Microneedle ISF Monitoring With Electromagnetic Sample Transport
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current monitoring solutions for biological fluids, such as continuous blood glucose monitoring, face challenges with biocompatibility issues due to foreign body reactions and unreliable non-invasive methods like sweat analysis, making them unsuitable for clinical applications.
Innovation Solution
A wearable biofluid monitoring system using microneedles and electromagnetic-pneumatic pump/valve technology to extract interstitial fluid (ISF) for continuous monitoring, minimizing biocompatibility issues and enabling reliable out-of-body analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If implantable enzymatic sensors are used for continuous blood glucose monitoring, then continuous monitoring capability is achieved, but biocompatibility issues arise due to foreign body reactions
Solution Approach 1:
The patent extracts the sensing function from the body by using a wearable device that collects interstitial fluid externally through microneedles, rather than implanting sensors inside the body. This eliminates foreign body reactions while maintaining continuous monitoring capability.
Solution Approach 2:
The patent uses interstitial fluid as an intermediary medium to indirectly measure blood glucose levels. Instead of directly sensing blood glucose through implanted sensors, the system extracts ISF containing glucose metabolites and uses enzymatic sensors to detect glucose levels in this external fluid sample.
2Reliability
If non-invasive sweat analysis is used, then biocompatibility is improved, but reliability deteriorates due to poor correlation between sweat glucose and blood glucose
Solution Approach 1:
The patent uses interstitial fluid as a more reliable intermediary than sweat. ISF directly bathes the tissues and contains metabolites that closely reflect blood composition, providing a better correlation with blood glucose levels compared to sweat, which is influenced by external factors like exercise and hydration.
Solution Approach 2:
The patent replaces the mechanical/sweat-based non-invasive approach with a microneedle-based ISF extraction system. The microneedles penetrate only the epidermis to access ISF, combining the benefits of minimal invasivity with improved measurement accuracy through direct tissue fluid sampling.
3Reliability
If continuous ISF extraction is performed using wearable devices, then biocompatibility is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into a single integrated wearable device: microneedles for ISF extraction, microfluidic channels for fluid transport, enzymatic sensors for glucose detection, and wireless communication for data transmission. This integration reduces overall system complexity despite the advanced functionalities.
Solution Approach 2:
The wearable device is designed with multi-functionality to handle various aspects of ISF analysis within a single platform. The device can extract ISF, separate components, detect multiple analytes, and communicate results, making it a universal monitoring solution that reduces the need for multiple separate components.
Data Source
AI summary
Methods, systems, and apparatus, including biological fluid monitoring systems comprising a microneedle layer; at least one electromagnet assembly; and at least two liquid chambers coupled via a microfluidic layer, wherein the microneedle layer comprises a plurality of microneedles configured to extract interstitial fluid (ISF) from a patient in to one of the at least two liquid chambers, and wherein the at least one electromagnet assembly is configured to a move a test sample of the extracted ISF through the at least two liquid chambers to conduct a test cycle.