Design and optimization of poly lactic acid/bioglass composite screw for orthopedic applications
محورهای موضوعی : فصلنامه شبیه سازی و تحلیل تکنولوژی های نوین در مهندسی مکانیک
عماد حسینی
1
(دانشجو)
انوشه زرگر خرازی
2
(استادیار، دانشکده فناوری‌های نوین، دانشگاه اصفهان، اصفهان، ایران.)
کلید واژه: Flexural Strength, poly-l-lactic acid, bioactive glass fibers, composite screw,
چکیده مقاله :
However, problems such as osteoporosis due to high elasticity of metals relative to bones, and local infections and systemic problems caused by releasing metallic ions have motivated research on replacing metallic screws with non metallic ones. In this study, the composite containing poly-l-lactic acid and bioactive glass fibers were considered for the design of the screw using ABAQUS software (V6.11). The elastic constants were first estimated in micro analysis then transferred to macro analysis for modeling in two-layer situations composed of unidirectional fibers and random fibers (UD/R) and also for modeling in three-layer situations composed of unidirectional fibers, fibers with an angle of ±20 degree in relation to force vector, and random fibers (UD /±20/R) with various percentages of layer thickness. Results show that in the analysis with %65 layers of unidirectional fibers, %10 layers by fibers with an angle of ±20 degree, and %25 of layers with random fibers, flexural modulus, flexural strength, and longitudinal elasticity coefficient were estimated about 22.7 GPa, 347 MPa, and 24.8 GPa respectively, the last one being slightly higher than that of cortical bone. Considering similar results for cortical bones, our designed composite screws are robust enough to replace metal screws for repairing orthopedic fractures
Considering their suitable strength and ability to properly stabilize, metal screws are used to repair bone fractures. پیچ های فلزی به دلیل استحکام مناسب جهت ترمیم شکستگی های استخوان مورد استفاده قرار می گیرند. اما مشکلاتی چون ضریب کشسانی بالای فلزات نسبت به استخوان های بدن که منجر به پدیده پوکی استخوان می گردد و نیز امکان رهایش یون های فلزی در موضعی که می توان منجر به ایجاد عفونت های موضعی یا مشکلات سیستمی شود ،جایگزینی پیچ های غیر فلزی به جای انواع فلزی را در دستور کار محققین قرار داده است. در این مطالعه کامپوزیت متشکل از فاز زمینه پلیمر پلی ال-لاکتیک اسید و فاز تقویت کننده الیاف شیشه زیست فعال جهت طراحی پیچ مد نظر قرار گرفت. ابتدا ضرایب کشسانی در آنالیز میکرو تخمین زده شد سپس به آنالیز ماکرو توسط نرم افزار آباکوس 6.11 برای مدل‌سازی با وضعیت‌های دولایه‌ای تشکیل شده از الیاف تک جهته و رندوم (UD/R) و سه لایه ای متشکل از الیاف تک جهته ،الیاف با زاویه 20± درجه نسبت به اعمال نیرو و الیاف رندوم (UD/±20/R) با درصد های مختلف از ضخامت لایه ها انتقال داده شد. نتایج نشان داد ترکیب کامپوزیت سه لایه با درصد لایه های(25/10/65) دارای مناسب ترین پاسخ مکانیکی می باشد. در این نمونه با درصد لایه های (25/10/65) مدول خمشی 7/22 گیگا پاسکال ،استحکام خمشی 347 مگاپاسکال و ضریب کشسانی در راستای طولی 8/24 گیگا پاسکال تخمین زده شد. که مقداری از ضریب کشسانی استخوان کورتیکال بیشتر است. پیچ کامپوزیتی طراحی شده جهت تثبیت شکستگی ارتوپدی از استحکام لازم برخوردار است و به عنوان کاندیدی جهت جایگزینی پیچ های فلزی قابل استفاده است.
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