Mallinckrodt, a Covidien unit, has filed a patent-infringement lawsuit in federal court in Wilmington, Del., against two divisions of Italy's Bracco -- E-Z-EM and Acist Medical Systems -- over a device used for injecting chemicals into patients undergoing MRI. Mallinckrodt is requesting unspecified damages, a jury trial and an injunction against the two companies, according to court documents.

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