Exhibit 10.19

RESTRICTED STOCK UNIT AGREEMENT

CARDIOVASCULAR SYSTEMS, INC.

AMENDED AND RESTATED 2007 EQUITY INCENTIVE PLAN

THIS AGREEMENT, made effective as of this      day of             , 20     by and between CARDIOVASCULAR SYSTEMS, INC., a Delaware corporation (the “Company”), and                                          (“Participant”).

W I T N E S S E T H:

WHEREAS, Participant on the date hereof is a nonemployee director of the Company or one of its Subsidiaries; and

WHEREAS, the Company wishes to grant a restricted stock unit award to Participant for shares of the Company’s Common Stock pursuant to the Company’s Amended and Restated 2007 Equity Incentive Plan (the “Plan”); and

WHEREAS, the Administrator of the Plan has authorized the grant of a restricted stock unit award to Participant;

NOW, THEREFORE, in consideration of the premises and of the mutual covenants herein contained, the parties hereto agree as follows:

1. Grant of Restricted Stock Unit Award; Term. The Company hereby grants to Participant on the date set forth above a restricted stock unit award (the “Award”) for                                          (                ) restricted stock units on the terms and conditions set forth herein. Each restricted stock unit shall entitle the Participant to receive either one share of the Company’s Common Stock or a cash payment, as described in Paragraph 3 below.

2. Vesting of Restricted Stock Units.

a. General. The restricted stock units subject to this Award shall vest according to the following schedule:

Subject to such other terms and conditions set forth in this Agreement, the Participant shall not be entitled to the issuance of shares of Stock or any cash payment for any portion of the restricted stock units subject to this Award until the Administrator determines the number of restricted stock units, if any, which have vested.

b. Termination of Relationship. If the Participant ceases to be a nonemployee director of the Company or any Subsidiary at any time during the term of the Award, for any reason, this Award shall terminate and all restricted stock units subject to this Award that have not vested or for which the risks of forfeiture have not lapsed shall be forfeited by Participant.

3. Issuance of Shares or Payment. Within thirty (30) days after the six-month anniversary of the date the Participant ceases to be a nonemployee director (the “Anniversary Date”), the Company shall cause to be issued a stock certificate representing that number of shares of Common Stock which is equivalent to the percentage of restricted stock units for which the risks of forfeiture have lapsed, less any shares withheld for payment of taxes as provided in Section 4(c) below, and shall deliver such certificate to Participant. Until the issuance of such shares, Participant shall not be entitled to vote the shares of Common Stock represented by such restricted stock units, shall not be entitled to receive dividends attributable to such shares of Common Stock, and shall not have any other rights as a shareholder with respect to such shares.

Alternatively, the Company may, in its sole discretion, pay Participant a lump sum payment, in cash, equal to the Fair Market Value of that number of shares of Common Stock which is equivalent to the percentage of restricted stock units for which the risks of forfeiture have lapsed. Such Fair Market Value shall be determined as of the Anniversary Date. If the Company makes such cash payment, the Participant shall not be entitled to vote the shares of Common Stock represented by such restricted stock units, shall not be entitled to receive dividends attributable to such shares of Common Stock, and shall not have any other rights as a shareholder with respect to such shares, whether before or after the vesting date.

4. General Provisions.

a. Employment or Other Relationship. This Agreement shall not confer on Participant any right with respect to continuance as a director or any other relationship by the Company or any of its Subsidiaries, nor will it interfere in any way with the right of the Company to terminate such employment or relationship. Nothing in this Agreement shall be construed as creating an employment contract or any other contract for any specified term between Participant and the Company or any Subsidiary.

b. Mergers, Recapitalizations, Stock Splits, Etc. Except as otherwise specifically provided in any employment, change of control, severance or similar agreement executed by the Participant and the Company, pursuant and subject to Section 14 of the Plan, certain changes in the number or character of the Common Stock of the Company (through merger, consolidation, exchange, reorganization, divestiture (including a spin-off), liquidation, recapitalization, stock split, stock dividend or otherwise) shall result in an adjustment, reduction or enlargement, as appropriate, in Participant’s rights with respect to any restricted stock units subject to this Award which continue to be subject to risks of forfeiture (i.e., Participant shall have such “anti-dilution” rights under the Award with respect to such events, but shall not have “preemptive” rights).

c. Withholding Taxes. To permit the Company to comply with all applicable federal and state income tax laws or regulations, the Company may take such action as it deems appropriate to ensure that, if necessary, all applicable federal and state payroll, income or other taxes attributable to this Award are withheld from any amounts payable by the Company to the Participant. If the Company is unable to withhold such federal and state taxes, for whatever reason, the Participant hereby agrees to pay to the Company an amount equal to the amount the Company would otherwise be required to withhold under federal or state law prior to the issuance of any certificates for the shares of Stock subject to this Award. Subject to such rules as the Administrator may adopt, the Administrator may, in its sole discretion, permit Participant to satisfy such withholding tax obligations, in whole or in part, by delivering shares of the Company’s Common Stock. Such shares shall have a Fair Market Value equal to the minimum required tax withholding, based on the minimum statutory withholding rates for federal and state tax purposes, including payroll taxes, that are applicable to the supplemental income attributable to this Award. In no event may the Participant deliver shares having a Fair Market Value in excess of such statutory minimum required tax withholding. The Participant’s election to deliver shares for this purpose shall be made on or before the date that the amount of tax to be withheld is determined under applicable tax law. Such election shall be approved by the Administrator and otherwise comply with such rules as the Administrator may adopt to assure compliance with Rule 16b-3, or any successor provision, as then in effect, of the General Rules and Regulations under the Securities Exchange Act of 1934, if applicable.

d. Amended and Restated 2007 Equity Incentive Plan. The Award evidenced by this Agreement is granted pursuant to the Plan, a copy of which Plan has been made available to Participant and is hereby incorporated into this Agreement. This Agreement is subject to and in all respects limited and conditioned as provided in the Plan. The Plan governs this Agreement and, in the event of any questions as to the construction of this Agreement or in the event of a conflict between the Plan and this Agreement, the Plan shall govern, except as the Plan otherwise provides.

e. Scope of Agreement. This Agreement shall bind and inure to the benefit of the Company and its successors and assigns and Participant and any successor or successors of Participant permitted by this Agreement. This Award is expressly subject to all terms and conditions contained in the Plan and in this Agreement, and Participant’s failure to execute this Agreement shall not relieve Participant from complying with such terms and conditions.

f. Arbitration. Any dispute arising out of or relating to this Agreement or the alleged breach of it, or the making of this Agreement, including claims of fraud in the inducement, shall be discussed between the disputing parties in a good faith effort to arrive at a mutual settlement of any such controversy. If, notwithstanding, such dispute cannot be resolved, such dispute shall be settled by binding arbitration. Judgment upon the award rendered by the arbitrator may be entered in any court having jurisdiction thereof. The arbitrator shall be a retired state or federal judge or an attorney who has practiced securities or business litigation for at least 10 years. If the parties cannot agree on an arbitrator within 20 days, any party may request that the chief judge of the District Court of Hennepin County, Minnesota, select an

arbitrator. Arbitration will be conducted pursuant to the provisions of this Agreement, and the commercial arbitration rules of the American Arbitration Association, unless such rules are inconsistent with the provisions of this Agreement. Limited civil discovery shall be permitted for the production of documents and taking of depositions. Unresolved discovery disputes may be brought to the attention of the arbitrator who may dispose of such dispute. The arbitrator shall have the authority to award any remedy or relief that a court of this state could order or grant; provided, however, that punitive or exemplary damages shall not be awarded. The arbitrator may award to the prevailing party, if any, as determined by the arbitrator, all of its costs and fees, including the arbitrator’s fees, administrative fees, travel expenses, out-of-pocket expenses and reasonable attorneys’ fees. Unless otherwise agreed by the parties, the place of any arbitration proceedings shall be Hennepin County, Minnesota.

g. Right to Amend. The Company hereby reserves the right to amend this Agreement without Participant’s consent to the extent necessary or desirable to comply with the requirements of Code Section 409A and the regulations, notices and other guidance of general application issued thereunder.

5. Change of Control. Notwithstanding anything in the Plan or this Agreement to the contrary, this Award shall become fully vested upon a Change of Control. For purposes of this Agreement, a “Change of Control” shall mean the occurrence, in a single transaction or in a series of related transactions, of any one or more of the following events. For purposes of this definition, a person, entity or group shall be deemed to “Own,” to have “Owned,” to be the “Owner” of, or to have acquired “Ownership” of securities if such person, entity or group directly or indirectly, through any contract, arrangement, understanding, relationship or otherwise, has or shares voting power, which includes the power to vote or to direct the voting, with respect to such securities.

(a) Any person, entity or group becomes the Owner, directly or indirectly, of securities of the Company representing more than fifty percent (50%) of the combined voting power of the Company’s then outstanding securities other than by virtue of a merger, consolidation or similar transaction. Notwithstanding the foregoing, a Change in Control shall not be deemed to occur (i) on account of the acquisition of securities of the Company by an investor, any affiliate thereof or any other person, entity or group from the Company in a transaction or series of related transactions the primary purpose of which is to obtain financing for the Company through the issuance of equity securities or (ii) solely because the level of Ownership held by any person, entity or group (the “Subject Person”) exceeds the designated percentage threshold of the outstanding voting securities as a result of a repurchase or other acquisition of voting securities by the Company reducing the number of shares outstanding, provided that if a Change in Control would occur (but for the operation of this sentence) as a result of the acquisition of voting securities by the Company, and after such share acquisition, the Subject Person becomes the Owner of any additional voting securities that, assuming the repurchase or other acquisition had not occurred, increases the percentage of the then outstanding voting securities Owned by the Subject Person over the designated percentage threshold, then a Change in Control shall be deemed to occur;

(b) There is consummated a merger, consolidation or similar transaction involving (directly or indirectly) the Company and, immediately after the consummation of such merger, consolidation or similar transaction, the stockholders of the Company immediately prior thereto do not Own, directly or indirectly, either (i) outstanding voting securities representing more

than fifty percent (50%) of the combined outstanding voting power of the surviving entity in such merger, consolidation or similar transaction or (ii) more than fifty percent (50%) of the combined outstanding voting power of the parent of the surviving entity in such merger, consolidation or similar transaction, in each case in substantially the same proportions as their Ownership of the outstanding voting securities of the Company immediately prior to such transaction;

(c) There is consummated a sale, lease, exclusive license or other disposition of all or substantially all of the total gross value of the consolidated assets of the Company and its subsidiaries, other than a sale, lease, license or other disposition of all or substantially all of total gross value of the consolidated assets of the Company and its subsidiaries to an entity, more than fifty percent (50%) of the combined voting power of the voting securities of which are Owned by stockholders of the Company in substantially the same proportions as their Ownership of the outstanding voting securities of the Company immediately prior to such sale, lease, license or other disposition (for purposes of this Paragraph 4(c), “gross value” means the value of the assets of the Company or the value of the assets being disposed of, as the case may be, determined without regard to any liabilities associated with such assets); or

(d) Individuals who, at the beginning of any consecutive twelve-month period, are members of the Board (the “Incumbent Board”) cease for any reason to constitute at least a majority of the members of the Board at any time during that consecutive twelve-month period; (provided, however, that if the appointment or election (or nomination for election) of any new Board member was approved or recommended by a majority vote of the members of the Incumbent Board then still in office, such new member shall, for purposes of this Plan, be considered as a member of the Incumbent Board).

For the avoidance of doubt, the term Change in Control shall not include a sale of assets, merger or other transaction effected exclusively for the purpose of changing the domicile of the Company. To the extent required, the determination of whether a Change of Control has occurred shall be made in accordance with Internal Revenue Code Section 409A and the regulations, notices and other guidance of general applicability issued thereunder.

ACCORDINGLY, the parties hereto have caused this Agreement to be executed on the day and year first above written.