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Application of Super-Elastic Alloys to Medical Stents that Self-Expand in Blood Vessels
Release Time:
Dec 19,2024
NiTi alloy tube used in Heart Stent
Blood vessels are pervasive in the body and serve as a conduit for circulating blood throughout the entire body. However, when the passage of blood becomes constricted or blocked, oxygen and nutrients are prevented from reaching certain tissues, and this can lead to disease. Sometimes blood vessels rupture, and this can result in very serious symptoms. In such a case, catheter treatment may be used to remove the blockage, widen the blood vessels, and maintain blood flow.
Devices such as guide wires and balloons are used to widen blood vessels, and structures called stents, which are shaped like mesh tubes, are inserted into blood vessels to maintain the lumen in them. Stents made from super-elastic NT alloys are deployed to the affected area through a catheter using a thin tube. When released from the catheter at the affected area, stents will self-expand to a given diameter to support the blood vessels from the inside. The use of a super-elastic alloy can greatly facilitate the maintenance of lumen and significantly reduce stress on the blood vessels since it flexibly adapts to the movements of the body.
Our OMD New Materials company has been supplying NiTi alloy tubes for use in the manufacture of mesh-type stents. One of the challenges of NiTi alloys is that mere deviation of 0.1% in the composition ratio will change the transformation temperature by about 10°C, thereby changing the mechanical properties of the material. NiTi alloys are high-tech products that require a high level of cleanliness, circularity, biostability, and durability since they are placed in the body after being processed in a stent.
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