POWER OF ATTORNEY
The undersigned hereby constitutes and appoints Laurence Betterley, James
Flaherty, Jeffrey Points, Michael Killeen, Alexander Rosenstein, Amanda
Schmall and Lori Cobb, or any one of them acting alone, the undersigned's true
and lawful attorney-in-fact and agent with full power of substitution and
resubstitution, for the undersigned and in the undersigned's name, place and
stead, in any and all capacities, to sign any or all Forms 3, 4 or 5 relating
to beneficial ownership of securities of Cardiovascular Systems, Inc. (the
"Issuer"), to file the same, with all exhibits thereto and other documents in
connection therewith, with the Securities and Exchange Commission and to
deliver a copy of the same to the Issuer, granting unto said attorney-in-fact
and agent full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the premises, as fully
to all intents and purposes as the undersigned might or could do in person,
hereby ratifying and confirming all said attorney-in-fact and agent, or his
substitute or substitutes, may lawfully do or cause to be done by virtue
thereof. The undersigned acknowledges that the foregoing attorney-in-fact, in
serving in such capacity at the request of the undersigned, is not assuming
any of the undersigned's responsibilities to comply with Section 16 of the
Securities Exchange Act of 1934.
This Power of Attorney shall remain in effect until such time as the
undersigned is no longer subject to the provisions of Section 16 of the
Securities Exchange Act of 1934 with respect to securities of the Issuer.
The undersigned hereby indemnifies the attorneys-in-fact for all losses
and costs the attorneys-in-fact may incur in connection with or arising from
the attorneys-in-fact's execution of their authorities granted hereunder.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 13th day of November, 2013.
/s/ Brent G. Blackey
Brent G. Blackey
