Kay L, Nielsen H B
Scand J Urol Nephrol. 1985;19(4):257-9. doi: 10.3109/00365598509180266.
To protect the surgeon during transurethral resection (TUR), addition of an earthing lead to the resectoscope sheath has been recommended. In vivo measurements during a prostatic TUR showed that 45% of the high-frequency current returned to earth via such a wire. In vitro tests showed bleeding to have little influence on the amount of current returning through the earthing lead. Since the current in the resectoscope sheath generates heat that may cause secondary urethral stricture, the best safeguard for both patient and surgeon against leak of current is use of an insulated sheath.
为在经尿道切除术（TUR）过程中保护外科医生，有人建议在切除镜鞘上增加一条接地导线。前列腺TUR术中的体内测量表明，45%的高频电流通过这样一根导线返回大地。体外试验表明，出血对通过接地导线返回的电流量影响很小。由于切除镜鞘中的电流会产生热量，可能导致继发性尿道狭窄，因此对患者和外科医生防止电流泄漏的最佳保护措施是使用绝缘鞘。
