Biofluid Sensing Device with Microneedle Arrays for Lag Time Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current biosensing technologies face challenges in lag time and continuous sensing of analytes in non-sweat biofluids like interstitial fluid, where sensor responses can be delayed by 10-30 minutes, while sweat analyte concentrations may change rapidly, limiting the accuracy and reliability of health monitoring.
Innovation Solution
A biofluid sensing device system that integrates advanced microfluidics and sensor technologies to enable simultaneous and continuous monitoring of analytes in both sweat and interstitial fluid, using microneedle arrays for diffusion and wicking components for sweat transport, along with iontophoresis for sweat stimulation, to provide rapid and precise data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If sensors are implanted in interstitial fluid to detect analytes, then continuous sensing capability is achieved, but lag time increases to 10-30 minutes
Solution Approach 1:
The system is divided into two separate sensing subsystems: one for interstitial fluid (providing continuous monitoring) and one for sweat (providing rapid response). Each subsystem targets a different biofluid with distinct temporal characteristics, allowing the overall system to overcome the lag time limitation of single-subsystem approaches.
Solution Approach 2:
Sweat acts as an intermediary medium that reflects blood analyte concentrations with minimal lag time (1-3 minutes). By measuring analytes in sweat rather than directly in interstitial fluid, the system obtains rapid responses that closely track blood glucose changes, effectively using sweat as a mediator to bypass the slow interstitial fluid turnover.
2Speed
If sweat is used alone for sensing analytes, then rapid response time is achieved, but analyte concentration precision decreases due to dilution
Solution Approach 1:
The system merges data from two sensing modalities: sweat-based rapid detection and interstitial fluid-based precise measurement. By combining these complementary approaches, the system achieves both rapid response times (from sweat) and high measurement precision (from interstitial fluid), overcoming the limitations of using either modality alone.
3Adaptability or versatility
If multiple biofluids are monitored simultaneously, then comprehensive health information is obtained, but device complexity increases
Solution Approach 1:
The device employs universal sensing components that can detect multiple analytes (glucose, lactate, electrolytes) across both sweat and interstitial fluid compartments. This multi-functionality allows comprehensive health monitoring without proportionally increasing device complexity, as the same sensor technology is applied to different biofluids.
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 achieves superior biosensing by reducing lag time and providing continuous, accurate data on analyte concentrations in interstitial fluid, complementing sweat sensing to enhance health monitoring and diagnosis.
Implementation Method 1
microneedle arrays for diffusion
Implementation Method 2
wicking components for sweat transport
Implementation Method 3
iontophoresis for sweat stimulation
Data Source
AI summary
A system 100, 200 for sensing one or more analytes in a first biofluid and a second biofluid and methods of using said system. The system 100, 200 may include a first subsystem 102, 200a, 200b with a first sensor 120, 122, 220, 222 for sensing a first analyte in the first biofluid and a second subsystem 104, 200b, 200c with a second sensor 124, 126, 222, 224 for sensing a second analyte in the second biofluid. The second analyte may be the same as or different from the first analyte and the second biofluid may be different from the first biofluid. In an embodiment, the first biofluid is a non-sweat biofluid and the second biofluid is sweat. The system 100, 200 may be used to detect lag time for measuring an analyte in one of the biofluids.