Tissue ablation systems and methods of use

• US 8,900,223 B2
• Filed: 11/08/2010
• Issued: 12/02/2014
• Est. Priority Date: 11/06/2009
• Status: Active Grant

• Current Assignee: Tsunami MedTech, LLC
• Original Assignee: Tsunami MedTech, LLC
• Inventors: Shadduck, John H.
• Primary Examiner(s): Dvorak, Linda
• Assistant Examiner(s): SCOTT, AMANDA L
• Application Number:
  US12/941,778
• Publication Number:
  US 20110118717A1
• Time in Patent Office: 1,485 Days
• Field of Search: 606 27- 32, 606/41
• US Class Current: 606/27
• CPC Class Codes: A61B 18/04 by heating by applying electromagnetic radiation A61B18/18; hyperthermia using electric or magnetic fields, radiation or ultrasound A61N
• CPC Class Codes: A61B 18/1477 Needle-like probes
• CPC Class Codes: A61B 2018/00434 Neural system
• CPC Class Codes: A61B 2018/00589 Coagulation
• CPC Class Codes: A61B 2018/00601 Cutting
• CPC Class Codes: A61B 2018/048 in gaseous form
• CPC Class Codes: A61B 2018/1412 Blade

Abstract

This invention relates to medical instruments and systems for applying energy to tissue. Variations of the systems and methods described herein include ablating, sealing, and extracting tissue with high pressure flows of fluids that in part utilizes a vapor-to-liquid phase change of flow media to apply thermal energy to the tissue.

Claims

1. A method of treating tissue, the comprising:

positioning a probe working end in an interface with tissue;

ejecting a high pressure flow of flow media from a working end outlet, wherein the flow comprises at least in a part a condensable vapor, and wherein the flow has a selected pressure and velocity that disintegrates tissue; and

controllably rotating the working end at a selected speed to control the depth of disintegration of tissue proximate the outlet.

2. The method of claim 1 wherein the high pressure flow is jetted from a plurality of outlets at or along the working end.

3. The method of claim 1 wherein the flow media is selected from the group of water vapor, atomized water droplets, water and a pharmacological agent.

4. The method of claim 1 wherein the working end is rotated so that tissue is disintegrated to a depth of less than 1 mm for each 360°

revolution of the outlet.

5. The method of claim 1 wherein the working end is rotated so that tissue is disintegrated to a depth of less than 0.5 mm for each 360°

revolution of the outlet.

6. The method of claim 1 wherein the working end is rotated at a rate so that tissue is disintegrated to a depth of less than 0.1 mm for each 360°

revolution of the outlet.

7. The method of claim 1 wherein the working end is rotated at a rate so that tissue is disintegrated to a depth of less than 1 mm for each 360°

revolution of the outlet.

8. The method of claim 1 wherein the working end is rotated at a rate so that tissue is disintegrated to a depth of less than 0.5 mm for each 360°

revolution of the outlet.

9. The method of claim 1 wherein the working end is rotated at a rate so that tissue is disintegrated to a depth of less than 0.1 mm for each 360°

revolution of the outlet.

10. The method of claim 1 wherein the working;

end is rotated between a rate of 10 rpm to 10,000 rpm.

11. The method of claim 1 further comprising removing disintegrated tissue through an aspiration port communicating with an aspiration channel in the probe.

12. The method of claim 1 wherein the condensable vapor applies heat to seal tissue.

13. The method of claim 1 wherein the working end has a longitudinal axis and flow media is ejected at an angle relative to the axis.

14. A method of tissue ablation, comprising:

positioning a probe working end in an interface with a tissue volume containing first and second tissue types;

ejecting at least one high pressure flow of flow media from the probe working end, wherein a flow comprises at least in a part a condensable vapor that applies energy capable of sealing tissue, wherein the flow has a selected pressure and velocity that applies energy that discriminates disintegration of tissue between the first and second tissue types,

moving the working end axially and/or rotationally contemporaneous with ejecting flow media; and

removing disintegrated tissue through an aspiration port communicating with an aspiration channel in the probe.

15. The method of claim 14 wherein at least two flow of different flow media are ejected from the working end.

16. The method of claim 15 wherein different flow media are selected from the group of water vapor, atomized water droplets, water and a pharmacological agent.

17. The method of claim 14 wherein the flow media is ejected from a plurality of outlets in the working end.

18. The method of claim 14 wherein the flow media is ejected from at least one outlet that is recessed within, the aspiration port.

19. The method of claim 14 wherein the flow media is pulsed.

20. The method of claim 14 wherein a computer controller and motor controllably moves the working end.

21. The method of claim 14 wherein a computer controller controls parameters of the ejection of flow media.

22. The method of claim 14 further comprising imaging the flow of flow media.