Hollow body cavity ablation apparatus

摘要

An ablation apparatus places electrodes at the perimeter of a cavity. In an embodiment, the alternating electric field is used to expose the cavity to enough energy to ablate the cavity. In an embodiment, two modes are used to expose different regions of the cavity to different amounts of power for so that the thermal effect is more uniform. In an embodiment, the electrodes have a relatively large surface area so as to avoid charring the cavity, but are shaped so as to fit within a body orifice. For example, the diameter of the sheathed housing the electrodes during penetration may be only 5.5 mm.

主权项

1. A hollow body ablation apparatus, comprising:
a head having at least three electrodes and at least one insulator, the head including an elongated member having sides and a base, the sides and the base being flexible, wherein the sides have a length and the base has a width; a sheath; a handpiece connected to the head; a width adjustment; a length adjustment; wherein the head is configured to collapse into the sheath, wherein the width adjustment and the length adjustment are configured to operate separately; a width knob on an outside of the handpiece; a width sliding member; at least one lever; at least one push-pull wire, wherein the width knob is attached to the width sliding member and the width sliding member is further connected to the at least one lever, wherein the at least one lever is attached to the at least one push-pull wire which can adjust the width of the base of the head; a first joint, a second joint, a third joint, a fourth joint and a fifth joint; the at least one lever including a first lever, a second lever and a third lever; a central tube which connects to the at least one push-pull wire; a sliding piece which connects to the central tube; wherein the first lever is attached to the handpiece by the first joint so that the first lever is rotatable with respect to the first joint; wherein the first lever is attached to the second lever by the second joint so that the second lever is rotatable with respect to the second joint as the first lever moves; wherein the third lever is attached to the first lever by the third joint so that the third lever and the first lever are rotatable with respect to the third joint as the third lever moves; wherein the third lever attached to the width sliding member by the fourth joint so that as the width sliding member slides, the third lever is rotatable with respect to the fourth joint; and wherein the second lever is further connected to the sliding piece by the fifth joint so that as the second lever moves and rotates with respect to the fifth joint, the sliding piece slides to push or pull the central tube and the at least one push-pull wire.