The LEDs' cool temperatures don't burn or scar, which laser treatments are known to do.

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Called pseudocysts, these noncancerous (benign) pockets of fluids are lined with scar or inflammatory tissue, not the type of cells found in true cysts.

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The reclogging occurs because the body, viewing the stent as an invader or an injury, forms scar tissue around the device, clumping things up again.

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When the eschar falls off, which is usually a week or two later, it leaves a permanent scar.

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But sometimes scar tissue formed inside the stent, causing artery to close up again-leading to a repeat procedure or to heart bypass surgery.

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