Hip Prosthesis Sensor Integration for Continuous Monitoring
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Solution Overview
Problem
Current hip replacement monitoring methods are limited by the inability to accurately measure and follow real-time, continuous, objective prosthesis performance and patient activity levels outside of clinical visits, leading to difficulties in detecting complications and evaluating rehabilitation progress.
Innovation Solution
The integration of sensors into hip prostheses to monitor their integrity and performance, including accelerometers, contact sensors, strain gauges, and others, which can be wirelessly powered and data-transmitted, allowing for continuous, in-situ monitoring of patient activity and prosthesis performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are integrated into hip prostheses for continuous monitoring, then measurement precision and reliability of prosthesis performance data are improved, but device complexity increases
Solution Approach 1:
The patent combines multiple sensor types (accelerometers, contact sensors, strain gauges) and power generation structures into a single integrated prosthesis unit. This merging approach enables comprehensive continuous monitoring of prosthesis performance and patient activity while managing device complexity through unified integration rather than separate components.
Solution Approach 2:
The prosthesis is designed with multi-functional capabilities, serving both as a mechanical replacement for the hip joint and as a monitoring platform. The same structural elements of the prosthesis housing also serve as mounting structures for sensors and power generation components, allowing the device to perform mechanical support and data collection functions simultaneously.
2Loss of information
If wireless sensors are used for continuous monitoring, then loss of information is reduced, but use of energy increases
Solution Approach 1:
The monitoring system employs periodic data transmission rather than continuous transmission. Sensors collect data continuously, but wireless transmission occurs at scheduled intervals or when significant changes are detected. This periodic action reduces energy consumption from wireless communication while maintaining comprehensive monitoring capabilities.
Solution Approach 2:
The prosthesis incorporates self-powered sensor operation through integrated power generation structures that harvest energy from patient movement. The piezoelectric or electromagnetic power generation elements convert mechanical energy from normal hip motion into electrical energy, enabling sensors to power themselves without external battery replacement or charging.
3Reliability
If multiple sensor types are integrated into the prosthesis, then reliability of complication detection is improved, but ease of manufacture decreases
Solution Approach 1:
The prosthesis is divided into modular segments that can be manufactured separately and assembled. Different sensor types are integrated into distinct modules (e.g., accelerometers in one module, strain gauges in another), allowing each module to be manufactured using optimized processes and then assembled into the complete prosthesis. This segmentation improves reliability through specialized manufacturing while maintaining ease of assembly.
Solution Approach 2:
Sensors and power generation structures are nested within the existing prosthesis components rather than adding external attachments. The monitoring elements are embedded within the structural elements of the prosthesis, with sensors housed within the femoral stem or acetabular cup. This nesting approach integrates multiple functions without significantly increasing the external dimensions or assembly complexity of the overall device.
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 solution enables live, continuous monitoring of hip replacement performance and patient activity, providing valuable, objective data that enhances patient care and rehabilitation outcomes by allowing for early detection of complications and improved management of hip replacement patients.
Implementation Method 1
The sensors may be positioned on the outer surface of the prosthetic hip, on the inner surfaces of the prosthetic hip, within the prosthetic material (stainless steel, titanium, cobalt chromium, polyurethane, high molecular weight polyurethane, ceramics, etc.) itself
Implementation Method 2
a sensor positioned on, in, or around the prosthesis
Implementation Method 3
there may be wear between the femoral head and the acetabular liner, which leads to improper operation of the artificial hip joint
Data Source
AI summary
Hip replacement prosthesis are provided, comprising a femoral stem, a femoral head coupled to the femoral stem, and an acetabular assembly coupled to the femoral head, and a plurality of sensors coupled to at least of the femoral stem, femoral head, and acetabular assembly.