Springs, life savers

Springs save lives. Stents are tiny springs made of special metal that retains its shape. When a stent is squashed it later springs back to it original shape. Some people may have a blockage which prevents the blood flowing round the heart. A stent can be inserted which keeps the artery open so the blood can flow. In using stent, one must ensure that the metal must not corrode and that the spring maust be very, very small.