Catheter balloons can be life-savers for people with vasoconstriction. During medical procedures, a physician guides the catheter balloon through the blood vessel to the vasoconstriction where the balloon attached to catheter is expand- ed with 8–20 bar. This extends the vessel so that the blood can flow freely again. Different balloon sizes and shapes are used, depending on the type and location of the constriction. Expandable balloons are produ

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