| Summary: | 碩士 === 國立高雄第一科技大學 === 電子工程研究所 === 99 === This research constructs a portable Electromyogram (EMG) system and a stimulator for patellofemoral painsyndrome (PFPS) patients, to reduce the pain caused by the imbalance between the Vastus medialis obliquus (VMO) and the Vastus lateralis (VL).
To the problems that PFPS patients have longer VMO contraction time and weaker EMG of VMO compared to the VL, making their quadriceps femoris muscles lose coordination and pull out their patella, and therefore leading to the increased pressure of the articular surface and pain caused by it, we propose a solution. Based on the electrical system, this research will design a measurement system which can quickly detect the EMGs of the VMO and VL, and instantly give muscles adequate time of electrical stimulation to assist VMO in contracting and pulling the patella back to the femoral trochlear groove, to reduce PFPS patients’ pain.
The EMG measurement circuit and electrical stimulation device proposed by this research are specifically designed for VMO and VL, possess real-time waveform recording and analyzing functions, and can upload their measurement data to the computer for storage and analysis. The system can calculate and record the time difference between the EMGs of VMO and VL, and the signal strengths of both EMGs. At the moment the system detects generation of the EMG of VL, it quickly calculates and processes the event and stimulates the VMO as feedback through electrical stimulation units, to induce it to contract. The system can adjust the signal strength, time length and sequence of the electrical stimulation manually and automatically.
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