ST. PAUL, Minn.--(BUSINESS WIRE)--Cardiovascular Systems, Inc. (CSI) (Nasdaq:CSII), a medical device company developing and commercializing innovative interventional treatment systems for peripheral and coronary artery disease, has been added to the Russell 2000® Index. The index measures the performance of the 2,000 largest U.S. companies based on total market capitalization. The Russell Investment Group recently reconstituted its indexes, and Russell 2000 membership went into effect at market close on June 24, 2011, and will remain in place for one year.
