Intuitive Surgical ( ISRG), a maker of surgical robotics, reported a 12.9% rise in profits, led by higher sales. The company earned $16.68 million, or 44 cents a share, in the quarter, compared with $14.78 million, or 40 cents a share, a year ago. Excluding the impact of stock compensation expenses, the company earned 55 cents a share for the latest quarter. Analysts polled by Thomson First Call were expecting earnings of 40 cents a share in the most recent quarter. Second-quarter revenue rose 65% from the year-ago quarter to $87.03 million. Higher sales were driven by increased da Vinci surgical system sales and continued growth in recurring revenue. Analysts polled by Thomson First Call were estimating revenue of $81.97 million in the second quarter. Second-quarter system revenue rose 68.8% to $48.1 million. Second-quarter instrument and accessory revenue increased 61% to $26.1 million. Intuitive sold 39 da Vinci surgical systems during the second quarter, compared with 26 in the previous year quarter. Second quarter operating income was $24.5 million compared with $15.3 million for the second quarter of 2005. Excluding the $6.5 million of non-cash stock compensation expense, second quarter operating income was $31.0 million. "We are pleased with our second quarter revenue and bottom line growth, which were driven by higher procedure volume across all of our targeted surgical specialties," said the company. "Adoption of da Vinci Surgery continues as we remain dedicated to providing the most effective, least invasive surgical treatment option available." Shares slid $13.32 to $98.12 Thursday.