Deltex Medical Group PLC is a British manufacturer of Fluid Management devices, which include the ODM and now ODM+ haemodynamic monitoring systems. It has developed theĀ gold standard for haemodynamic monitoring with its oesophageal Doppler technology, which is marketed as TrueVue Doppler and often generically referred to by clinicians as ODM. The company's initial and principal technology is Doppler-based ultrasound oesophageal haemodynamic monitoring. This technology generates accurate, real-time data on descending aortic blood flow velocity in anesthetised or sedated patients.