An industry whistle-blower filed lawsuits against Boston Scientific, Medtronic, St. Jude Medical and four other medical-device makers, alleging they marketed their surgical ablation devices for off-label uses, according to a federal judge in Houston. Spokesmen for Medtronic and St. Jude Medical said the companies will defend themselves against the claims in court. A spokesman for Boston Scientific declined to comment on the issue.

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