Medical device

Abstract

Provided is a medical device comprising an inner tubular member, an outer tubular member having a distal end and an open window disposed at the distal end, a first electrode and/or a second electrode disposed at the distal end of the outer tubular member, and a cannulated plunger or armature or shaft configured to drive the inner tubular member to cut tissue in cooperation with the open window of the outer tubular member wherein the first electrode and the second electrode are configured to provide RF energy needed for surgical operation and wherein the first and the second electrodes may be configured to be symmetrical or substantially symmetrical along a longitudinal axis of the outer tubular member or wherein the first electrode is configured to cover the open window of the outer tubular member and extended to one side of the outer tubular member and the second electrode is configured to be disposed on the other side of the outer tubular member. Also provided are methods of making a medical device as described herein.

1 . (canceled) 
     
     
         2 . A medical device comprising:
 a tubular member extending along a longitudinal axis from a proximal end to a distal end, a top side of the tubular member including an open window disposed at the distal end;   a first electrode disposed at the distal end of the tubular member and surrounding the open window of the tubular member or its neighboring region;   an insulation zone surrounding the first electrode; and   a second electrode surrounding the insulation zone, the second electrode including an expanded head portion on a bottom side of the tubular member.   
     
     
         3 . The medical device of  claim 2 , wherein the second electrode further includes a runner that extends proximally on an outer surface of the tubular member. 
     
     
         4 . The medical device of  claim 3 , wherein the runner extends toward the proximal end of the tubular member in a direction substantially parallel to the longitudinal axis. 
     
     
         5 . The medical device of  claim 4 , wherein the head portion bifurcates from the runner at a location proximal to the open window. 
     
     
         6 . The medical device of  claim 2 , wherein the open window of the tubular member is substantially symmetrical along the longitudinal axis of the tubular member. 
     
     
         7 . The medical device of  claim 2 , wherein the first electrode is substantially symmetrical along the longitudinal axis of the tubular member. 
     
     
         8 . The medical device of  claim 2 , wherein the second electrode is substantially symmetrical along the longitudinal axis of the tubular member. 
     
     
         9 . The medical device of  claim 2 , wherein the insulation zone is substantially symmetrical along the longitudinal axis of the tubular member. 
     
     
         10 . The medical device of  claim 2 , further comprising an inner tubular member configured to be received within the tubular member. 
     
     
         11 . The medical device of  claim 10 , wherein the inner tubular member has an open distal end. 
     
     
         12 . The medical device of  claim 11 , wherein the open distal end of the inner tubular member and the open window of the tubular member are configured to form a cutting tool during an operation of the medical device. 
     
     
         13 . The medical device of  claim 10 , wherein the inner tubular member has a distal end and an open window disposed at the distal end. 
     
     
         14 . A medical device comprising:
 a tubular member extending along a longitudinal axis from an open proximal end to a closed distal end, the tubular member including an open window disposed at the distal end;   a first electrode surrounding the open window of the tubular member or its neighboring region;   an insulation zone surrounding the first electrode; and   a second electrode surrounding the insulation zone, the second electrode including an expanded conductive area on a side of the tubular member opposite to the open window.   
     
     
         15 . The medical device of  claim 14 , wherein the second electrode is disposed on a dielectric layer. 
     
     
         16 . The medical device of  claim 14 , wherein both the first electrode and the second electrode are substantially symmetrical along the longitudinal axis of the tubular member. 
     
     
         17 . The medical device of  claim 14 , wherein both the first electrode and the second electrode are asymmetrical along the longitudinal axis of the tubular member. 
     
     
         18 . The medical device of  claim 14 , further comprising an inner tubular member configured to be received within the tubular member. 
     
     
         19 . A medical device comprising:
 an outer tubular member extending along a longitudinal axis from a proximal end to a distal end, the outer tubular member including an open window disposed at the distal end;   an inner tubular member configured to be received within the outer tubular member;   a first electrode disposed at the distal end of the outer tubular member and surrounding the open window of the outer tubular member or its neighboring region;   an insulation zone surrounding the first electrode; and   a second electrode surrounding the insulation zone;   wherein the second electrode surrounds the insulation zone by connecting bifurcated segments of the second electrode at a location proximal to the open window.   
     
     
         20 . The medical device of  claim 19 , wherein the second electrode is disposed on a dielectric layer. 
     
     
         21 . The medical device of  claim 19 , wherein the second electrode includes an expanded conductive area.