Boston Scientific (NYSE:BSX) said today it inked a deal worth up to $300 million to acquire Apama Medical and its radiofrequency balloon catheter system designed to treat atrial fibrillation.

The deal includes an initial $175 million in cash up-front from Marlborough, Mass.-based Boston Scientific and an additional $125 million in contingent payments between 2018 and 2020 based on clinical and regulatory milestones. Boston Scientific expects the acquisition to close the 4th quarter of 2017.

Campbell, Calif.-based Apama’s novel RF balloon is a single-shot, multi-electrode device designed to combine the benefits of RF point-by-point and balloon-based ablation approaches, the company said, claiming the system delivers differentiated energy levels and shorter procedure times.

The system features an incorporated digital camera with LED lights and sensing electrodes for real-time visualization of the procedure and catheter electrode contact.

“The acquisition of Apama further advances our continued investment in the electrophysiology category, and, upon commercialization, would broaden our portfolio of differentiated arrhythmia solutions. We are also excited about the ability to integrate the Apama RF balloon system with our Rhythmia HDx mapping system to provide physicians with an unprecedented visualization of the heart during ablation procedures,” Boston Scientific rhythm management prez Joe Fitzgerald said in a prepared statement.

Results from the 1st-in-human study of the device showed the Apama RF balloon met safety and efficacy endpoints and achieved successful pulmonary vein isolation in treating paroxysmal AF patients.

“Study results reinforce the Apama RF balloon is an advancement in single-shot technology for PVI and can provide physicians with greater control and efficiency when performing AF ablations. We look forward to continuing the development and commercialization of this novel ablation solution to treat both paroxysmal and persistent AF,” Boston Scientific rhythm management and global health policy chief medical officer Dr. Kenneth Stein said in a press release.

The Apama RF balloon is currently being studied in clinical trials in Europe as the company looks to achieve CE Mark approval, which it hopes to receive in late 2018.

Boston Scientific said the acquisition is expected to be immaterial to its adjusted earnings per share for 2017 and 2018, and more dilutive on a GAAP basis due to amoritization expense, transaction and integration related costs.

Last November, Apama Medical said it raised a total of $19.7 million, with $13.2 million coming from a closed Series C round and $6.5 million from a debt facility with Silicon Valley Bank.

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