Magnetic Pathogen Isolation From Blood for Rapid Low-Level Detection
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Solution Overview
Problem
Existing methods for detecting blood-borne pathogens, such as bacteria, are time-consuming and require enrichment steps that can compromise sensitivity, often leading to delayed diagnosis and increased risk of sepsis.
Innovation Solution
The use of magnetic particles conjugated to pathogen-specific antibodies to isolate pathogens directly from blood samples, allowing for rapid detection at low concentrations without additional enrichment, using a magnetic field to capture and separate pathogen-magnetic particle complexes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If molecular detection methods (hybrid capture or PCR) are used, then detection sensitivity is improved, but the requirement for high concentrations of purified DNA and additional enrichment steps increases time consumption
Solution Approach 1:
The patent applies preliminary action by pre-conjugating magnetic particles with pathogen-specific antibodies before sample analysis. This pre-prepared reagent system eliminates the need for time-consuming DNA purification and enrichment steps during actual detection, while maintaining high sensitivity through the pre-optimized antibody-particle complexes that can directly capture and concentrate pathogens from clinical samples
Solution Approach 2:
The patent extracts the pathogen capture function from complex molecular detection procedures by using magnetic particles conjugated with antibodies to directly isolate pathogens from samples. This extraction approach eliminates the need for DNA purification and enrichment steps, reducing time consumption while maintaining detection sensitivity through direct pathogen isolation and subsequent molecular analysis
2Productivity
If antigen detection or metabolite detection methods are used, then detection speed is improved, but the limit of detection remains high (> 10^4 CFU/ml) requiring large amounts of bacteria
Solution Approach 1:
The patent merges the advantages of both rapid antigen detection and sensitive molecular detection by combining magnetic particle-based pathogen isolation with subsequent molecular analysis. The magnetic particles rapidly capture pathogens from samples, and the isolated pathogens are then analyzed using sensitive molecular methods, achieving both fast detection speed and low limit of detection (1 CFU/ml) without requiring large amounts of bacteria
Solution Approach 2:
The patent uses magnetic particles conjugated with antibodies as an intermediary to bridge the gap between rapid detection and sensitive detection. These intermediary particles rapidly capture and concentrate even trace amounts of pathogens from clinical samples, enabling subsequent sensitive molecular detection to achieve low limits of detection while maintaining fast overall detection speed
3Measurement precision
If enrichment steps are performed to increase pathogen concentration, then detection sensitivity is improved, but the time required for diagnosis is increased and sensitivity may be compromised
Solution Approach 1:
The patent replaces traditional mechanical enrichment steps (such as centrifugation, filtration, or culture-based concentration) with a magnetic field-based isolation system. Magnetic particles conjugated with antibodies selectively capture pathogens from samples, and an external magnetic field rapidly concentrates these particle-pathogen complexes. This mechanical substitution achieves effective pathogen enrichment in minutes without compromising detection sensitivity or requiring time-consuming traditional enrichment procedures
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 early and accurate detection of pathogens at very low levels (1 CFU/ml) in blood samples, facilitating timely patient treatment decisions.
Implementation Method 1
a magnetic field is applied to capture pathogen/magnetic particle complexes on a surface
Data Source
AI summary
Provided are methods of using compositions that include sets of magnetic particles, members of each set being conjugated to an antibody specific for a pathogen, and magnets to isolate a pathogen from a body fluid sample.