NEW YORK ( TheStreet) -- Intuitive Surgical (Nasdaq: ISRG) is trading at unusually high volume Wednesday with 1.3 million shares changing hands. It is currently at 4.1 times its average daily volume and trading up $38.91 (+7.1%) at $584.44 as of 3:50 p.m. ET. Intuitive Surgical has a market cap of $21.36 billion and is part of the health care sector and health services industry. Shares are up 17.8% year to date as of the close of trading on Tuesday. Intuitive Surgical, Inc. designs, manufactures, and markets da Vinci surgical systems for various surgical procedures, including urologic, gynecologic, cardiothoracic, general, and head and neck surgeries. The company has a P/E ratio of 43.9, above the average health services industry P/E ratio of 43.8 and above the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Intuitive Surgical as a buy. The company's strengths can be seen in multiple areas, such as its robust revenue growth, largely solid financial position with reasonable debt levels by most measures, expanding profit margins, good cash flow from operations and impressive record of earnings per share growth. We feel these strengths outweigh the fact that the company is trading at a premium valuation based on our review of its current price compared to such things as earnings and book value. You can view the full Intuitive Surgical Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center.