WILMINGTON, Del. (AP) — A federal judge in Delaware has ruled that certain heart pacemakers sold by Medtronic Inc. do not infringe patents claimed by rival medical device manufacturer Boston Scientific Corp.

Ruling in a long-running dispute between the two companies, the judge granted a request by Minneapolis-based Medtronic for a ruling that certain implantable heart stimulators it makes do not infringe Boston Scientific patents.

READ MORE: Shoplifter Shoots St. Paul Liquor Store Worker Twice, Police Say

But at the same time, the judge denied Medtronic’s request for a declaration that the patents claimed by Massachusetts-based Boston Scientific are invalid and unenforceable.

READ MORE: Minnesota Weather: Next Dose Of Snow Could Make For Commute Headaches

The patents involve specialized pacemakers capable of stimulating both ventricles of the heart to help increase its ability to pump blood.

MORE NEWS: Archambault Lifts Coyotes Over Tommies 90-79

(© Copyright 2011 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)