Subclavian artery puncture and dilation with 9 Fr dilator during pacemaker implantation is a rare complication. We present a case, where this complication occurred and the injury was sealed with collagen-based closure device without any complications. Long term follow-up and the control angio-CT revealed no further late vascular complications. Therefore, use of a collagen based closure device for treating accidental iatrogenic subclavian artery injury can be a simple, successful alternative therapy when surgical direct vascular repair is not possible or not available.