObject-generated harmful factors

Solution Approach 1:

The patent applies different properties to different regions of the polymer layer. The upper portion of the polymer layer is designed with properties that block interferents (such as ascorbic acid and uric acid) from reaching the electrode, while the lower portion maintains properties that allow glucose to pass through. This local differentiation of polymer properties simultaneously achieves interferent blocking and glucose permeability.

Inventive Principle:

Principle #3Local quality

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 system provides improved sensitivity, selectivity, and stability, minimizing interference and variability, enabling real-time glucose monitoring with reduced pain and faster response times.

Implementation Method 1

a biorecognition element configured to react with the analyte

Methodology Applied

Scientific EffectEnzyme reaction: Enzyme

Implementation Method 2

an interferent blocking agent that fills voids within the polymer

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 3

a diffusion-limiting layer on the biorecognition layer

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS12629060B2Method for improved sensor sensitivity of a microneedle-based continuous analyte monitoring system

Publication Date: 2026.05.19 BIOLINQ INC

AI summary

Described herein are variations of an analyte monitoring system, including an analyte monitoring device. For example, an analyte monitoring device may include an implantable microneedle array for use in measuring one or more analytes (e.g., glucose), such as in a continuous manner. Each microneedle of the microneedle array may include a microneedle body, an electrode material on the microneedle body, a biorecognition layer on the electrode material, a diffusion-limiting layer on the biorecognition layer, an interferent blocking agent, and/or an attachment enhancer between the biorecognition layer and the diffusion-limiting layer, where the interferent blocking agent and the attachment enhancer are configured to improve sensor sensitivity variability.