EXHIBIT 99.1
                                                                    ------------


                               CONTINUATION SHEET

Explanation of Responses:
- -------------------------

(1)  Pursuant to a Contribution and Exchange Agreement (the "Contribution
     Agreement"), dated April 4, 2005, by and among Micro Therapeutics, Inc.
     (the "Company"), ev3 LLC, a Delaware limited liability company ("ev3 LLC"),
     ev3 Inc., a Delaware corporation and wholly owned subsidiary of ev3 LLC
     ("ev3 Inc."), Warburg, Pincus Equity Partners, L.P., a Delaware limited
     partnership (together with three affiliated entities, "WPEP"), Vertical
     Fund I, L.P., a Delaware limited partnership, and Vertical Fund II, L.P., a
     Delaware limited partnership (together with Vertical Fund I, L.P., the
     "Vertical Funds", and together with WPEP, the "Contributors"), the
     Contributors have agreed, upon the terms and subject to the conditions set
     forth in the Contribution Agreement, to contribute (the "Contribution") to
     ev3 LLC an aggregate of 9,704,819 shares of the Company's common stock, par
     value $0.001 per share (the "Common Stock"), comprised of a contribution of
     7,593,384 shares by WPEP and 2,111,435 shares by the Vertical Funds. The
     Contribution Agreement was entered into in connection with certain
     reorganization transactions relating to the proposed initial public
     offering of common stock, par value $0.01 per share, of ev3 Inc. (the
     "IPO"). Subject to the terms and conditions set forth in the Contribution
     Agreement, the Contribution will take place within two business days of the
     date on which a registration statement containing the range of estimated
     IPO prices and the ratio of reverse stock split contemplated in connection
     with the IPO is first filed by ev3 Inc. with the Securities and Exchange
     Commission. Upon the closing of the Contribution, each Contributor will
     receive a number of common membership units of ev3 LLC determined by a
     formula set forth in the Contribution Agreement. As a result of the
     execution of the Contribution Agreement, the Vertical Funds may be deemed
     to have disposed of beneficial ownership of the 2,111,435 shares of the
     Common Stock to be contributed to ev3 LLC by the Vertical Funds.

(2)  The reporting person, a director of the Company, is a general partner of
     The Vertical Group, L.P., a Delaware limited partnership, the sole general
     partner of each of the Vertical Funds. Each of the Vertical Funds are
     members of ev3 LLC, a Delaware limited liability company, which wholly owns
     Micro Investment, LLC, a Delaware limited liability company. The reporting
     person disclaims beneficial ownership of all shares of the Common Stock
     beneficially owned by the Vertical Funds, except to the extent of any
     indirect pecuniary interest therein.