Non-invasive Joint Assessment via Acoustic and Electrical Interrogation
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Solution Overview
Problem
Current methods for diagnosing prosthetic joint infections (PJIs) after joint replacement surgery are invasive, costly, and resource-intensive, often requiring clinical evaluations, blood tests, and synovial fluid aspiration, which can lead to complications and delayed recovery.
Innovation Solution
A non-invasive system and method using a measurement device that applies mechanical or acoustic energy to assess joint conditions, employing machine learning or statistical analysis to determine effusion states, implant integrity, and other joint pathologies, allowing for a reliable, inexpensive, and objective assessment of joint health.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synovial fluid aspiration is performed for PJI diagnosis, then diagnostic accuracy is improved, but patient trauma and recovery time increase
Solution Approach 1:
The patent replaces the mechanical invasion of synovial fluid aspiration with acoustic wave-based measurement. The system uses acoustic transducers to generate and detect acoustic waves that interact with the joint tissue, providing diagnostic information without mechanical penetration or fluid extraction, thereby eliminating the associated trauma and infection risks.
Solution Approach 2:
The patent introduces acoustic waves as an intermediary medium to transmit diagnostic information from the joint tissue to the sensors. Instead of directly extracting synovial fluid, the acoustic waves act as a mediator that carries information about the joint's mechanical and acoustic properties, enabling indirect but non-invasive diagnosis.
2Measurement precision
If ultrasound imaging is used for joint assessment, then diagnostic capability is improved, but cost and resource requirements increase
Solution Approach 1:
The patent employs inexpensive acoustic transducers and sensors that can be used for diagnostic purposes without requiring the complex infrastructure of ultrasound machines. These simpler devices provide sufficient diagnostic capability for detecting effusion and tissue changes while being more cost-effective and easier to deploy in resource-limited settings.
Solution Approach 2:
The patent extracts only the essential diagnostic function from complex imaging systems. Instead of using full ultrasound imaging equipment, the system isolates and utilizes acoustic wave transmission and detection capabilities, removing unnecessary complexity while retaining the core ability to detect joint abnormalities through acoustic properties.
3Measurement precision
If blood tests are performed for PJI diagnosis, then infection detection is improved, but diagnostic timing is delayed
Solution Approach 1:
The patent performs preliminary assessment of joint conditions through acoustic measurements that can detect early signs of effusion and tissue changes before infection fully develops or before blood biomarkers become elevated. This allows for earlier intervention and monitoring compared to waiting for blood test results.
Solution Approach 2:
The patent replaces blood-based chemical analysis with acoustic-based mechanical property measurement. By assessing the mechanical and acoustic properties of joint tissue and fluid, the system can detect infection-related changes locally and immediately, bypassing the time required for blood circulation, processing, and laboratory analysis.
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 detection of PJIs and other joint conditions with reduced trauma and cost, providing a quick and convenient means to direct further diagnosis or treatment, such as aspiration, improving patient recovery and reducing healthcare expenses.
Implementation Method 1
The measurement device may actively interrogate the bone connected to the joint and nearby tissue with mechanical or acoustic energy by applying an impulse or vibratory mechanical or acoustic energy into the bone to assess the response of the bone at its connecting joint and its proximate tissue.
Implementation Method 2
The measurement device may actively interrogate the bone connected to the joint and nearby tissue with mechanical or acoustic energy by applying an impulse or vibratory mechanical or acoustic energy into the bone to assess the response of the bone at its connecting joint and its proximate tissue.
Implementation Method 3
The measurement device may additionally interrogate the bone connected to the joint and nearby tissue with electrical energy by applying an impulse or vibratory electrical energy into the joint (e.g., knee) or its nearby tissue to assess the electrical response of the joint and its proximate tissue.
Data Source
AI summary
An exemplary system and method that non-invasively assess the effusion state of a joint via the use of a non-invasive measurement device. The measurement device actively interrogates the bone connected to the joint and nearby tissue with mechanical or acoustic energy by applying an impulse or vibratory mechanical or acoustic energy into the bone to assess the response of the bone at its connecting joint and its proximate tissue. The measurement device may additionally interrogate the bone connected to the joint and nearby tissue with electrical energy by applying an impulse or vibratory electrical energy into the joint (e.g., knee) or its nearby tissue to assess the electrical response of the joint and its proximate tissue. In some embodiments, the sensors employ both mechanical interrogation and electrical interrogation of the joint for the non-invasive assessment, e.g., for bioimpedance characteristics of the tissue and joint.