 Cardiovascular Systems NASDAQ:CSII and Invivo Therapeutics NASDAQ:NVIV are both small-cap medical companies, but which is the superior business? We will contrast the two companies based on the strength of their dividends, valuation, earnings, profitability, analyst recommendations, risk and institutional ownership. Profitability This table compares Cardiovascular Systems and Invivo Therapeutics net margins, return on equity and ... 