ISSN:
0197-8462
Keywords:
skin wound healing
;
rectangular pulse electrical currents
;
perpendicular
;
tangential
;
anisotropic
;
Life and Medical Sciences
;
Occupational Health and Environmental Toxicology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Biology
,
Physics
Notes:
We examined experimentally the relationship between perpendicular and tangential electrical conductivities, σ, and peak current density J, in pig skin dermis and subcutaneous fat specimens by using a four-electrode measuring system with rectangular pulse electrical current (RPEC). We also investigated the relationship of the conductivity, σ, vs. pulse rate, f. The rates were selected at 8, 32, 64, and 128 pulses per second (pps), and the pulse width was fixed at 140 μs. These values are often used in vivo to enhance cutaneous regeneration with RPEC stimulation. It was found that the conductivities may be approximated to be $$\sigma_d= [\sigma_{dx}\sigma_{dy}\sigma_{dz}]= \hbox{[0.38 S/m 0.38 S/m 0.27 S/m]}$$ for the skin dermis and $$\sigma_f= [\sigma_{fx}\sigma_{fy}\sigma_{fz}]= \hbox{[0.074 S/m 0.074 S/m 0.045 S/m]}$$ for the subcutaneous fat in the conditions of this experiment. These findings implies that the conductivities of pig skin dermis and subcutaneous fat are anisotropic, i.e., σx = σy ≠ σz. It was also found that the conductivities are independent of current density and pulse rate in the current range from 20 μA/cm2 to 120 mA/cm2. © 1996 Wiley-Liss, Inc.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
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