Patent US5246438A successfully refreshed from Google Patents.
US5246438A
Expired / Lapsed
US
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Method of radiofrequency ablation
Assignee: INNOVATIVE CARDIAC SOLUTIONS Inc
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Filing: 1992-01-09
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Granted: 1993-09-21
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Expires: 2012-01-09
Abstract
Abstract A cardiac ablation apparatus including a solenoidal antenna, monitoring electrodes, and a coupling network at a distal end of a catheter transmission line, and another coupling network at the proximal end of the catheter transmission line to connect the catheter to the source of radiofrequency (RF) power and to an intracardiac electrogram monitor. Solenoidal antenna design includes single and multiple windings with varying geometrical features. Plated plastic tri-axial design of a transmission line offers unitary fabrication. A catheter with variable impedance electrode and gap coatings has features useful for both ablation and for hyperthermia applications.
Inventors
- 👤 Edwin Langberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/14; A61B18/1492; A61B18/08; A61B18/18; A61B18/1815; A61N; A61N1/00; A61N1/02; A61N1/04; A61N1/06; A61N1/40; A61N1/403; A61B18/1206; A61B18/1233; A61B2018/00005; A61B2018/00053; A61B2018/00107; A61B2018/00315; A61B2018/00345; A61B2018/00351; A61B2018/00571; A61B2018/00577; A61B2018/00636; A61B2018/00773; A61B2018/00839; A61B2018/183; A61B2018/1846; A61M; A61M2230/00; A61M2230/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A method of thermally destroying myocardial tissue in a chamber of the heart to treat arrythmia comprising the steps of introducing into the heart chamber a catheter body that carries an antenna having an axis, conducting eletromagnetic power to the antenna while the catheter body is immersed in blood in the chamber, and conditioning the antenna to emit a helically generated electromagnetic field about the antenna axis that penetrates, heats, and thermally destroys myocardial tissue beyond the catheter body.
Claim 2
Independent Claim
79 words
A method of thermally destroying myocardial tissue in a chamber of the heart to treat arrythmia comprising the steps of introducing into the heart chamber a catheter body that carries an antenna having an axis, conducting eletromagnetic power to the antenna while the catheter body is immersed in blood in the chamber, and conditioning the antenna to emit a helically generated electromagnetic field about the antenna axis that penetrates, heats, and thermally destroys myocardial tissue beyond the catheter body.
Claim 3
Independent Claim
81 words
A method of thermally destroying myocardial tissue in a chamber of the heart to treat arrythmia comprising the steps of introducing into the heart chamber a catheter body that carries a solenoidal antenna having an axis, conducting electromagnetic power to the solenoidal antenna while the catheter body is immersed in blood in the heart chamber, and conditioning the solenoidal antenna to emit an electromagnetic field about the antenna axis to penetrate, heat, and thermally destroy myocardial tissue beyond the catheter body.
Claim 4
Independent Claim
81 words
A method of thermally destroying myocardial tissue in a chamber of the heart to treat arrythmia comprising the steps of introducing into the heart chamber a catheter body that carries a solenoidal antenna having an axis, conducting electromagnetic power to the solenoidal antenna while the catheter body is immersed in blood in the heart chamber, and conditioning the solenoidal antenna to emit an electromagnetic field about the antenna axis to penetrate, heat, and thermally destroy myocardial tissue beyond the catheter body.
Claim 5
Dependent Claim
18 words
A method according to claim 1 or 2 and further including the step of monitoring an endocardial signal.
Claim 6
Dependent Claim
33 words
A method according to claim 1 or 2 wherein in the step of emitting the electromagnetic field, the antenna is conditioned to emit the electromagnetic field symmetrically about the axis of the antenna.
Claim 7
Dependent Claim
33 words
A method according to claim 1 or 2 wherein in the step of emitting the electromagnetic field, the antenna is conditioned to emit the electromagnetic field asymmetrically about the axis of the antenna.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-20 | 1997-03-22 | 1997-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-20 | 2001-03-22 | 2001-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-20 | 2005-03-22 | 2005-09-21 | $7700.00 | Window Closed / Lapsed |