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Cards In This Set
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8 Qualities of the Ideal Blood Pump
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Able to move up to 5.0 L/min of blood
Able to pump at low velocities of flow Smooth Surfaces in contact with blood Can dismantle, clean, and sterilize with ease Blood handling components disposable Calibration easy, reliable, reproducible, Automatically controlled with option for manual operation Adjustable stroke volume and pulse rate |
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A centrifugal pump is a _________ pump.
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Kinetic
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How is pumping action performed in centrifugal pump?
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Forced rotation of an impeller adds kinetic energy to fluid
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Reasons why blood flow can be lower than normal in operating room
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Patient is asleep, given muscle relaxants.
Patient's metabolic rate is greatly reduced by cooling. |
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What causes blood to be propelled in a centrifugal pump?
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Pressure differential between the inlet and the outlet
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Describe centrifugal pumps
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Impellers arranged with vanes or cones
Magnetically driven, Produce a pressure differential as they rotate |
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How do Positive displacement pumps work?
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Moves blood forward by displacing it progressively which creates suction
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2 categories of positive displacement pump
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Rotary pumps and Reciprocating pumps
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List types of Reciprocating Pumps
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Pistons
Bar Compression Diaphragm Ventricle |
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List types of Rotary Pumps
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Roller pumps
Multiple finger pump Screw pump |
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Discuss important difference between roller and centrifugal pumps regarding occlusion.
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Roller pumps are occlusive, in the event of a power failure this would prevent the arterial line from draining a patient like a venous line. Centrifugal pumps are not occlusive.
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What pumps do we use at Cooper?
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Arterial Line- Centrifugal pump
Vent, suction and cardioplegia- roller pumps |
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In a roller pump the output is accurate because it is not dependent on ________ _________.
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The resistance of the circuit.
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Disadvantages of roller pump:
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Hemolysis if over-occluded
Tubing rupture |
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A centrifugal pump can deprime with ___________
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30 to 50 cc of air
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