<PAGE>
EXHIBIT 99.1
FORM OF PROXY
MALLINCKRODT INC.
PROXY FOR SPECIAL MEETING OF SHAREHOLDERS
ON SEPTEMBER 19, 2000
PROXY SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS
The undersigned hereby appoints C. Ray Holman, Michael A. Rocca and Roger A.
Keller and each of them, with power of substitution, as proxies at the special
meeting of shareholders of MALLINCKRODT INC. to be held on September 19, 2000,
and at any adjournment thereof, and to vote shares of stock of the company which
the undersigned would be entitled to vote if personally present.
This proxy will be voted as directed with respect to the proposal referred to in
Item 1 on the reverse side, but in the absence of such direction this proxy will
be voted FOR the proposal listed in Item 1.
------------------------------------
PLEASE VOTE, DATE AND SIGN ON REVERSE SIDE AND RETURN PROMPTLY
IN THE ENCLOSED ENVELOPE.
--------------------------------------------------------------------------------
bFOLD AND DETACH HERE, IF YOU ARE RETURNING YOUR VOTED PROXY CARD BY MAILb
SEE REVERSE
SIDE
MALLINCKRODT INC.
SPECIAL MEETING OF SHAREHOLDERS
SEPTEMBER 19, 2000
10:00 A.M. LOCAL TIME
THE ST. REGIS HOTEL
TWO EAST 55TH STREET
NEW YORK CITY, NEW YORK 10022
<PAGE>
2
<TABLE>
<S> <C> <C> <C> <C> <C> <C>
[X] PLEASE MARK VOTES 1. PROPOSAL TO ADOPT THE AGREE- FOR AGAINST ABSTAIN
AS IN THE EXAMPLE MENT AND PLAN OF MERGER, [ ] [ ] [ ]
------------------------------- DATED AS OF JUNE 28, 2000,
MALLINCKRODT INC. AMONG MALLINCKRODT, TYCO
------------------------------- ACQUISITION CORP. VI (NV)
AND EVM MERGER CORP.
</TABLE>
SIGNATURE(S)
------------------------------------------------------------------------ DATE
----------------------------, 2000
NOTE: Please read and sign exactly as name appears hereon. If shares are held
jointly or by two or more persons, each stockholder named should sign.
Executors, administrators, trustees, etc. should so indicate when signing. If
the signer is a corporation, please sign full corporate name by duly authorized
officer. If a partnership, please sign in partnership name by authorized person.
bFOLD AND DETACH HERE, IF YOU ARE RETURNING YOUR VOTED PROXY CARD BY MAILb