Stress-Sensitive ECT Tomography for Prosthetic Monitoring
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Solution Overview
Problem
Current imaging techniques for monitoring prosthetic joint infections are invasive, costly, and often rely on harmful radiation or contrast agents, lacking effective non-contact, non-invasive methods for real-time monitoring of changes in prosthetic integration and stress distribution.
Innovation Solution
The use of stress-sensitive materials applied to objects of interest within electrical capacitance tomography (ECT) systems, allowing for non-contact, non-invasive monitoring through changes in dielectric properties, enabling the generation of maps that indicate successful incorporation or changes in the region of interest over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If MRI or CT imaging techniques are used to monitor prosthetic joint infections, then detailed internal images can be obtained, but harmful radiation exposure or injection of harsh contrast agents is required
Solution Approach 1:
The patent replaces harmful mechanical/chemical imaging methods (CT radiation, MRI contrast agents) with an electrical field-based ECT system. The ECT device uses alternating current signals applied to boundary electrodes to create electrical fields that penetrate tissue without ionizing radiation, measuring capacitance changes to reconstruct permittivity distributions that indicate infection or loosening.
Solution Approach 2:
The patent introduces stress-sensitive materials as intermediary elements applied to the prosthetic surface. These materials change their dielectric properties in response to stress, strain, or chemical environment changes (such as pH changes from infection), translating mechanical or chemical states into detectable electrical permittivity changes that the ECT system can measure non-invasively.
2Reliability
If radionuclide imaging or PET scanning is used to monitor prosthetic joint infections, then infection detection is possible, but the procedures are time-consuming, labor-intensive, and costly
Solution Approach 1:
The patent replaces complex nuclear medicine procedures (radionuclide imaging, PET scanning) with a simpler electrical measurement system. The ECT device performs rapid capacitance measurements through boundary electrodes, reconstructing images in real-time or near-real-time without requiring radioactive tracers, complex patient preparation, or lengthy acquisition periods.
Solution Approach 2:
The stress-sensitive materials applied to the prosthetic provide self-indicating properties by changing their dielectric characteristics in response to local environmental changes (pH, stress, strain). This eliminates the need for external contrast agents or radioactive tracers, as the prosthetic itself becomes the sensor through its coating materials.
3Ease of operation
If conventional ECT is used to image permittivity distribution, then non-contact monitoring is achieved, but stress-sensitive material application is required to enhance detection capability
Solution Approach 1:
The patent uses thin film coatings of stress-sensitive materials applied to the prosthetic surface. These flexible films conform to the prosthetic geometry and maintain electrical isolation while providing stress-dependent dielectric property changes. The thin film structure allows easy application through coating processes and maintains the non-contact nature of the ECT measurement.
Solution Approach 2:
The patent employs composite stress-sensitive materials that combine multiple functional properties (piezoelectric, piezoresistive, dielectric) within a single coating layer or multi-layer structure. These composite materials respond to mechanical stress, strain, or chemical environment changes by altering their electrical permittivity, providing enhanced detection capability while maintaining a relatively simple application process.
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 cost-effective, non-invasive method for monitoring prosthetic integration and detecting potential issues such as infection or loosening without dismantling the object, reducing investigation time and costs by generating detailed maps of changes in the region of interest.
Implementation Method 1
The stress-sensitive material may change in a dielectric property as a function of stress
Data Source
AI summary
Systems and methods for monitoring a change to a region of interest over time are disclosed. Exemplary embodiments may: (a) apply one or more layers of a stress-sensitive material to an object of interest; (b) incorporate the object of interest into a region of interest; (c) insert the region of interest with stress-sensitive material into an electrical capacitance tomography (ECT) device to interrogate the region of interest; (d) generate a first map of the region of interest based on captured information from the ECT device; (e) after a first length of time, repeat steps (c)-(d) to generate a second map of the region of interest; and (f) compare the first map to the second map to determine changes to the region of interest based on changes to the stress-sensitive material.