Integer (ITGR) 10-K 2014 FY Annual report

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 333-61476, 333-97209, 333-129002, 333-143519, 333-161159, 333-174559, 333-184604 and 333-196320 on Form S-8 of our reports dated March 3, 2015, relating to the consolidated financial statements and consolidated financial statement schedule of Greatbatch, Inc. and subsidiary (the “Company”), and the effectiveness of the Company’s internal control over financial reporting, appearing in this Annual Report on Form 10-K of Greatbatch, Inc. for the year ended January 2, 2015.

/s/ Deloitte & Touche LLP

Williamsville, New York

March 3, 2015