Cardiopulmonary bypass circuit wasn't oxygenating and the problem was eventually traced back to the blender not functioning properly.It was set to 100% oxygen with a flow over ten as was unable to deliver oxygen.An oxygen tank was brought in and was able to oxygenate when connected directly to the oxygenator.Sales rep from a company that we are contracted with to support this product were on site to test the device.They agreed device was not supplying oxygen (their sensor readings were 21%).The rep noted that one of the two screws for the dial on the control knob was loose.He tightened the screw and the device worked - delivering close to 100% o2.
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