Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: StimDust: A mm-scale implantable wireless precision neural stimulator
  with ultrasonic power and communication   Neural stimulation is a powerful technique for modulating physiological
functions and for writing information into the nervous system as part of
brain-machine interfaces. Current clinically approved neural stimulators
require batteries and are many cubic centimetres in size -- typically much
larger than their intended targets. We present a complete wireless neural
stimulation system consisting of a 1.7 mm3 wireless, batteryless, leadless
implantable stimulator (the "mote"), an ultrasonic wireless link for power and
bi-directional communication, and a hand-held external transceiver. The mote
consists of a piezoceramic transducer, an energy storage capacitor, and a
stimulator integrated circuit (IC). The IC harvests ultrasonic power with high
efficiency, decodes stimulation parameter downlink data, and generates
current-controlled stimulation pulses. Stimulation parameters are time-encoded
on the fly through the wireless link rather than being programmed and stored on
the mote, reducing power consumption and on-chip memory requirements and
enabling complex stimulation protocols with high-temporal resolution and
low-latency feedback for use in closed-loop stimulation. Uplink data indicates
whether the mote is currently stimulating; it is encoded by the mote via
backscatter modulation and is demodulated at the external transceiver. We show
that the mote operates at an acoustic intensity that is 7.8% of the FDA limit
for diagnostic ultrasound and characterize the acoustic wireless link's
robustness to expected real-world misalignment. We demonstrate the in vivo
performance of the system with motes acutely implanted with a cuff on the
sciatic nerve of anesthetized rats and show highly repeatable stimulation
across a wide range of physiological responses.

21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph