6. Hansen Medical ( HNSN) Company Profile: Hansen Medical develops medical robotics designed for accurate positioning, manipulation and control of catheters and catheter-based technologies. Shares of Hansen Medical jumped to a 52-week high of $5.28 in July, but the rally began in early February after Philips Electronics purchased the rights to develop and market Hansen Medical's Fiber Optic Shape Sensing and Localization, or FOSSL, technology for an upfront payment of $29 million. Hansen Medical is also eligible for $78 million in future payments. Current Share Price: $3.30 (Aug. 30) 2011 Total Return: 121% Analyst Ratings: JPMorgan and Lazard Capital analysts rate Hansen Medical as a "hold" while Piper Jaffray analysts say the stock is a "buy." TheStreet Ratings rates Hansen Medical a "sell," calling special attention to the company's weak operating cash flow.