Shares of Intuitive Surgical ( ISRG) soared 21% after the company said third-quarter earnings tripled.

The Sunnyvale, Calif., surgical robotics firm said it made $21 million, or 55 cents a share, for the quarter ended Sept. 30, up from the year-ago $6.1 million, or 17 cents a share. Revenue surged 72% from a year ago to $61 million, driven by the sale of 30 da Vinci surgical systems.

Wall Street analysts had expected a 29-cent profit on sales of $50 million.

"We are pleased with our third quarter revenue and operating profit growth," said CEO Lonnie Smith. "These financial results reflect the continued adoption of da Vinci Surgery, which enables surgeons and medical centers to provide the high-value procedures sought after by today's highly informed patients."

Intuitive Surgical's stock jumped $15.12 late Tuesday to $87.11.