WO1997038637B1 - A moisture transport system for contact electrocoagulation - Google Patents

A moisture transport system for contact electrocoagulation

Info

Publication number
WO1997038637B1
WO1997038637B1 PCT/US1997/005927 US9705927W WO9738637B1 WO 1997038637 B1 WO1997038637 B1 WO 1997038637B1 US 9705927 W US9705927 W US 9705927W WO 9738637 B1 WO9738637 B1 WO 9738637B1
Authority
WO
WIPO (PCT)
Prior art keywords
carrying member
electrodes
electrode carrying
tissue
ablation
Prior art date
Application number
PCT/US1997/005927
Other languages
French (fr)
Other versions
WO1997038637A1 (en
Filing date
Publication date
Priority claimed from US08/632,516 external-priority patent/US5769880A/en
Priority to CA002251216A priority Critical patent/CA2251216A1/en
Priority to BR9708644-4A priority patent/BR9708644A/en
Priority to AT97917166T priority patent/ATE297696T1/en
Priority to IL12647197A priority patent/IL126471A0/en
Priority to EP97917166A priority patent/EP0898465B1/en
Application filed filed Critical
Priority to JP53720297A priority patent/JP3942639B2/en
Priority to DE69733556T priority patent/DE69733556T2/en
Priority to AU25585/97A priority patent/AU721648B2/en
Publication of WO1997038637A1 publication Critical patent/WO1997038637A1/en
Publication of WO1997038637B1 publication Critical patent/WO1997038637B1/en
Priority to NO984741A priority patent/NO984741L/en

Links

Abstract

An apparatus and method for use in performing ablation of organs and other tissue includes an electrode carrying member which is substantially absorbent and/or permeable to moisture. The electrode carrying member is mounted to the distal end of an elongate shaft, and an array of electrodes is mounted to the surface of the electrode carrying member. Following placement of the ablation device into contact with the tissue to be ablated, an RF generator is used to deliver RF energy to the electrodes and to thereby induce current flow from the electrodes to tissue to be ablated. As the current heats the tissue, moisture (such as water vapor or liquid) leaves the tissue causing the tissue to dehydrate. The moisture permeability and/or absorbency of the electrode carrying member allows the moisture to leave the ablation site so as to prevent the moisture from providing a path of conductivity for the current.

Claims

AMENDED CLAIMS freceived by the International Bureau on 11 October 1997 (11.10.97); original claims 9-12, 17 and 21 amended; new claims 27 and 28 added; remaining claims unchanged (6 pages)]
1. A method of ablating and/or coagulating tissue, comprising the steps of:
(a) providing an electrode carrying member with electrodes thereon;
(b) positioning the electrodes in contact with tissue to be ablated;
(c) passing current through the electrodes to the tissue to cause the tissue to dehydrate; and
(d) permitting moisture generated during the dehydration of step (c) to pass into the electrode carrying member and away from the tissue.
2. The method of claim 1 wherein the tissue has a surface and wherein step (b) includes the step of causing the electrode carrying member to conform to the shape of the tissue surface.
3. The method of claim 1 wherein step (a) includes providing an elongate tube and wherein the step of providing the electrode carrying member includes providing the electrode carrying member on a distal portion of the tube, and wherein step (d) includes the step of permitting at least a portion of the moisture to pass from the electrode carrying member through the tube .
4. The method of claim 3 wherein step (d) includes the step of applying suction to the tube to draw the moisture through the tube.
5. The method of claim 1 wherein the method further includes the step of (e) automatically terminating the flow of current into the tissue once ablation has approximately reached a predetermined depth or level of dehydration.
6. The method of claim 1 wherein the method further includes the steps of:
(e) monitoring the impedance of the tissue undergoing ablation; and
(f) terminating the ablation procedure once the impedance has reached a predetermined level.
7. The method of claim 1 wherein step (c) includes the step of passing current through select ones of the electrodes.
8. The method of claim 1 including the step of applying suction through the electrode carrying means to draw the tissue into contact with the electrode carrying means and the electrodes to facilitate moisture removal.
9. An ablation and/or coagulation apparatus for use in delivering energy to tissue for ablation, the apparatus comprising: a moisture permeable and/or absorbable electrode carrying member; electrodes mounted to the electrode carrying member; means for delivering radio frequency energy to the electrodes; and means capable of drawing moisture into and through the electrode carrying member.
10. An ablation and/or coagulation apparatus for use in delivering energy to tissue for ablation, the apparatus comprising: a moisture permeable and/or absorbable electrode carrying member; electrodes mounted to the electrode carrying member; means for delivering radio frequency energy to the electrodes; and an elongate tube, wherein the electrode carrying member is mounted to the tube, and wherein the tube includes a plurality of aeration openings underlying the electrode carrying member.
11. The apparatus of claim 9 wherein the means capable of drawings moisture includes suction means for drawing moisture away from the electrode carrying member.
12. The apparatus of claim 9 wherein the apparatus further comprises an elongate tube, wherein the electrode carrying member is mounted to the tube, and wherein the means capable of drawings moisture includes suction means for drawing moisture through the tube away from the electrode carrying member.
13. The apparatus of claim 9 wherein the electrode carrying member is formed of sponge.
14. The apparatus of claim 9 wherein the electrode carrying member is formed of foam.
15. The apparatus of claim 9 wherein the electrode carrying member is formed of a porous filler material. 1
16. The apparatus of claim 9 wherein the electrode carrying member is further formed of conformable material .
17. The ablation apparatus of claim 9 further comprising structural support means within the electrode carrying member.
18. The ablation apparatus of claim 17 wherein the structural support means includes an inflatable balloon.
19. The ablation apparatus of claim 17 wherein the structural support means comprises spring members positioned within the electrode carrying member.
20. The ablation apparatus of claim 19 wherein the spring members are moveable between a closed condition and an opened condition.
21. The ablation apparatus of claim 9 further comprising at least one contact sensor carried by the electrode carrying member and means for measuring impedance.
22. An apparatus for intrauterine ablation, comprising: an elongate tube; an electrode carrying pad mounted to the tube and shaped to approximate the shape of a uterus; an array of electrodes mounted to the pad; means for delivering RF energy to the electrodes to cause current flow from the electrodes to tissue to be ablated; and means for automatically terminating the flow of current from the electrodes to the tissue once a predetermined ablation depth has been substantially reached.
23. The apparatus of claim 22 further comprising means for drawing moisture from tissue undergoing ablation into the electrode carrying pad.
24. A method of ablating tissue, comprising the steps of :
(a) providing an electrode carrying member with electrodes thereon;
(b) positioning the electrodes in contact with tissue to be ablated;
(c) selecting a depth to which ablation is to be carried out; and
(d) delivering RF energy to the tissue through select ones of the electrodes to cause ablation of the tissue to approximately the selected ablation depth.
25. The method of claim 24 wherein step (d) includes the step of selecting an effective electrode spacing which would produce ablation to approximately the desired ablation depth, and delivering RF energy to select ones of the electrodes such that the spacing between the energized electrodes is substantially the selected effective electrode spacing.
26. The method of claim 24 wherein step (d) includes the step of selecting an electrode surface density which will produce ablation to approximately the desired ablation depth, and delivering RF energy to select ones of the electrodes such that the electrode surface density of the energized electrodes is substantially the selected electrode surface density.
27. The apparatus of claim 9 wherein the electrode carrying member and electrodes are formed of a metallized fabric.
28. The apparatus of claim 27 wherein the metallized fabric includes insulating layers etched thereon to separate the electrodes.
PCT/US1997/005927 1996-04-12 1997-04-10 A moisture transport system for contact electrocoagulation WO1997038637A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
AU25585/97A AU721648B2 (en) 1996-04-12 1997-04-10 A moisture transport system for contact electrocoagulation
BR9708644-4A BR9708644A (en) 1996-04-12 1997-04-10 Moisture transport system for contact electrocoagulation
AT97917166T ATE297696T1 (en) 1996-04-12 1997-04-10 MOISTURE PROMOTION SYSTEM FOR TOUCH ELECTROCOAGULATION
IL12647197A IL126471A0 (en) 1996-04-12 1997-04-10 A moisture transport system for contact electrocoagulation
EP97917166A EP0898465B1 (en) 1996-04-12 1997-04-10 A moisture transport system for contact electrocoagulation
CA002251216A CA2251216A1 (en) 1996-04-12 1997-04-10 A moisture transport system for contact electrocoagulation
JP53720297A JP3942639B2 (en) 1996-04-12 1997-04-10 Moisture transport system for contact electrocoagulation
DE69733556T DE69733556T2 (en) 1996-04-12 1997-04-10 MOISTURE SUPPLY SYSTEM FOR TOUCH ELECTROCOPAGLATION
NO984741A NO984741L (en) 1996-04-12 1998-10-09 Humidity transport system for contact electrocoagulation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/632,516 1996-04-12
US08/632,516 US5769880A (en) 1996-04-12 1996-04-12 Moisture transport system for contact electrocoagulation

Publications (2)

Publication Number Publication Date
WO1997038637A1 WO1997038637A1 (en) 1997-10-23
WO1997038637B1 true WO1997038637B1 (en) 1997-11-20

Family

ID=24535818

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/005927 WO1997038637A1 (en) 1996-04-12 1997-04-10 A moisture transport system for contact electrocoagulation

Country Status (13)

Country Link
US (1) US5769880A (en)
EP (2) EP0898465B1 (en)
JP (1) JP3942639B2 (en)
KR (1) KR20000005488A (en)
CN (1) CN1220590A (en)
AT (2) ATE297696T1 (en)
AU (1) AU721648B2 (en)
BR (1) BR9708644A (en)
CA (1) CA2251216A1 (en)
DE (2) DE69739697D1 (en)
IL (1) IL126471A0 (en)
NO (1) NO984741L (en)
WO (1) WO1997038637A1 (en)

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