Laguna Hills-based Vessix Vascular Inc. will be acquired by Boston Scientific Corp. for $125 million in cash, with additional payments of up to $300 million possible based on future milestones.

Vessix makes a catheter-based device to treat uncontrolled hypertension, or high blood pressure.

Natick, Mass.-based Boston Scientific said that Vessix will strengthen its hypertension device portfolio. Vessix’s device has European and Australian regulatory approval and is planning to introduce it in Europe in 2013.

Boston Scientific has been busy in Orange County this year.

It bought heart defibrillator maker Cameron Health Inc. of San Clemente in a deal that could be worth more than $1 billion based on milestones in March.