Immunoassay Sample Prep for Microbial Detection
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Solution Overview
Problem
Current methods for diagnosing microbial infections, such as native joint infection and periprosthetic joint infection, face challenges with false negative results and poor clinical sensitivity due to damaged bacteria and antimicrobial substances, limiting the effectiveness of culture-based methods and direct detection techniques like immunoassays and PCR.
Innovation Solution
A biological sample preparation method involving a combination of enzymes, detergents, and heat treatment is used to increase the availability of microorganism antigens for detection, followed by immunoassay techniques to directly detect and identify bacteria and fungi in synovial fluid samples, even in culture-negative cases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If culture-based methods are used to detect microorganisms, then the gold standard for diagnosis is achieved, but the time-to-results is long (several days to weeks) and false negative rates are high
Solution Approach 1:
The patent extracts and detects specific microbial antigens directly from patient samples using immunoassay techniques, bypassing the need for prolonged culture growth. This extraction approach allows rapid identification of microorganisms without waiting for culture results, resolving the contradiction between diagnostic reliability and time-to-results.
Solution Approach 2:
The patent performs preliminary detection of microbial antigens before culture results are available. By using immunoassays to detect antigens in advance, the system provides early diagnostic information that guides treatment decisions while culture results are still pending, thus reducing the effective time-to-results without sacrificing diagnostic accuracy.
2Loss of time
If direct detection methods like immunoassay and PCR are used, then time-to-results is reduced, but sensitivity and specificity are poor and false negative results increase
Solution Approach 1:
The patent optimizes multiple parameters of the immunoassay system including antibody selection, sample preparation conditions, and detection thresholds. By carefully adjusting these parameters, the system achieves both rapid results and high sensitivity/specificity, resolving the contradiction between speed and reliability of direct detection methods.
Solution Approach 2:
The patent uses specifically selected antibodies as intermediaries to detect microbial antigens. These antibodies serve as mediators that enhance the sensitivity and specificity of the detection system, allowing accurate identification of microorganisms through rapid immunoassay methods without the time delay of culture techniques.
3Reliability
If sample preparation techniques are applied to separate, purify or concentrate bacterial antigen, then detection sensitivity is improved, but the complexity of the overall method increases
Solution Approach 1:
The patent employs a universal sample preparation protocol that effectively separates, purifies, and concentrates bacterial antigens using a standardized approach. This multi-functional preparation method works across different sample types and microbial targets, improving detection sensitivity while maintaining consistent procedural complexity rather than requiring separate complex protocols for each scenario.
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 enhances the sensitivity and specificity of microbial detection, allowing for accurate diagnosis of infections, particularly when traditional culture methods fail, and provides information on the type of infecting microorganism to inform antibiotic treatment.
Implementation Method 1
A biological sample preparation method involving a combination of enzymes, detergents, and heat treatment is used to increase the availability of microorganism antigens for detection
Implementation Method 2
A biological sample preparation method involving a combination of enzymes, detergents, and heat treatment is used to increase the availability of microorganism antigens for detection
Implementation Method 3
A biological sample preparation method involving a combination of enzymes, detergents, and heat treatment is used to increase the availability of microorganism antigens for detection
Implementation Method 4
followed by immunoassay techniques to directly detect and identify bacteria and fungi in synovial fluid samples
Data Source
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AI summary
Methods are provided for preparing patient samples for direct detection and identification of microorganisms in the patient samples using multiplex immunoassays. The method includes enzymatic treatment of the patient sample, boiling and centrifugation of the sample to provide a treated sample that may be used in an immunoassay. There are also provided immunoassay compositions and systems for the direct detection and identification of microorganism in patient tissue.