Endoscopic surgical instrument

• US 6,730,081 B1
• Filed: 11/24/1997
• Issued: 05/04/2004
• Est. Priority Date: 10/18/1991
• Status: Expired due to Fees

• Current Assignee: Ashvin H. Desai
• Original Assignee: Ashvin H. Desai
• Inventors: Desai, Ashvin H.
• Primary Examiner(s): Brown, Michael A.
• Application Number:
  US08/976,981
• Time in Patent Office: 2,353 Days
• Field of Search: 640/6, 640/7, 640/8, 606/40
• US Class Current: 606/40
• 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 17/3498 Valves therefor, e.g. flapper valves, slide valves haemostasis valves A61M39/06; check valves A61M39/24
• CPC Class Codes: A61B 18/14 Probes or electrodes therefor
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 18/1442 Probes having pivoting end effectors, e.g. forceps
• 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 18/149 bow shaped or with rotatable body at cantilever end, e.g. for resectoscopes, or coagulating rollers
• CPC Class Codes: A61B 2017/00026 Conductivity or impedance, e.g. of tissue
• CPC Class Codes: A61B 2017/00464 for use with different instruments with hole for different instruments A61B2017/22072
• CPC Class Codes: A61B 2017/22072 with an instrument channel, e.g. for replacing one instrument by the other in cannulas A61B17/3417
• CPC Class Codes: A61B 2018/00517 Urinary bladder or urethra
• CPC Class Codes: A61B 2018/00607 Coagulation and cutting with the same instrument
• CPC Class Codes: A61B 2018/00755 Resistance or impedance
• CPC Class Codes: A61B 2018/00875 Resistance or impedance
• CPC Class Codes: A61B 2018/0091 Handpieces of the surgical instrument or device
• CPC Class Codes: A61B 2018/00916 with means for switching or controlling the main function of the instrument or device
• CPC Class Codes: A61B 2018/00982 combined with or comprising means for visual or photographic inspections inside the body, e.g. endoscopes
• 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 2218/002 : Irrigation
• CPC Class Codes: A61B 2218/007 : Aspiration
• CPC Class Codes: A61M 1/772 : operating alternately
• CPC Class Codes: A61M 1/774 : Handpieces specially adapted for providing suction as well as irrigation, either simultaneously or independently
• CPC Class Codes: A61N 5/0601 : Apparatus for use inside the body
• CPC Class Codes: A61N 5/062 : Photodynamic therapy, i.e. excitation of an agent

Abstract

An improved electrode for use with an endoscope, used for simultaneously vaporizing, coagulating and cutting of tissue. The construction of the electrodes is such that the connecting end joins an elongated stem having a conductive center conductor, a majority of which is enclosed by a cover constructed from nonconductive material for the purpose of insulating the conductor from the endoscope conduit, telescope and resectoscope sheath. The cover may have an insulated saddle shaped extension for use in guiding a telescope. The conductor divides into two insulated conductive branches, and then exits the insulative cover forming a loop at a distal end of the electrode. The distal end portion of the conductive loop may angle away from the axial direction of the electrode, and the loop is completed with a straight conductive portion upon which an electrode tip is rotatably mounted. Outward conductive tip surfaces have RF energy director points for increasing power density of RF energy coupled thereto from the conductor. The high power density vaporizes surface tissue, and simultaneously coagulates the underlying tissue as well.

Claims

1. An RF electrode device comprising:

(a) electrode tip module means including first tip means for conducting RF energy to body tissue;

(b) electrode stem means including

i) first conductor means for electrically connecting said first tip means at a distal end of said first conductor means to a first connective means at a proximal end of said first conductor means for connection to a first side of a source of RF energy;

ii) insulative means for electrically insulating a portion of said first conductor means;

iii) telescope guide means for guiding an endoscopic telescope, said guide means constructed of electrically insulative material.

2. An RF electrode device as recited in claim 1 wherein said telescope guide means has a saddle shape.

3. An RF electrode device as recited in claim 1 wherein said first tip means is a wire loop.

4. An RF electrode device as recited in claim 1 wherein

(a) said electrode tip module means includes a second tip means for receiving energy from said body tissue; and

(b) said electrode stem means further includes

(i) second conductor means for electrically connecting said second tip means at a distal end of said second conductor to a second conductive means at a proximal end of said first conductor means for connecting to a second side of said source of RF energy; and

(ii) insulative means for electrically insulating a portion of said second conductor means.

5. An RF electrode device as recited in claim 4 wherein said electrode stem means further includes

(i) second conductor means for electrically connecting said second tip means at a distal end of said second conductor means to a second connective means at said proximal end of said second conductor means for connection to a second side at a source of RF energy;

and

(ii) wherein said insulative means further insulates a portion of said second conductor means.

6. An RF electrode device as recited in claim 1 wherein said first tip means is a needle.

7. An RF electrode device as recited in claim 1 wherein said first tip means is a roller.

8. An RF electrode device as recited in claim 7 wherein said roller has extremities of smaller area providing RF field enhancement.

9. An RF electrode device as recited in claim 7 further comprising connecting means for removably connecting said electrode tip module means from said electrode stem means.

10. A method of operating an endoscopic surgical instrument for tissue treatment by application of RF energy comprising:

(a) depositing an electrically conductive fluid on a body tissue;

(b) applying an active side of an RF energy source to an electrode tip for contact with said tissue and said fluid at a first position; and

(c) receiving RF energy passed through said tissue and said fluid to a second position for return to a passive side of said RF energy source.

11. A method as recited in claim 10 wherein said conductive fluid is a saline solution.

12. A method as recited in claim 10 wherein said receiving includes conduction of said RF energy through a portion of a housing of said endoscopic surgical instrument.

13. A method as recited in claim 10 wherein said applying is performed by conduction of said RF energy to said tissue and fluid through a first RF electrode tip, and said receiving includes conduction of said RF energy through a second RF electrode tip.

14. A method as recited in claim 10 wherein said receiving includes conduction of said RF energy through a conductive pad on an exterior portion of a patient'"'"'s body.

15. An endoscopic surgical instrument comprising:

(a) an endoscope housing having an elongated housing means for insertion into a body cavity, said housing means having a conduit formed therethrough;

(b) an RF electrode device for installation through said conduit including

(i) electrode tip module means including first tip means for conducting RF energy to body tissue;

(ii) electrode stem means including

a) first conductor means for electrically connecting said first tip means at a distal end of said first conductor means to a first connective means at a proximal end of said first conductor means for connection to a first side of a source of RF energy; and

b) insulative means for electrically insulating a portion of said first conductor means.

16. An endoscopic surgical instrument as recited in claim 15 further comprising:

(a) conductive element means having second connection means for electrically connecting said conductive element means to a second side of said source of RF energy;

whereby said endoscopic surgical instrument is operable upon connection to said RF energy source to cause RF energy to pass between said first tip means and said conductive element means.

17. An endoscope surgical instrument as recited in claim 16 wherein said conductive element is a conductive pad means for attachment to an exterior body portion of a patient to be treated;

whereby said endoscopic surgical instrument is operable in a monopolar mode wherein RF energy from said RF energy source can pass between said tip means and said conductive pad means.

18. An endoscopic surgical instrument as recited in claim 17 further comprising fluid supply means for directing a fluid through said conduit and out said distal end of said conduit.

19. An endoscopic surgical instrument as recited in claim 18 wherein said fluid is non-isotonic.

20. An endoscopic surgical instrument as recited in claim 18 wherein said fluid is isotonic for enhancing electrical current between said first tip means and said conductive element.

21. An endoscopic surgical instrument as recited in claim 16 wherein said conductive element is a conductive means included as part of said elongated housing means;

whereby said endoscopic surgical instrument is operable upon connection to said RF energy source to cause RF energy to pass between said first tip means and said conductive means and thereby operate in a bipolar mode.

22. An endoscopic surgical instrument as recited in claim 21 further comprising fluid supply means for directing a fluid through said conduit and out said distal end of said conduit.

23. An endoscopic surgical instrument as recited in claim 22 wherein said fluid is non-isotonic.

24. An endoscopic surgical instrument as recited in claim 22 wherein said fluid is isotonic for enhancing electrical current between said first tip means and said conductive element.

25. An endoscopic surgical instrument as recited in claim 16 wherein said conductive element is a second tip means for extension from a distal end of said conduit;

whereby said endoscopic surgical instrument is operable upon connection to said RF energy source to cause RF to pass between said first tip means to said second tip means and thereby operate in a bipolar mode to treat a localized are of tissue.

26. An endoscopic instrument as recited in claim 25 further comprising fluid supply means for directing a fluid through said conduit and out said distal end of said conduit.

27. An endoscopic instrument as recited in claim 26 wherein said fluid is non-isotonic.

28. An endoscopic instrument as recited in claim 26 wherein said fluid is isotonic for enhancing electrical current between said first tip means and said second tip means.