Best and Worst Stocks of 2011

By Ben Steverman - 2011-12-14T19:18:53Z

Photograph by Intuitive Surgical, Inc./ via Bloomberg

Company Symbol % Change
6 of 23

Intuitive Surgical Inc.

Industry: Medical instruments

Total return: 68.3 percent

Intuitive Surgical (ISRG) said in October it expects sales to rise as much as 23 percent this year. The company's main product, the robotic "da Vinci" surgical system, converts doctor's hand motions into tiny movements inside a patient.