Rehabilitation Sensor Calibration for Joint Surgery Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current rehabilitation monitoring systems for joint surgery patients lack a convenient, integrated solution for measuring joint flexion, body position, and temperature, often requiring separate sensors and failing to provide timely feedback and encouragement, leading to potential non-compliance with rehabilitation regimens.
Innovation Solution
A sensor apparatus with two temperature sensors to account for environmental variations, wireless data storage and transmission, and a method for easy attachment and calibration, incorporating motion and temperature sensors to track patient progress and provide feedback on compliance with rehabilitation goals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single temperature sensor is used near the wound site, then temperature measurement is simple, but environmental variations cause misleading data
Solution Approach 1:
The temperature monitoring function is segmented into two separate sensors: one placed near the wound site to detect local temperature changes, and another placed on the opposite thigh to detect environmental temperature variations. This segmentation allows the system to distinguish between local physiological changes and environmental effects, resolving the contradiction between simple device design and measurement accuracy.
Solution Approach 2:
Different parts of the system are given different functional qualities: the first temperature sensor is optimized for detecting local wound site temperature, while the second temperature sensor is optimized for detecting environmental temperature. This local quality differentiation enables accurate temperature monitoring despite environmental variations.
2Measurement precision
If separate sensors are used for each measurement parameter, then measurement accuracy is maintained, but device complexity and ease of operation deteriorate
Solution Approach 1:
Multiple sensors (two temperature sensors, motion sensor, accelerometer) are merged into a single integrated sensor apparatus that is attached to the patient's thigh as one unit. This merging maintains the precision of individual sensors while simplifying the overall device structure and ease of operation, as the entire sensor system can be applied and removed as a single component.
Solution Approach 2:
The sensor apparatus is designed with multi-functionality, serving as a universal monitoring device that simultaneously measures temperature, motion, and body position. This universal design eliminates the need for multiple separate sensor systems, reducing device complexity while maintaining comprehensive measurement capabilities.
3Reliability
If comprehensive sensor monitoring is implemented, then patient compliance feedback is improved, but device complexity increases
Solution Approach 1:
Multiple sensing functions (temperature sensing, motion detection, acceleration measurement) are combined into a single integrated sensor apparatus with a unified data processing system. This merging provides comprehensive rehabilitation compliance monitoring through one device, improving reliability while managing complexity through integration rather than proliferation of separate systems.
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 solution provides accurate, continuous monitoring of patient progress, eliminating environmental temperature interference and enabling remote data transmission, thus enhancing patient compliance and caregiver management through timely feedback and goal-based encouragement.
Implementation Method 1
The temperature near the wound site can provide measure of how often and for how long the patient applies ice to their joint
Implementation Method 2
Body position can be determined by attaching an accelerometer to the patient's thigh and/or shin to detect the direction of gravitational acceleration
Implementation Method 3
Several published papers show the use of integrated circuit accelerometers or capacitive, resistive or inductive flex sensors to detect joint movements and range of motion
Data Source
AI summary
A method for calibrating sensors applied to a patient to monitor rehabilitation is disclosed. The calibration method according to the invention that is insensitive to changes in the patient's body position during the calibration procedure—calibration of the flex sensors is facilitated regardless of what orientation they may be applied to the thigh and shank of patient. The calibration method uses three-axis accelerometers defined by software incorporated in local computer.