Venture capital firms Volcano Capital, Crocker Capital and Aphelion Capital co-led the deal, and were joined by peer Windy City.

Mercator MedSystems, a US-based developer of catheter-guided microfluid injection systems spun out of the University of California, Berkeley, has raised $6.5m in its series B round from a consortium including advisory group Set Technology.

Venture capital firms Volcano Capital, Crocker Capital and Aphelion Capital co-led the deal, and were joined by peer Windy City.

In 2006 and 2007, Mercator was raising up to $900,000 in its initial round with law firm White & Case as a director.