Experimental study of penetrating depth of 41 MHz electric capacity field on animal models

Objective To study the heat penetrating effect of radio-frequency projector with 41 MHz electric capacity on animal models.Methods The experiment was carried out in domestic pig and canine,their abdominal areas were locally heated by radio-frequency projector for 30 min and 45 min respectively.The diameter of electrode was 20 cm.Four optical fiber thermometers were separately placed on/in the skin,subcutaneous tissue or fat tissue,muscle and peritoneal cavity.Results After 30 min of heating,the temperture of muscle and peritoneal cavity in canine was 41.0℃ and 42.4℃ respectively,after heating 45 min,the temperature of peritoneal cavity rose to 44.8℃.While the pig being heated for 30 min,the temperature of fat,muscle and peritoneal cavity was 37.8℃,40.1℃ and 42.2℃ separately.On pathological findings,that congestion and inflammatory cell infiltration in the walls of intestine and colon as well as mesenterium were found.Conclusion The study shows that the 41 MHz electric capacity field(radio-frequency) can provide a safe and satisfactory heat penetrating effect without obvious fat overheating occurrence for experimental animals.