Deás YD, Gilart GF, Quintana RD

Language: Spanish
References: 12
Page: 908-914
PDF size: 303.85 Kb.

ABSTRACT

A study of the electromagnetic field generated by different electrodes of capacitive type, used by the physiotherapy device for short wave diathermy (YB4-66), was carried out considering their interaction with the surrounding environment. The measurements of the electric field for different treatment configurations were carried out and a meter with electric isotropic field probe was used. By means of a professional software of simulation, a two-dimensional parametric electromagnetic model with axial symmetry was designed, to obtain detailedly in each configuration of the evaluated electrodes the interaction of the electromagnetic field with the biological tissue and the external environment. A good correspondence was found between the obtained results in an experimental way and the simulations, which allowed to identify the exposure levels and to make decisions to achieve a more effective treatment and with the shortest possible damage for the human beings.

REFERENCES

1. Martín Cordero JE. Agentes físicos terapéuticos. La Habana: ECIMED; 2008.

2. Suárez Cabrera R, Diéguez Suárez R. Valoración del riesgo ocupacional por exposición a campos electromagnéticos en trabajadores que aplican el tratamiento con diatermia. Rev Cubana Hig Epidemial. 1990; 28(1): 81-7.

3. ICNIRP. Guidelines for limiting exposure to time-varying electric, magnetic, and electromagnetic fields. Health Physics. 1998;74(4): 494–522.

4. Polk Ch, Elliot P. Handbook of biological efects of electromagnetic felds. 2th. CRC Press. 1996.

5. ANSI/IEEE, C95.6–2002, IEEE Standard for Safety Levels with Respect to Human Exposure to Electromagnetic fields, 0–3 kHz. New York: Institute Electrical Electronics Engineers; 2002.

6. ANSI/IEEE, C95.1–2001, IEEE Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz. New York: Institute Electrical Electronics Engineers; 2001.

7. Shields N, O'Hare N, Gormley J. An evaluation of safety guidelines to restrict exposure to stray radiofrequency radiation from short-wave diathermy units. Phys Med Biol. 2004;49(13):2999-3015.

8. Shields N, Gormley J, O'Hare N. Physiotherapist’s perception of risk from electromagnetic fields. Adv Physiotherapy. 2005; 7(4): 170-5.

9. Comsol Multiphysics. Reference guide. Stockholm Sweden: Institute of Physics, University; 2007.

10. Drizdal T, Vrbal M, Cifral M, Togni P. Feasibility Study of Superficial Hyperthermia Treatment Planning Using COMSOL Multiphysics. Prague: Proceeding of Microwave Techniques; 2008.

11. Evans DJ, Manwaring ML. Electric Current Model of Varying Tissue Properties. Boston: Proceedings of the COMSOL Users Conference; 2006.

12. Gabriel C, Gabriel S. Compilation of the dielectric properties of body tissues at RF and microwave frequencies. Texas: Radiofrequency Radiation Division; 1996.