category » Medical Electronics

Figure 1: Electrical double-layer transistor (EDLT) implemented using monolayer MoS2. MoS2 can be grown on a variety of substrates through chemical vapor deposition using S8 and MoO3 at 650°C. MoS2 channel regions are isolated via oxygen plasma etch. Ti/Au source-drain contacts are subsequently deposited using electron beam evaporation.
Flexible High-Density MoS2 Sensor Arrays for Monitoring Action Potentials
  • Monolayer MoS2, a transition metal dichalcogenide, is a novel flexible semiconducting material with a 1.8 eV direct band gap.  Recent…


Figure 1: WCE pills (PillCam SB and PillCam ESO) from Given Imaging, Inc. The pill contains small cameras, electronics, a radio and batteries.
An Ingestible Pill for Ultrasound Imaging of Small Intestine
  • The small intestine is one of the most difficult organs to image because of its length and narrow winding path….


Cathode for X-ray Generation with Arrays of Individually Addressable Field Emitters Controlled by Vertical Ungated FETs
  • This work focuses on the design and fabrication of a cathode for a portable X-ray source. The cathode is made…


Electro-chemical Stimulation of Neuromuscular Systems Using Ion-selective Membranes
  • Spinal cord injury (SCI) leads to paralysis, decrease in quality of life, and high lifetime medical costs. Direct nerve functional…


Figure 1: The wearable, long-term cardiac monitor is attached to the chest with conventional 3M electrodes. In this configuration, the cardiac monitor measures a lead that mimics a standard Lead II ECG.
A Wearable, Long-term Cardiac Monitor
  • We have developed an experimental cardiac monitor for long-term data acquisition and analysis. The monitor consists of a central printed…


Figure 1: The architecture of a 3D ultrasound imaging system with CMUT devices.
Analog Front-end Design for Wearable Ultrasound Systems
  • The capacitive micromachined ultrasound transducer (CMUT) is an alternative to traditional piezoelectric transducers. The CMUT technology provides an opportunity for…


Figure 2: Wearable system prototype.
A Subdermal EEG Monitor for Seizure Detection
  • Epilepsy is a common chronic neurological disorder that affects about 1% of the world population[1]. It is characterized by repeated…


Figure 1: The three dimensions of research development for a universal village.
Universal Village: Our Desired Living Conditions
  • Due to the growing populations in cities, resources for city and village residents have become scare while costs for public…


Figure 2: Concept of a wearable TCD monitoring system.
An Electronically Steered, Wearable Transcranial Doppler Ultrasound System
  • The central objective of critical care for patients affected by neurotrauma, cerebrovascular accident (i.e., stroke), and other neurovascular pathologies is…


Figure 2: Left - The vital signs monitor being worn at the ear with ECG electrodes attached. Center - The wearable vital signs monitor.  Right - A PC USB wireless receiver.
A Wearable Vital-signs Monitor at the Ear
  • Vital signs such as heart rate, blood pressure, blood oxygenation, cardiac output, and respiratory rate are necessary in determining the…


Figure 2:  (a) The dominant current path for T-BCC.  (b) The dominant current path for W-BCC.
Body Coupled Communication
  • Body coupled communication (BCC) uses the conductive tissues in the body as a channel to form a body area network…


Figure 1: Comparison with the state-of-the-art (data adopted from B. Murmann, “ADC Performance Survey 1997-2012,'' http://www. stanford.edu/~murmann/adcsurvey.html).
Low-power High-performance SAR ADC with Redundancy and Digital Background Calibration
  • A. H. Chang, H.-S. Lee, D. S. Boning Sponsorship: Masdar Institute of Science and Technology There is a growing demand…


Figure 2: Plot of the change in voltage drop across one half of the sensor versus the change in voltage drop across the other half of sensor for application of pressure and two directions of shear. The appearance of points for each type of deformation in different quadrants of the plot demonstrates that the sensor can separate pressure and shear. Note that this preliminary data was generated under specific conditions on a single sensor.
Stretchable Pressure- and Shear-sensing Skin Printed from PDMS
  • In the fields of robotics and prosthesis design, there is need for inexpensive, wide-area pressure- and shear-sensing arrays that can…


Figure 1: Neural recordings obtained from the medial prefrontal. (A) Activity in absence of stimulation. (B) Spike shapes isolated from data in (A). (C) Response to 20-Hz optical stimulation. (D) The multi-unit spikes in response to optical pulses across 20 trials identical to the one shown in (C). (E) Firing rate averaged across 20 trials shown in (D). (F) Response to 100-Hz optical stimulation. (G) The multi-unit spikes in response to optical pulses across 20 trials identical to one shown in (F). (H) Firing rate averaged across 20 trials shown in (G).
Flexible Probes for in vivo Recording and Stimulation of Neural Tissue
  • Probing and stimulating neural tissue is important to understand fundamentals of information processing and pathologies of the nervous system such…


Figure 1: Process flow of the single-gated field emission device, simulated using Silvaco.
Silicon Field Emission Devices for X-ray Generation
  • This work focuses on developing an X-ray source using microfabricated silicon field emission devices. In the X-ray source, the electrons…


Figure 1: Interpolation points used as pre-computed Green’s function for a given human body. This model can be used to speed-up the analysis of multiple coil array configurations.
Computational Electromagnetics Tools for High-field Magnetic Resonance Imaging
  • Last-generation magnetic resonance imaging (MRI) scan technology allows combining higher fields with parallel transmit-coil arrays to improve the signal-to-noise ratio…


Figure 1:  A scanning electron micrograph of six ten-probe line-ar arrays assembled into a six-by-ten two-dimensional array of probes.  The probes in this figure and in Figure 2 were fab-ricated for assembly studies and lack sense electrodes.  Each needle is 3.5 mm long and 40 µm wide at the tip.
Scalable 3-D Microelectrode Recording Architectures for Charac-terization of Optogenetically Modulated Neural Dynamics
  • Optogenetics is commonly used for precision modulation of the activity of specific neurons within neural circuits[1], but assessing the impact…


Figure 1:  (a) A photomicrograph of a linear array of five waveguide probes, each which has nine guides.  (b) An SEM micrograph of a 2-D probe array assembled from four linear arrays having five waveguide probes, each of which has twelve guides.  (c) A zoomed-in view of the 2-D array in Figure 1b showing the 45˚ mirrors and output ports.  The scale bars are all 100 µm long.
Waveguide Micro-probes for Optical Control of Excitable Cells
  • Optogenetics is the safe, effective delivery of light-gated membrane proteins to neurons and other excitable cells (e.g., muscle, immune cells,…


Figure 2: Building block of a structured and sparsified decoupling system. The elements labeled as Y’s indicate reactive elements.
Decoupling of Parallel Transmission Arrays in Magnetic Resonance Imaging
  • In coupled parallel transmission (pTx) arrays, the power delivered to a channel is partially transmitted to other channels and partially…


Figure 1: Left: Pressure profile of a vessel bifurcation solved by finite element method. Length of each branch is chosen such that Poiseuille flow is fully developed to satisfy network port assumptions. Right: Compact model extracted by our algorithms. Models can be further parameterized with vessel geometries.
Compact Modeling Techniques for Enabling Full-Body Cardiovascular Simulation
  • The recent development of cardiovascular simulation furthers the understanding of physiological conditions of blood-related disorders. For example, detailed finite volume…


Figure 2: Simulated beam pattern on the sample plane at the depth of 130 mm. The frequency of transmitted acoustic wave from a single element transducer is 2.25 MHz. The beam pattern shows enough uniformity around the center of the sample plane to illuminate the entire cross-section uniformly.
Continuous and Non-invasive Blood Pressure Monitoring via an Ultrasonic Method
  • An arterial blood pressure (ABP) waveform provides valuable information in treating cardiovascular diseases of patients in a critical-care unit. In…