Optokinetic Research Paper

992 Words 4 Pages
Optokinetic and electromagnetic systems are widely used in laboratory settings to monitor three -dimensional (3-D) motion. These systems are accurate, but they have certain limitations like high cost, more space requirements and set–up issues. These limitations make them impractical for use at home[2].Miniature movement sensor modules[10] use accelerometers, rate gyroscopes and magnetometers to estimate 3-D orientation. These devices are more complicated and delicate to use at home by a patient[10].
Marras et al. developed an instrumented exoskeleton which monitors 3D motion of the lumbar spine at different lumbar levels. However the device is use when the person is standing position only
Digital inclinometers are comparatively cheap and monitored
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However use of this device requires a trained operator. Calibration also needs to be done before using the device. Flexible electrogoniometers are strain-gage-based systems that consists of two light-weight end blocks fixed to the twelfth thoracic vertebrae(T12) and sacral spine(S2)spinal processes. They are separated by a steel spring and it protects a narrow strip of steel foil[11]. Strain gages attached to the foil were used to monitor lumbar angle motion in two different planes during both prone and supine postures. Strain gages used to monitor lumbar movement are attached to the surface of the foil. However, the system is expensive to develop. The device implemented in this paper consists of load cell mounted at the end of stainless–steel strip to measure sagittal flexion.
Lateral bending is measured using an accelerometer which placed at the twelfth thoracic vertebrae. The system designed and implemented is wearable system for the monitoring of lumbar bending. It is light weight and inexpensive device. The output of load cell and accelerometer were analysed and signal conditioning was done accordingly.
Also linearity of load cell checked for different weights. The system could be worn comfortably during lumbar exercises
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Similarly, Test 2 is used for threshold determination when the patient is made to bend towards the right after carrying out Test 1. Test 2 is followed by another test, Test 3 which determines the threshold during frontal bending of the patients spine which normally measures the stress produced when the lower back is bent. After setting thresholds by the clinician, the device is ready to use by patient without the supervision of the clinician. So now system works in patient mode .As the threshold exceeds, buzzer will be turned On. The threshold setting can be access by the clinician only using a password so the patient can’t make any changes in the calibration. The system designed and implemented is wearable system for the monitoring of lumbar bending. It is light weight and inexpensive device. The output of load cell and accelerometer were analysed and signal conditioning was done accordingly.
Also linearity of load cell checked for different weights. The system could be worn comfortably during lumbar exercises for accurate monitoring. The device can be used by the patient at home without the supervision of the clinician. Also data can be saved and used by the clinician for

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