Electroporation is an approach used to enhance transdermal transport of large molecules in which the skin is exposed to a series of electric pulses. Electroporation temporarily destabilizes the structure of the outer skin layer, the stratum corneum, by creating microscopic pores through which agents, ordinarily unable to pass into the skin, are able to pass through this outer barrier. Long duration electroporation pulses can cause localized temperature rises, which result in thermotropic phase transitions within the lipid bilayer matrix of the stratum corneum. This paper focuses on electroporation pore development resulting from localized Joule heating. This study presents a theoretical model of electroporation, which incorporates stratum corneum lipid melting with electrical and thermal energy equations. A transient finite volume model is developed representing electroporation of in vivo human skin, in which stratum corneum lipid phase transitions are modeled as a series of melting processes. The results confirm that applied voltage to the skin results in high current densities within the less resistive regions of the stratum corneum. The model captures highly localized Joule heating within the stratum corneum and subsequent temperature rises, which propagate radially outward. Electroporation pore development resulting from the decrease in resistance associated with lipid melting is captured by the lipid phase transition model. As the effective pore radius grows, current density and subsequent Joule heating values decrease.
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e-mail: smbecker@unity.ncsu.edu
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October 2007
Technical Papers
Local Temperature Rises Influence In Vivo Electroporation Pore Development: A Numerical Stratum Corneum Lipid Phase Transition Model
S. M. Becker,
S. M. Becker
Mechanical and Aerospace Engineering,
e-mail: smbecker@unity.ncsu.edu
North Carolina State University
, Box 7910, Raleigh, North Carolina 27695
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A. V. Kuznetsov
A. V. Kuznetsov
Mechanical and Aerospace Engineering,
North Carolina State University
, Box 7910, Raleigh, North Carolina 27695
Search for other works by this author on:
S. M. Becker
Mechanical and Aerospace Engineering,
North Carolina State University
, Box 7910, Raleigh, North Carolina 27695e-mail: smbecker@unity.ncsu.edu
A. V. Kuznetsov
Mechanical and Aerospace Engineering,
North Carolina State University
, Box 7910, Raleigh, North Carolina 27695J Biomech Eng. Oct 2007, 129(5): 712-721 (10 pages)
Published Online: March 7, 2007
Article history
Received:
November 3, 2006
Revised:
March 7, 2007
Citation
Becker, S. M., and Kuznetsov, A. V. (March 7, 2007). "Local Temperature Rises Influence In Vivo Electroporation Pore Development: A Numerical Stratum Corneum Lipid Phase Transition Model." ASME. J Biomech Eng. October 2007; 129(5): 712–721. https://doi.org/10.1115/1.2768380
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