Paper-Based Microfluidic Pathogen Detection Kit
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Solution Overview
Problem
Current pathogen detection methods require laboratory equipment and trained personnel, making them costly, time-consuming, and inaccessible to individuals without routine healthcare access, limiting the dissemination of disease screening, especially in disadvantaged populations.
Innovation Solution
A test kit and method using isothermal rolling-circle amplification (RCA) in a single reaction vessel at near-room temperature, eliminating the need for laboratory equipment, allowing for on-site detection of pathogen polynucleotides with a padlock probe, ligase, primer, polymerase, reporter probe, and reaction buffer, and visual detection on a test strip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PCR-based laboratory tests are used for pathogen detection, then sensitivity and accuracy are improved, but device complexity and cost increase, requiring expensive laboratory equipment and trained personnel
Solution Approach 1:
The patent replaces complex mechanical laboratory equipment with a simple paper-based microfluidic device that utilizes capillary action for fluid transport. The PCR amplification and detection processes are integrated into a single-use paper cartridge that requires no external power source or complex instrumentation, thereby substituting mechanical systems with passive physical-chemical processes while maintaining detection sensitivity
Solution Approach 2:
The patent creates a simplified copy of the laboratory PCR process that can be performed outside traditional lab settings. By transferring the essential amplification and detection functions onto a paper-based platform with pre-loaded reagents and controls, the system replicates laboratory-grade detection capability in a portable, equipment-free format
2Measurement precision
If PCR-based laboratory tests are used for pathogen detection, then detection accuracy is improved, but loss of time increases as tests may take weeks to process
Solution Approach 1:
The patent combines multiple separate laboratory steps (sample preparation, nucleic acid extraction, PCR amplification, and detection) into a single integrated paper-based workflow. This consolidation eliminates intermediate handling steps and reduces the overall testing timeline from weeks to a single day while preserving analytical accuracy through built-in controls and optimized reagent formulations
3Reliability
If traditional laboratory infrastructure is used for pathogen detection, then reliability of testing is improved, but ease of operation worsens due to requirement for trained personnel and specialized facilities
Solution Approach 1:
The paper-based device incorporates built-in controls and visual readout mechanisms that enable users to perform reliable pathogen detection without specialized training. The system self-regulates critical parameters through its design (e.g., capillary-driven fluid flow, temperature-dependent reactions) and provides intuitive visual results, eliminating the need for operator interpretation or complex equipment operation while maintaining testing reliability
4Ease of operation
If self-sampling techniques with laboratory testing are used, then accessibility to testing is improved, but loss of time remains significant as samples must be mailed to diagnostics laboratories
Solution Approach 1:
The patent creates a universal testing platform that combines both sample collection and analysis functions in a single portable device. The paper-based microfluidic cartridge can process various sample types (swabs, saliva, urine) and performs all necessary processing steps locally, eliminating the need for separate mailing and laboratory processing steps while maintaining ease of self-sampling
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
Enables rapid, cost-effective, and portable pathogen detection without laboratory equipment, providing immediate results and improving disease prevention and treatment accessibility in medically underserved areas.
Implementation Method 1
a padlock probe comprising a 5′ end complementary to a first section of the pathogen polynucleotide and a 3′ end complementary to a second section of the pathogen polynucleotide
Implementation Method 2
a ligase
Implementation Method 3
a polymerase
Implementation Method 4
wicking the mixture into a test strip
Data Source
AI summary
Kits and methods for detecting pathogens without the need for laboratory equipment are disclosed. The kits and methods described herein allow for near-room temperature amplification of pathogen polynucleotides in a biological sample in a one-compartment reaction vessel. The kits and methods may be used to detect any target nucleic acid, such as DNA or RNA from a bacterial, fungal, or viral pathogen.