CryoTherapeutics, a Germany-based system developer of treatments for coronary artery disease, has raised €3.5m ($4.9m) in an extension of its series A round that was led by venture capital firm Peppermint Venture Partners via its Charité Biomedical Fund.

The second tranche also included participation from German development bank KfW. CryoTherapeutics secured €3m ($4.2m) in the first tranche, in March 2013, from German corporate-backed venture fund High-Tech Gruenderfonds (HTGF), North Rhine-Westphalia bank, private investor Rainer Christine, and Getz Brothers.

HTGF, which…