Acutus Medical Inc., a San Diego developer of heart imaging devices, announced it has completed a $21 million round in Series B funding.

The round was led by a new investor, New York-based global investment firm OrbiMed Advisors LLC, with additional participation from existing investors. Acutus Medical said proceeds will go primarily toward research and development, including clinical studies. It focuses mainly on developing a method to track irregular heartbeats in patients, called aberrant arrhythmia.

Privately held Acutus Medical was founded in 2011 and additionally backed by venture investment from two London-based firms — Index Ventures and Advent Ventures.

— Meghana Keshavan