双电极射频热凝物形态研究

A study on the form of lesions produced by bipolar radiofrequency

目的观察双针电极间距在2～14mm时双针射频热凝形态。方法用ELEKTA射频治疗仪,将两支100.5mm长、22G射频电极针分别以2、4、6、8、10、12、14mm间距平行固定在鸡蛋清中,并放置直尺作为参照物。在90℃190s下进行射频热凝,若190s末两电极针之间不能形成稳定的热凝物,则热凝时间增加至290s。每间距组各行10次热凝。加热开始后,每隔10秒拍摄一幅图片,利用PHOTOSHOP软件计算各间距最终热凝物的长度、宽度、面积、电极外围热凝物的最大值。结果双针间距2、4、6、8、10、12mm时双电极针之间均能形成带状热凝,2～10mm间距时热凝物形态较均匀,热凝物长度及面积随电极间距增大而增加,而热凝物宽度及电极外围最大值并不随间距增大而增加。结论双针电极间距在2～12mm之间均能形成带状热凝物;当间距增大时,可通过增加加热时间的方法来增加热凝物面积。

Objective To study the lesion morphology when the distance of two radiofrequency cannulae was arranged between 2 and 14 mm.Methods Two 22-gauge 100.5 mm radionics cannulae were secured in a parallel position 2,4,6,8,10,12 and 14 mm apart and submerged in egg white.Temperatures of the probes were raised from 34 ℃ to 90 ℃ at a constant rate and were held at 90 ℃ for 190 s.If the lesions between two cannulae were not stable,90 ℃ would be held longer until 290 s. The test was repeated for ten times at each distance.The progress of lesion formation was photographed every 10 s since heating was started,and the surface area of the lesions was measured by Adobe Photoshop.Results Continuous strip lesions were all produced when the cannulae were spaced between 2 to 12 mm.The lesions were steady when the cannulae were seperated by 2~10 mm. As the distance between probes and lesion time increase,the lesion length and area increased accordingly While the width of the lesion and the length between near termial and cannulae remain the same.Conclusion The strip lesions were produced when the probes were placed between 2 to 12 mm.The lesion area could be enlarged by prolonging the time of heating in case of increasing the distence between two cannulae.