Private Company Edition: Two companies raised multiple hundreds of millions of dollars each helping to keep the number of $100m-plus venture capital mega-rounds on the rise in May. Also, Ascend raised $132.5m to make gene and cell therapies, and Nido emerged with $109m for neurological diseases.

CSI markets minimally invasive devices to remove vascular plaques and has a full pipeline of complementary vascular intervention technologies. Abbott expects CSI’s products to complement its existing coronary intervention business and expand its presence in the peripheral market.

The firms’ partnership goes back to pre-merger Celgene, and BMS still has Dragonfly candidates in its pipeline. Ji Xing gets hypertension candidate from Phase Bio.

Johnson & Johnson plans to buy Abiomed for $380 per share – about $16.6bn in total – plus up to $35 per share in potential commercial and clinical milestone-contingent payments. Abiomed is the clear leader in percutaneous circulatory support technology, but would benefit from J&J's reach and resources while complementing J&J's Biosense Webster electrophysiology business.