Comparison of Centrifugal and Roller Pump Hemolysis Rates at Low Flow

Area of Science:

• Biomedical Engineering
• Cardiovascular Devices
• Neonatal Critical Care

Background:

• Neonatal extracorporeal membrane oxygenation (ECMO) requires specialized pumps to manage blood flow.
• Conventional roller pumps are widely used but may cause significant hemolysis.
• A novel centrifugal pump has been developed for potential ECMO applications.

Purpose of the Study:

• To compare the in vitro hemolysis rates of a new centrifugal pump against a conventional roller pump.
• To evaluate pump performance under simulated neonatal ECMO conditions (low flow, high pressure).
• To assess the potential benefits of the centrifugal pump for neonatal ECMO systems.

Main Methods:

• In vitro comparison of hemolysis rates between a centrifugal pump and a Stöckert roller pump.
• Simulated neonatal ECMO conditions using flow rates of 0.3 L/min and 1 L/min at 200 mm Hg pressure.
• Statistical analysis to determine significant differences in hemolysis rates.

Main Results:

• No significant difference in hemolysis rates was observed between the centrifugal and roller pumps (p = 0.57).
• Hemolysis rates did not differ significantly between high and low flow conditions (p = 0.86).
• The centrifugal pump demonstrated comparable blood trauma to the roller pump under simulated neonatal ECMO conditions.

Conclusions:

• The tested centrifugal pump is suitable for neonatal ECMO, exhibiting no increased hemolysis compared to roller pumps.
• The centrifugal pump's smaller size and reduced priming volume (25 ml) offer advantages for developing more compact ECMO systems.
• This centrifugal pump may facilitate the creation of simpler and potentially more effective neonatal ECMO setups.