Design and Calibration of Pinch Force Measurement Using Strain Gauge for Post-Stroke Patients

  • Abdallah Alsayed Universiti Putra Malaysia
  • Raja Kamil Universiti Putra Malaysia
  • Hafiz Rashidi Ramli Universiti Putra Malaysia
  • Azizan As’arry Universiti Putra Malaysia

Abstract

Two fingers strength is an indicative measurement of pinch impairment. Conventionally, Fugl Meyer Upper Extremity Assessment (FMA-UE) is the primary standard to measure pinch strength of post-stroke survivors. In literature, the evaluation method performed by the therapist is subjective and exposed to inter-rater and intra-rater reliabilities. Recently, force-sensing resistors were implemented to measure two fingers force, but these sensors are subjected to nonlinearity, high hysteresis, and voltage drift. This paper presents a design of pinch force measurement based on the strain gauge. The pinch sensor was calibrated within a range of between 0 N to 50 N over a pinching length of 20 mm with a linearity error of 0.0123% and hysteresis of 0.513% during the loading and unloading process. The voltage drift has an average of 0.24% over 20 minutes. The pinch force measurement system reveals an objective pinch force measurements in evaluating the rehabilitation progress of post-stroke patients.

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Published
05-09-2019
How to Cite
Alsayed, A., Kamil, R., Ramli, H. R., & As’arry, A. (2019). Design and Calibration of Pinch Force Measurement Using Strain Gauge for Post-Stroke Patients. International Journal of Integrated Engineering, 11(4). Retrieved from https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/4557