US6047206A
Expired / Lapsed
US
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Generation of localized cardiac measures
Assignee: Spacelabs Healthcare LLC
•
Filing: 1997-07-17
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Granted: 2000-04-04
•
Expires: 2017-07-17
Abstract
Abstract A subject suspected of experiencing a myocardial infarction is monitored by applying sensors to the subject, where the sensors are configured to produce electrical signals representative of cardiac activity of the subject. Electrical signals are received from at least two of the sensors. The received signals then are processed to obtain a localized cardiac measure that is analyzed to determine whether the subject is experiencing a myocardial infarction.
Inventors
- 👤 Paul Albrecht
- 👤 Jeffery M. Arnold
- 👤 Richard J. Cohen
- 👤 Paul Lander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:48
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/25; A61B5/279; A61B5/28; A61B5/282; A61B5/316; A61B5/318; A61B5/346; A61B5/05
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
79 words
A method for monitoring a subject suspected of experiencing a myocardial infarction, the method comprising: applying sensors to the subject, the sensors being configured to produce electrical signals representative of cardiac activity of the subject; receiving electrical signals from at least two of the sensors; processing the received signals to obtain a localized electrocardiogram; creating a localized cardiac measure from the localized electrocardiogram; and analyzing the localized cardiac measure to determine whether the subject is experiencing a myocardial infarction.
Claim 2
Independent Claim
79 words
A method for monitoring a subject suspected of experiencing a myocardial infarction, the method comprising: applying sensors to the subject, the sensors being configured to produce electrical signals representative of cardiac activity of the subject; receiving electrical signals from at least two of the sensors; processing the received signals to obtain a localized electrocardiogram; creating a localized cardiac measure from the localized electrocardiogram; and analyzing the localized cardiac measure to determine whether the subject is experiencing a myocardial infarction.
Claim 3
Dependent Claim
36 words
The method of claim 1, wherein analyzing the localized cardiac measure comprises analyzing a temporal trend in the localized cardiac measure to generate a temporal trend measurement and performing further analysis on the temporal trend measurement.
Claim 4
Dependent Claim
12 words
The method of claim 2, further comprising displaying the temporal trend measurement.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the creating step comprises generating a localized measure of myocardial ischemia as the localized cardiac measure.
Claim 6
Dependent Claim
23 words
The method of claim 1 wherein the creating step comprises creating the localized cardiac measure during a specific portion of a cardiac cycle.
Claim 7
Dependent Claim
21 words
The method of claim 5 wherein the specific portion of the cardiac cycle comprises the ST segment of the cardiac cycle.
Claim 8
Dependent Claim
17 words
The method of claim 6 wherein the localized cardiac measure comprises a measure of ST segment change.
Claim 9
Dependent Claim
18 words
The method of claim 6 wherein the creating step includes determining a normalized value of ST segment change.
Claim 10
Dependent Claim
23 words
The method of claim 6 wherein the processing step further includes determining characteristics of a body surface spatial distribution of ST segment changes.
Claim 11
Dependent Claim
21 words
The method of claim 5 wherein the specific point in the cardiac cycle comprises a QRS complex of the cardiac cycle.
Claim 12
Dependent Claim
20 words
The method of claim 10, wherein the localized cardiac measure comprises a measure of an amplitude of the QRS complex.
Claim 13
Dependent Claim
14 words
The method of claim 1 further comprising obtaining localized cardiac measures at multiple locations.
Claim 14
Dependent Claim
21 words
The method of claim 1 further comprising enhancing a signal-to-noise characteristic of the localized cardiac measure by modifying the localized electrocardiogram.
Claim 15
Dependent Claim
18 words
The method of claim 13 wherein the step of enhancing comprises using a measure of statistical central tendency.
Claim 16
Dependent Claim
15 words
The method of claim 14, wherein the measure of statistical central tendency comprises an average.
Claim 17
Dependent Claim
15 words
The method of claim 14, wherein the measure of statistical central tendency comprises a median.
Claim 18
Dependent Claim
15 words
The method of claim 13, wherein modifying the localized electrocardiogram comprises generating a representative beat.
Claim 19
Dependent Claim
14 words
The method of claim 17, wherein generating a representative beat comprises rejecting abnormal beats.
Claim 20
Dependent Claim
21 words
The method of claim 17, wherein generating a representative beat comprises rejecting beats having a noise level above a predetermined threshold.
Claim 21
Dependent Claim
12 words
The method of claim 13, further comprising displaying the modified localized electrocardiogram.
Claim 22
Dependent Claim
17 words
The method of claim 13, wherein generating the localized cardiac measure comprises using the modified localized electrocardiogram.
Claim 23
Dependent Claim
12 words
The method of claim 1 further comprising normalizing the localized cardiac measure.
Claim 24
Dependent Claim
33 words
The method of claim 22, further comprising: generating a standard electrocardiogram; and generating a parameter from the standard electrocardiogram; wherein the step of normalizing includes using the parameter generated from a standard electrocardiogram.
Claim 25
Dependent Claim
19 words
The method of claim 23, wherein the parameter comprises an amplitude of a QRS complex of the standard electrocardiogram.
Claim 26
Dependent Claim
19 words
The method of claim 22 wherein the step of normalizing includes using a parameter generated from the localized electrocardiogram.
Claim 27
Dependent Claim
19 words
The method of claim 25, wherein the parameter comprises an amplitude of a QRS complex of the localized electrocardiogram.
Claim 28
Dependent Claim
20 words
The method of claim 1 further comprising processing the received signals to remove baseline noise using an impedance signal estimate.
Claim 29
Dependent Claim
24 words
The method of claim 1 wherein the processing step includes reconstruction of a standard electrocardiogram by transformation of the signals received from the sensors.
Claim 30
Dependent Claim
15 words
The method of claim 1 further comprising presenting a display of the localized cardiac measure.
Claim 31
Dependent Claim
28 words
The method of claim 29 wherein localized cardiac measures are obtained at multiple locations and the display includes a map of the localized cardiac measures at different locations.
Claim 32
Dependent Claim
23 words
The method of claim 30 wherein the map comprises a map that uses colors to represent ranges of values of the localized measures.
Claim 33
Dependent Claim
33 words
The method of claim 29 wherein localized cardiac measures are obtained at multiple locations and the display includes a graphical representation of the localized measures at positions corresponding to locations of the sensors.
Claim 34
Dependent Claim
16 words
The method of claim 29 wherein the display comprises a graphical image with superimposed cardiac measures.
Claim 35
Dependent Claim
22 words
The method of claim 1 further comprising displaying a plot of a time-dependence of a quantity derived from the localized cardiac measure.
Claim 36
Dependent Claim
22 words
The method of claim 1 further including estimating the localized cardiac measure at locations other than the locations of the received signals.
Claim 37
Dependent Claim
22 words
The method of claim 1, further comprising displaying the localized cardiac measure to show a temporal trend in the localized cardiac measure.
Claim 38
Independent Claim
87 words
A system for monitoring a subject suspected of experiencing a myocardial infarction, the system including: sensors configured to be applied to a subject and to produce electrical signals representative of cardiac activity of the subject; means for receiving electrical signals from at least two of the sensors; means for processing the received signals to obtain a localized electrocardiogram; means for creating a localized cardiac measure from the localized electrocardiogram; and means for analyzing the localized cardiac measure to determine whether the subject is experiencing a myocardial infarction.
Claim 39
Independent Claim
87 words
A system for monitoring a subject suspected of experiencing a myocardial infarction, the system including: sensors configured to be applied to a subject and to produce electrical signals representative of cardiac activity of the subject; means for receiving electrical signals from at least two of the sensors; means for processing the received signals to obtain a localized electrocardiogram; means for creating a localized cardiac measure from the localized electrocardiogram; and means for analyzing the localized cardiac measure to determine whether the subject is experiencing a myocardial infarction.
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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) | 2003-04-04 | 2003-10-04 | 2004-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-04-04 | 2007-10-04 | 2008-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-04-04 | 2011-10-04 | 2012-04-04 | $7700.00 | Window Closed / Lapsed |