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US 5,545,161 AGranted
Catheter for RF ablation having cooled electrode with electrically insulated sleeve
AssigneeCardiac Pathways Corporation
InventorMir A. Imran
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AssigneeCardiac Pathways Corporation
InventorMir A. Imran
Estimating the term…
A catheter for radio frequent ablation of tissue which includes a flexible elongate member having proximal and distal extremities. The flexible elongate member is provided with a lumen in the distal extremity. A metal conducting electrode is secured to the distal extremity of the elongate member and has first and second extremities. The electrode is provided with a chamber therein which is in communication with the lumen. A conductor extends through the elongate member from the proximal to distal extremities for supplying radio frequency energy to the electrode. Coolant is disposed in the chamber and in contact with the electrode for dissipating heat created in the electrode by the application of radio frequency energy thereto. A sleeve made from an electrically insulating material extends over at least the first extremity of the electrode.
A catheter for use with a liquid cooling to perform radio frequency ablation of tissue comprising a flexible elongate member having proximal and distal extremities and an outer surface, the flexible elongate member being provided with liquid supply and liquid withdrawal lumens extending between the proximal and distal extremities, a conducting metal tip electrode secured to the distal extremity of the flexible elongate member and having an outer surface which adjoins the outer surface of the flexible elongate member, the tip electrode having a chamber therein which is in communication with the liquid supply and liquid withdrawal lumens, conductor means extending through the flexible elongate member for supplying radio frequency energy to the tip electrode and a layer of insulating material extending over the outer surface of the flexible elongate member and the outer surface of the tip electrode in the region where the outer surfaces adjoin each other for inhibiting the formation of hot spots in the vicinity of the adjoining outer surfaces.
A catheter for radio frequency ablation of tissue comprising a flexible elongate member having proximal and distal extremities and a lumen in the distal extremity, a conducting metal tip electrode secured to the distal extremity of the flexible elongate member and having a proximal extremity and a distal extremity in the form of a rounded tip, the tip electrode having a chamber therein which is in communication with the lumen, conductor means extending through the flexible elongate member for supplying radio frequency energy to the tip electrode, cooling means disposed in the chamber in contact with the tip electrode for dissipating heat created in the tip electrode by the application of radio frequency energy thereto, a layer of insulating material extending over at least the proximal extremity of the tip electrode, a conducting metal ring electrode secured to the distal extremity of the flexible elongate member proximal of the tip electrode, the ring electrode having a chamber therein and proximal and distal extremities, cooling means disposed in the chamber in contact with the ring electrode and first and second additional layers of insulating material extending respectively over the proximal and distal extremities of the ring electrode.
A catheter for radio frequency ablation of tissue comprising a flexible elongate member having proximal and distal extremities and a lumen in the distal extremity, a conducting metal ring electrode secured to the distal extremity of the flexible elongate member and having proximal and distal extremities, the ring electrode having a chamber therein which is in communication with the lumen, conductor means extending through the flexible elongate member for supplying radio frequency energy to the ring electrode, cooling means disposed in the chamber in contact with the ring electrode for dissipating heat created in the ring electrode by the application of radio frequency energy thereto, a layer of insulating material. extending over at least the proximal extremity of the ring electrode and an additional layer of insulating material. extending over at least the distal extremity of the ring electrode.
Dependencies are inferred from the claim text.