Real-Time Hip Prosthesis Positioning via Sensor Array
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Solution Overview
Problem
Current hip replacement surgeries lack precise real-time monitoring of the femoral head prosthesis positioning within the acetabulum, leading to potential inaccuracies that can result in reduced service life and increased risk of motion limitations or dislocation due to uneven force distribution.
Innovation Solution
A method and system utilizing pressure sensors, touch sensors, and an image sensor to form a sensor array on the femoral head trial, which wirelessly transmits and displays the relative pose information between the acetabulum and femoral head in real time, allowing surgeons to accurately position the prosthesis during surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional experience-based mounting method is used, then the surgery process is simple and quick, but the positioning precision of femoral head prosthesis in acetabulum cannot be ensured
Solution Approach 1:
The system divides the monitoring function into multiple independent sensor units distributed at different positions on the femoral head trial. Each sensor detects local contact conditions, and the results are aggregated to provide comprehensive positioning information, resolving the contradiction between simple operation and precise measurement.
Solution Approach 2:
The patent introduces an intermediary monitoring system consisting of sensors, signal processing units, and display devices that mediate between the surgical operation and the doctor's decision-making. This intermediary layer provides real-time positioning data without complicating the basic surgical procedure.
2Reliability
If real-time monitoring system is added, then the positioning precision and service life are improved, but the device complexity and cost increase
Solution Approach 1:
The system implements feedback by continuously monitoring contact forces and positions during the mounting process, displaying real-time information to the doctor, and enabling dynamic adjustment of the prosthesis position. This closed-loop feedback ensures reliable positioning while keeping the system manageable through intuitive real-time display.
Solution Approach 2:
The monitoring system is designed to be self-contained with integrated signal processing and wireless transmission capabilities. The sensors automatically detect and transmit data without requiring external complex equipment, reducing overall system complexity while maintaining high reliability.
3Measurement precision
If pressure sensors and image sensors are integrated, then the measurement precision of relative pose is improved, but the device complexity increases
Solution Approach 1:
The patent merges pressure sensors, touch sensors, and image sensors into a single integrated sensor array mounted on the femoral head trial. This consolidation achieves comprehensive relative pose measurement while reducing device complexity by combining multiple sensing functions into one unified system with shared processing and communication infrastructure.
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 enhances the success rate and longevity of hip replacement surgeries by enabling precise positioning and force distribution monitoring, potentially extending the service life of the artificial joint to at least 20 years compared to 7-8 years with traditional methods.
Implementation Method 1
acquiring signals of interactive contacts and forces between the femoral head trial and the acetabulum by the sensor array
Implementation Method 2
disposing an image sensor inside the femoral head trial to acquire position information of the femoral head trial which is then transmitted to the display module. Acquisition of the position information of the femoral head trial is realized by printing previously-designed patterns on the inner side of the acetabulum and taking images of them by the image sensor
Implementation Method 3
transmitting the signals wirelessly; and receiving the signals by a wireless receiver
Data Source
AI summary
A method and system for acquiring the attitudes of an acetabulum and a femoral head in real time during an artificial hip joint replacement procedure; during hip joint replacement, a pressure sensor and/or a touch sensor are disposed at each pressure point concerned for a femoral head prosthesis test mold, forming a sensor array (1); the sensor array (1) acquires the contact and stress conditions between the femoral head prosthesis test mold and the acetabulum, and sends out a signal; and a receiving terminal receives and displays the signal on a display module, and acquires the simulated attitudes of the acetabulum and the femoral head. The system comprises a sensor array (1), a necessary peripheral circuit, and a signal receiving and display device for receiving and displaying the signal sent by the peripheral circuit. The present invention can accurately simulate the presented attitude of the femoral head prosthesis during hip joint replacement procedure, so that a doctor can intuitively see the position and movement condition of the femoral head prosthesis during the procedure, thus improving the success rate and curative effect of the hip joint replacement procedure.