What is nitinol stent?
Nitinol stents are manufactured to a size slightly larger than the target vessel size and delivered constrained in a delivery system. After deployment, they position themselves against the vessel wall with a low, “chronic” outward force. They resist outside forces with a significantly higher radial resistive force.
What type of stent is Supera?
The Supera peripheral stent is a woven self-expanding stent constructed from nitinol. Six pairs of closed-ended interwoven nitinol wires are arranged in a helical pattern designed to be both flexible and resistant to fracture.
How does balloon expandable stent work?
Once in good position across the lesion the stent is expanded by inflating the balloon. The balloon first inflates at both ends of the stent followed by expansion in the center, allowing for precise positioning.
What are self expanding stent?
Mechanical self-expanding stents are devices composed of stainless steel, which are compressed within a delivery catheter and rely on a mechanical “springlike” design to achieve expansion.
Why is Nitinol good for stents?
The mechanical properties of the Nitinol alloy provide unique biomechanical characteristics to stents. Due to the shape memory effect, Nitinol stents ”self-expand”, i.e., they are deployed without the use of an expanding balloon.
What is special about Nitinol?
Nitinol is a metal alloy of nickel and titanium with unique properties, including superelasticity or pseudoelasticity and “shape memory” properties. That means nitinol can remember its original shape and return to it when heated. It also shows great elasticity under stress.
What is Zilver PTX?
Zilver PTX is made of nitinol, a “shape memory” metal alloy, and is engineered to withstand the dynamic forces of the superficial femoral artery (SFA). Zilver PTX is the first peripheral vascular device that combines the mechanical support of stenting with the drug paclitaxel to reduce the risk of restenosis.
What is covered stent?
Covered stents are composed of fabric or graft material, such as polytetrafluoroethylene (PTFE), covering a metal stent. They have various clinical applications in peripheral arterial disease management.
What is a smart stent?
Researchers have developed a type of ‘smart stent’ that monitors even subtle changes in the flow of blood through the artery, detecting the narrowing in its earliest stages and making early diagnosis and treatment possible.
Where are nitinol stents used?
Nevertheless, because of these unique mechanical characteristics, in combination with excellent biocompatibility, Nitinol is used as self-expanding endovascular stents to scaffold diseased peripheral arteries.
Why is Nitinol used?
Nitinol is used for the wiring and brackets that connect teeth. It’s the perfect choice for braces because the alloy is able to bend and shape itself to the requirements of the patient’s tooth formation. In endodontics, Nitinol is used during root canals, specifically for cleaning and helping to shape the root canal.
What is a self expanding Nitinol stent?
Self-expanding Nitinol stents are manufactured with a diameter larger than that of the target vessel. Their transfonnation temperature is typically set to 30 degrees C. They can be easily crimped at or below room temperature and placed in a delivery system.
Why are Micro-Tech stents made with nitinol wire?
Every stent from the MICRO-TECH range is manufactured using high quality Nitinol wire. The “thermal memory effect” of Nitinol causes the released stent to unfold into its predetermined dimensions at body temperature. It therefore adapts to the anatomy and achieves the desired dilation of the stenosis in an optimum manner.
Why do stents come preloaded?
In order to make release of the stent as easy as possible, the stents are preloaded on an introducer. The system can be manipulated intuitively and effortlessly. With some stents you even have the opportunity to correct the positioning of the stent during implantation.
Is nitinol good for medical implants?
Material Considerations Nitinol is an alloy composed of 55 w.% nickel and balance titanium. It has found widespread acceptance as a material of choice for medical implants and devices [4].