Patent ID: 7318822
Filing Date: 2008-01-15
Classification: A61B

Abstract:
1. A cannula comprising: (a) a hollow metal tube having a base end and a free tip, and an internal passage extending from the base end to the tip, (b) an insulation layer covering a majority of the length of said tube but not covering said tip and thereby leaving said tip exposed, (c) a temperature sensor wire extending along said tube from said base to a position adjacent said tip, said wire being insulated from said tube along the length of said tube but being electrically connected to a temperature sensor adjacent said tip, said temperature sensor also being connected to said tube so that said tube and said wire form two conductors of a circuit for said temperature sensor, (d) said wire being within said insulation layer, so that said cannula can be inserted into a patient and a liquid can be injected through said passage into said patient, and so that RF energy can be applied through said cannula while the temperature adjacent said tip is sensed by said temperature sensor, (e) said tube having an outer surface having a crease therein extending longitudinally along said tube, said wire being located in said crease, and said crease and said wire being covered by said insulation layer.