POWER OF ATTORNEY
The undersigned hereby constitutes and appoints Laurence Betterley,
Alexander Rosenstein, Jeffrey Points, Anne Meyer, Amanda Lorentz and
Ashley Brosius, 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 19thth day of February, 2017.
/s/ Martha Goldberg Aronson
