Patent US5722975A successfully refreshed from Google Patents.
US5722975A
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Systems for radiofrequency ablation with phase sensitive power detection and control
Assignee: EP Technologies Inc
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Filing: 1995-06-07
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Granted: 1998-03-03
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Expires: 2015-06-07
Abstract
Abstract Systems for ablating tissue control radiofrequency power to an ablation electrode by relying upon actual phase sensitive power measurements, unaffected by phase shifts between radiofrequency voltage and current. The systems also detect these phase differences, if they develop, and integrate this factor in making their control decisions.
Inventors
- 👤 Stuart D. Edwards
- 👤 Roger A. Stern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:05
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/1206; A61B18/14; A61B18/1492; A61B17/00; A61B2017/00017; A61B2017/00022; A61B2017/00084; A61B2017/00101; A61B17/00234; A61B2017/00292; A61B2018/00636; A61B2018/0066; A61B2018/00696; A61B2018/00702; A61B2018/00755; A61B2018/00767; A61B2018/00773; A61B2018/00779; A61B2018/00791; A61B2018/00797; A61B2018/00815; A61B2018/00827; A61B2018/00869; A61B2018/00875; A61B2018/00892; A61B2018/1246; A61B2018/1253; A61B2018/1467
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A system for ablating tissue at an ablation site using radiofrequency energy comprising an electrode, a source of radiofrequency energy coupled to the electrode for transmitting radiofrequency energy at the ablation site resulting in measurable voltage and current waveforms, a monitoring element coupled to the electrode to monitor the current and voltage waveforms, a sensing element coupled to the monitoring element to derive a phase shift between the monitored current and voltage waveforms, and a controller coupled to the sensing element and responsive to the derived phase shift and operable to interrupt conduction of radio frequency energy when the derived phase shift exceeds a predetermined value.
Claim 2
Independent Claim
106 words
A system for ablating tissue at an ablation site using radiofrequency energy comprising an electrode, a source of radiofrequency energy coupled to the electrode for transmitting radiofrequency energy at the ablation site resulting in measurable voltage and current waveforms, a monitoring element coupled to the electrode to monitor the current and voltage waveforms, a sensing element coupled to the monitoring element to derive a phase shift between the monitored current and voltage waveforms, and a controller coupled to the sensing element and responsive to the derived phase shift and operable to interrupt conduction of radio frequency energy when the derived phase shift exceeds a predetermined value.
Claim 3
Dependent Claim
21 words
A system according to claim 1 and further including an element coupled to the sensing element and that computes real power.
Claim 4
Dependent Claim
25 words
A system according to claim 2 and further including a device coupled to the element that computes real power to display the computed real power.
Claim 5
Dependent Claim
21 words
A system according to claim 1 and further including an element coupled to the sensing element and that computes apparent power.
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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) | 2001-03-02 | 2001-09-01 | 2002-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-02 | 2005-09-01 | 2006-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-02 | 2009-09-01 | 2010-03-03 | $7700.00 | Window Closed / Lapsed |