Needleless LOAC Device with Vibration Mixing and CNT Sensors
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Solution Overview
Problem
Current lab-on-a-chip devices face challenges with evaporation of pre-loaded liquid reagents, limited signal sensitivity due to reliance on a fluid sample contact layer, and the need for needle-based reagent dispensing, which is unsafe and inefficient for home use and saliva testing.
Innovation Solution
A lab-on-a-cartridge (LOAC) device with a needleless reagent dispenser and a vibration system to mix test fluid with liquid reagents, using carbon nanotube sensors for increased signal sensitivity and electrochemical reactions, allowing for external reagent input and whole-volume fluid testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a syringe needle is used to dispense liquid reagent, then the reagent can be injected into the receiving container, but the device becomes unsafe for home use and requires sterilization procedures
Solution Approach 1:
The patent removes the needle component from the dispensing system entirely. The liquid reagent is dispensed through a needleless mechanism that eliminates the need for needle penetration, sterilization, and disposal procedures, making the device safe for home use while maintaining dispensing functionality
Solution Approach 2:
The patent introduces a intermediary dispensing mechanism that transfers liquid reagent without direct needle contact. The system uses a controlled release mechanism that allows reagent transfer through a barrier or membrane, eliminating the need for needle-based injection while maintaining precise delivery
2Adaptability or versatility
If Lab-on-a-chip technology is used with pre-loaded liquid reagents, then the test package is self-contained, but the reagents evaporate and alter concentration affecting chemical reactions
Solution Approach 1:
The patent pre-loads the liquid reagent into a reservoir within the test cartridge, but designs the reservoir with evaporation prevention features such as sealed closures or humidity control mechanisms. The reagent is prepared in advance and protected from environmental factors until the moment of use, ensuring concentration stability
Solution Approach 2:
The patent creates a protected environment for the pre-loaded liquid reagent by sealing it in an inert or controlled atmosphere within the cartridge. This prevents evaporation and chemical degradation by isolating the reagent from air and environmental contaminants until the testing moment
3Device complexity
If Lab-on-a-chip technology relies on contact layer of fluid sample on biosensor surface, then the device structure is simplified, but the signal intensity is limited compared to whole-volume testing
Solution Approach 1:
The patent introduces a vibration mechanism that dynamically mixes the liquid reagent with the fluid sample in the test cavity. This dynamic mixing action enhances the contact between analytes and biosensors throughout the entire sample volume, increasing signal intensity while maintaining a relatively simple cartridge structure
Solution Approach 2:
The patent employs mechanical vibration to agitate and mix the reagent-sample mixture in the test cavity. The vibration promotes thorough mixing and maximizes the interaction between the fluid sample and biosensor surface, thereby enhancing signal intensity without requiring complex testing procedures
4Ease of operation
If saliva sample collection uses swab swiping method, then the test is non-invasive, but the sample volume is small leading to false negative results
Solution Approach 1:
The patent transitions from swab-based surface sampling to a liquid collection method that captures saliva in a three-dimensional volume within the test cartridge. The user spits or deposits saliva into a collection reservoir, allowing accumulation of a larger sample volume that provides sufficient analyte concentration for accurate detection
Solution Approach 2:
The patent creates a liquid-phase copy or alternative representation of the saliva sample that preserves the non-invasive collection advantage while enabling volume accumulation. Instead of transferring微量 saliva from a swab, the system directly collects and retains the liquid sample in a controlled environment, maximizing the usable sample volume
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 LOAC device enhances signal sensitivity and reaction efficiency by actively mixing reagents with test fluids, providing a safe and efficient point-of-care solution for saliva testing, reducing false negatives and improving diagnostic accuracy.
Implementation Method 1
a vibration system to mix test fluid with liquid reagents
Implementation Method 2
detection station for measuring the electrochemical reaction between the test fluid and the liquid reagent
Data Source
AI summary
A lab-on-a-cartridge (LOAC) handheld assay device including an integrated test cartridge, a carbon nanotube electrode sensor, and a reagent dispenser for dispensing a liquid reagent into the test cartridge. The test cartridge includes a syringe plunger for drawing a test fluid into a test cavity, a bottom wall with a reagent inlet port, and a vibration adaptor for mixing. The reagent input port is attached with a slit valve for engaging with a slit spout of the reagent dispenser as a needleless dispensing system. Carbon nanotube sensors of different three-electrode configurations are provided for testing a volume of test fluid to increase the electrochemical reaction sensitivity. The assay device can be used with a CNT three-electrode sensor for saliva testing for determining glucose concentration.