NEW YORK ( TheStreet) -- Shares of Cardiovascular Systems (Nasdaq: CSII) were gapping down Friday morning with an open price 10.4% lower than Thursday's closing price. The stock closed at $10.30 Thursday and opened today's trading at $9.23.

The average volume for Cardiovascular Systems has been 137,400 shares per day over the past 30 days. Cardiovascular Systems has a market cap of $173.3 million and is part of the health care sector and health services industry. Shares are down 11.7% year to date as of the close of trading on Thursday.

Cardiovascular Systems, Inc., a medical device company, focuses on developing and commercializing minimally invasive treatment solutions for vascular disease.

TheStreet Ratings rates Cardiovascular Systems as a sell. The area that we feel has been the company's primary weakness has been its disappointing return on equity. You can view the full Cardiovascular Systems Ratings Report.

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