Knee Insert Sensing Module for Load Measurement
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Solution Overview
Problem
Current joint replacement surgeries lack precise methods for measuring physical parameters such as load, force, and pressure during surgery, relying on subjective surgeon feedback, which can lead to suboptimal implantation and long-term joint performance issues.
Innovation Solution
A wireless sensing module with integrated sensors, a power source, and electronic circuitry is used to measure and transmit real-time data on load and position, aiding surgeons in optimizing joint loading and balance during surgery and providing long-term monitoring of joint status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional joint replacement surgery is performed without sensing devices, then the surgical procedure is simple and quick, but the measurement precision of load and force parameters is insufficient
Solution Approach 1:
The sensing module is integrated within the trial insert structure, with sensors nested inside the insert body. The electronic circuitry, power source, and communication components are housed within the same component that serves as the joint trial device, eliminating the need for separate measurement equipment and reducing overall system complexity while maintaining high measurement precision
Solution Approach 2:
The patent combines multiple functions into a single integrated sensing module: the trial insert serves both as the joint replacement trial component and as the housing for the sensing system. The sensing assemblages, electronic circuitry, power source, and communication transceiver are merged into one unified device that can be implanted and removed as a single unit
2Measurement precision
If a sensing module is integrated into the trial insert, then the measurement precision improves, but the manufacturing complexity increases
Solution Approach 1:
The trial insert is designed to serve multiple purposes: it functions as the joint replacement trial component, the housing for the sensing system, the mounting structure for sensors, and the interface for load measurement. This multi-functionality reduces the need for separate manufacturing processes and assembly steps, thereby improving ease of manufacture despite the enhanced measurement capabilities
3Measurement precision
If multiple sensing assemblages are used to measure load and position, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The sensing system is divided into multiple sensing assemblages, each responsible for measuring specific parameters such as load magnitude, load position, and joint angle. Each assemblage contains dedicated sensors positioned at specific locations within the trial insert, allowing for precise measurement of different parameters while keeping each sensing unit relatively simple and modular
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 precise adjustments during surgery, improving the fit and longevity of joint implants by providing quantitative data on load distribution and balance, reducing wear and misalignment, and extending the life of the implant.
Implementation Method 1
The sensor is a piezoresistive sensor positioned at a predetermined location
Data Source
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AI summary
An insert (100) is disclosed for measuring a parameter of the muscular- skeletal system. The insert (100) can be temporary or permanent. In one embodiment, the insert (100) is prosthetic component for a single compartment of the knee. The insert (100) comprises a support structure (102) and a support structure (104) respectively having an articular surface (106) and a load bearing surface (108). The height of the insert (100) is less than 10 millimeters. At least one internal cavity (606) is formed when support structures (102, 104) are coupled together for housing electronic circuitry (618), sensors (602), and the power source (616). The cavity (606) can be sterilized through a port (612). A membrane (614) is between the port (612) and the cavity (606). A sterilization gas permeates the membrane (614) for sterilizing cavity (606). The membrane (614) prevents ingress of solids and liquids to the cavity (606).