NxStage Medical, Inc. - FORM 10-Q/A - EX-31.1 - EX-31.1 SECTION 302 CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER - October 19, 2009

Attached files

file	filename
10-Q/A - NXSTAGE MEDICAL, INC. - NxStage Medical, Inc.	b77706e10vqza.htm
EX-31.2 - EX-31.2 SECTION 302 CERTIFICATION OF THE CHIEF FINANCIAL OFFICER - NxStage Medical, Inc.	b77706exv31w2.htm
EX-32.2 - EX-32.2 SECTION 906 CERTIFICATION OF THE CHIEF FINANCIAL OFFICER - NxStage Medical, Inc.	b77706exv32w2.htm
EX-32.1 - EX-32.1 SECTION 906 CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER - NxStage Medical, Inc.	b77706exv32w1.htm
EX-10.45 - EX-10.45 SUPPLY AGREEMENT WITH LABORATORIES PISA DATED APRIL 10, 2009 - NxStage Medical, Inc.	b77706exv10w45.htm

EXHIBIT 31.1
CERTIFICATION PURSUANT TO RULE 13A-14(A)/15D-14(A),
AS ADOPTED PURSUANT TO
SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Jeffrey H. Burbank, certify that:

1.		I have reviewed this Quarterly Report on Form 10-Q of NxStage Medical, Inc. for the period ended June 30, 2009 (this “report”);

2.		Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;


/s/ Jeffrey H. Burbank
Jeffrey H. Burbank
President and Chief Executive Officer

Date: October 19, 2009