Electrochemical Sensor for Non-Invasive THC Detection
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Solution Overview
Problem
Current methods for detecting THC and other electrochemically active molecules in drivers are invasive, costly, and unable to provide real-time results at the point of contact, posing challenges for law enforcement in determining impairment.
Innovation Solution
A non-invasive device equipped with an electrochemical, voltammetric sensor that can detect THC and its metabolites in saliva without sample preparation, using a sensor with a hydrophobic coating to partition and oxidize the molecules, generating a voltammetric signal for rapid identification and quantification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive detection methods are used, then measurement precision is improved, but ease of operation deteriorates and device complexity increases
Solution Approach 1:
The patent replaces invasive mechanical sampling methods with a non-invasive electrochemical sensor that directly detects molecules in saliva through oral cavity contact. The sensor uses voltammetric detection with hydrophobic coating to selectively detect THC and metabolites without requiring blood draws or urine collection, thereby maintaining detection accuracy while dramatically improving ease of operation at the point of contact.
Solution Approach 2:
The patent introduces saliva as an intermediary medium between the user and the detection system. Instead of directly analyzing blood or urine through invasive procedures, the sensor detects electrochemically active molecules in saliva, which serves as a non-invasive intermediary that reflects drug presence while enabling point-of-contact testing.
2Measurement precision
If traditional detection methods are used, then measurement precision is improved, but loss of time increases and productivity decreases
Solution Approach 1:
The sensor is pre-coated with hydrophobic material that selectively partitions THC and its metabolites before contact with the saliva sample. This preliminary preparation enables immediate detection upon contact, eliminating the need for time-consuming sample preparation steps and providing real-time results while maintaining detection precision.
Solution Approach 2:
The patent replaces time-consuming laboratory-based detection methods with rapid electrochemical voltammetric measurement. The sensor performs direct molecular detection in saliva through electrical signal generation, reducing detection time from hours or days to minutes while maintaining or improving measurement precision through electrochemical specificity.
3Measurement precision
If complex detection systems are used, then measurement precision is improved, but device complexity increases and ease of manufacture deteriorates
Solution Approach 1:
The patent divides the detection system into two main segments: a disposable sensing unit containing the electrochemical sensor and hydrophobic coating, and a separate portable reader device. The sensing unit can be manufactured independently with simple materials and discarded after use, while the reader provides the electronic processing. This segmentation reduces the complexity of any single component and improves ease of manufacture while maintaining high measurement precision.
Solution Approach 2:
The patent employs a disposable sensing unit that can be manufactured from inexpensive materials and discarded after a single use. This approach eliminates the need for complex, expensive, reusable laboratory equipment, thereby reducing device complexity and improving ease of manufacture while maintaining detection precision through the use of optimized electrochemical sensors and hydrophobic coatings in each disposable unit.
4Measurement precision
If selective coating is applied to electrodes, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the hydrophobic coating parameters including material composition, coating thickness (typically 1-10 micrometers), and application method to achieve selective molecule detection. By carefully controlling these parameters, the sensor achieves high measurement precision for THC and metabolites while the coating process itself remains manufacturable using standard techniques such as dip-coating or spray-coating, thereby reducing the stringency of manufacturing precision requirements.
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, accurate, and non-invasive detection of THC and its metabolites in saliva, providing real-time data suitable for legal proceedings and public safety applications, overcoming the limitations of existing methods by being portable and cost-effective.
Implementation Method 1
using a sensor with a hydrophobic coating to partition and oxidize the molecules
Implementation Method 2
using a sensor with a hydrophobic coating to partition and oxidize the molecules, generating a voltammetric signal
Data Source
AI summary
This invention is directed to non-invasive devices and methods to detect electrochemically active molecules in a fluid sample of a subject.