90-degree interlocking geometry for introducer for facilitating deployment of microwave radiating catheter

Abstract

A microwave ablation system includes a first cannula, a trocar insertable through the first cannula and configured to facilitate insertion of the first cannula into a target tissue, and a microwave antenna assembly configured to interlock with the first cannula, the microwave antenna assembly including a coaxial feedline having a radiating section formed thereon, the microwave antenna configured to be inserted into the first cannula. The microwave ablation system further includes an actuator operatively connected to one of the first cannula or microwave antenna assembly. Operation of the actuator between a first position and a second position exposes the radiating section of the microwave antenna assembly from a distal portion of the first cannula.

1 - 20 . (canceled) 
     
     
         21 . A microwave ablation assembly, comprising:
 a microwave antenna assembly configured to deliver microwave energy to tissue;   a multi-lumen hub configured to receive a fluid for cooling the microwave antenna assembly, the multi-lumen hub having an upper body portion defining a fluid chamber and a lower body portion disposed distal to the upper body portion and housing a proximal end portion of the microwave antenna assembly, the multi-lumen hub and the microwave antenna assembly defining a first longitudinal axis, the multi-lumen hub including:
 a fluid inflow port in fluid communication with the fluid chamber; and 
 a fluid outflow port in fluid communication with the microwave antenna assembly; 
   a microwave transmission cable assembly defining a second longitudinal axis substantially perpendicular to the first longitudinal axis, the microwave transmission cable assembly configured to electrically couple the microwave antenna assembly to a microwave generator; and   a transition head connecting the microwave transmission cable assembly to the microwave antenna assembly, the transition head having:
 a first section extending along the first longitudinal axis and housed within the fluid chamber defined by the upper body portion of the multi-lumen housing; and 
 a second section coupled to a distal end portion of the microwave transmission cable assembly and extending along the second longitudinal axis such that the first and second sections are substantially perpendicular to each other. 
   
     
     
         22 . The microwave ablation assembly according to  claim 21 , wherein the fluid inflow port and the fluid outflow port extend substantially parallel to the second longitudinal axis. 
     
     
         23 . The microwave ablation assembly according to  claim 21 , wherein the first section of the transition head includes an o-ring configured to fluidly seal the fluid chamber defined by the upper body of the multi-lumen hub. 
     
     
         24 . The microwave ablation assembly according to  claim 21 , wherein the second section houses an electrical connector configured to electrically couple the microwave transmission cable assembly to the microwave antenna assembly. 
     
     
         25 . The microwave ablation assembly according to  claim 21 , wherein the fluid chamber defined by the upper body of the multi-lumen hub is in fluid communication with the microwave antenna assembly. 
     
     
         26 . The microwave ablation assembly according to  claim 21 , wherein the microwave antenna assembly includes a coaxial feedline having a radiating section at a distal end portion of the coaxial feedline. 
     
     
         27 . The microwave ablation assembly according to  claim 21 , further comprising an actuator disposed around at least a portion of the multi-lumen hub such that the fluid inflow port and the fluid outflow port extend through an opening defined through an outer surface of the actuator, the actuator movable to expose a radiating section of the microwave antenna assembly to tissue. 
     
     
         28 . A microwave ablation assembly, comprising:
 a microwave antenna assembly configured to deliver microwave energy to tissue;   a multi-lumen hub configured to receive a fluid for cooling the microwave antenna assembly and housing a proximal end portion of the microwave antenna assembly, the multi-lumen hub and the microwave antenna assembly defining a first longitudinal axis;   a microwave transmission cable assembly defining a second longitudinal axis substantially perpendicular to the first longitudinal axis, the microwave transmission cable assembly configured to electrically couple the microwave antenna assembly to a microwave generator; and   a transition head connecting the microwave transmission cable assembly to the microwave antenna assembly, the transition head including:
 a first section extending along the first longitudinal axis; and 
 a second section coupled to a distal end portion of the microwave transmission cable assembly and extending along the second longitudinal axis such that the first and second sections are substantially perpendicular to each other. 
   
     
     
         29 . The microwave ablation assembly according to  claim 28 , wherein the multi-lumen hub includes a fluid inflow port extending substantially parallel to the second longitudinal axis and a fluid outflow port extending substantially parallel to the second longitudinal axis. 
     
     
         30 . The microwave ablation assembly according to  claim 28 , wherein the first section of the transition head includes an o-ring configured to fluidly seal a fluid chamber defined within the multi-lumen hub. 
     
     
         31 . The microwave ablation assembly according to  claim 28 , wherein the second section of the transition head houses an electrical connector configured to electrically couple the microwave transmission cable assembly to the microwave antenna assembly. 
     
     
         32 . The microwave ablation assembly according to  claim 28 , wherein the multi-lumen hub includes an upper body portion defining a fluid chamber and a lower body portion disposed distal to the upper body portion and housing the proximal end portion of the microwave antenna assembly. 
     
     
         33 . The microwave ablation assembly according to  claim 32 , wherein the fluid chamber defined by the upper body portion of the multi-lumen hub is in fluid communication with the microwave antenna assembly. 
     
     
         34 . The microwave ablation assembly according to  claim 28 , wherein the microwave antenna assembly includes a coaxial feedline having a radiating section at a distal end portion of the coaxial feedline. 
     
     
         35 . The microwave ablation assembly according to  claim 28 , further comprising an actuator disposed around at least a portion of the multi-lumen hub and movable to expose a radiating section of the microwave antenna assembly to tissue. 
     
     
         36 . A microwave ablation assembly, comprising:
 a microwave antenna assembly configured to deliver microwave energy to tissue;   a multi-lumen hub housing a proximal end portion of the microwave antenna assembly and configured to receive a fluid for cooling the microwave antenna assembly, the multi-lumen hub and the microwave antenna assembly defining a first longitudinal axis, the multi-lumen hub including:
 a fluid inflow port extending substantially perpendicular to the first longitudinal axis; and 
 a fluid outflow port in fluid communication with the microwave antenna assembly and extending substantially perpendicular to the first longitudinal axis; and 
   a microwave transmission cable assembly defining a second longitudinal axis substantially perpendicular to the first longitudinal axis, the microwave transmission cable assembly configured to electrically couple the microwave antenna assembly to a microwave generator.   
     
     
         37 . The microwave ablation assembly according to  claim 36 , further comprising a transition head connecting the microwave transmission cable assembly to the microwave antenna assembly, the transition head including:
 a first section housed within the multi-lumen housing and extending along the first longitudinal axis; and   a second section extending along the second longitudinal axis such that the first and second sections are substantially perpendicular to each other, the second section coupled to a distal end portion of the microwave transmission cable assembly.   
     
     
         38 . The microwave ablation assembly according to  claim 37 , wherein the first section of the transition head is received within a fluid chamber defined by the multi-lumen housing. 
     
     
         39 . The microwave ablation assembly according to  claim 36 , wherein the multi-lumen hub includes an upper body portion defining a fluid chamber in fluid communication with the fluid inflow port and a lower body portion disposed distal to the upper body portion and housing the proximal end portion of the microwave antenna assembly. 
     
     
         40 . The microwave ablation assembly according to  claim 38 , wherein the fluid chamber defined by the upper body portion of the multi-lumen housing is in fluid communication with the microwave antenna assembly.