Patent ID: 8920416

Claim:
A tissue ablation device, comprising: an ablation probe comprising an elongated probe shaft having a proximal end, a distal end, and a plurality of electrodes comprising a proximal electrode array and a distal electrode array carried on the elongated probe shaft distal end; and a cannula comprising: an elongated cannula shaft having a proximal end, a distal end, and concentric inner and outer tubes extending along a common longitudinal axis, wherein the inner and outer tubes are rotationally translatable about the longitudinal axis relative to each other, wherein the outer tube comprises a proximal portion and a distal portion, wherein the proximal portion is separately translatable from the distal portion, a lumen extending longitudinally within the elongated cannula shaft between the proximal and distal ends, wherein the cannula lumen is configured for removably receiving the elongated probe shaft, a plurality of proximal and distal inner apertures disposed transversely through a wall of the inner tube and in communication with the cannula lumen, and a plurality of proximal and distal outer apertures disposed transversely through a wall of the outer tube, wherein the proximal portion of the outer tube is configured for being translated to selectively align the proximal inner and outer apertures and misalign the proximal inner and outer apertures, wherein the distal portion of the outer tube is configured for being translated to selectively align the distal inner and outer apertures and misalign the distal inner and outer apertures, and wherein the proximal electrode array is deployable through the proximal inner and outer apertures when aligned, and the distal electrode array is deployable through the distal inner and outer apertures when aligned.