How is radial strength defined in terms of stents?

• A. Ability to retain its length
• B. Ability to resist compressive forces
• C. Ability to conform to vessel curves
• D. Ability to deliver medication effectively

Answer: (B)

Radial strength, when referring to stents, is defined as the ability of the stent to resist compressive forces. This characteristic is crucial because, once a stent is implanted in a blood vessel, it is subject to various mechanical forces that can try to compress or collapse it, particularly from the surrounding tissue, blood flow, or movement of the body. High radial strength ensures that the stent maintains its structure and luminal diameter, facilitating continuous blood flow and preventing re-stenosis or other complications.

While other factors like length retention, conformability to vessel shapes, and drug delivery are important characteristics of stents, they do not directly relate to radial strength. Length retention pertains more to the stent's ability to maintain its size post-deployment, conformability refers to how well a stent can adapt to the anatomical variations of blood vessels, and effective medication delivery involves the stent’s capacity to release drugs appropriately for therapeutic benefits. Each of these aspects supports different functional properties of stents, but radial strength specifically addresses the stent’s resistance to external compressive stresses.