free-range resonant electrical energy delivery system (free-d) for
TRANSCRIPT
Free-range Resonant Electrical Energy Delivery System (FREE-D)
for a Ventricular Assist Device
Ben Waters (MS EE), Alanson Sample (PhD EE)
Joshua Smith (PhD EE), Pramod Bonde (MD)
University of Washington
Yale School of Medicine
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Disclosure • I have no actual or potential conflict of interest.
2/11/2012 2 STS 48th Annual Meeting
Problems with LVADs and Drivelines • LVADs proven efficacious
– REMATCH, Rose et al
– NEJM 2001
– INTERMACS
• Transcutaneous Drivelines
– Infection
– Repeated hospitalizations
– Surgical interventions
– Reduced quality of life
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Wireless Power
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Previous Inductive Coupling Systems • Technology
– Inductive coupling
– “Point” charging
• Limitations
– Distance
– Misalignment
• Previous LVAD Applications
– TETS
– LionHeart
– Abiocor
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LionHeart, El-Banayosy et al
PowerMat Charging Pad
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FREE-D System
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• Technology
– Resonant coupling
– High Q resonators
– “Volume” charging
• Benefits
– Efficiency
– Adaptation
– Distance
– Orientation
– Safety
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FREE-D System Demonstration
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Safety and Regulations • EM Exposure
– Specific absorption rate (SAR)
• Thermal Energy
– RF energy radiation
– Electronics temperature
• Electrical Regulations
– Frequency bandwidth
– Field strength of emissions
• Efficiency is important!
– Transmitted power
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IT’IS SAR Simulations • Coil Alignments
– Coronal
– Axial
– Sagittal
• SAR Levels
– Measurements for coil
aligned at 10mm and
75mm from body.
– Worst case SAR for
coronal alignment
– Peak SAR limitations
reached at 45-280W
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Implementation
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Methods
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Power Delivery to LVAD
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Ou
tpu
t P
ow
er
(wat
ts)
Time (hours)
Continuous Power Delivered
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Conclusion Conclusion from Abstract
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