McBride D Q, Patil A A, Yamanashi W
Division of Neurosurgery, Harbor-UCLA Medical Center, UCLA School of Medicine.
Neurosurgery. 1994 Jul;35(1):163-6; discussion 166-7. doi: 10.1227/00006123-199407000-00029.
The electromagnetic field focusing (EFF) surgical instrument creates an oscillating electromagnetic field that induces eddy currents in the tissue, which converge at the point of contact. This energy creates a focal spark capable of vaporizing tissue. The EFF instrument was used to resect 17 meningiomas in 14 patients. The effectiveness of the EFF probe in resecting tumor tissue was compared with that of the Cavetron ultrasonic surgical aspirator (Model 100) in 11 patients. The EFF system was superior to the Cavetron ultrasonic surgical aspirator in tumor excision in all but two cases, in which the EFF grounding tip was poorly tuned. Surgical time and blood loss were reduced by subjective analysis in all but these two cases, especially in the rubbery or calcified meningiomas resistant to aspiration. No complications were directly attributable to use of the EFF. Drawbacks encountered with the EFF system include buildup of "char" on the tip, requiring scraping, and intense heat at the tip, which occasionally melted the insulating sheath, requiring replacement.
电磁场聚焦（EFF）手术器械会产生一个振荡电磁场，该电磁场会在组织中感应出涡电流，这些涡电流在接触点汇聚。这种能量会产生一个能够汽化组织的聚焦火花。EFF器械被用于切除14例患者的17个脑膜瘤。在11例患者中，将EFF探头切除肿瘤组织的有效性与Cavetron超声手术吸引器（100型）的有效性进行了比较。除两例EFF接地尖端调谐不佳的情况外，EFF系统在肿瘤切除方面优于Cavetron超声手术吸引器。除这两例情况外，通过主观分析，手术时间和失血量均有所减少，尤其是在对抽吸有抵抗的橡皮样或钙化脑膜瘤中。未发现直接归因于使用EFF的并发症。EFF系统遇到的缺点包括尖端会积聚“焦痂”，需要刮除，以及尖端会产生高热，偶尔会使绝缘鞘熔化，需要更换。
