Boston Scientific Corp. (NYSE: BSX) has acquired another developer of catheter technology.

The Natick, Mass.-based medical device manufacturer has agreed to buy Vessix Vascular Inc. for an up-front price of $125 million, nearly one month after it spent $265 million for Rhythmia Medical Inc.

Boston Scientific said it will pay an additional $300 million should the Laguna Hills, Calif. target meet clinical and sales-based milestones.

Vessix, which makes devices to help treat hypertension, has raised venture capital from various firms, including Christopher Weil & Co., Edmond de Rothschild Investment Partners, Fjord Invest, NeoMed Management and OrbiMed Advisors LLC. 

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