离体猪椎体多极射频消融范围及热场分布

目的 通过对离体猪椎体进行射频消融(RFA),观察其骨质凝固范围及热场分布,探讨RFA时电极针在椎体中的位置与脊髓的安全性关系,以及椎体周围有无软组织损伤.方法 取30节新鲜成年猪椎体,随机分成两组.电极针深度分别为10、20 mm.消融达稳态后按预先设计测温点测温.消融20 min后,沿电极针及垂直于电极针平面切开观察骨质凝同范围.结果 各测温点在3.5 min达稳态.靠电极越近温度上升越快.两组椎体周围软组织无损伤,当电极针深10、20 mm时均无脊髓损伤.结论 对椎体后壁保持完整的椎体转移性肿瘤RFA治疗安全、可靠.

The ablated volume and the thermal field distribution in swine vertebral body created by multi-polar radiofrequency ablation: an experiment in vitro

Objective To observe the extent of bone coagulation and the thermal field distribution created in ablating the swine vertebral bodies in vitro with multi-polar radiofrequency and to discuss the correlation between the electrode position in the vertebral body and the safety of the spinal cord as well as the soft tissue injury around the vertebral body. Methods Thirty fresh adult porcine vertebrae, were randomly and equally divided into two groups. The depth of the electrode needle was 10 mm or 20 mm. When the ablation process reached to a stable state, the temperature at the scheduled spots was estimated. Twenty minutes after ablation, the vertebral body was cut along the electrode needle plane and also along the plane perpendicular to the electrode needle to observe the extent of bone coagulation. Results The temperature at the scheduled spots reached to a stable state in 3.5 minutes. The more close to the electrode the spot was,the more quickly the temperature rose. No soft tissue injury around the vertebral body was observed in both groups and no spinal cord injury occurred when the electrode needle was 10 mm or 20 mm deep in the vertebral body. Conclusion In treating vertebral metastases, the radiofrequency ablation is safe and reliable if the posterior wall of the vertebral body remains intact.