RF TREATMENT APPARATUS

• US 20020035363A1
• Filed: 07/30/1999
• Published: 03/21/2002
• Est. Priority Date: 11/08/1993
• Status: Active Grant

• Current Assignee: AngioDynamics, Inc.
• Original Assignee: Rita Medical Systems Incorporated (AngioDynamics, Inc.)
• Inventors: BAKER, JAMES, EDWARDS, STUART D., STRUL, BRUNO, LAX, RONALD G.
• Granted Patent: US 6,663,624 B2
• Time in Patent Office: Days
• 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 18/1492 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 2017/00026 Conductivity or impedance, e.g. of tissue
• CPC Class Codes: A61B 2017/00084 Temperature
• CPC Class Codes: A61B 2018/00011 with fluids
• CPC Class Codes: A61B 2018/00196 reciprocating lengthwise
• 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 2018/00642 with feedback, i.e. closed loop control
• 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 2018/00761 : Duration
• CPC Class Codes: A61B 2018/00779 : Power or energy
• CPC Class Codes: A61B 2018/00791 : Temperature
• CPC Class Codes: A61B 2018/00821 : measured by a thermocouple
• 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 2018/1435 : Spiral
• CPC Class Codes: A61B 2018/162 : located on the probe body
• CPC Class Codes: A61B 2018/1861 : with an instrument inserted into a body lumen or cavity, e.g. a catheter
• 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: A61N 5/02 : using microwaves
• CPC Class Codes: A61N 5/04 : Radiators for near-field treatment
• CPC Class Codes: A61N 5/045 : specially adapted for treatment inside the body

Abstract

An RF treatment apparatus includes a catheter with a catheter lumen. A removable needle electrode is positioned in the catheter lumen in a fixed relationship to the catheter. The needle electrode includes a needle lumen and a needle electrode distal end. A removable introducer is slidably positioned in the needle lumen. The introducer includes an introducer distal end. A first sensor is positioned on a surface of the needle electrode or the insulator. An RF power source is coupled to the needle electrode and a return electrode. An insulator sleeve is slidably positioned around the electrode and includes a second sensor. Resources are associated with the electrodes, sensors as well as the RF power source for maintaining a selected power at the electrode independent of changes in current or voltage.

Claims

1. An RF treatment apparatus, comprising:

a catheter including a catheter lumen;

a removable needle electrode positioned in the catheter lumen in a fixed relationship to the catheter, the treatment needle electrode including a needle lumen and a needle electrode distal end;

a return electrode;

a removable introducer slidably positioned in the treatment needle lumen, the introducer including an introducer distal end;

a first sensor positioned on a surface of the needle electrode or the introducer;

an RF power source coupled to the treatment needle electrode; and

resources associated with the first thermal sensor, return electrode and the RF power source for maintaining a selected power at the electrode independent of changes in current or voltage.

2. The RF treatment device of claim 1, further comprising:

an infusion device including an infusion device lumen, the catheter being at least partially positioned in the infusion lumen and removable therefrom.

3. The RF treatment apparatus of claim 1, further comprising:

an insulator, with an insulator distal end, positioned in the catheter lumen in a surrounding relationship to the needle electrode, the insulator being slidably positioned along a longitudinal axis of the treatment needle electrode to define a needle electrode conductive surface beginning at the insulator distal end;

4. The RF treatment apparatus of claim 1, wherein the first sensor is positioned at the introducer distal end.

5. The RF treatment apparatus of claim 3, further comprising:

a second sensor associated with the resources and positioned on a surface of the insulator.

6. The RF treatment apparatus of claim 1, wherein the needle electrode distal end is sharpened.

7. The RF treatment apparatus of claim 6, wherein the introducer distal end is sharpened.

8. The RF treatment apparatus of claim 7, wherein the introducer distal end is substantially flush with the needle electrode distal end when positioned at the treatment needle electrode distal end.

9. The RF treatment apparatus of claim 1, wherein the needle electrode includes a plurality of fluid distribution ports.

10. The RF treatment apparatus of claim 1, wherein the needle electrode is operated in a bipolar mode.

11. An RF treatment apparatus, comprising:

a catheter including a catheter lumen;

an insert removably positioned in the catheter lumen in a fixed relationship to the catheter, the insert including an insert lumen and an insert distal end;

an removable electrode positioned in the insert, the electrode having an electrode distal end that advances out of the insert distal end and introduces RF treatment energy along a conductive surface of the electrode;

a return electrode;

a first sensor positioned on an electrode or insert surface;

an RF power source coupled to the electrode; and

resources associated with the thermal sensor, return electrode and the RF power source for maintaining a selected power at the electrode independent of changes in voltage or current.

12. The RF treatment apparatus of claim 11, further comprising:

a removable introducer slidably positioned in the insert lumen, the introducer having an introducer distal end that reduces an entry of material into the insert distal end as the insert is advanced through a body structure.

13. The RF treatment apparatus of claim 11, further comprising:

an insulator, with an insulator distal end, positioned in a surrounding relationship to the electrode, the insulator being slidable along a longitudinal axis of the needle electrode to define an electrode conductive surface beginning at the insulator distal end.

14. The RF treatment apparatus of claim 11, wherein the electrode is advanced out of the insert distal end in a lateral direction relative to a longitudinal axis of the insert.

15. The RF treatment apparatus of claim 11, wherein the first sensor is positioned on an electrode surface.

16. The RF treatment apparatus of claim 11 further comprising:

a second sensor associated with the resources and positioned on an insulator surface.

17. The RF treatment apparatus of claim 11, further comprising:

a transponder positioned on an electrode surface.

18. The RF treatment apparatus of claim 17, wherein the transponder is positioned on the electrode distal end.

19. The RF treatment apparatus of claim 11, wherein the electrode is hollow and includes a plurality of fluid distribution ports.

20. The RF treatment apparatus of claim 11, further comprising:

an infusion device including an infusion device lumen, the catheter being at least partially positioned in the infusion device lumen and removable therefrom.

21. The RF treatment apparatus of claim 11, wherein the electrode distal end is sharpened.

22. The RF treatment apparatus of claim 11, wherein the electrode operates in a bipolar mode.

24. The RF treatment apparatus of claim 23, further comprising:

a removable introducer slidably positioned in the needle electrode lumen with an introducer distal end.

25. The RF treatment apparatus of claim 24, further comprising:

a second sensor associated with the resources and positioned on a surface of the introducer.

26. The RF treatment apparatus of claim 23, wherein the catheter is removable from the infusion device, while the infusion device remains positioned in a body structure.

27. The RF treatment apparatus of claim 24, wherein the catheter, treatment needle electrode, insulator and removable introducer are all removable from the infusion device lumen, while the infusion device remains positioned in a body structure.

28. The RF treatment apparatus of claim 24, wherein the needle electrode distal end is sharpened.

29. The RF treatment apparatus of claim 28, wherein the introducer distal end is sharpened.

30. The RF treatment apparatus of claim 29, wherein the introducer distal end is flush with the treatment needle electrode distal end when positioned at the treatment needle electrode distal end.

31. The RF treatment apparatus of claim 23, wherein the needle electrode includes a plurality of fluid distribution ports.

32. The RF treatment apparatus of claim 23, wherein the needle electrode operates in a bipolar mode.

23. An RF treatment apparatus, comprising:

an infusion device including an infusion device lumen;

a catheter including a catheter lumen, the catheter being at least partially positioned in the infusion device lumen and removable therefrom;

a removable needle electrode positioned in the catheter lumen in a fixed relationship to the catheter, the needle electrode including a needle lumen;

a return electrode;

an insulator, with an insulator distal end, in a surrounding relationship to the needle electrode, the insulator being slidably positioned along a longitudinal axis of the needle electrode to define a needle electrode conductive surface beginning at the insulator distal end;

a first sensor positioned on an electrode or insulator surface;

an RF power source coupled to the treatment needle electrode; and

resources associated with the first thermal sensor, return electrode and the RF power source for maintaining a selected power at the electrode independent of changes in voltage or current.