Radiofrequency Ablation Probe with Directional Cooling for Lesion Size Control

摘要

A cooled radiofrequency ablation system including a probe assembly having a proximal region, a distal tip region, and a shaft is provided. First and second internal cooling fluid tubes extend from the proximal region and are positioned inside a cavity defined by the shaft. The distal tip region includes a conductive portion for delivering energy to a target location within tissue. The system also includes a radiofrequency generator for delivering energy to the target location and a cooling fluid reservoir and a bidirectional pump assembly for circulating a cooling fluid from the reservoir through the first internal cooling fluid tube then the second internal cooling fluid tube when the pump operates in a first direction or through the second internal cooling fluid tube then the first internal cooling fluid tube when the pump operates in a second direction to form lesions of different sizes at the target location.