US6142992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply for limiting power in electrosurgery
Assignee: Arthrocare Corp
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Filing: 1998-04-10
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Granted: 2000-11-07
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Expires: 2018-04-10
Abstract
Abstract A high frequency power supply for applying electrical energy to a target site on or within a patient's body includes an electrical output driver, an output current sensor detecting the current output from the driver, and a power limiting device coupled to the current sensor during normal conditions, the power limiting device operates on a continuous basis. When current output exceeds a predetermined threshold level, the power limiting device is adapted to reduce power on the output driver to a standby mode. The power limiting device operates on a periodic detection or duty cycle when in the standby mode. The power limiting device switches into the stand-by mode to prevent excessive power drains. The power supply operates at a low power, pulsatile manner when an attached probe is in conductive or isotonic fluid but is not engaging body tissue or near a high impedance source. In this pulsatile mode, the power supply operates in a cyclical manner, typically at a predetermined duty cycle.
Inventors
- 👤 Andrew M. L. Cheng
- 👤 Philip E. Eggers
- 👤 Hira V. Thapliyal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:19
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/1206; A61B18/14; A61B18/1402; A61B18/148; A61B18/1482; A61B18/1485; A61B18/149; A61B18/1492; A61B17/00; A61B2017/00017; A61B2017/00022; A61B2017/00026; A61B2017/00084; A61B2017/00101; A61B17/00234; A61B2017/00238; A61B2017/00243; A61B2017/00247; A61B2018/00005; A61B2018/00011; A61B2018/00029; A61B2018/00053; A61B2018/00059; A61B2018/00071; A61B2018/00083; A61B2018/00107; A61B2018/00119; A61B2018/0016; A61B2018/00172; A61B2018/00178; A61B2018/00315; A61B2018/00321; A61B2018/00327; A61B2018/00345; A61B2018/00351; A61B2018/00392; A61B2018/00505; A61B2018/00571; A61B2018/00577; A61B2018/00583; A61B2018/00636; A61B2018/00666; A61B2018/00678; A61B2018/00696; A61B2018/00702; A61B2018/0072; A61B2018/00726; A61B2018/00773; A61B2018/00779; A61B2018/00791; A61B2018/00827; A61B2018/00875; A61B2018/00982; A61B2018/1213; A61B2018/124; A61B2018/1246; A61B2018/1253; A61B2018/126; A61B2018/1273; A61B2018/1467; A61B2018/1472; A61B18/16; A61B2018/162; A61B2018/165; A61B2218/00; A61B2218/001; A61B2218/002; A61B2218/007; A61F; A61F2/00; A61F2/02; A61F2/24; A61F2/2493; A61M; A61M3/00; A61M3/02; A61M3/0279; A61M3/0283
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
123 words
A high frequency power supply for applying electrical energy to a target site on or within a patient's body, the power supply comprising: an electrical output driver; an output current sensor detecting current output of the electrical output driver; and a power limiting device coupled to the output current sensor, wherein the power limiting device is adapted to move from an operating mode to a standby mode by reducing power from a first operating power level to a second standby power level on the output driver when current output from the output current sensor exceeds a predetermined threshold level; a periodic detection device adapted to continuously detect current output in the standby mode without increasing the power to the first operating power level.
Claim 2
Dependent Claim
123 words
A high frequency power supply for applying electrical energy to a target site on or within a patient's body, the power supply comprising: an electrical output driver; an output current sensor detecting current output of the electrical output driver; and a power limiting device coupled to the output current sensor, wherein the power limiting device is adapted to move from an operating mode to a standby mode by reducing power from a first operating power level to a second standby power level on the output driver when current output from the output current sensor exceeds a predetermined threshold level; a periodic detection device adapted to continuously detect current output in the standby mode without increasing the power to the first operating power level.
Claim 3
Dependent Claim
16 words
A power supply of claim 1 further comprising at least two converters to stabilize power output.
Claim 4
Dependent Claim
16 words
A power supply of claim 1 wherein the power limiting device is located behind isolation barriers.
Claim 5
Dependent Claim
23 words
A power supply of claim 1 further comprising a power circuit having a full wave bridge configuration coupled to the power limiting device.
Claim 6
Dependent Claim
24 words
A power supply of claim 1 further comprising a DC/DC converter, wherein the power limiting device protects the DC/DC converter from excessive power conditions.
Claim 7
Dependent Claim
14 words
A power supply of claim 1 wherein the power limiting device measures power output.
Claim 8
Dependent Claim
14 words
A power supply of claim 1 wherein the power limiting device includes an FPGA.
Claim 9
Dependent Claim
26 words
A power supply of claim 7 wherein the FPGA has a duty cycle of about 10-15 ms with power on and about 85-90 ms power off.
Claim 10
Dependent Claim
19 words
A power supply of claim 1 wherein the power limiting device includes a voltage comparator and an output regulator.
Claim 11
Dependent Claim
19 words
A power supply of claim 1 wherein the current sensor is adapted for coupling to a plurality of electrodes.
Claim 12
Dependent Claim
17 words
A power supply of claim 1 wherein the power limiting device is a fixed periodical pulsing circuit.
Claim 13
Dependent Claim
14 words
A power supply of claim 1 wherein the current threshold is about 5.0 amps.
Claim 14
Dependent Claim
37 words
A power supply of claim 1 further comprising a switch for changing output from the power supply between at least one ablation mode with an ablation voltage and at least one subablation mode with a subablation voltage.
Claim 15
Dependent Claim
15 words
A power supply of claim 13 wherein the subablation voltage is between about 50-65 volts.
Claim 16
Dependent Claim
17 words
A power supply of claim 1 wherein the power limiting device is a zero voltage switching circuit.
Claim 17
Dependent Claim
16 words
The power supply of claim 1 wherein the second standby power level is about 10 watts.
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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) | 2003-11-07 | 2004-05-08 | 2004-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-11-07 | 2008-05-08 | 2008-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-11-07 | 2012-05-08 | 2012-11-07 | $7700.00 | Window Closed / Lapsed |