Blood Test Axial Light Loss C. diff Diagnosis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for diagnosing Clostridium difficile (C. diff.) infection, such as stool tests, are invasive, time-consuming, and not always reliable, particularly for recurrent infections, and do not effectively differentiate between infected and non-infected patients, leading to unnecessary testing and high healthcare costs.
Innovation Solution
A method involving a blood test that analyzes complete blood count parameters like axial light loss and the ratio of lymphocytes to monocytes using flow cytometry or Coulter counters to diagnose and differentiate C. diff. infections, allowing for the identification of patients with or at risk for recurrent infections without requiring stool samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stool tests are used to diagnose C. diff. infection, then the presence of toxin or bacterial DNA can be detected, but the testing process is invasive, time-consuming, and not always reliable
Solution Approach 1:
The patent uses circulating immune cells in blood as an intermediary marker to indirectly detect C. diff. infection. Instead of directly testing for toxin or bacterial DNA in stool, the method measures light scattering properties of immune cells that have been exposed to C. diff. toxins, providing a non-invasive alternative that maintains diagnostic reliability
Solution Approach 2:
The patent replaces the mechanical/stool-based testing system with a blood-based optical measurement system. By using light scattering measurements on circulating immune cells, the method eliminates the need for invasive stool collection while maintaining the ability to detect infection
2Measurement precision
If multiple stool tests are ordered over several days to confirm CDI, then diagnostic accuracy improves, but healthcare costs and time consumption increase significantly
Solution Approach 1:
The patent performs preliminary detection using a single blood test that measures light scattering properties of circulating immune cells. This preliminary action provides rapid diagnostic information within hours, eliminating the need for multiple sequential stool tests ordered over several days while maintaining diagnostic accuracy
Solution Approach 2:
The blood test method serves multiple functions simultaneously: it detects active infection, assesses immune response, and provides rapid results in a single test, replacing the need for multiple specialized stool tests ordered over time
3Reliability
If stool samples are collected for testing, then direct evidence of toxin presence is obtained, but patients may not be able to provide samples after surgery, and ostomy patients present additional problems
Solution Approach 1:
The patent creates a universal diagnostic method using blood-based light scattering measurements that can be applied to all patient populations regardless of surgical status or ostomy presence. Since blood collection is universally feasible and circulating immune cells reflect systemic immune response to C. diff. toxins, the method adapts to all patients including those who cannot provide stool samples
4Measurement precision
If PCR or LAMP tests are used to detect bacterial DNA, then sensitivity improves, but the tests are more costly and require molecularly trained staff
Solution Approach 1:
The patent replaces complex molecular biology systems (PCR, LAMP) with a simpler optical measurement system. By measuring light scattering properties of circulating immune cells using standard flow cytometry or light scattering instruments, the method achieves detection sensitivity without requiring molecularly trained staff or complex PCR equipment
Solution Approach 2:
The patent uses a simple, cost-effective optical measurement approach that does not require expensive molecular reagents, specialized equipment, or highly trained personnel. The method uses standard blood collection tubes and light scattering measurements that can be performed with常规 equipment, reducing both cost and complexity
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 non-invasive, rapid, and accurate means to diagnose C. diff. infections and predict recurrence, reducing healthcare costs and improving patient management by identifying those who need alternative therapeutic strategies.
Implementation Method 1
the different cell types, such as neutrophils, lymphocytes, monocytes, eosinophils, and early granulocytes, in the sample are resolved such as with a flow cytometer. Then, a value for a measurable property of one or more of the resolved cell types, such as axial light loss, is obtained for each of the cell types.
Implementation Method 2
a blood test that analyzes complete blood count parameters like axial light loss and the ratio of lymphocytes to monocytes using flow cytometry or Coulter counters
Data Source
AI summary
Methods are described for identifying CDI patients as well as CDI patients at risk for recurrence. Embodiments include: (1) flow cytometry of circulating peripheral blood mononuclear cells (PBMC) to phenotype for the less efficient immunoglobulin response to bacterial toxins and surface antigens that characterizes patients who will become recurrent; (2) stratification by means of complete blood count (CBC) using a Coulter counter to detect the differences in lower angle light scatter (LAL), which has a larger range in the recurrent population; and (3) stratification by means of complete blood count (CBC) using a Coulter counter to detect the lower axial light loss (AL2) exhibited in recurrent patients.