Rapid Bacterial Detection via Selective ATP Elimination
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Solution Overview
Problem
Current methods for diagnosing prosthetic joint infection (PJI) are slow and unreliable, often leading to delayed treatment and increased complications due to the time-consuming nature of traditional bacterial culture tests and the inability to detect sessile or biofilm-embedded bacteria.
Innovation Solution
A portable device with a disposable cartridge system that uses ATP-reactive enzymes and luciferin/luciferase to rapidly detect bacterial ATP in fluid samples by eliminating somatic cell ATP and selectively disrupting bacterial cells, allowing for quick identification of bacterial infections through light signal emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional bacterial culture testing is used to diagnose PJI, then diagnostic accuracy is improved, but treatment time is significantly delayed (24-96 hours or up to two weeks)
Solution Approach 1:
The diagnostic process is divided into two distinct phases: (1) a rapid screening phase using ATP bioluminescence detection that provides immediate results, and (2) a confirmatory phase using traditional culture methods. This segmentation allows clinicians to obtain preliminary diagnostic information within minutes while maintaining the option for definitive confirmation through established methods, thereby resolving the time-accuracy contradiction.
Solution Approach 2:
The ATP-based detection method performs preliminary diagnostic screening before committing to prolonged culture procedures. By conducting this preliminary action using a rapid assay, clinicians can make immediate treatment decisions or identify high-risk cases requiring urgent intervention, while culture results provide later confirmation. This preliminary action eliminates the mandatory waiting period of traditional methods.
2Loss of time
If ATP-based rapid detection method is used, then treatment time is reduced (results within minutes), but measurement precision deteriorates due to interference from somatic cell ATP
Solution Approach 1:
The patent employs selective lysis agents that extract and destroy somatic cell ATP while leaving bacterial ATP intact. This extraction process removes the interfering substance (somatic cell ATP) from the sample, allowing the subsequent bioluminescence assay to measure only bacterial ATP. This selective removal resolves the precision problem by eliminating the source of false-positive signals.
Solution Approach 2:
Selective lysis agents and enzymes act as intermediaries between the sample and the detection system. These intermediaries specifically target and degrade somatic cell ATP through enzymatic hydrolysis, while bacterial ATP remains protected or becomes the sole substrate for the luciferase reaction. This intermediary step purifies the signal source, enabling accurate bacterial detection despite the presence of abundant somatic cell ATP.
3Measurement precision
If selective lysis agents are used to disrupt bacterial cells, then bacterial ATP detection sensitivity is improved, but non-bacterial cells may also be disrupted causing false positives
Solution Approach 1:
The patent employs reagents with locally optimized properties: selective lysis agents that specifically target bacterial cell wall structures (such as peptidoglycan in Gram-positive bacteria or outer membrane components in Gram-negative bacteria) while sparing eukaryotic cells, and enzymes with specific substrate recognition that distinguish bacterial ATP from somatic cell ATP. This local quality differentiation ensures that only bacterial cells are disrupted and their ATP detected, eliminating false positives while maintaining high sensitivity.
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, sensitive, and specific detection of bacterial infections at the bedside or in a physician's office, reducing treatment delays and improving patient outcomes by providing immediate results within minutes.
Implementation Method 1
The first chamber eliminates somatic cell ATP through enzymatic hydrolysis
Implementation Method 2
detects the presence of bacterial ATP in a second chamber... by emission of radiation, such as a light signal
Data Source
AI summary
A method and apparatus detects and optionally determines the amounts of bacteria in a fluid sample that may include non-bacterial cells, such as somatic cells. The device has a processing chamber for receiving the sample. The processing chamber includes a somatic cell lysis agent that preferentially disrupts somatic cells to release their contents including somatic cell-derived ATP. The somatic lysis agent is selected to leave bacterial cells intact. The processing chamber also holds a plurality of beads that have an ATP-reactive enzyme, such as ATPase, bound to their surfaces. The somatic cell-derived ATP and endogenous ATP in the sample are eliminated by reaction with the ATP-reactive enzyme. Once the reaction reaches an end point, the sample is transferred to a detection chamber while the beads and the bound ATP-reactive enzymes are retained in the processing chamber. The detection chamber holds a bacterial cell lysis agent that disrupts bacteria that might be present in the sample to release bacterial cell-derived ATP. A light-emitting reagent that reacts with ATP, such as luciferin/luciferase, is provided in the detection chamber. A light sensor monitors the detection chamber to determine if light is emitted, indicating the presence and optionally the amount of bacteria in the fluid sample.