Intuitive Surgical's business starts with the sale of a da Vinci surgical robot, but that's not where it ends.Intuitive Surgical (ISRG +3.29%) is a growth stock, and because of that, it is evaluated differently by investors. For instance, investors pay a huge amount of attention to the number of da Vinci surgical robots that it sells every quarter.And yet, while the company's business model depends on the sale of da Vinci robots, that's not the real driver of the business. In 10 years, the power of Intuitiv ...