N.S. Lawand, J. van Driel, P.J. French
Electronic Instrumentation Laboratory (EILab), Faculty of Electrical Engineering, Mathematics and Computer Science (EEMCS), Delft University of Technology, Delft, The Netherlands
Delft University of Technology, Delft, The Netherlands
Cochlear Implants are implantable devices which bypasses the non-functional inner ear and directly stimulates the hearing nerve with electric currents thus enabling deaf people to experience sound again. Implant electrode array design is limited in electrode count, due to their large size in accordance to scala tympani (ST) with restrictions for deeper insertion in ST thus depriving access to low ...
I.M. Abdel-Motaleb, K. Ravanasa, K.J. Soderholm
Department of Electrical Engineering, Northern Illinois University, DeKalb, IL, USA
Department of Restorative Dental Sciences, College of Dentistry, University of Florida, Gainesville, FL USA
Studying teeth grinding behavior and other oral conditions requires the ability to accurately measure the pressure on the teeth. Placing a sensor in the mouth requires small size devices with powering and measurement techniques that do not hinder the normal life of the patient. To meet these requirements, we designed, using COMSOL, a small, easy to read MEMS capacitive force sensor, with ...
J. Jimenez-Lozano, P. Vacas-Jacques, W. Franco
Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
Radiofrequency (RF) technology offers unique advantages for noninvasive selective heating of relatively large volumes of tissue. In this work, we present a mathematical model for selective non-invasive, non-ablative RF heating of cutaneous and subcutaneous tissue (with detailed fiber septa structures) including their thermo-elastic response. Our analysis shows that the fiber septa architecture ...
A. Jeremic, E. Khosrowshahli
McMaster University, Hamilton, ON, Canada
Although mammography is extremely important diagnostic technique, it suffers from some limitations such as false negative and positive results, using ionizing radiation and patient’s discomfort. Microwave imaging has been recently proposed as an additional medical imaging technique which can potentially overcome some of the shortcomings of the mammography. We believe that the accuracy of ...
Three-Dimensional Finite Element Modeling of Current Density in Maternal Transthoracic Defibrillation
A. Jeremic, J. Potts, E. Khosrowshahli
McMaster University, Hamilton, ON, Canada
McMaster University Hospital, Hamilton, ON, Canada
Although the cardiac arrest in pregnancy is a rare event it can have significant impact in terms of age of mother, mortality of unborn children and consequently long-term effect. One of the commonly used procedures in resuscitation is defibrillation. With recent advances in understanding pathophysiologies in pregnant women it became more obvious that previous studies should be extended to ...
Clemson University, Clemson, SC, USA
Surface acoustic wave (SAW) devices are commonly used as wireless filters, resonators, and sensors. The confinement of acoustic energy near the surface of a piezoelectric substrate in a SAW sensor makes it highly sensitive for discerning surface perturbation. As sensors, SAW devices have the potential to provide a high-performance sensing platform with capabilities of remote and high-temperature ...
Lowering of the Interstitial Fluid Pressure as a Result of Tissue Compliance Changes during High Intensity Focused Ultrasound Exposure: Insights from a Numerical Model
E. Sassaroli, B. O'Neill 
The Methodist Hospital Research Institute, Houston, TX, USA
Interstitial fluid pressure (IFP) is elevated in tumors. Owing to this elevated IFP, the interstitial fluid velocity (IFV) is negligible throughout the tumor but significant near the tumor margin. Any therapeutic strategy that can lower IFP will improve drug convection within the tumor and decrease convection of drugs from the tumor margin. High intensity focused ultrasound (HIFU) has been shown ...
H. Chen-Mayer, R.E. Tosh
National Institute of Standards and Technology, Gaithersburg, MD, USA
The radiation dose produced by an x-ray CT scanner to the patient is conventionally referenced to measurements performed by an ionization chamber in a phantom. On a fundamental level, the radiation absorbed dose, J/kg, can be determined directly by the temperature rise in the absorbing material. We model the temperature response in a high density polyethylene (HDPE) phantom. Use of COMSOL ...
M. Christian, S. Firebaugh, A. Smith
United States Naval Academy, Annapolis, MD, USA
This project utilizes the heat transfer module of the COMSOL Multiphysics environment to model the effects that an ohmic heating probe will have on neural tissue. The model quantifies the thermal impact of active components embedded on a neural micro probe by solving the Penne’s bioheat equation with an external MATLAB function to determine the heat generation along the length of the probe. ...
M. Cartas-Ayala, R. Karnik
Massachusetts Institute of Technology, Cambridge, MA, USA
Characterization of particles has numerous applications in science and diagnostics. Recently, particle passage through constrained microchannels has been proposed to characterize particles based on their passage velocity. Nevertheless, there is no clear understanding of how the physics in this system interact. Here we quantify the effects of the flow around the particle by simulating the passage ...