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Radio frequency ablation device for the destruction of tissue masses

  • US 8,080,009 B2
  • Filed: 07/01/2005
  • Issued: 12/20/2011
  • Est. Priority Date: 07/01/2005
  • Status: Active Grant
First Claim
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1. An ablation instrument, comprising:

  • (a) an elongated cannula having a proximal portion and a distal portion, said cannula defining an internal lumen within said cannula, and said cannula defining a cannula axis;

    (b) at least one conductor extending along at least a portion of the length of said lumen, said conductor having a proximal portion proximate the proximal portion of said cannula, and a distal portion proximate the distal portion of said cannula;

    (c) a plurality of ablation stylets each having a proximal portion and a distal portion, each of said stylets coupled at the respective proximal portion of each of said stylets to the distal portion of said conductor, said stylets comprising a resiliently deflectable material, said conductor together with said stylets being mounted for axial movement along at least a portion of said conductor and said stylets, said ablation stylets having a substantially straight configuration in the absence of the application of external forces;

    (d) a head positioned proximate to the distal portion of said cannula, said head being secured proximate the distal portion of said cannula, said head having a proximal portion and a distal portion, and said distal portion of said head comprising a head end; and

    (e) deflection surfaces positioned between said head and said proximal portion of said cannula, said deflection surface being positioned closer to said head end, the deflection surfaces each being configured and positioned, in response to axial movement of said stylets, to deflect at least some of said stylets laterally and only outwardly along paths which extend away from said cannula axis causing said stylets to exit said deflection surfaces and move along substantially straight external paths external to said cannula and head, deflection by said deflection surfaces achieving most of the deflection in the path of the stylets;

    wherein said head end is defined at the distal end of a trocar member, said trocar member having an outside surface, and said cannula having an outside surface, said trocar member having a proximal end secured proximate to the distal end of said elongated cannula and a distal end which a defines a trocar point; and

    wherein said deflection surface comprises a number of open grooves defined proximate the proximal end of said trocar point, the distal ends of said stylets being positionable proximate to said grooves and at least partially within said trocar.

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