Multiple antenna ablation apparatus and method

• US 5,672,173 A
• Filed: 12/19/1995
• Issued: 09/30/1997
• Est. Priority Date: 08/15/1995
• Status: Expired due to Term

• Current Assignee: AngioDynamics, Inc.
• Original Assignee: Rita Medical Systems Incorporated (AngioDynamics, Inc.)
• Inventors: Gough, Edward J., Stein, Alan A.
• Primary Examiner(s): Bahr, Jennifer
• Assistant Examiner(s): PEFFLEY, MICHAEL F
• Application Number:
  US08/576,436
• Time in Patent Office: 651 Days
• Field of Search: 606/41, 606/42, 606/45-50, 607/100-102, 607/154, 607/156, 128/642
• US Class Current: 606/41
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 18/14 Probes or electrodes therefor
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 18/1477 Needle-like probes
• CPC Class Codes: A61B 18/1482 having a long rigid shaft for accessing the inner body transcutaneously in minimal invasive surgery, e.g. laparoscopy
• CPC Class Codes: A61B 18/1485 having a short rigid shaft for accessing the inner body through natural openings
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• 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 2017/00022 Sensing or detecting at the treatment site
• CPC Class Codes: A61B 2017/00101 using an array of thermosensors
• CPC Class Codes: A61B 2018/00011 with fluids
• CPC Class Codes: A61B 2018/00023 closed, i.e. without wound contact by the fluid
• CPC Class Codes: A61B 2018/00196 reciprocating lengthwise
• CPC Class Codes: A61B 2018/00273 Anchoring means for temporary attachment of a device to tissue
• CPC Class Codes: A61B 2018/00452 Skin
• CPC Class Codes: A61B 2018/00476 Hair follicles
• CPC Class Codes: A61B 2018/00577 Ablation
• CPC Class Codes: A61B 2018/00666 using a threshold value
• CPC Class Codes: A61B 2018/00678 upper
• CPC Class Codes: A61B 2018/00702 : Power or energy
• CPC Class Codes: A61B 2018/00708 : switching the power on or off
• CPC Class Codes: A61B 2018/00726 : Duty cycle
• CPC Class Codes: A61B 2018/00744 : Fluid flow
• CPC Class Codes: A61B 2018/00761 : Duration
• CPC Class Codes: A61B 2018/00779 : Power or energy
• CPC Class Codes: A61B 2018/00791 : Temperature
• CPC Class Codes: A61B 2018/00797 : measured by multiple temperature sensors
• CPC Class Codes: A61B 2018/00827 : Current
• CPC Class Codes: A61B 2018/00875 : Resistance or impedance
• CPC Class Codes: A61B 2018/00892 : Voltage
• 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 2018/126 : bipolar
• 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 2018/1435 : Spiral
• CPC Class Codes: A61B 2018/1472 : for use with liquid electrolyte, e.g. virtual electrodes
• CPC Class Codes: A61B 2018/162 : located on the probe body
• CPC Class Codes: A61B 2218/002 : Irrigation
• CPC Class Codes: A61M 25/007 : Side holes, e.g. their profiles or arrangements; Provisions to keep side holes unblocked
• CPC Class Codes: A61M 3/0279 : Cannula; Nozzles; Tips; their connection means
• CPC Class Codes: A61N 1/06 : for high-frequency therapy
• CPC Class Codes: A61N 1/403 : for thermotherapy, e.g. hyperthermia
• CPC Class Codes: A61N 5/04 : Radiators for near-field treatment

Abstract

An ablation treatment apparatus has a multiple antenna device with a primary antenna and a secondary antenna. The secondary antenna is positioned in a lumen of the primary antenna as the primary antenna is introduced through tissue to a selected tissue site. At the tissue site the secondary antenna is deployed from the primary antenna in a lateral direction relative to a longitudinal axis of the primary antenna. At least a portion of a distal end of the secondary antenna is structurally less rigid than the primary antenna. The primary antenna is constructed to be rigid enough to be introduced and advanced through tissue. A cable couples the energy source to one or more of the antennas.

Claims

1. An ablation treatment apparatus, comprising:

a multiple antenna device configured to be coupled to an energy source and including a primary antenna with a lumen, a distal end sufficiently sharp to pierce tissue and a longitudinal axis, and a secondary antenna including a distal portion and at least partially positioned in the primary antenna as the primary antenna is introduced through tissue, at least a part of the distal portion is configured to be deployed from the primary antenna in a lateral direction relative to the longitudinal axis at a selected tissue mass with at least one radius of curvature, at least a portion of a distal end of the secondary antenna is constructed to be structurally less rigid than the primary antenna, and the primary antenna is constructed to be rigid enough to be introduced through tissue; and

at least one cable coupling the multiple antenna device to the energy source.

2. The apparatus of claim 1, wherein the primary antenna has an ablation surface with a length that is at least 20% of a length of an ablation surface of the secondary antenna.

3. The apparatus of claim 1, wherein the primary antenna has an ablation surface with a length that is at least one-third of a length of an ablation surface of the secondary antenna.

4. The apparatus of claim 1, wherein the primary antenna has an ablation surface with a length that is at least one-half of a length of an ablation surface of the secondary antenna.

5. The apparatus of claim 1, wherein two secondary antennas are provided and laterally deployed from the primary antenna, each of the primary and secondary antennas having an ablation surface to create an ablation volume between the ablation surfaces.

6. The apparatus of claim 1, wherein three secondary antennas are provided and laterally deployed from the primary antenna, each of the primary and secondary antennas having an ablation surface to create an ablation volume between the ablation surfaces.

7. The apparatus of claim 1, further comprising:

an insulation sleeve positioned in a surrounding relationship around at least a portion of an exterior of the primary antenna.

8. The apparatus of claim 7, wherein the insulation sleeve is adjustably moveable along an exterior of the primary antenna.

9. The apparatus of claim 1, further comprising:

an insulation sleeve positioned in a surrounding relationship around at least a portion of an exterior of the secondary antenna.

10. The apparatus of claim 9, wherein the insulation sleeve is adjustably moveable along an exterior of the secondary antenna.

11. The apparatus of claim 1, further including a ground pad electrode with the primary and secondary antennas operating in a monopolar mode.

12. The apparatus of claim 1, wherein the primary and secondary antennas are RF antennas.

13. The apparatus of claim 1, wherein the primary and secondary antennas are microwave antennas.

14. The apparatus of claim 1, wherein the apparatus is switchable between bipolar and monopolar operation.

15. The apparatus of claim 1, wherein the primary antenna is hollow and coupled to an infusion medium source to receive an infusion medium.

16. A method for creating an ablation volume in a selected tissue mass, comprising:

providing an ablation device with a primary antenna, a secondary antenna with a distal end, and an energy source coupled to one or both of the antennas, wherein at least a distal end of the secondary antenna is structurally less rigid than the primary antenna, the primary antenna having a distal end sufficiently sharp to pierce tissue and the secondary antenna including a distal portion with at least a portion of the distal portion configured to be deployed from the primary antenna with at least one radius of curvature;

inserting the primary antenna into the selected tissue mass with the secondary antenna distal end positioned in the primary antenna lumen;

advancing the secondary antenna distal end out of the primary antenna lumen and into the selected tissue mass in a lateral direction relative to a longitudinal axis of the primary antenna;

delivering electromagnetic energy from one of a primary antenna ablation surface, a secondary antenna ablation surface or both to the selected tissue mass; and

creating an ablation volume in the selected tissue mass.

17. The method of claim 16, wherein two secondary antennas, each having an ablation surface, are advanced from the primary antenna, and an ablation volume is created between the two secondary antennas ablation surfaces and the primary electrode ablation surface.

18. The method of claim 17, wherein the two secondary antennas are advanced out of a distal end of the primary antenna.

19. The method of claim 17, wherein the two secondary antennas are advanced out of separate ports formed in the primary antenna.

20. The method of claim 17, wherein the two secondary antennas are advanced from the primary antenna and define a plane.

21. The method of claim 16, wherein three secondary antennas are advanced from the primary antenna.

22. The method of claim 21, wherein each of the three secondary antennas and the primary antenna has an ablation surface, and an ablation volume is formed between the ablation surfaces of the antennas.

23. The method of claim 16, wherein the primary electrode has an ablation surface that is at least equal to 20% or more of an ablation surface of the secondary antenna.

24. The method of claim 16, wherein the primary electrode has an ablation surface that is at least equal to one-third or more of an ablation surface of the secondary antenna.

25. The method of claim 16, wherein the primary electrode has an ablation surface that is at least equal to one-half or more of an ablation surface of the secondary antenna.

26. The method of claim 16, wherein the primary and secondary antennas are operated in a monopolar mode.

27. The method of claim 16, wherein the ablation device is operated in a bipolar mode.