UPDATE 1-Study finds flaws in criticism of St. Jude cyber security

(Adds comment from Muddy Waters)

By Ransdell Pierson

Aug 30 (Reuters) - University of Michigan researchers on

Tuesday said their own experiments undermine recent allegations

of security flaws in St. Jude Medical Inc's pacemakers

and other implantable medical devices.

Shares of St. Jude fell 5 percent on Thursday after

short-selling firm Muddy Waters and its business partner, cyber

security company MedSec Holdings Inc, alleged finding

significant security bugs in the company's Merl

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