57HeartWare™ HVAD™ System Pump
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Appendix
Reference
Guides
Alarms and
Emergencies
Patient
Management
Surgical
Implant and
Explant
Monitor
Peripherals
and
Accessories
HVAD
®
PumpOverviewIntroduction
3.1 Principles of Operation
Background
The HVAD
®
a rotating impeller that adds energy to the blood by
converting the rotational kinetic energy into mechanical
energy (Figure 33)
the pump using hydrodynamic and centrifugal forces.
referred to as pump head (i.e., related to the differential
pressure across the device) or just head, such that the
Pump head is the difference between the afterload and
the preload. Energy to rotate the impeller is provided
through electromagnetic coupling between permanent
magnets (rotor magnet) attached or enclosed within
the impeller and the motor stators. The motor stators
consist of coils of wire that are sequentially charged by
electrical current, turning the coils into electromagnets.
These electromagnets have the effect of spinning the
rotor magnets around an axis of rotation. The HVAD
®
blood against moderate amounts of resistance.
3.1 Principles of
Operation
....................57
3.2 Physiologic Control
Algorithms
..................59
3.2.1 Flow Estimation .........59
3.2.2 [Ventricular Suction
Detection] Alarm
........ 60
3.3 HVAD
®
Pump Operating
Guidelines
................... 63
3.4 Expected Useful Life
of the HVAD
®
Pump ....63
3.5 Device Tracking
and Reporting
Requirements
.............63
3.0 HeartWare
™
HVAD
™
System Pump
Figure 33: Open View
of HVAD
®
Pump
1.
2. Impeller
3. Center Post
1
2
3
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