Characteristics Of The Ideal Blood Pump

Low Priming Volume

Durable/ No mechanical failures

Easy to set up and operate

No Hemolysis Or damage to the other formed elements of the

blood

AntithrombogenicNo anticoagulation required

BLOOD PUMPS

ROLLER PUMP

Roller Pumps in ECMO

Roller Pumps with Venous Reservoir dominated the US market.

Roller pumps predated Centrifugal.

Centrifugal Pumps becoming more widely used because of technology improvements.

New Centrifugal pumps have no shafts, seals or bearings.

Non Positive Displacement Centrifugal PumpFlow affected by :

Preload: CVP, Cannula/Tubing Dia, Hct

Afterload: MAP, Cannula/Tubing Dia, Hct,

Circuit Resistance

Size of pump

RPM’s

Blood Flow Monitoring for BioMedicus Pump

Pump RPM’s does not give absolute blood flow only correlates with flow.

In line Ultrasonic Flow Probe is used to monitor blood flow.

Ultra sonic Flow MeasurementFlow probe bounces ultra sound off of red cells and determines rate of flow from the Doppler shift created by the movement of the red cells. Computer converts rate of flow to volume of flow (per unit of time or mls/min). By knowing rate of flow and diameter of tubing indexed to the tubing diameter by the proper sized flow probe.