free-range resonant electrical energy delivery system (free-d) for
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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
2/11/2012 1 STS 48th Annual Meeting
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
2/11/2012 3 STS 48th Annual Meeting
Wireless Power
2/11/2012 4 STS 48th Annual Meeting
Previous Inductive Coupling Systems • Technology
– Inductive coupling
– “Point” charging
• Limitations
– Distance
– Misalignment
• Previous LVAD Applications
– TETS
– LionHeart
– Abiocor
2/11/2012 5
LionHeart, El-Banayosy et al
PowerMat Charging Pad
STS 48th Annual Meeting
FREE-D System
2/11/2012 6
• Technology
– Resonant coupling
– High Q resonators
– “Volume” charging
• Benefits
– Efficiency
– Adaptation
– Distance
– Orientation
– Safety
STS 48th Annual Meeting
FREE-D System Demonstration
2/11/2012 7
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
2/11/2012 8 STS 48th Annual Meeting
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
2/11/2012 9 Christ et al, IEEE, 2009
Implementation
2/11/2012 10 STS 48th Annual Meeting
Methods
2/11/2012 11
Power Delivery to LVAD
2/11/2012 12
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0 1 2 3 4 5 6 7 8
Ou
tpu
t P
ow
er
(wat
ts)
Time (hours)
Continuous Power Delivered
STS 48th Annual Meeting
Conclusion Conclusion from Abstract
2/11/2012 13 STS 48th Annual Meeting
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