Fe-Mn-Si Biyobozunur Stentlerin Mekanik Performansının Sonlu Eleman Simülasyonları Kullanılarak Değerlendirilmesi

Öz

Biyobozunur metal stentler, mekanik görevlerini yerine getirdikten sonra zamanla vücut içerisinde çözüldükleri ve bu nedenle gelecekte bir risk oluşturmadıkları için potansiyel stent adaylarıdır. Önceki çalışmalarda, Fe-30Mn-6Si biyobozunur alaşımı mekanik dayanım ve biyolojik olarak parçalanabilirlik açısından başarılı olduğu görülmüştür. Bu çalışmada, Fe-30Mn-6Si alaşımından yapılmış bir stentin genleşme ve geri tepme davranışı sonlu eleman analizleri kullanılarak incelenmiştir. Karşılaştırma için L605 Co-Cr ve 316L paslanmaz çelik stentler de incelenmiştir. Elde edilen sonuçlar, yeni FeMnSi stentinin muadillerine göre daha düşük eşdeğer gerilme sergilediğini göstermiştir. Öte yandan, en düşük eşdeğer plastik gerinim ve en yüksek radyal elastik geri tepme değeri FeMnSi stentte gözlenmiştir. Genel bulgular, FeMnSi stentin balon-stent etkileşimi bakımından orta düzeyde başarılı olduğunu göstermektedir.

Anahtar Kelimeler

• Biyobozunur stent
• Fe-Mn-Si Şekil Hafızalı Alaşım
• Sonlu Eleman Analizi
• Mekanik performans

Evaluation of Mechanical Performance of a Fe-Mn-Si Biodegradable Stent using Finite Element Simulations

Öz

Biodegradable metal stents are potential stent candidates as they dissolve in the body over time after fulfilling their mechanical duties and therefore do not pose a risk in the future. Fe-30Mn-6Si biodegradable alloy was found to be successful in the previous studies in terms of mechanical strength and biodegradability. In this study, the expansion and recoiling behavior of a stent made of Fe-30Mn-6Si alloy was investigated using finite element analyses. L605 Co-Cr and 316L stainless steel stents were also examined for comparison. Obtained results showed that novel FeMnSi stent exhibits lower equivalent stress than the counterparts. On the other hand, the lowest equivalent plastic strain and the highest radial elastic recoil value were observed in FeMnSi stent. Overall findings indicate that FeMnSi stent is moderately successful in terms of balloon-stent interaction.

Anahtar Kelimeler

• Biodegradable stent
• Fe–Mn–Si shape memory alloy
• finite element analysis
• mechanical performance

Kaynakça

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