In questa sezione troverete i lavori presentati alle Conferenze mondiali COMSOL. Le presentazioni descrivono ricerche e prodotti innovativi progettati con COMSOL Multiphysics da colleghi di tutto il mondo. I temi delle ricerche presentate abbracciano un'ampia gamma di settori produttivi e aree applicative, in ambito elettrico, meccanico, fluidodinamico e chimico. Lo strumento di Ricerca Rapida vi permetterà di trovare le presentazioni che si riferiscono all'area di vostro interesse.

Designing Polymer Thick Film Intracranial Electrodes for use in Intra-Operative MRI Setting.

G. Bonmassar[1], and A. Golby[2]
[1]AA. Martinos Center, Massachusetts General Hospital, Charlestown, Massachusetts, USA
[2]Department of Neurosurgery, Brigham and Women’s Hospital, Boston, Massachusetts, USA

A new type of MRI compatible intracranial electrode based on Polymer Thick Film (PTF) is presented and studied using COMSOL Multiphysics. The geometry considered was a two-dimensional cross section cut of 5 mm thick electrodes with 5 cm leads on top of a 2×10 cm slab representing Gelfilm, or the substrate. The resistive leads were compared with metallic leads to estimate the ...

Cavity Sprayer Flow Optimization for Medical Devices Industry

T. Selvam, V.P. Kotte, and M. Marimuthu

HCL Technologies Ltd, Chennai, Tamil Nadu, India

Globally in Otolaryngology industry, Sinusitis is one of the most common diseases related to the nose. Sinusitis is caused when the cilia fail to move the mucus. As a result sinus tissue gets infected that leads to blockage of the sinuses. All the sinusitis can not be cured through drugs and certain require surgery. When a sinus cavity subjected to a nasal endoscopic surgical procedure, one of ...

Numerical Homogenization in Multi-scale Models of Musculoskeletal Mineralized Tissues

A. Gerisch[1], S. Tiburtius[1], Q. Grimal[2], and K. Raum[3]
[1]Technische Universität Darmstadt, Darmstadt, Germany
[2]Laboratoire d’Imagerie Paramétrique, UPMC, Paris, France
[3]Julius Wolff Institut & Berlin-Brandenburg School for Regenerative Therapies, Charité-Universitätsmedizin Berlin, Berlin, Germany

Musculoskeletal mineralized tissues (MMTs), e.g. bone, are hierarchical composite materials. Their effective elastic properties at different scales are of interest for computational studies of the MMT’s response to mechanical loading but also to realistically simulate implant osseointegration. We combine multi-scale and multi-modal experimental techniques with mathematical modelling of MMTs ...

Optimizing Performance of Equipment for Thermostimulation of Muscle Tissue using COMSOL Multiphysics

J. Kocbach[1], K. Folgerø[1], L. Mohn[2], O. Brix[3]
[1]Christian Michelsen Research, Bergen, Norway
[2]Luzmon Norway, Bergen, Norway
[3]Michelsen Medical, Bergen, Norway

The design challenge for thermostimulation equipment is to get a combination of high electric field strength and high temperature within the muscle tissue without causing pain or skin burns. In the present work, COMSOL Multiphysics is used to simulate the temperature distribution and electric field distribution within body tissue for varying body composition and varying design parameters of the ...

Finite Element Analysis of Defibrillation Current Density in Pregnant Women

A. Jeremic[1], E. Khosrowshahli[1]
[1]McMaster University, Hamilton, ON, Canada

Although resuscitation during pregnancy is relatively uncommon and rarely causes death, they have a particularly large impact in terms of the mortality of the unborn child and long-term effects on families and society as whole. In this paper, we present a new 3D finite element model of a pregnant female torso which accounts for presence of amniotic liquid and calculate current density ...

Performance of a Miniaturized Hydrocyclone for the Isolation of Schistosoma Mansoni Eggs - new

C. Soares[1], N. Padoin[1], F. Montalvo[2], D. Cobra[2]
[1]Federal University of Santa Catarina, Florianópolis, SC, Brazil
[2]CERTI Foundation, Florianópolis, SC, Brazil

Schistosoma mansoni parasites affect million people worldwide. The intensity of the infection can be evaluated by the number of eggs present in the stool of an infected individual. The application of the traditional methods has been regarded as impractical in developing areas and there is a continuous search for new techniques. In face of this scenario, a new method of diagnosis was explored in ...

A Mean Field Approach to Many-particles Effects in Dielectrophoresis

O. Nicotra, and A. La Magna
CNR-IMM Sezione di Catania, Catania, Italy

One of the major applications for dielectrophoresis is the selective trapping and fractionation in lab-on-a-chip devices. Nevertheless, many-particle effects due to high concentrations of biological material around electrodes can cause a rapid decrease of trapping efficiency in dielectrophoretic devices. In this contribution we present a new approach based on a drift-diffusion dynamics to study ...

Influence of pH and Carbonate Buffering on the Performance of a Lactate Microbial Fuel Cell

A.Torrents, N. Godino, F.J. del Campo, F.X. Muñoz, and J. Mas
Universitat Autònoma de Barcelona, Spain

Microbia Fuel Cells (MFC’s) are complex environments where electrochemical, physical and biological aspects must be considered together. In this work we present a 1D model partially describing a Shewanella oneidensis MFC that degrade sodium lactate [lactate -> Acetate + CO2 + 2H+ + 2e-]. The model, simulated using COMSOL, focuses on pH implications of the MFC operation. Release of protons during ...

Particle Tracing: Analysis of Airborne Infection Risks in Operating Theatres

P. Apell[1], S. Hjalmarsson[1], T. Lindberg[1], I. Wernström[1], Y. Tarakonov[1], A. Erichsen Andersson[2], M. Karlsteen[1]
[1]Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden
[2]Sahlgrenska University Hospital, Department of Anesthesia, Surgery and Intensive Care, Göteborg, Sweden

Patients undergoing surgery are sensitive to infections. The operation staff may spread 10^4 particles per person per minute, of which ten percent are presumed bacteria-carrying. We visualize the influence of the personnel on the air and particle flows for the two most common ventilation systems in Swedish hospitals using Comsol Multiphysics with particle tracing.. The Laminar Air flow ...

Electrical Response and Thermal Damage Assessment of Cutaneous and Subcutaneous Tissues to Noninvasive Radiofrequency Heating: A Computational Modeling Study

A. González-Suárez[1,2], J. N. Jimenez-Lozano[3], W. Franco[1]
[1]Wellman Center for Photomedicine, Massachusetts General Hospital & Harvard Medical School, Boston, MA, USA
[2]Biomedical Synergy, Electronic Engineering Department, Universitat Politècnica de València, Valencia, Spain
[3]ZELTIQ Aesthetics, Inc., Pleasanton, CA, USA

Electromagnetic radiofrequency (RF) sources are widely used to heat up cutaneous and subcutaneous tissues. The subcutaneous morphology of tissue consists of a fine, collagenous and fibrous septa network enveloping clusters of adipocyte cells; however, it is commonly regarded as a homogeneous fat layer in computational models. In the present study the objective is to assess the effect of the ...