Yasser Ayeva

Date of Award

5-1-2024

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Electrical Engineering

First Advisor

Ryan Striker

Abstract

Paralyzed patients due to spinal cord injuries or other injuries can produce functional movements with the help of functional electrical stimulation (FES). Electrical discharges are applied to the patient's muscles to help with specific movements like walking, standing, and holding and grasping objects (Cleveland Clinic,2023). FES is not a novel technology, in fact, the term FES was not used until 1967 when Moe and Post created it. (Moe & Post, 1962). This technology has been around, and a wide range of devices utilizing it are currently on the market to support patients' treatment and rehabilitation all over the world. As of right now, FES devices and technology are limited to gross motor function, have slow channel switching, simple repetitive stimulation patterns, and poor muscle selectivity. To design a multi-channel programmable waveform functional electrical stimulator (FES) device with independently controlled variable voltage and current, especially for senior care and at-home treatment, this thesis will use the concept of systems engineering in the design process. To achieve this thesis goal, a methodical approach incorporating requirements analysis, system architecture, dynamic modeling and simulation, modular design, and control system integration will be used. MATLAB/Simulink, a modeling tool for systems engineering, will be used to build a comprehensive system behavior model. This multi-channel FES device will be designed to provide faster channel response, faster switching, and increased muscle selectivity, all while minimizing user muscle fatigue. Using systems engineering principles covered in this thesis work for the design process of the multi-channel functional electrical stimulator will bring a plus to the current FES technology used in-home care and other settings. Researchers, engineers, and medical professionals may find the outcomes of this research beneficial to improve patient and future design outcomes.

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