Piper Jaffray weighs in on Thoratec (THOR +11.2%) by upgrading the shares to Overweight on its...

|About: Thoratec Corporation (THOR)|By:, SA News Editor

Piper Jaffray weighs in on Thoratec (THOR +11.2%) by upgrading the shares to Overweight on its strong earnings report, noting the recent quarter shows surprising unit growth.