MAZZILLI
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This presentation describes an ultrasound system for wireless energy transfer dedicated to implanted medical devices. It discusses the motivations, specifications, and system architecture of an ultrasound link for remotely powering implanted devices. Key aspects covered include frequency selection, transducer design, modeling of pressure fields, selection of rechargeable batteries, design of class-E power amplifiers, integrated rectifier topologies, and measurements of system efficiency both in simulation and in vitro experiments comparing discrete and integrated approaches. The overall aim is to develop an ultrasound-based system for long-term powering of implanted medical devices as an alternative to inductive coupling.
![Slide 8
• To overcome electromagnetic attenuation
limit in water:
• Robustness towards jamming.
Attenuation @ 10-20 cm
ACOUSTIC 8-16 dB (@ 1 MHz)[1]
MAGNETIC 50 dB (@ 1 MHz)[2]
RF 60-90 dB (@ 2.45 GHz)[2]
[1] Francis A. Duck., Physical Properties of Tissue, 1990.
[2] Tomohiro Yamada et al., JJAP, 44(7A), 2005.
[3] Mazzilli et al., EMBC, 2010.
2 WHY ULTRASOUND? (3/4)](https://image.slidesharecdn.com/015a5ee5-f69d-4dd8-823a-74dcd989c0ac-151203093341-lva1-app6891/85/MAZZILLI-8-320.jpg)
![Slide 9
[4] A. Denisov, International Conference on Body Sensor Networks, 2010.
2 Inductive vs. Ultrasound: WET[4] (4/4)](https://image.slidesharecdn.com/015a5ee5-f69d-4dd8-823a-74dcd989c0ac-151203093341-lva1-app6891/85/MAZZILLI-9-320.jpg)
![Slide 28
4.3 Power Amplifier measurement (2/3)
[5] Mazzilli et al. Circuits and Systems (ISCAS), 2012.](https://image.slidesharecdn.com/015a5ee5-f69d-4dd8-823a-74dcd989c0ac-151203093341-lva1-app6891/85/MAZZILLI-28-320.jpg)
![Slide 34
4.6 Measurement results (3/7)
[6] Mazzilli et al., RFIC Symposium, 2010.](https://image.slidesharecdn.com/015a5ee5-f69d-4dd8-823a-74dcd989c0ac-151203093341-lva1-app6891/85/MAZZILLI-34-320.jpg)
![Slide 42
5 Link efficiency: benchmarking (4/4)
ultrasound
inductive
[7] Mazzilli et al., Transaction on Biomedical Circuits and Systems, 2014.](https://image.slidesharecdn.com/015a5ee5-f69d-4dd8-823a-74dcd989c0ac-151203093341-lva1-app6891/85/MAZZILLI-42-320.jpg)
MAZZILLI
- 1. An Ultrasound System for Wireless Energy Transfer dedicated to Implanted Medical Devices Francesco Mazzilli Analog Design Engineer, PhD
- 2. Slide 2 Outline 1. Terminology 2. Introduction 3. Specifications 4. System architecture 5. Ultrasound link for remote powering 6. Conclusion
- 3. Slide 3 1 Ultrasound in Medicine: Overview (1/3) Therapeutic Diagnostic
- 4. Slide 4 1 Wireless Energy Transfer (2/3)
- 5. Slide 5 1 Implanted Medical Devices (3/3)
- 6. Slide 6 2 Motivations (1/4) ultrasponder.org
- 7. Slide 7 2 System Overview (2/4)
- 8. Slide 8 • To overcome electromagnetic attenuation limit in water: • Robustness towards jamming. Attenuation @ 10-20 cm ACOUSTIC 8-16 dB (@ 1 MHz)[1] MAGNETIC 50 dB (@ 1 MHz)[2] RF 60-90 dB (@ 2.45 GHz)[2] [1] Francis A. Duck., Physical Properties of Tissue, 1990. [2] Tomohiro Yamada et al., JJAP, 44(7A), 2005. [3] Mazzilli et al., EMBC, 2010. 2 WHY ULTRASOUND? (3/4)
- 9. Slide 9 [4] A. Denisov, International Conference on Body Sensor Networks, 2010. 2 Inductive vs. Ultrasound: WET[4] (4/4)
- 11. Slide 11 • Physical limitations 1. attenuation; 2. transducers; 3. pressure field distribution. 3.2 Frequency selection f0 (1/8) • Accepted standard 1. mechanical index;
- 12. Slide 12 9.1 1 1 0 3, MPa MHz f p MI r 3.2 Mechanical Index (2/8)
- 13. Slide 13 )exp( )( 0 0 fz p zp attenuation 0.3 dB/cm/MHz distance acoustic normalized pressure 3.2 Attenuation (3/8)
- 14. Slide 14 3.2 Transducer: Control Unit (4/8) Transducer manufactured by IMASONIC
- 15. Slide 15 3.2 Numerical Modeling using FOCUS (5/8)
- 16. Slide 16 3.2 Pressure field analysis (6/8)
- 17. Slide 17 3.2 Which frequency? (7/8) 1MHZ
- 18. Slide 18 3.2 Pressure field comparison (8/8) 1MHZ
- 19. Slide 19 3.3 Transducer: Implanted Node (1/5) Transducer manufactured by IMASONIC
- 20. Slide 20 3.3 Equivalent circuit (2/5) INPUT
- 21. Slide 21 3.3 Measurement set-up (3/5) 1 MHz designed by F. Mazzilli and V. Praplan
- 22. Slide 22 3.3 Equivalent circuit (4/5) narrow band model valid at f0
- 23. Slide 23 3.3 Measurement results (5/5)
- 24. Slide 24 Long Term Implant (longevity) Implant Size Long Autonomy Rechargeable Battery (# recharge cycles) Battery Energy Density (Wh / liter) # batteries (primary + secondary) Battery Size 3.4 Which battery? (1/2)
- 25. Slide 25 3.4 Infinite Power Solutions (IPS) battery (2/2)
- 26. Slide 26 4.1 System architecture efficiency hPA
- 27. Slide 27 4.2 Class-E Power Amplifier (1/3)
- 28. Slide 28 4.3 Power Amplifier measurement (2/3) [5] Mazzilli et al. Circuits and Systems (ISCAS), 2012.
- 29. Slide 29 4.3 Power Amplifier measurement (3/3) unfocused field focused field Vcc=3V
- 30. Slide 30 4.4 System architecture integrated circuit discrete efficiency hrec
- 31. Slide 31 4.5 Discrete rectifier
- 32. Slide 32 4.6 Integrated rectifiers: topologies (1/7)
- 33. Slide 33 4.6 Topologies integration (2/7) • standard 0.18 mm UMC CMOS technology. • W/L = 250 mm/0.5 mm • Cout = 5 pF
- 34. Slide 34 4.6 Measurement results (3/7) [6] Mazzilli et al., RFIC Symposium, 2010.
- 35. Slide 35 4.6 Integrated rectifier: block diagram (4/7)
- 36. Slide 36 4.6 Integrated rectifier: schematic (5/7)
- 37. Slide 37 4.6 Active body control (6/7)
- 38. Slide 38 4.6 Synchronous rectifier: efficiency (7/7)
- 39. Slide 39 recUSPAlink hhhh ccccload rec link iVR V 12 h 5 System efficiency (1/4)
- 40. Slide 40 5 In-vitro measurements (2/4) - in-vitro set-up designed by F. Mazzilli and G. Corradini (EPFL) - Phantom material realized by J.-M. Mari (INSERM)
- 41. Slide 41 5 System efficiency comparison (3/4) discrete integrated
- 42. Slide 42 5 Link efficiency: benchmarking (4/4) ultrasound inductive [7] Mazzilli et al., Transaction on Biomedical Circuits and Systems, 2014.
- 43. Slide 43 6 Conclusion Thanks ! & Questions!
- 44. Slide 44 Partners & Acknowledgement - Catherine Dehollain - Michela Peisino - Roger Receveur - Giancarlo Corradini - Jean-Martial Mari - Cyril Lafon - Michael Green - European Commission
Editor's Notes
- #35: ADDING IMAGE