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Bioengineering 2016, 3(3), 18; doi:10.3390/bioengineering3030018

Tremor Reduction at the Palm of a Parkinson’s Patient Using Dynamic Vibration Absorber

Department of Mechanical Engineering, Lebanese International University, Beirut, Lebanon
Department of Biomedical Engineering, Lebanese International University, Beirut, Lebanon
Author to whom correspondence should be addressed.
Academic Editor: Gou-Jen Wan
Received: 20 March 2016 / Revised: 17 May 2016 / Accepted: 30 June 2016 / Published: 5 July 2016
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Parkinson’s patients suffer from severe tremor due to an abnormality in their central oscillator. Medications used to decrease involuntary antagonistic muscles contraction can threaten their life. However, mechanical vibration absorbers can be used as an alternative treatment. The objective of this study is to provide a dynamic modeling of the human hand that describes the biodynamic response of Parkinson’s patients and to design an effective tuned vibration absorber able to suppress their pathological tremor. The hand is modeled as a three degrees-of-freedom (DOF) system describing the flexion motion at the proximal joints on the horizontal plane. Resting tremor is modeled as dual harmonic excitation due to shoulder and elbow muscle activation operating at resonance frequencies. The performance of the single dynamic vibration absorber (DVA) is studied when attached to the forearm and compared with the dual DVA tuned at both excitation frequencies. Equations of motion are derived and solved using the complex transfer function of the non-Lagrangian system. The absorber’s systems are designed as a stainless steel alloy cantilevered beam with an attached copper mass. The dual DVA was the most efficient absorber which reduces 98.3%–99.5%, 97.0%–97.3% and 97.4%–97.5% of the Parkinson’s tremor amplitude at the shoulder, elbow and wrist joint. View Full-Text
Keywords: Parkinson’s disease; involuntary tremor; tuned vibration absorber; dynamically coupled system Parkinson’s disease; involuntary tremor; tuned vibration absorber; dynamically coupled system

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Gebai, S.; Hammoud, M.; Hallal, A.; Khachfe, H. Tremor Reduction at the Palm of a Parkinson’s Patient Using Dynamic Vibration Absorber. Bioengineering 2016, 3, 18.

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