Massachusetts-based Boston Scientific Corp. will acquire Laguna Hills-based Vessix Vascular Inc. for $125 million in cash, with possible additional milestone payments of up to $300 million.

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

Boston Scientific said that Vessix will strengthen its hypertension device portfolio. Vessix’s device has European and Australian regulatory approval and is scheduled for European introduction in 2013.

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

Vita Reed