Wireless and retrofittable in-shoe system for real-time estimation of kinematic and kinetic gait parameters
AssigneesThe Trustees of the Stevens Institute of Technology, The Trustees of Columbia University in the City of New York
InventorsDamiano Zanotto, Sunil K. Agrawal, Huanghe Zhang
Life of this patent
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Abstract
A quantitative gait training and/or analysis system includes one or more footwear modules that may include a piezoresistive sensor, an inertial sensor and an independent logic unit. The footwear module functions to permit the extraction of gait kinematics and evaluation thereof in real time, or data may be stored for later reduction and analysis. Embodiments relating to calibration-based estimation of kinematic gait parameters are described.
Claims33
A method for calibrating a gait measurement system, comprising the steps of:
- i) providing an instrumented insole having a plurality of pressure-sensing cells;
- ii) exerting a fixed, uniform pressure on said instrumented insole;
- iii) recording a respective output for each of said pressure-sensing cells in response to pressure exerted on said instrumented insole during the performance of step (ii);
- iv) applying a plurality of fitting functions to said respective output of each of said pressure-sensing cells, thereby obtaining a plurality of respective model data;
- and
- v) applying cross validation to said plurality of respective model data to obtain a calibration model for each of said pressure-sensing cells.
A method for calibrating a gait measurement system, comprising the steps of:
- i) providing an instrumented insole and a reference source;
- ii) recording a first data set from said instrumented insole and a second data set from said reference source;
- iii) computing center of pressure trajectories from said first data set and said second data set;
- iv) validating said center of pressure trajectories using one or more regression models;
- and
- v) calibrating said instrumented insole via said first data set and said second data set.
Dependencies are inferred from the claim text.