Vacuum coagulation probes
View Patent ↗An embodiment of the invention includes a surgical device for coagulating soft tissue such as atrial tissue in the treatment of atrial fibrillation, atrial flutter, and atrial tachycardia; tendon or ligament shrinkage; or articular cartilage removal. The surgical device integrates a suction mechanism with the coagulation mechanism improving the lesion creation capabilities of the device. The surgical device comprises an elongate member having an insulative covering attached about conductive elements capable of coagulating soft tissue when radiofrequency or direct current energy is transmitted to the conductive elements. Openings through the insulative covering expose regions of the conductive elements and are coupled to lumens in the elongate member which are routed to a vacuum source. Suction causes the soft tissue to actively engage the opening thus the integrated, exposed conductive elements to facilitate the coagulation process and ensure the lesions created are consistent, continuous, and transmural. The embodiments of the invention can also incorporate cooling mechanisms associated with the conductive elements and coupled to a fluid source to passively transport fluid along the contacted soft tissue surface to cool thus pushing the maximum temperature deeper into tissue.
1. A surgical device for coagulating soft tissue comprising:
a first elongate member comprising a tubular structure with a side wall defining a first lumen, and at least one conductive element associated with said side wall;
at least one opening through said side wall, said opening coupled to said first lumen and exposing said conductive element;
at least one injection tube separate from said conductive element; said injection tube comprising a second lumen and at least one distal aperture fluidly coupled to said first lumen;
at least one electrical conduit attached to said conductive element;
wherein said first lumen connects to a vacuum source; said second lumen connects to a fluid source; and said electrical conduit connects to an energy transmission source.
2. The device of claim 1 wherein said conductive element comprises at least one helical winding having a pitch that is greater than or equal to two times the winding width.
3. The device of claim 1 wherein said conductive element comprises at least one helical winding having a pitch that is greater than or equal to four times the winding width.
4. The device of claim 1 wherein the injection tube comprises a malleable metal or alloy that is configured to impart a shape to the electrical conduit or elongate member.
5. The device of claim 1 wherein the injection tube comprises tube selected from a polymer tube and a braided polymer tube.
6. The device of claim 1 where the injection tube is embedded within the elongate member.
7. The device of claim 1 further comprising a stylette having a shape, such that when inserted into the injection tube, a shape of the elongate member adjusts to the shape of the stylette.