Designing an optical bendloss sensor for clinical force measurement

David R. Linders; Wei-Chih Wang; David J. Nuckley

doi:10.1117/12.816542

8 April 2009 Designing an optical bendloss sensor for clinical force measurement

David R. Linders, Wei-Chih Wang, David J. Nuckley

Proceedings Volume 7295, Health Monitoring of Structural and Biological Systems 2009; 72951O (2009) https://doi.org/10.1117/12.816542
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

Abstract

In current physical medicine, specific manual forces are applied to patients for diagnosis, treatment, and evaluation, but these forces remain largely qualitiative. No universal tool exists to measure these forces and display them in real-time. To provide real-time quantitative feedback to clinicians, we have developed a disposable glove with a force sensor embedded in the fingertips or palm. The sensor is based on the fiberoptic bendloss effect whereby light intensity from an infrared source is attenuated as the fiber is bent between a series of corrugated teeth. The sensor fabricated has a very low profile (10 × 7 × 1 mm) and has demonstrated high sensitivity, accuracy, range, and durability. Forces as low as 0.1 N and up to 90 N have been measured with high signal to noise ratios. Good agreement with theoretical predictions of bendloss has been demonstrated. Current trials have obtained data from 20 ACL reconstruction patients demonstrating a significant increase in range of motion recovery for patients who consistently stretch at home over those who do not.

Citation Download Citation

David R. Linders, Wei-Chih Wang, and David J. Nuckley "Designing an optical bendloss sensor for clinical force measurement", Proc. SPIE 7295, Health Monitoring of Structural and Biological Systems 2009, 72951O (8 April 2009); https://doi.org/10.1117/12.816542

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KEYWORDS

Sensors

Calibration

Light emitting diodes

Signal to noise ratio

Teeth

Fiber optics sensors

Phototransistors

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