Implantable Sensor for Prosthetic Joint Infection Detection
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Solution Overview
Problem
Post-surgical infections around prosthetic joint replacements are difficult to detect early, leading to ineffective treatment and potential reoccurrence, as symptoms are often masked and antibiotics struggle to reach bacteria embedded in biofilms, and current methods for addressing infections are invasive and costly.
Innovation Solution
An implantable sensor that monitors synovial fluid for specific peptides and proteins, such as α-defensin and C-reactive protein, using molecularly imprinted surfaces and charge-sensitive components to detect infection indicators, with an external device for signal transmission and power via inductive coupling, allowing for early detection and alerting medical intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If systemic antibiotics are used to treat periprosthetic joint infection, then treatment can be administered systemically, but the antibiotics cannot effectively reach bacteria embedded in biofilms on the prosthesis surface
Solution Approach 1:
The patent introduces a sensor as an intermediary device that detects infection biomarkers in synovial fluid, enabling early detection before biofilm becomes fully established. This mediator allows for timely intervention with antibiotics before the harmful biofilm barrier fully develops, resolving the contradiction by preventing the biofilm protection mechanism from taking full effect.
Solution Approach 2:
The sensor performs preliminary detection of infection markers (such as alpha-defensin and C-reactive protein) in synovial fluid before bacteria can establish a protective biofilm. This preliminary action enables treatment to begin at the earliest stages of infection, before the biofilm barrier prevents antibiotic penetration, thus resolving the effectiveness contradiction.
2Loss of time
If early detection of infection is implemented, then treatment can begin before biofilm formation, but current methods lack the capability to detect infection at early stages due to masked symptoms
Solution Approach 1:
The patent replaces the mechanical/clinical examination system with an electronic sensor system that detects biochemical markers in synovial fluid. Instead of relying on mechanical assessment of symptoms (which are masked), the electronic sensor directly measures infection biomarkers, eliminating the detection difficulty and time loss associated with clinical evaluation.
Solution Approach 2:
The sensor acts as an intermediary between the infection process and the detection system, measuring biomarkers (alpha-defensin, C-reactive protein) in synovial fluid. This intermediary approach bypasses the problem of masked symptoms by directly detecting biochemical evidence of infection, thereby reducing detection delay and overcoming the difficulty of early-stage detection.
3Reliability
If invasive surgery is performed to treat established infection, then bacteria can be directly accessed, but the procedure is traumatic, expensive, and delays tissue healing
Solution Approach 1:
The sensor enables preliminary detection and treatment of infection at early stages, before invasive surgery becomes necessary. By detecting infection markers early, the system allows for non-invasive antibiotic treatment to be administered before the infection establishes itself, thereby avoiding the need for traumatic surgical intervention while still achieving reliable infection treatment.
Solution Approach 2:
The sensor system performs preliminary anti-action by detecting infection early and enabling antibiotic treatment before the infection becomes established. This preliminary counter-measure prevents the need for invasive surgery by stopping the infection process at an early stage, thus resolving the contradiction between treatment reliability and surgical invasiveness.
4Reliability
If complete removal of prosthesis is performed to treat severe infection, then infected tissue can be fully accessed, but the procedure is traumatic and infection often reoccurs
Solution Approach 1:
The sensor enables preliminary detection and treatment of infection at early stages, preventing the need for complete prosthesis removal. By detecting infection markers before they become severe, the system allows for conservative treatment that eradicates infection without requiring the complex and traumatic procedure of removing the entire prosthesis, thereby avoiding infection reoccurrence while maintaining the prosthesis.
Solution Approach 2:
The sensor system performs preliminary anti-action by detecting and enabling treatment of infection before it becomes severe enough to require prosthesis removal. This early intervention prevents the need for complex surgical procedures and reduces the likelihood of infection reoccurrence, resolving the contradiction between infection eradication and treatment invasiveness.
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 prosthetic joint infections, reducing the need for invasive surgeries and improving treatment outcomes by alerting healthcare providers promptly, thereby minimizing complications and recurrence.
Implementation Method 1
molecularly imprinted surfaces
Implementation Method 2
charge-sensitive components
Implementation Method 3
power via inductive coupling
Data Source
AI summary
A device detects infection associated with a prosthetically implanted device, such as a prosthetic knee. The device includes a sensor to detect the presence of one or more proteins secreted by body tissues in response to infection. The sensor may include a surface with a molecular imprint of the protein connected with a potentiometric or amperometric measuring device to detect when the protein bonds with the implanted surface. The device further includes an inductive coil coupled with a corresponding coil located outside the body. Electrical power for operating the measuring device and other circuitry is provided by inductive coupling between the coils. Signals indicating whether the protein is detected are communicated from the device to the external circuitry connected with the external coil.