Quasi-Static Analysis of Stent Design with Negative Poisson’s Ratio by Three Layered Artery and Asymmetrical Plaque

Öz

In biodegradable stent designs, open cell models in curvilinear strat form cause high vessel damage due to high foreshortening rate and dogboning. It is stated that since the damage in the artery causes in-stent restenosis and migration of stent in the early period, the disadvantageous situation can be eliminated thanks to geometric innovations. Stent designs with a Negative Poisson’s ratio provide a minimum foreshortening rate. However, dogboning does not occur in stent expansion. In this study, the stent-artery coverage ratio was determined as 26.3% for the NPR stent, which was designed as four unit cells in the circumferential wall direction. A four-stage numerical analysis of the NPR stent was performed within the three-layered arterial structure including asymmetric plaque. In the analyzes made for the NPR stent with high yield strength and low strut thickness in the PLLA material model, the foreshortening ratio was 12% and the recoil ratio was 1.19%. The positioning of the stent on the arterial wall is improved, as a 10% lower longitudinal displacement is achieved compared to the Absorb BVS curvilinear design.

Anahtar Kelimeler

• NPR stent
• Biodegradable stent
• Foreshortening
• Recoil

Negatif Poisson Oranındaki Stent Tasarımının Üç Katmanlı Arter ve Asimetrik Plak Yapısına Göre Sanki-Statik Analizi

Öz

Biyobozunur stent tasarımlarında eğrisel strat formunda açık hücre modelleri yüksek kısalma oranı ve uç açılması nedeniyle yüksek damar hasarı oluşturmaktadır. Arterde oluşan hasarın erken dönemde stent içi daralmaya ve stentin kaymasına sebep olduğundan geometrik yenilikler sayesinde dezavantajlı durumun giderilebileceği belirtilmektedir. Negatif Poisson oranına (NPR) sahip olan stent tasarımlarında minimum oranda kısalma oranı sağlanmaktadır. Bununla birlikte stent genişlemesinde uç açılması oluşmamaktadır. Bu çalışmada, çeper doğrultusunda dört öksetik geometri olarak tasarlanan NPR stent için stent-arter kaplama oranı % 26,3 olarak belirlenmiştir. NPR stentin asimetrik plak içeren üç katmanlı arter yapısı içerisinde dört aşamalı olarak sayısal analizi gerçekleştirilmiştir. PLLA malzeme modelinde yüksek akma dayanımı ve düşük strat kalınlığındaki NPR stent için yapılan analizlerde, kısalma oranı % 12 ve geri daralma oranı % 1,19 olarak elde edilmiştir. Absorb BVS eğrisel tasarımla kıyaslandığında % 10 daha düşük miktarda uzunlamasına yer değiştirme elde edildiğinden, stentin arter duvarındaki konumlanması iyileştirilmiştir.

Anahtar Kelimeler

• NPR stent
• Biyobozunur stent
• Kısalma oranı
• Geri daralma

Kaynakça

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