<p>The left ventricle valve (10) includes a unidirectional check valve (42) having duckbill valve portion (44) and a flange portion (46) to movably cover vacuum vent openings (28). The vacuum vent openings are parallel to the flow passage (20) of the left ventricle valve. The valve also has a pressure relief opening (30) and (32). The valve is used in an extra-corporeal circuit for draining the left ventricle of the heart.</p>
