Magnetic Sensor Hip Prosthesis Alignment
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Solution Overview
Problem
Current methods for aligning hip replacement prostheses during hip arthroplasty procedures are inaccurate and prone to postoperative hip dislocation due to non-optimal implant orientation, lack of digital guidance, and inability to detect bony impingement, leading to costly revision surgeries and patient dissatisfaction.
Innovation Solution
A system utilizing a spatially distributed array of multi-axis magnetometers embedded in the acetabular liner component to measure the orientation of the femoral head and detect full contact, combined with a high-resolution microscopic optical color detector system in the femoral head component to map the movement of the contact point, providing real-time high-precision data for optimal implant alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional manual alignment methods are used during hip arthroplasty, then the surgical procedure is simple and quick, but the implant orientation accuracy is poor leading to high dislocation rates
Solution Approach 1:
The patent replaces manual mechanical alignment methods with a magnetic field-based measurement system. Magnetometers embedded in the acetabular liner component detect the orientation of the femoral head component through magnetic field interactions, eliminating the need for complex mechanical alignment tools and manual measurement techniques.
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the femoral head component and the acetabular liner component. The magnetometers use magnetic field interactions to indirectly measure the orientation and contact status without requiring direct physical contact or complex mechanical linkages between components.
2Measurement precision
If traditional alignment methods without digital guidance are used, then the device complexity is low, but the detection precision of contact point and orientation is insufficient
Solution Approach 1:
The patent replaces visual and tactile detection methods with optical and magnetic detection systems. The optical color detector captures precise contact point information, while magnetometers detect orientation data, providing digital guidance that far exceeds the precision of traditional manual assessment.
Solution Approach 2:
The patent creates digital copies of the physical contact and orientation states through optical imaging and magnetic field measurements. The optical color detector generates a digital map of the contact point, and magnetometers create a digital representation of the implant orientation, allowing for precise analysis and guidance.
3Reliability
If traditional trial components without contact detection are used, then the device complexity is low, but the reliability of stability testing is poor due to inability to detect full contact
Solution Approach 1:
The patent uses magnetic fields as an intermediary to detect whether the femoral head is in full contact with the acetabular liner. The magnetometers measure magnetic field interactions that change based on contact status, providing reliable objective data about joint stability without requiring visual inspection or manual assessment.
Solution Approach 2:
The patent implements a feedback mechanism where the magnetometers continuously monitor the contact status and orientation during stability testing. This real-time feedback allows the surgeon to adjust the implant positioning to achieve optimal contact and stability before final implantation.
4Measurement precision
If manual stability testing without objective measurement is performed, then the procedure is simple, but the measurement precision of orientation and contact is insufficient leading to revision surgeries
Solution Approach 1:
The patent replaces subjective manual assessment of orientation and contact with objective magnetic field-based measurements. The magnetometers provide precise quantitative data about the implant orientation and contact status, eliminating the variability and imprecision of manual evaluation.
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
The system significantly reduces the risk of postoperative hip dislocation by ensuring accurate alignment and contact detection, reducing revision surgeries and associated costs, and enhancing patient outcomes through precise alignment and reduced risk of impingement.
Implementation Method 1
a spatially distributed array of magnetometers embedded in the acetabular liner component to measure the orientation of the femoral head
Implementation Method 2
a high-resolution microscopic optical color detector system in the femoral head component to map the movement of the contact point
Data Source
AI summary
In one aspect, a system and method for aligning hip replacement prostheses comprises an acetabular liner having an inner concave surface and an outer convex surface. The acetabular liner includes at least two magnetic sensors arranged in a spatially distributed manner. The system and method also include a prosthetic femoral component comprising a femoral head component. The femoral head component and the acetabular liner component are shaped such that a ball and socket joint is formed when the femoral head component comes into contact with the inner concave surface of the acetabular liner. While the ball-and-socket joint is formed, and in at least some orientations of the femoral head component relative to the acetabular liner component, a contact point on an external surface of the femoral head component contacts the inner concave surface. The femoral head component includes at least one permanent magnet.