Torso-Mounted Triaxial Accelerometer for Running Asymmetry Detection
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Solution Overview
Problem
Existing devices and methods for measuring biomechanical efficiency of a runner's stride are complex, costly, and inaccurate, failing to provide real-time, portable, and self-sufficient analysis of parameters linked to the runner's center of gravity, and do not effectively detect asymmetries that can lead to injury or fatigue.
Innovation Solution
A portable device with a triaxial accelerometer fastened to the runner's torso, near the center of gravity, measures acceleration data in multiple directions to calculate biomechanical parameters, including asymmetries, and displays them in real-time for improved training and injury prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a triaxial accelerometer is fastened to the runner's torso near the center of gravity, then measurement precision of biomechanical parameters is improved, but device complexity increases
Solution Approach 1:
The device is segmented into three independent accelerometer axes (X, Y, Z) that can be processed separately, allowing complex biomechanical analysis through simple linear acceleration measurements in each direction
Solution Approach 2:
The triaxial accelerometer serves multiple functions: measuring vertical acceleration, horizontal acceleration, and detecting asymmetries between left and right movements, all from a single device placed on the torso
2Measurement precision
If force sensors are used in treadmills to measure reaction force with high accuracy, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical force sensors with a simple triaxial accelerometer that measures acceleration forces, eliminating the need for expensive treadmills and force measurement systems while providing equivalent or superior data
3Measurement precision
If accelerometers are placed on the shoe to track foot trajectory, then measurement precision of foot movement is improved, but reliability of stride analysis decreases
Solution Approach 1:
Instead of placing the sensor on the foot to directly measure foot trajectory, the patent inverts the approach by placing the sensor on the torso near the center of gravity, where it can reliably measure body movement and infer stride characteristics through acceleration patterns
4Ease of operation
If wristwatches with inertial sensors are used to evaluate distance and calories, then ease of operation is improved, but measurement precision of stride analysis decreases
Solution Approach 1:
The patent applies local quality by placing the accelerometer specifically on the torso near the center of gravity, where the sensor captures the most relevant biomechanical data for stride analysis, rather than using a generic wrist-mounted sensor
5Measurement precision
If multiple sensors are distributed on the athlete's body to analyze movement trajectory, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple sensors into a single triaxial accelerometer placed on the torso, combining all necessary measurement capabilities (vertical acceleration, horizontal acceleration, asymmetry detection) in one device rather than distributing sensors throughout the body
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 device provides accurate, real-time analysis of biomechanical parameters, enabling immediate detection of asymmetries and fatigue risks, facilitating personalized training plans and equipment recommendations for enhanced running efficiency and safety.
Implementation Method 1
measuring a sequence of acceleration data in at least the vertical direction using the accelerometer
Data Source
AI summary
A method and system for preventing injuries to a runner by analyzing biomechanical asymmetries during a running activity. A wearable device comprising an accelerometer and a digital processor is fastened to the runner to measure acceleration data, including in the vertical, lateral, and anteroposterior directions, over the course of a defined distance. Based on the acceleration data and the motion of the runner's center of gravity, the device calculates an asymmetry of movement, which may reflect differences between limb movements or directional displacements. The calculated asymmetry is displayed on the device, optionally in formats such as radar charts or Kiviat diagrams, and is used to assess performance indicators including balance, mobility, and fatigue. The method further includes classifying runners into different types—e.g., pronators or supinators—and selecting appropriate sport equipment, such as shoes, that enhance running efficiency or protect the musculotendinous system.