Ta ion implanted nanoridge-platform for enhanced vascular responses

Tae Sik Jang, Jae Hwan Lee, Sungwon Kim, Cheonil Park, Juha Song, Hwan Jun Jae, Hyoun Ee Kim, Jin Wook Chung, Hyun Do Jung

Research output: Contribution to journalArticle

Abstract

Bare metal stents are commonly used in interventional cardiology; they provide successful treatment because of their excellent mechanical properties, expandability ratios, and flexibility. However, their insufficient vascular affinity can induce the development of neointimal hyperplasia following arterial injury and subsequent smooth muscle cell overgrowth in the lumen of a stented vessel. Nanoengineering of the bare metal stent surface is a valuable strategy for eliciting favorable vascular responses. In this study, we introduce a target-ion-induced plasma sputtering (TIPS) technique to fabricate a platform with a favorable endothelial environment. This technique enables the simple single-step production of a Ta-implanted nanoridged surface on a stent with a complex 3D geometry that shows a clear tendency to become oriented parallel to the direction of blood flow. Moreover, the nanoridges developed show good structural integrity and mechanical stability, resulting in apparently stable morphologies under high strain rates. In vitro cellular responses to the Co–Cr, such as endothelialization, platelet activation, and blood coagulation, are considerably altered after TIPS treatment; endothelium formation is rapid and surface thrombogenicity is low. An in vivo rabbit iliac artery model is used to confirm that the nanoridged surface facilitates rapid re-endothelialization and limits the formation of neointima compared to the bare stent. These results indicate that the Ta ion implanted nanoridge platform fabricated using the TIPS technique has immense potential as a solution for in-stent restenosis and ensuring the long-term patency of bare metal stents.

Original languageEnglish
Article number119461
JournalBiomaterials
Volume223
DOIs
StatePublished - 1 Dec 2019

Fingerprint

Stents
Blood Vessels
Ions
Sputtering
Metals
Plasmas
Blood
Cardiology
Neointima
Mechanical stability
Iliac Artery
Platelet Activation
Blood Coagulation
Structural integrity
Platelets
Coagulation
Smooth Muscle Myocytes
Endothelium
Hyperplasia
Muscle

Keywords

  • Endothelialization
  • Metal stent
  • Nanoridge
  • Restenosis
  • Tantalum

Cite this

Jang, Tae Sik ; Lee, Jae Hwan ; Kim, Sungwon ; Park, Cheonil ; Song, Juha ; Jae, Hwan Jun ; Kim, Hyoun Ee ; Chung, Jin Wook ; Jung, Hyun Do. / Ta ion implanted nanoridge-platform for enhanced vascular responses. In: Biomaterials. 2019 ; Vol. 223.
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Ta ion implanted nanoridge-platform for enhanced vascular responses. / Jang, Tae Sik; Lee, Jae Hwan; Kim, Sungwon; Park, Cheonil; Song, Juha; Jae, Hwan Jun; Kim, Hyoun Ee; Chung, Jin Wook; Jung, Hyun Do.

In: Biomaterials, Vol. 223, 119461, 01.12.2019.

Research output: Contribution to journalArticle

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T1 - Ta ion implanted nanoridge-platform for enhanced vascular responses

AU - Jang, Tae Sik

AU - Lee, Jae Hwan

AU - Kim, Sungwon

AU - Park, Cheonil

AU - Song, Juha

AU - Jae, Hwan Jun

AU - Kim, Hyoun Ee

AU - Chung, Jin Wook

AU - Jung, Hyun Do

PY - 2019/12/1

Y1 - 2019/12/1

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AB - Bare metal stents are commonly used in interventional cardiology; they provide successful treatment because of their excellent mechanical properties, expandability ratios, and flexibility. However, their insufficient vascular affinity can induce the development of neointimal hyperplasia following arterial injury and subsequent smooth muscle cell overgrowth in the lumen of a stented vessel. Nanoengineering of the bare metal stent surface is a valuable strategy for eliciting favorable vascular responses. In this study, we introduce a target-ion-induced plasma sputtering (TIPS) technique to fabricate a platform with a favorable endothelial environment. This technique enables the simple single-step production of a Ta-implanted nanoridged surface on a stent with a complex 3D geometry that shows a clear tendency to become oriented parallel to the direction of blood flow. Moreover, the nanoridges developed show good structural integrity and mechanical stability, resulting in apparently stable morphologies under high strain rates. In vitro cellular responses to the Co–Cr, such as endothelialization, platelet activation, and blood coagulation, are considerably altered after TIPS treatment; endothelium formation is rapid and surface thrombogenicity is low. An in vivo rabbit iliac artery model is used to confirm that the nanoridged surface facilitates rapid re-endothelialization and limits the formation of neointima compared to the bare stent. These results indicate that the Ta ion implanted nanoridge platform fabricated using the TIPS technique has immense potential as a solution for in-stent restenosis and ensuring the long-term patency of bare metal stents.

KW - Endothelialization

KW - Metal stent

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