Method of treatment with adjustable ferromagnetic coated conductor thermal surgical tool

• US 8,292,879 B2
• Filed: 12/24/2009
• Issued: 10/23/2012
• Est. Priority Date: 04/17/2009
• Status: Active Grant

• Current Assignee: Domain Surgical, Inc (OmniGuide Holdings, Inc.)
• Original Assignee: Domain Surgical, Inc (OmniGuide Holdings, Inc.)
• Inventors: Manwaring, Kim, McNally, David
• Primary Examiner(s): Dvorak, Linda
• Assistant Examiner(s): DELLA, JAYMI E
• Application Number:
  US12/647,363
• Publication Number:
  US 20100268205A1
• Time in Patent Office: 1,034 Days
• Field of Search: 606/47, 606/113, 606/27, 606/31, 607/103, 607/96
• US Class Current: 606/31
• CPC Class Codes: A61B 17/00234 for minimally invasive surgery A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence
• CPC Class Codes: A61B 17/320068 using mechanical vibrations, e.g. ultrasonic A61B17/22012 takes precedence; dental tooth drilling devices operated by vibration A61C3/03; removing intra-ocular material using mechanical vibrations A61F9/00745
• CPC Class Codes: A61B 17/3211 Surgical scalpels, knives; Accessories therefor
• 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 18/08 by means of electrically-heated probes
• CPC Class Codes: A61B 18/082 Probes or electrodes therefor
• CPC Class Codes: A61B 18/085 Forceps, scissors
• CPC Class Codes: A61B 18/10 Power sources therefor
• CPC Class Codes: A61B 18/1206 Generators therefor
• 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 2017/00141 continuous, e.g. wave
• CPC Class Codes: A61B 2017/00876 magnetic
• CPC Class Codes: A61B 2017/00973 pedal-operated
• CPC Class Codes: A61B 2017/320069 for ablating tissue
• CPC Class Codes: A61B 2017/32007 with suction or vacuum means
• CPC Class Codes: A61B 2017/320082 for incising tissue
• CPC Class Codes: A61B 2018/00077 high, i.e. electrically conducting
• CPC Class Codes: A61B 2018/00095 high, i.e. heat conducting
• CPC Class Codes: A61B 2018/00107 Coatings on the energy applicator
• CPC Class Codes: A61B 2018/0013 non-sticking
• CPC Class Codes: A61B 2018/00577 : Ablation
• CPC Class Codes: A61B 2018/00589 : Coagulation
• CPC Class Codes: A61B 2018/00595 : Cauterization
• CPC Class Codes: A61B 2018/00601 : Cutting
• CPC Class Codes: A61B 2018/00619 : Welding
• CPC Class Codes: A61B 2018/00642 : with feedback, i.e. closed loop control
• CPC Class Codes: A61B 2018/00654 : with individual control of each of a plurality of energy emitting elements
• CPC Class Codes: A61B 2018/00702 : Power or energy
• CPC Class Codes: A61B 2018/00714 : Temperature
• CPC Class Codes: A61B 2018/00755 : Resistance or impedance
• CPC Class Codes: A61B 2018/00791 : Temperature
• CPC Class Codes: A61B 2018/00803 : with temperature prediction
• CPC Class Codes: A61B 2018/00958 : for switching between different working modes of the main function
• CPC Class Codes: A61B 2018/128 : generating two or more frequencies
• CPC Class Codes: A61B 2018/1407 : Loop
• CPC Class Codes: A61B 2018/1412 : Blade
• CPC Class Codes: A61M 25/00 : Catheters; Hollow probes dilators A61M29/00; peritoneal catheters A61M1/285; tracheal tubes A61M16/04; for drainage A61M27/00; for uterus, vagina or rectum A61M31/00 ; for measuring or testing A61B; materials for catheters A61L29/00
• CPC Class Codes: A61M 25/0082 : Catheter tip comprising a tool
• CPC Class Codes: Y10T 29/49124 : On flat or curved insulated base, e.g., printed circuit, etc.

Abstract

An electrical conductor, such as a wire or catheter, which is coated circumferentially with a ferromagnetic material in a selected region, is fed from a high frequency alternating current source. The ferromagnetic material has a quick response in heating and cooling to the controllable power delivery. The ferromagnetic material can be used for separating tissue, coagulation, tissue destruction or achieving other desired tissue effects in numerous surgical procedures.

Claims

1. A method for treating tissue, the method comprising:

selecting a conductor having a ferromagnetic coating disposed on a portion thereof, the conductor extending through the entire ferromagnetic coating;

disposing the ferromagnetic coating into contact with the tissue; and

delivering an oscillating electrical signal to the conductor so as to heat the ferromagnetic coating; and

treating the tissue; and

wherein delivering an oscillating electrical signal to the conductor comprises variably controlling power of the oscillating electrical signal to heat the ferromagnetic coating to achieve a temperature above about 40 degrees Centigrade and below a Curie temperature of the ferromagnetic coating.

2. The method according to claim 1, wherein the ferromagnetic coating is plated on the conductor.

3. The method according to claim 1, wherein the selected conductor is about 0.375 millimeters in diameter and wherein the ferromagnetic coating has a thickness of about 0.05 millimeters or smaller.

4. The method according to claim 1, wherein the conductor has a low thermal mass to provide for rapid temperature regulation.

5. The method according to claim 1, wherein the selecting step comprises selecting the conductor to have a first portion, a second portion and a middle portion disposed between the first portion and the second portion, the middle portion being formed in a shape selected from the group of loop, solid loop, square, pointed, hook and angled, and wherein the ferromagnetic coating is disposed only on part of the middle portion.

7. The method according to claim 1, wherein treating the tissue includes incising the tissue by contacting the tissue with the heated ferromagnetic coating.

8. The method according to claim 1, wherein treating the tissue includes causing hemostasis in the tissue by contacting the tissue with the heated ferromagnetic coating.

9. The method according to claim 1, wherein treating the tissue includes ablating the tissue by contacting the tissue with the heated ferromagnetic coating.

10. The method according to claim 1, wherein treating the tissue includes vascular endothelial welding by contacting the tissue with the heated ferromagnetic coating.

6. A method for treating tissue, the method comprising:

selecting a conductor having a ferromagnetic coating disposed on a portion thereof, the conductor extending through the entire ferromagnetic coating;

disposing the ferromagnetic coating into contact with the tissue; and

delivering an oscillating electrical signal to the conductor so as to heat the ferromagnetic coating; and

treating the tissue; and

wherein delivering an oscillating electrical signal to the conductor comprises variably controlling power of the oscillating electrical signal to heat and maintain the ferromagnetic coating at a temperature between about 37 and 600 degrees Centigrade.

11. A method for treating tissue, the method comprising:

selecting a conductor having a ferromagnetic coating disposed on a portion thereof, the conductor extending through the entire ferromagnetic coating;

disposing the ferromagnetic coating into contact with the tissue; and

delivering an oscillating electrical signal to the conductor so as to heat the ferromagnetic coating; and

treating the tissue; and

wherein delivering an oscillating electrical signal to the conductor comprises variably controlling power of the oscillating electrical signal to heat and maintain the ferromagnetic coating at a temperature between about 80-200 degrees Centigrade to promote tissue searing and sealing.

12. A method for treating tissue, the method comprising:

selecting a conductor having a ferromagnetic coating disposed on a portion thereof, the conductor extending through the entire ferromagnetic coating;

disposing the ferromagnetic coating into contact with the tissue; and

delivering an oscillating electrical signal to the conductor so as to heat the ferromagnetic coating; and

treating the tissue; and

wherein delivering an oscillating electrical signal to the conductor comprises variably controlling power of the oscillating electrical signal to heat and maintain the ferromagnetic coating at a temperature between about 200-400 degrees Centigrade to create tissue incisions.

13. A method for treating tissue, the method comprising:

selecting a conductor having a ferromagnetic coating disposed on a portion thereof, the conductor extending through the entire ferromagnetic coating;

disposing the ferromagnetic coating into contact with the tissue; and

delivering an oscillating electrical signal to the conductor so as to heat the ferromagnetic coating; and

treating the tissue; and

wherein delivering an oscillating electrical signal to the conductor comprises variably controlling power of the oscillating electrical signal to heat and maintain the ferromagnetic coating at a temperature between about 400-500 degrees Centigrade to cause tissue ablation and vaporization.