Capacitive Sensor Array for Joint Load Measurement
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Solution Overview
Problem
Current orthopedic joint replacement procedures face challenges in accommodating individual patient variations due to the lack of precise measurement tools for real-time alignment, load distribution, and impingement detection during surgery, relying heavily on surgeon skill and subjective feedback.
Innovation Solution
A kinetic measurement system with a sensor array and printed circuit board configuration that includes compressible capacitors and a hermetically sealed housing, allowing for real-time measurement of force, pressure, and alignment within the musculoskeletal system, providing quantitative data for optimal joint alignment and adjustment during orthopedic surgeries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional orthopedic joint replacement procedures are used without real-time measurement tools, then the surgical procedure can be performed with basic tools and standardized protocols, but the ability to accommodate individual patient variations and achieve precise alignment is limited
Solution Approach 1:
The measurement device is divided into multiple independent sensor elements distributed across the articular surface, with each sensor measuring local load and position independently. This segmentation allows complex measurement functions to be achieved through simple, modular components that can be individually positioned and calibrated.
Solution Approach 2:
The patent replaces subjective mechanical assessment and surgeon skill-based alignment with objective electronic sensing. Capacitive sensors electronically measure load distribution, position, and alignment parameters, substituting the mechanical judgment process with quantitative electronic data collection and processing.
2Reliability
If surgeon skill and subjective feedback are relied upon for joint replacement, then the procedure can be performed with available tools, but the consistency and reliability of individualized treatment is reduced
Solution Approach 1:
The device provides real-time feedback to the surgeon during the procedure through electronic sensors that continuously monitor load distribution, position, and alignment. This feedback loop enables dynamic adjustment of the implant positioning to achieve optimal alignment, improving treatment consistency and reliability.
Solution Approach 2:
The measurement device is designed to be self-calibrating and self-monitoring, with sensors that automatically detect and report alignment parameters without requiring external calibration tools or subjective assessment. The system serves itself by providing objective, quantifiable data that guides the surgical procedure.
3Measurement precision
If a sensor array with multiple sensors is implemented, then real-time measurement of force, pressure, and alignment is enabled, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Multiple sensor elements are merged into a single integrated array structure that can be manufactured as one component. The sensor array is combined with the articular surface geometry, allowing simultaneous measurement of multiple parameters across the entire joint surface through a single fabrication process rather than assembling individual sensors.
Solution Approach 2:
The sensor array is designed to perform multiple measurement functions simultaneously - measuring load, pressure, position, and alignment - through a single integrated structure. This multi-functionality reduces manufacturing complexity by eliminating the need for separate measurement systems for each parameter.
4Adaptability or versatility
If standardized joint replacement tools and procedures are used, then they can meet the general needs of a wide population, but they cannot accommodate individual patient variations
Solution Approach 1:
The device collects and stores individual patient-specific measurement data during the surgical procedure, creating a database of patient-specific alignment and load characteristics. This preliminary data collection enables post-operative analysis and planning for future procedures, capturing individual variations before they affect implant performance.
Solution Approach 2:
The measurement system adds a quantitative data dimension to the surgical process, transforming subjective surgical outcomes into objective, measurable parameters. By introducing electronic sensing and digital data collection, the system captures individual patient variations in alignment, load distribution, and joint mechanics that were previously unmeasurable.
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 precise real-time data collection and feedback for surgeons, improving the accuracy of orthopedic joint replacements by quantifying load distribution and alignment, reducing revision rates and extending the lifespan of implants.
Implementation Method 1
A kinetic measurement system with a sensor array and printed circuit board configuration that includes compressible capacitors
Data Source
AI summary
A measurement device is disclosed that includes a first component having an outer surface having one or more flexible articular surfaces, and an inner surface having a first area having protrusions defining a polygon with a plurality of vertices. A load plate can be in contact with the first area. A printed circuit board can have a central section and a first lateral section. The first lateral section can have a sensor array having a plurality of sensors. Each sensor can be positioned in alignment with a vertex of the polygon and having a load pad in contact with a lower surface of the rigid load plate. A reference sensor can be spaced from the lower surface of the load plate.