<p>Implantable wireless devices
are used to treat a variety of diseases that are not able to be treated
with pharmaceuticals or traditional surgery, These implantable devices have use
in the treatment of neurological disorders like epilepsy, optical disorders
such as glaucoma, or injury related issues such as targeted muscle
reinnervation. These devices can rely upon harvesting power from an inductive
wireless power source and batteries. Improvements to how well the devices
utilize this power directly increase the efficacy of the device operation as
well as the device's lifetime, reducing the need for future surgeries or
implantations. </p>
<p> I have
designed an improvement to cavity resonator based wireless power by designing a
dynamic impedance matching implantable power supply, capable of tracking with
device motion throughout a changing magnetic field and tracking with changing
powering frequencies. This cavity resonator based system presents further
challenges practically in the turn-on cycle of the improved device. </p>
<p> I further
design a coil-to-coil based wireless power system, capable of dynamically
impedance matching a high quality factor coil to optimize power transfer during
steady state, while also reducing turn-on transient power required in dynamic
systems by utilizing a second low quality factor coil. This second coil has a
broadband response and is capable of turning on at lower powers than that of
the high quality factor coil. The low quality factor coil powers the circuitry
that dynamically matches the impedance of the high quality factor coil,
allowing for low power turn on while maintaining high power transfer at all
operating frequencies to the implantable device. </p>
<p> Finally, an
integrated circuit is designed, fabricated, and tested that is capable of
smoothly providing regulated DC power to the implantable device by stepping up
from wireless power to a reasonable voltage level or stepping down from a
battery to a reasonable voltage level for the device. The chip is fabricated in
0.18um CMOS process and is capable of providing power to the "Bionode" implantable
device. </p>
| Identifer | oai:union.ndltd.org:purdue.edu/oai:figshare.com:article/13362884 |
| Date | 14 December 2020 |
| Creators | Christopher J Quinkert (9755558) |
| Source Sets | Purdue University |
| Detected Language | English |
| Type | Text, Thesis |
| Rights | CC BY-NC-SA 4.0 |
| Relation | https://figshare.com/articles/thesis/Practical_And_Reliable_Wireless_Power_Supply_Design_For_Low_Power_Implantable_Medical_Devices/13362884 |
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