TISSUE ABLATION APPARATUS AND METHOD

• US 20080287944A1
• Filed: 01/30/2008
• Published: 11/20/2008
• Est. Priority Date: 09/28/2001
• Status: Abandoned Application

• Current Assignee: AngioDynamics, Inc.
• Original Assignee: AngioDynamics, Inc.
• Inventors: Yassinzadeh, Zia, Balbierz, Daniel J., Daniel, Steven A., Johnson, Theodore C., PEARSON, ROBERT M.
• Application Number:
  US12/022,708
• Publication Number:
  US 20080287944A1
• Time in Patent Office: Days
• US Class Current: 606/41
• CPC Class Codes: A61B 18/1477 Needle-like probes
• CPC Class Codes: A61B 2018/00011 with fluids
• CPC Class Codes: A61B 2018/00083 low, i.e. electrically insulating
• CPC Class Codes: A61B 2018/00196 reciprocating lengthwise
• CPC Class Codes: A61B 2018/00577 Ablation
• CPC Class Codes: A61B 2018/00702 Power or energy
• CPC Class Codes: A61B 2018/00726 Duty cycle
• CPC Class Codes: A61B 2018/00738 Depth, e.g. depth of ablation
• CPC Class Codes: A61B 2018/00744 Fluid flow
• CPC Class Codes: A61B 2018/0075 Phase
• CPC Class Codes: A61B 2018/00755 Resistance or impedance
• CPC Class Codes: A61B 2018/00761 Duration
• CPC Class Codes: A61B 2018/00791 Temperature
• CPC Class Codes: A61B 2018/00869 Phase
• CPC Class Codes: A61B 2018/00875 Resistance or impedance
• CPC Class Codes: A61B 2018/124 switching the output to different electrodes, e.g. sequentially
• CPC Class Codes: A61B 2018/1253 monopolar
• CPC Class Codes: A61B 2018/1425 Needle
• CPC Class Codes: A61B 2018/143 multiple needles
• CPC Class Codes: A61B 2018/1432 curved
• CPC Class Codes: A61B 2218/002 : Irrigation

Abstract

A method and apparatus for carrying our thermal ablation of target tissue is disclosed. The apparatus includes an RF ablation device having a multi-electrode electrode assembly designed to be deployed in target tissue, defining a selected-volume tissue region to be ablated, and having infusion channels for infusing a liquid into the target tissue during the ablation process. A control unit in the apparatus is operably connected to an RF energy source, for controlling the RF power level supplied to the electrodes, and to an infusion device, for controlling the rate of infusion of a liquid through the device into the tissue. During both electrode deployment and tissue ablation, impedance and or temperature measurements made within the tissue are used to control the RF source and infusion device, for optimizing the time and extent of tissue ablation.

Claims

1. An apparatus for tissue ablation, comprising:

an elongated delivery device;

an energy delivery device operably coupled to an energy source, the energy delivery device comprising a plurality of electrodes, each of the electrodes having a tissue piercing distal portion and being positionable in the elongated delivery device, one or more of the electrodes configured to be curved when deployed to a selected tissue site, two or more of the electrodes being configured for liquid infusion to the selected tissue site and each separately comprising an infusion lumen;

an energy control configured to be operably coupled to the energy delivery device for impedance detection within the selected tissue site, and for energy delivery control in response to the detected impedance; and

a fluid control configured to be operably coupled to the at least two infusion electrodes for infusion control in response to the detected impedance.