Abstract: External inlet and outlet pinch-type plate valves for controlling the blood flow through a compressible shunt of a cardiopulmonary bypass pump wherein the valves are not fixedly connected to the compression chamber or housing of the pump so that the distance between the inlet and outlet valves can be adjusted to thereby allow adjustment of stroke volume to fit the needs of the patient being treated.
Abstract: To decrease hemolysis and reduce the cost of single use disposable tubing used during surgery, valve elements pivotally suspended in the bypass pump compression chamber respond to gravity and variations in fluid pressure within the shunt and act entirely on the exterior of the shunt to cyclically control blood flow therethrough. Interior valves for the shunt tubing are entirely eliminated.
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