Guy's-Ross Hypothermic Bypass Machine Type 38A
Designed by Donald Ross at Guy's Hospital in 1959, using disc oxygenators and capable of cooling the blood to produce hypothermia. Cardiac Recorders Ltd of London productionised it, during 1960 under the direction of chairman Joe Spencer. About 40 were built. Two were bought for the expanding Sheffield cardio thoracic service in 1961. The Sheffield team found the performance enhanced by adding an extra oxygenator disc in parallel thereby reducing the need to cool. These machines gave sterling service for around ten years, until replaced by disposable bubble oxygenators. Pump technician Laurence Willbourne lovingly cared for this machine until his retirement, when he donated it to the museum.


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