Urine Headspace Gas Sensor Array for Prostate Cancer Risk Assessment
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Solution Overview
Problem
Current methods for assessing prostate cancer risk and aggressiveness are invasive, have low accuracy, and are prone to complications, while existing non-invasive methods like PSA screening and canine olfactory systems have limitations in sensitivity and specificity.
Innovation Solution
The use of three metal oxide semiconductor-based gas sensors (SnO2, ZnO, and combinations with TiO2 and Nb2O5) to analyze the heated urine headspace, excluding the last jet of naturally voided urine, in a humidity-controlled environment, to assess prostate cancer risk and aggressiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PSA-based screening is used to detect prostate cancer, then mortality reduction is achieved, but over-diagnosis and overtreatment of indolent cancer occur due to low specificity
Solution Approach 1:
The patent segments the detection task by using multiple sensor types (MOX, QCM, SAW) to detect different volatile organic compounds separately, then integrates their results to achieve both high sensitivity and specificity, avoiding the over-diagnosis problem of single-marker PSA screening
Solution Approach 2:
The patent employs composite sensor systems combining different material types (metal oxide semiconductors, quartz crystal microbalances, surface acoustic wave devices) to create a multi-parameter detection system that distinguishes cancer-specific VOC patterns from benign conditions, thereby improving specificity while maintaining mortality reduction benefits
2Measurement precision
If biopsy sampling is performed to improve diagnosis accuracy, then detection accuracy increases, but invasive procedures and complications (sepsis, death) occur
Solution Approach 1:
The patent replaces the mechanical invasive biopsy procedure with a non-invasive electronic nose system that detects volatile organic compounds in urine, providing high detection accuracy (sensitivity and specificity both >90%) without physical intrusion into the body, thereby eliminating biopsy-related complications
Solution Approach 2:
The patent uses urine as an intermediary medium that contains volatile organic compounds reflecting prostate condition, allowing indirect assessment of prostate health without direct contact with the prostate tissue, thus achieving accurate diagnosis without invasive procedures
3Measurement precision
If canine olfactory system is used to detect prostate cancer VOCs, then sensitivity and specificity reach 97%, but training and housing requirements create complexity
Solution Approach 1:
The patent creates an artificial copy of the canine olfactory system using electronic sensors (MOX, QCM, SAW) that simulate biological odor detection, achieving comparable sensitivity and specificity (90%+) without requiring animal training or housing infrastructure
Solution Approach 2:
The patent employs relatively simple, inexpensive electronic sensor components that can be manufactured and deployed without the ongoing costs of animal care, training facilities, and ethical oversight required for canine detection systems
4Measurement precision
If prostatectomy is performed to assess cancer aggressiveness, then accurate staging and grading are achieved, but invasive surgery is required
Solution Approach 1:
The patent replaces surgical prostatectomy with non-invasive volatile organic compound analysis using electronic nose technology, providing cancer aggressiveness assessment through metabolic fingerprinting without surgical intervention
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
This approach provides a more reliable, non-invasive method for assessing prostate cancer risk and aggressiveness with improved sensitivity and specificity, reducing the need for invasive procedures and overcoming the limitations of existing methods.
Implementation Method 1
analysing the gaseous headspace of urine samples with at least three metal oxide semiconductor-based gas sensors
Implementation Method 2
heating the sample to above 50°C in a closed, humidity-controlled environment
Data Source
AI summary
Disclosed are methods for assessing the risk that a male subject is affected by prostate cancer and to methods for assessing the risk that such cancer is aggressive, by analysing the gaseous headspace of urine samples with at least three metal oxide semiconductor-based gas sensors, wherein the metal oxide of the first gas sensor is pure or doped SnO2, the metal oxide of the second sensor is pure or doped ZnO and the metal oxides of the third sensor are pure or doped SnO2, pure or doped TiO2 and pure or doped Nb2O5.