Endoscopic radial artery harvesting in coronary bypass surgery is routinely performed by the
investigators. In this study, the investigators want to compare the MiFusion TLS2 (Endotrust
GmbH, Germany) device to the LigaSure Maryland Jaw (Medtronic, USA). The vessel harvesting is
performed in the standard fashion according to the institutional routine. The patients are
randomized preoperatively to one of the devices. The proximal end of the radial artery will
be preserved and deep-frozen for histological assessment. Endothelial integrity will be
investigated using Hematoxylin-Eosin, CD31 and endothelial nitrogen monoxide synthase.