Conductivities of pig dermis and subcutaneous fat measured with rectangular pulse electrical current

✍ Scribed by K. Cheng; P.P. Tarjan; P.M. Mertz

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 763 KB
• Volume: 17
• Category: Article
• ISSN: 0197-8462
• DOI: 10.1002/(sici)1521-186x(1996)17:6<458::aid-bem5>3.0.co;2-2

✦ Synopsis

We examined experimentally the relationship between perpendicular and tangential electrical conductivities, 0, 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, 0, 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 ps. 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 od = [odxodyodz] = [0.38 Slm 0.38 Slm 0.27 S/m] for the skin dermis and or = [ofxofyofz] = [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., G~ = o, # 0,. It was also found that the conductivities are independent of current density and pulse rate in the current range from 20 pAlcm' to 120 mA/cm'. o 1996 Wiley-Liss, Inc.