EP0908156A1
Expired / Lapsed
EP
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Multiple electrode ablation apparatus
Assignee: Rita Medical Systems LLC
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Filing: 1995-08-11
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Granted: —
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Expires: 2015-08-11
Abstract
Abstract A tissue ablation apparatus includes a delivery catheter with distal and proximal ends. A handle is attached to the proximal end of the delivery catheter. At least partially positioned in the delivery catheter is an electrode deployment device. The electrode deployment device includes a plurality of retractable electrodes. Each electrode has a non-deployed state when it is positioned in the delivery catheter. Additionally, each electrode has a distended deployed state when it is advanced out of the delivery catheter distal end. The deployed electrodes define an ablation volume. Each deployed electrode has a first section with a first radius of curvature. The first section is located near the distal end of the delivery catheter. A second section of the deployed electrode extends beyond the first section, and has a second radius of curvature, or a substantially linear geometry.
Inventors
- 👤 Stuart D. Edwards
- 👤 Ronald G. Lax
- 👤 Hugh Sharkey
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 08:00
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/14; A61B18/1477; A61B18/1482; A61B18/18; A61B18/1815; A61N; A61N1/00; A61N1/40; A61N1/403; C; C22; C22C; C22C14/00; C22F; C22F1/00; C22F1/16; C22F1/18; C22F1/183; A61B18/1206; A61B18/1402; A61B18/1485; A61B18/1492; A61B17/00; A61B2017/00017; A61B2017/00022; A61B2017/00026; A61B2017/00084; A61B2017/00101; A61B2018/00005; A61B2018/00011; A61B2018/00023; A61B2018/00053; A61B2018/00184; A61B2018/00196; A61B2018/00273; A61B2018/00315; A61B2018/00452; A61B2018/00476; A61B2018/00571; A61B2018/00577; A61B2018/00636; A61B2018/00642; A61B2018/00666; A61B2018/00678; A61B2018/00696; A61B2018/00702; A61B2018/00708; A61B2018/00726; A61B2018/00744; A61B2018/00761; A61B2018/00773; A61B2018/00779; A61B2018/00791; A61B2018/00797; A61B2018/00821; A61B2018/00827; A61B2018/00875; A61B2018/00892; A61B2018/124; A61B2018/1246; A61B2018/1253; A61B2018/126; A61B2018/1405; A61B2018/1425; A61B2018/143; A61B2018/1432; A61B2018/1435; A61B2018/1472; A61B18/16; A61B2018/162; A61B2018/1861; A61B2218/00; A61B2218/001; A61B2218/002; A61M; A61M25/00; A61M25/0067; A61M25/0068; A61M25/007; B; B22; B22F; B22F2999/00
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
119 words
An ablation apparatus, comprising: an introducer having a proximal end, means for holding the introducer, a lumen
and a distal end sufficiently sharp to penetrate tissue; an energy delivery device including a first RF electrode with a tissue piercing
distal portion and a second RF electrode with a tissue piercing distal portion, the first
and second RF electrodes being positionable in the introducer as the introducer is
advanced through tissue and deployable with curvature from the introducer at a
selected tissue site in a lateral direction away from the periphery of the introducer; and an RF electrode advancement member coupled to the first and second RF
electrodes and configured to advance the first and second RF electrodes through tissue.
Claim 2
Dependent Claim
15 words
The apparatus of Claim 1, wherein the introducer is configured to receive a
fluidic medium.
Claim 3
Dependent Claim
20 words
The apparatus of Claim 2, wherein the first RF electrode includes a hollow
lumen configured to receive a fluidic medium.
Claim 4
Dependent Claim
20 words
The apparatus of Claim 3, wherein the second RF electrode includes a hollow
lumen configured to receive a fluidic medium.
Claim 5
Independent Claim
25 words
The apparatus of any preceding claim, further comprising: an insulator positioned in a surrounding relation to at least a portion of the first
RF electrode.
Claim 6
Independent Claim
25 words
The apparatus of any preceding claim, further comprising: an insulator positioned in a surrounding relation to at least a portion of the
second RF electrode.
Claim 7
Independent Claim
10 words
The apparatus of any preceding claim, further comprising: an obturator.
Claim 8
Dependent Claim
13 words
The apparatus of Claim 7, wherein the obturator has a piercing distal end.
Claim 9
Dependent Claim
17 words
The apparatus of Claim 7 or Claim 8, wherein the obturator is positionable in
the elongated member.
Claim 10
Independent Claim
18 words
The apparatus of any preceding claim, wherein the first RF electrode is formed
of a shaped memory alloy.
Claim 11
Independent Claim
20 words
The apparatus of any one of Claims 1 to 9, wherein the first RF electrode is
formed of stainless steel.
Claim 12
Independent Claim
21 words
The apparatus of any preceding claim, wherein the first and second RF
electrodes are deployable to surround a selected tissue site.
Claim 13
Dependent Claim
18 words
The apparatus of Claim 12, wherein the first and second RF electrodes are
deployable to surround a tumor.
Claim 14
Dependent Claim
30 words
The apparatus of Claim 13, wherein the introducer is introducable through the
selected tissue site and the first and second RF electrodes are deployable to surround
the selected tissue site.
Claim 15
Independent Claim
16 words
The apparatus of any preceding claim, further comprising: a sensor coupled to the first RF electrode.
Claim 16
Dependent Claim
12 words
The apparatus of Claim 15, wherein the sensor is a thermal sensor.
Claim 17
Independent Claim
14 words
The apparatus of any preceding claim, further comprising: a sensor coupled to the introducer.
Claim 18
Independent Claim
25 words
The apparatus of any one of Claims 15 to 17, further comprising: a feedback control coupled to the sensor and to the first RF electrode.
Claim 19
Independent Claim
12 words
The apparatus of any preceding claim, further comprising: an impedance measurement apparatus.
Claim 20
Dependent Claim
64 words
The apparatus of Claim 19, wherein the impedance measurement apparatus
comprises: a controller; a microprocessor coupled to the controller; and a feedback control including circuitry, wherein RF energy is delivered to a
tissue site, a measurement of a voltage and current of a tissue site are determined and
the current adjusted according to the measurement of the voltage and current of the
tissue site.
Claim 21
Independent Claim
94 words
The apparatus of any preceding claim, wherein the energy delivery device
further includes a third RF electrode with a tissue piercing distal portion, the first
second and third RF electrodes being positionable in the introducer as the introducer is
advanced through tissue and deployable three dimensionally with curvature from the
introducer at a selected tissue site in a lateral direction away from the periphery of the
introducer, the RF electrode advancement member being coupled to the first, second
and third RF electrodes and configured to advance the first and second RF electrodes
through tissue.
Claim 22
Dependent Claim
21 words
The apparatus of Claim 21, wherein the first, second and third RF electrodes
are deployable to surround a selected tissue site.
Claim 23
Dependent Claim
19 words
The apparatus of Claim 22, wherein the first, second and third RF electrodes
are deployable to surround a tumor.
Claim 24
Dependent Claim
31 words
The apparatus of Claim 21, wherein the introducer is introduced through the
selected tissue site and the first, second and third RF electrodes are deployable to
surround the selected tissue site.
Claim 25
Independent Claim
16 words
The apparatus of any preceding claim wherein each RF electrode has a tissue
piercing distal end.
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