طراحي و شبيه سازي ارتز قوزك بيمار محور با عملگر فنر پيچشي

Design and Simulation of a patient-specific ankle orthosis using torsional spring

افتادگي مچ پا يكي از اختلالات عصبي-عضلاني مي باشد كه از ضعف يا فلج بودن عضلات پري تيبيال نشات مي گيرد. دو عارضه اصلي افتادگي مچ پا، برخورد ضربه-اي كف پا بعد از فاز برخورد اوليه و كشيده شدن انگشتان پا بر زمين در طي فاز گام برداري مي باشد. در اين مقاله با طراحي ارتز مناسب، نياز بيماران مختلف داراي ضعف عضله ي پري تيبيال در دو فاز گام برداري و فاز پاسخ بارگزاري پاسخ داده شده است. مقدار گشتاور موردنياز در هر گام زماني براي تقليد سفتي مفصل قوزك سالم، به صورت بهينه شده محاسبه مي شود.

People suffering from neuromuscular diseases, may also face certain abnormalities in their walking pattern. dro‎p foot patients suffer from some restrictions in dorsiflexion as well as in controlling their plantarflexion during the gait cycle because of abnormal stiffness pattern of the ankle joint. The two major complications of drop foot are slapping of the foot after heel strike (foot slap) and dragging of the toe during swing (toe drag). The current treatment options like Ankle Foot Orthosis (AFO) while offering some biomechanical benefits, do not adapt to different walking conditions and fail to eliminate significant gait complications. This study proposes a passive Ankle Foot Orthosis design which combines an AFO and torsional spring. The required moment to reproduce the stiffness of a normal ankle joint is calculated using the OpenSim software package in conjunction with the data collected from the motion analysis of each patient. Torsional spring was then used to reproduce the calculated moment for different levels of muscles weakness. It is shown that by designing patient-specific orthosis, the stiffness profile of normal joint for each patient with distinct level of muscles weakness can be reproduced.