| 摘要 |
A control system is provided for controlling blood gas values in blood processed by an oxygenator. The oxygenator generates arterial blood by exposing venous blood to oxygen from an oxygenation gas supply. A monitoring arrangement determines the blood gas values in the arterial blood and a controller responsive to the monitoring arrangement controls parameters of the oxygenation gas supplied to the oxygenator. This allows the blood gas values to be adjusted toward a pre-determined level. The oxygen supply may be altered via the flow rate or gas composition. The monitoring arrangement may continuously monitor the blood using non-contact methods. It may monitor the oxygen and carbon dioxide in the inlet gases, exhaust gases, and venous and arterial blood, in order to calculate the oxygen uptake and hence an expected blood gas level; it may also calculate a difference between the expected and actual blood gas levels and thus apply an offset to the change in gas supply to take into account oxygenator efficiency (see figure 1). |
