Localized impedance measurements at the needle tip identifying the present tissue type could aid clinicians in needle procedures. To assess the sensitivity field of a hollow, bipolar needle electrode, a 3D finite element approach using COMSOL Multiphysics was chosen. The simulated bipolar needle electrode consists of two hypodermic needles (17 G and 23 G) with an insulating layer of polytetrafluoro-ethylene (PTFE) in between. Impedance values were recorded while steadily increasing the insertion depth of the needle electrode in a layered tissue structure of skin (dermis), fat, and blood. Simulation results reveal a highly local sensitivity volume around the needle tip that can be approximated by half a tri-axial ellipsoid with elliptic radii of 0.735 mm, 2.886 mm, and 1.774 mm. A comparison with simulated and measured impedance values shows great correspondence.
%0 Journal Article
%1 liu2021simulation
%A Liu, Jan
%A Hauser, Lina
%A Kappel, Marcel
%A Goehring, Chris
%A Pott, Peter Paul
%D 2021
%J Current Directions in Biomedical Engineering
%K myown
%T Simulation and Experimental Investigation of a Hollow, Bipolar Needle Electrode
%X Localized impedance measurements at the needle tip identifying the present tissue type could aid clinicians in needle procedures. To assess the sensitivity field of a hollow, bipolar needle electrode, a 3D finite element approach using COMSOL Multiphysics was chosen. The simulated bipolar needle electrode consists of two hypodermic needles (17 G and 23 G) with an insulating layer of polytetrafluoro-ethylene (PTFE) in between. Impedance values were recorded while steadily increasing the insertion depth of the needle electrode in a layered tissue structure of skin (dermis), fat, and blood. Simulation results reveal a highly local sensitivity volume around the needle tip that can be approximated by half a tri-axial ellipsoid with elliptic radii of 0.735 mm, 2.886 mm, and 1.774 mm. A comparison with simulated and measured impedance values shows great correspondence.
@article{liu2021simulation,
abstract = {Localized impedance measurements at the needle tip identifying the present tissue type could aid clinicians in needle procedures. To assess the sensitivity field of a hollow, bipolar needle electrode, a 3D finite element approach using COMSOL Multiphysics was chosen. The simulated bipolar needle electrode consists of two hypodermic needles (17 G and 23 G) with an insulating layer of polytetrafluoro-ethylene (PTFE) in between. Impedance values were recorded while steadily increasing the insertion depth of the needle electrode in a layered tissue structure of skin (dermis), fat, and blood. Simulation results reveal a highly local sensitivity volume around the needle tip that can be approximated by half a tri-axial ellipsoid with elliptic radii of 0.735 mm, 2.886 mm, and 1.774 mm. A comparison with simulated and measured impedance values shows great correspondence.},
added-at = {2021-11-09T21:01:11.000+0100},
author = {Liu, Jan and Hauser, Lina and Kappel, Marcel and Goehring, Chris and Pott, Peter Paul},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/213d06418be5b27929d9b07570dfad3ac/peterpott},
interhash = {e5b0126c2e56fd437fa4884997e2c3d3},
intrahash = {13d06418be5b27929d9b07570dfad3ac},
journal = {Current Directions in Biomedical Engineering},
keywords = {myown},
timestamp = {2021-11-09T20:02:35.000+0100},
title = {Simulation and Experimental Investigation of a Hollow, Bipolar Needle Electrode},
year = 2021
}