Although the pouches are considered a tobacco product, they don’t contain any tobacco, and are instead made from the plant fiber cellulose. There’s a blend of nicotine powder in the pouch, which is then mixed with sweeteners and flavoring. Because the pouch is placed between one’s gums and cheek, the nicotine enters the bloodstream directly, no smoking or spitting needed.
不过，要理解核心医疗的突围，首先必须明白造一颗“人工心脏”到底有多难——人工心脏是通过微创或开胸手术，在患者左心室心尖部打孔，接入一个极其精密的“微型金属水泵”。这个水泵将左心室无法泵出的血液抽出，直接打入升主动脉，从而代替左心室承担全身的血液循环。
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