%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 }