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

Hakan Burçin Erdoğuş

Makale detayları

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

Yazarlar:

Hakan Burçin Erdoğuş

Yayıncı:

Gazi University

Ana Başlıklar:

Mühendislik

Dergi:

Politeknik Dergisi Vol.27 Issue 5, pp.1673-1680

Belge Tipi:

Makale

Yayın Tarihi:

2/2024

Belge Dili:

Türkçe

Document ID (Org No.):

2001331570

pISSN:

2147-9429

Anahtar kelimeler:

Özet:

 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 Poissons 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.

 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 Poissons 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.

 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 Poissons 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.

 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.

Makale detayları

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

Yazarlar:

Hakan Burçin Erdoğuş

Yayıncı:

Gazi University

Ana Başlıklar:

Mühendislik

Dergi:

Politeknik Dergisi Vol.27 Issue 5, pp.1673-1680

Belge Tipi:

Makale

Yayın Tarihi:

2/2024

Belge Dili:

Türkçe

Document ID (Org No.):

2001331570

pISSN:

2147-9429

NPR stent

Biodegradable stent

Foreshortening

RecoilNPR stent

Biyobozunur stent

Kısalma oranı

Geri daralma

Sayı

Makale detayları

Yazarlar: Hakan Burçin Erdoğuş

Yayıncı: Gazi University

Ana Başlıklar: Mühendislik

Dergi: Politeknik Dergisi Vol.27 Issue 5, pp.1673-1680

Belge Tipi: Makale

Yayın Tarihi: 2/2024

Belge Dili: Türkçe

Document ID (Org No.): 2001331570

pISSN: 2147-9429

Sayı

Yazarlar:

Hakan Burçin Erdoğuş

Yayıncı:

Gazi University

Ana Başlıklar:

Mühendislik

Dergi:

Politeknik Dergisi Vol.27 Issue 5, pp.1673-1680

Belge Tipi:

Makale

Yayın Tarihi:

2/2024

Belge Dili:

Türkçe

Document ID (Org No.):

2001331570

pISSN:

2147-9429