Targeted cooling of deployable microwave antenna with cooling chamber

• US 8,655,454 B2
• Filed: 07/18/2013
• Issued: 02/18/2014
• Est. Priority Date: 11/27/2007
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Prakash, Mani N., Nguyen, Tao, Rusin, Christopher T.
• Primary Examiner(s): Dvorak, Linda
• Assistant Examiner(s): ANTISKAY, BRIAN MICHAEL
• Application Number:
  US13/945,519
• Publication Number:
  US 20130304056A1
• Time in Patent Office: 215 Days
• Field of Search: 600/425, 600/434, 606/33, 606/41, 606/50, 607/101
• US Class Current: 607/101
• CPC Class Codes: A61B 18/18 by applying electromagnetic radiation, e.g. microwaves radiation therapy A61N5/00
• CPC Class Codes: A61B 18/1815 using microwaves
• CPC Class Codes: A61B 2018/00005 Cooling or heating of the probe or tissue immediately surrounding the probe

Abstract

The present disclosure relates to devices and methods for the treatment of tissue with microwave energy. The devices and methods disclosed herein utilize an antenna assembly which includes an elongate member, an outer conductor, an inner conductor, at least a portion of which is deployable, and a cooling system. The cooling system disclosed herein may significantly curtail any theoretical, or potential negative effects upon the target tissue experienced during the transmission of microwave energy to the antenna assembly due to ohmic heating.

Claims

1. A microwave ablation probe, comprising:

a tubular elongated member defining a longitudinal axis and having proximal and distal ends and inner and outer surfaces, the tubular elongated member further including a plurality channels defined in the inner surface thereof;

an outer conductor disposed along the longitudinal axis within the tubular elongated member;

a dielectric material disposed coaxially within the outer conductor;

an antenna disposed coaxially within the dielectric material, the antenna extending distally from a distal end of the outer conductor, the antenna comprising;

an inner conductor disposed coaxially within the dielectric material; and

a cooling sleeve disposed coaxially about a distal portion of the inner conductor having a cooling chamber defined therein;

at least one inflow conduit in fluid communication with the cooling chamber and configured to deliver coolant thereto; and

at least one outflow conduit in fluid communication with the cooling chamber and configured to remove coolant therefrom.

2. The microwave ablation probe according to claim 1, wherein the plurality of channels are defined along the longitudinal axis of the tubular elongated member.

3. The microwave ablation probe according to claim 1, wherein at least one of the plurality of channels is configured to receive the at least one inflow conduit.

4. The microwave ablation probe according to claim 1, wherein at least one of the plurality of channels is configured to receive the at least one outflow conduit.

5. The microwave ablation probe according to claim 1, wherein the cooling chamber includes a baffle radially separating the cooling chamber into a first cooling region and a second cooling region.

6. The microwave ablation probe in accordance with claim 5, wherein the at least one inflow conduit includes a first inflow conduit in fluid communication with the first cooling region and a second inflow conduit in fluid communication with the second cooling region;

and the at least one outflow conduit includes a first outflow conduit in fluid communication with the first cooling region and a second outflow conduit in fluid communication with the second cooling region.

7. The microwave ablation probe in accordance with claim 1, further including at least one temperature sensor configured to sense a temperature of the antenna.

8. The microwave ablation probe in accordance with claim 1, wherein the cooling sleeve is formed from a substantially rigid material.

9. The microwave ablation probe in accordance with claim 1, wherein the cooling sleeve is formed from a substantially non-rigid material.

10. A microwave ablation probe, comprising:

a tubular elongated member defining a longitudinal axis and having proximal and distal ends and inner and outer surfaces, the tubular elongated member including a plurality of channels defined in the inner surface thereof;

an outer conductor disposed along the longitudinal axis within the tubular elongated member;

a dielectric material disposed coaxially within the outer conductor;

an inner conductor disposed coaxially within the dielectric material;

an antenna disposed coaxially within the elongated member and wherein the antenna member extends distally from the elongated member, the antenna assembly including a cooling sleeve having a plurality of cooling chambers disposed coaxially about the inner conductor;

a plurality of inflow conduits disposed within at least one of the plurality of channels, each one of the plurality of inflow conduits in fluid communication with a corresponding one of the plurality of cooling chambers;

a plurality of outflow conduits disposed within at least one of the plurality of channels, each one of the plurality of outflow conduits in fluid communication with a corresponding one of the plurality of cooling chambers; and

a plurality of temperature sensors, each one of the plurality of temperature sensors associated with a corresponding one of the plurality of cooling chambers and configured to sense a temperature thereof.

11. The microwave ablation probe in accordance with claim 10, wherein the plurality of cooling chambers are separated by at least one baffle radially positioned therebetween.

12. The microwave ablation probe in accordance with claim 11, wherein the baffle is configured to substantially prevent fluid communication between the plurality of cooling chambers.

13. The microwave ablation probe in accordance with claim 10, wherein a first of the plurality of cooling chambers includes a first longitudinal dimension and a second of the plurality of cooling chambers includes a second longitudinal dimension that is different from the first longitudinal dimension.

14. The microwave ablation probe in accordance with claim 10, wherein a first of the plurality of cooling chambers includes a first radial dimension and a second of the plurality of cooling chambers includes a second radial dimension that is different from the first radial dimension.