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Exhibit 3.1 ARTICLES OF AMENDMENT
TO
AMENDED AND RESTATED ARTICLES OF INCORPORATION
OF
DIAMETRICS MEDICAL, INC. 1. The name of the corporation is Diametrics Medical, Inc. 2. The following is the full and complete text of the first paragraph of Article 3 of the Amended
and Restated Articles of Incorporation of Diametrics Medical, Inc., as amended: The total number of shares of capital stock which the corporation is authorized to issue
shall be 1,005,000,000 shares, consisting of 1,000,000,000 shares of common stock, par value $.01
per share (Common Stock), and 5,000,000 shares of preferred stock, par value $.01 per share
(Preferred Stock). 3. The foregoing amendment has been adopted pursuant to Chapter 302A of the Minnesota Business
Corporation Act. IN WITNESS WHEREOF, the undersigned, the Secretary of Diametrics Medical, Inc., being duly
authorized on behalf of Diametrics Medical, Inc., has executed this document on this 18th of March,
2005. /s/ W. Glen WinchellSenior Vice President of Finance andChief Financial Officer




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AMENDED AND RESTATED ARTICLES OF INCORPORATION
OF
DIAMETRICS MEDICAL, INC.
(as amended March 18, 2005) ARTICLE 1. NAME The name of the corporation is Diametrics Medical, Inc. ARTICLE 2. REGISTERED OFFICE The address of the registered office of the corporation is 2658 Patton Road, Roseville, Minnesota 55113. ARTICLE 3. AUTHORIZED SHARES 1. Authorized Shares. The total number of shares of capital stock which the corporation is authorized to issue shall be
1,005,000,000 shares, consisting of 1,000,000,000 shares of common stock, par value $.01 per share
(Common Stock), and 5,000,000 shares of preferred stock, par value $.01 per share (Preferred
Stock). 2. Common Stock. All shares of Common stock shall be voting shares and shall be entitled to one vote per share.
Holders of Common Stock shall not be entitled to cumulate their votes in the election of directors
and shall not be entitled to any preemptive rights to acquire shares of any class or series of
capital stock of the corporation. Subject to any preferential rights of holders of Preferred
Stock, holders of Common Stock shall be entitled to receive their pro rata share, based upon the
number of shares of Common Stock held by them, of such dividends or other distributions as may be
declared by the board of directors from time to time and of any distribution of the assets of the
corporation upon its liquidation, dissolution or winding up, whether voluntary or involuntary. 3. Preferred Stock. The board of directors of the corporation is hereby authorized to provide, by resolution or
resolutions adopted by such board, for the issuance of Preferred Stock from time to time in one or
more classes and/or series, to establish the designation and number of shares of each such class or
series, and to fix the relative rights and preferences of the shares of each such class or series,
all to the full extent permitted by the Minnesota Business Corporation Act, Section 302A.401, or
any successor provision. Without limiting the generality of the foregoing, the board of directors
is authorized to provide that shares of a class or series of Preferred Stock: (a) are entitled to cumulative, partially cumulative or noncumulative dividends or other
distributions payable in cash, capital stock or indebtedness of the corporation or other
property, at such times and in such amounts as are set forth in the board resolutions
establishing such class or series or as are determined in a manner specified in such
resolutions; (b) are entitled to a preference with respect to payment of dividends over one or more
other classes and/or series of capital stock of the corporation; (c) are entitled to a preference with respect to any distribution of assets of the
corporation upon its liquidation, dissolution or winding up over one or more other classes
and/or series of capital stock of the corporation in such amount as is set
forth in the board
resolutions
establishing such class or series or as is determined in a manner specified in
such
resolutions;




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(d) are redeemable or exchangeable at the option of the corporation and/or on a mandatory
basis for cash, capital stock or indebtedness of the corporation or other property, at such
times or upon the occurrence of such events, and at such prices, as are set forth in the
board resolutions establishing such class or series or as are determined in a manner
specified in such resolutions; (e) are entitled to the benefits of such sinking fund, if any, as is required to be
established by the corporation for the redemption and/or purchase of such shares by the
board resolutions establishing such class or series; (f) are convertible at the option of the holders thereof into shares of any other class or
series of capital stock of the corporation, at such times or upon the occurrence of such
events, and upon such terms, as are set forth in the board resolutions establishing such
class or series or as are determined in a manner specified in such resolutions; (g) are exchangeable at the option of the holders thereof for cash, capital stock or
indebtedness of the corporation or other property, at such times or upon the occurrence of
such events, and at such prices, as are set forth in the board resolutions establishing
such class or series or as are determined in a manner specified in such resolutions; (h) are entitled to such voting rights, if any, as are specified in the board resolutions
establishing such class or series (including, without limiting the generality of the
foregoing, the right to elect one or more directors voting alone as a single class or
series or together with one or more other classes and/or series of Preferred Stock, if so
specified by such board resolutions) at all times or upon the occurrence of specified
events; and (i) are subject to restrictions on the issuance of additional shares of Preferred Stock of
such class or series or of any other class or series, or on the reissuance of shares of
Preferred Stock of such class or series or of any other class or series, or on increases or
decreases in the number of authorized shares of Preferred Stock of such class or series or
of any other class or series. Without limiting the generality of the foregoing authorizations, any of the rights and preferences
of a class or series of Preferred Stock may be made dependent upon facts ascertainable outside the
board resolutions establishing such class or series, and may incorporate by reference some or all
of the terms of any agreements, contracts or other arrangements entered into by the corporation in
connection with the issuance of such class or series, all to the full extent permitted by the
Minnesota Business Corporation Act. Unless otherwise specified in the board resolutions
establishing a class or series of Preferred Stock, holders of a class or series of Preferred Stock
shall not be entitled to cumulate their votes in any election of directors in which they are
entitled to vote and shall not be entitled to any preemptive rights to acquire shares of any class
or series of capital stock of the corporation. ARTICLE 4. NO CUMULATIVE VOTING There shall be no cumulative voting by the shareholders of the corporation. ARTICLE 5. NO PREEMPTIVE RIGHTS The shareholders of the corporation shall not have any preemptive rights to subscribe for or
acquire securities or rights to purchase securities of any class, kind or series of the
corporation.




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ARTICLE 6. WRITTEN ACTION BY DIRECTORS An action required or permitted to be taken at a meeting of the board of directors of the
corporation may be taken by a written action signed, or counterparts of a written action signed in
the aggregate, by all of the directors unless the action need not be approved by the shareholders
of the corporation, in which case the action may be taken by a written action signed, or
counterparts of a written action signed in the aggregate, by the number of directors that would be
required to take the same action at a meeting of the board of directors of the corporation at which
all of the directors were present. ARTICLE 7. DIRECTOR LIABILITY To the fullest extent permitted by the Minnesota Business Corporation Act as the same exists
or may hereafter be amended, a director of this corporation shall not be liable to this corporation
or its shareholders for monetary damages for breach of fiduciary duty as a director. ARTICLE 8. The Board of Directors shall have the power, to the extent permitted by law, to adopt, amend
or repeal the Bylaws of this corporation, subject to the power of the shareholders to adopt, amend
or repeal such Bylaws. Bylaws fixing the number of directors or their classifications,
qualifications or terms of office, or prescribing procedures for removing directors or filling
vacancies in the Board may be adopted, amended or repealed only by the affirmative vote of the
holders of 80% of the outstanding shares of Common Stock entitled to vote. The number of directors shall be no less than three nor more than twenty and shall be
established by resolution of the Board of Directors. The number of directors may be increased or
decreased from time to time by a resolution adopted by the holders of at least 80% of the
outstanding shares of Common Stock entitled to vote. In case of any increase or decrease in the
number of directors, the increase or decrease shall be distributed among the several classes of
directors as equally as possible as shall be determined by the Board of Directors or by the holders
of at least 80% of the outstanding shares of Common Stock entitled to vote. The affirmative vote
of shareholders holding at least 80% of the outstanding shares of Common Stock entitled to vote at
an election of directors may remove any or all of the directors from office at any time, with or
without cause. Notwithstanding any other provisions of these Restated Articles of Incorporation or the Bylaws
of the corporation or the fact that a lesser percentage may be specified by law, these Restated
Articles of Incorporation or the Bylaws of the corporation, the affirmative vote of the holders of
at least 80% of outstanding shares of Common Stock entitled to vote shall be required to amend or
repeal all or any portion of this Article 8; provided, however, that if the Continuing Directors
shall by majority vote of all Continuing Directors have adopted a resolution approving the
amendment or repeal proposal and have determined to recommend it for approval by the holders of
Common Stock, then the vote required shall be the affirmative vote of the holders of at least a
majority of the outstanding Common Stock entitled to vote. The term Common Stock shall mean the Common Stock, par value $.01 per share, of the
corporation. The term Continuing Director shall mean any member of the Board of Directors of the
corporation who is unaffiliated with a Controlling Person and was a member of the Board prior to
the time that the Controlling Person became a Controlling Person, and any successor of a Continuing
Director who is unaffiliated with a Controlling Person and is recommended or elected to succeed a
Continuing Director by a majority of all Continuing Directors. The term Controlling Person shall mean any Person who beneficially owns a number of shares
of Common Stock, whether or not such number includes shares not then issued, which exceeds a number
equal to ten percent of the outstanding shares of Common Stock. The term Person shall mean an individual, a corporation, a partnership, an association, a
joint-stock company, a trust, any unincorporated organization and any other entity or group.