An apparatus for performing myocardial revascularization in a beating heart and left ventricular assistance condition comprises an arterial cannula, of a per se known type, arranged in the descending aorta, a novel arterial draining cannula, of a two cannula stage type, so arranged that the draining occurs from the left auricle and left ventricle, and a centrifugal pump allowing blood flow from the left ventricle to the aorta. The apparatus allow the patients to be operated on with the safety of a conventional extra-corporeal circulation and with a risk and cost reduction due to the off-pump technique.
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