When Sunnyvale, Calif.-based Intuitive Surgical hit the market in 1999 with its surgical robot, da Vinci, the company and many of its early adopters hailed the new technology as a revolution that would benefit patients, surgeons and the health care system as a whole. Da Vinci combines high-definition visual tools with robot-guided medical instruments that allow surgeons to do complicated procedures using a few tiny incisions. The da Vinci system, which is widely used in urologic surgeries such as the removal of prostate tumors, has been shown by Intuitive and outside researchers to reduce post-surgery complications and shorten hospital stays.