RF treatment apparatus

• US 5,599,345 A
• Filed: 08/24/1994
• Issued: 02/04/1997
• Est. Priority Date: 11/08/1993
• Status: Expired due to Term

• Current Assignee: AngioDynamics, Inc.
• Original Assignee: ZoMed International, Inc.
• Inventors: Baker, James, Edwards, Stuart D., Lax, Ronald G., Strul, Bruno
• Primary Examiner(s): Sykes, Angela D.
• Assistant Examiner(s): PEFFLEY, MICHAEL F
• Application Number:
  US08/295,166
• Time in Patent Office: 895 Days
• Field of Search: 606/32-34, 606/37-42, 606/45-50, 604/22, 607/100-102, 607/115, 607/116
• 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 treatment 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 one of a surface of the treatment electrode or the introducer;

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

resources connected with the first sensor, return electrode and the RF power source for maintaining a selected power at the treatment 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 connected 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 return electrode is a treatment electrode and both treatment electrodes are operated in a bipolar mode.

11. An RF treatment apparatus, comprising:

an infusion device including a 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 treatment 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 treatment electrode, the insulator being slidably positioned along a longitudinal axis of the treatment electrode to define a treatment electrode conductive surface beginning at the insulator distal end;

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

a first sensor positioned on one of a treatment electrode or insulator surface;

an RF power source coupled to the treatment electrode; and

resources connected with the first sensor, return electrode and the RF power source for maintaining a selected power at the treatment electrode, the resources measuring both voltage and current.

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

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

13. The RF treatment apparatus of claim 11, wherein the catheter is removable from the infusion device, while the infusion device remains positioned in a body structure.

14. The RF treatment apparatus of claim 11, 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.

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

16. The RF treatment apparatus of claim 15, wherein the introducer distal end is sharpened.

17. The RF treatment apparatus of claim 16, wherein the introducer distal end is flush with the treatment needle electrode distal end when positioned at the treatment needle electrode distal end.

18. The RF treatment apparatus of claim 11, wherein the needle electrode includes a plurality of fluid distribution ports.