What Could Lift ISRG Stock?

Intuitive Surgical (ISRG) stock has lost 8.2% over the past twelve months, while the S&P 500 returned 17.1%. If you own it, you have watched the market move on without you, and if you do not, the lower price may look tempting. Either way, you are counting on the business behind the da Vinci systems. So what would Intuitive have to sell more of for the stock to climb again.