Bioabsorbable stents

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1], Associate Editor(s)-In-Chief Raviteja Reddy Guddeti, M.B.B.S.

Overview

Bioabsorbable stents also known as the disappearing stents are a promising new discovery in the field of Interventional Cardiology.They have been an interesting field of research over the past decade and half.As the name suggests they get absorbed over a period of time after their work has been done.The concept of bioabsorbable stents came into existence because there have been some unmet needs by the traditional bare metal stents such as thrombosis,drug platform,MRI-CT imaging,no implant and facilitating reintervention.

Types

Company Polymer Features
Igaki Medicals Poly-L-Lactic acid Contains no drug, self expanding
REVA Medical Poly(DTE carbonate) with Iodine on the backbone Slide and lock design, paclitaxel drug eluting stent
Biotronic Magnesium-alloy Pimecrolimus drug eluting stent,Balloon expanding
Abbott Vascular Poly-L-Lactic acid Everolimus drug eluting stent,self expanding

Advantages

The main advantages these Bioabsorbable stents can offer over the traditional bare metal stents are:

  • No late stent thrombosis - the stent being absorbed completely leaves behind no stimulus to ignite a chronic inflammatory process and thus in turn reducing the rate of late stent thrombosis which is a major concern of the traditional stents.
  • Short duration of post-stenting use of dual anti-platelet drugs.
  • Obviates metal implants in vessels, leaves only healed natural vessel
  • Facilitates reintervention (PCI and CABG)
  • Prevents the constrictive vascular remodeling postdilatation due to the scaffolding effect of the stent and after being absorbed completely allows late expansive luminal and vessel remodeling.
  • Increased drug loading capabilities that will enable chronic drug release strategies.
  • In the long run, eliminates mechanical stent deformity and strut fractures
  • Can be used in peripheral arteries like the tibial artery,femoral artery etc.

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