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US5520191A
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Myocardial ischemia and infarction analysis and monitoring method and apparatus
Assignee: Ortivus AB
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Filing: 1994-10-07
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Granted: 1996-05-28
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Expires: 2014-10-07
Abstract
Abstract A cardiac monitoring method and system provides advanced ischemia and infarction analysis and monitoring. Advanced calculations are performed on ECG signals to obtain parameter values relating to myocardial ischemia and infarction. Dominant heart beats are averaged to form a smooth beat, which is analyzed to determine the parameter values continuously and in real-time. The result of each analyzed time interval is presented as points in a trend graph on a monitoring display. All calculations are performed on-line and the trend curves are updated immediately.
Inventors
- 👤 Per Karlsson
- 👤 Gunilla Lundahl
- 👤 Michael Oljemark
- 👤 Johan Ubby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:28
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/06; A61B5/061; A61B5/0002; A61B5/0004; A61B5/0006; A61B5/24; A61B5/25; A61B5/276; A61B5/279; A61B5/28; A61B5/316; A61B5/318; A61B5/327; A61B5/339; A61B5/341; A61B5/346; A61B5/349; A61B5/35; A61B5/366; A61B5/74; A61B5/7475; A61B5/363; A61B5/72; A61B5/7203; A61B5/7217; A61B5/7221
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
217 words
A myocardial ischemia and infarction analysis and monitoring method comprising the steps of: receiving a number of ECG signals relating to the heartbeat of at least one patient; converting the received number of ECG signals into three perpendicular ECG signals; determining, for each occasion that a number of ECG signals is received, whether or not the number of ECG signals correspond to a normal heartbeat; determining, for each occasion that a number of ECG signals is received, whether or not the signal quality of the ECG signals exceeds a minimum level; determining an average heartbeat from only those ECG signals which correspond to a normal heartbeat and for which the signal quality exceeds a minimum level; calculating a plurality of parameters related to the ischemic condition of each patient from said number of ECG signals; generating electric signals representative of the value of said plurality of parameters related to the ischemic condition of each patient; storing said electric signals representative of the value of said plurality of parameters related to the ischemic condition of each patient in a memory; and repeating the steps of determining said average heartbeat, calculating said plurality of parameters, generating electric signals and storing said electric signals for as long as ECG signals continue to be received or until the memory is full.
Claim 2
Dependent Claim
217 words
A myocardial ischemia and infarction analysis and monitoring method comprising the steps of: receiving a number of ECG signals relating to the heartbeat of at least one patient; converting the received number of ECG signals into three perpendicular ECG signals; determining, for each occasion that a number of ECG signals is received, whether or not the number of ECG signals correspond to a normal heartbeat; determining, for each occasion that a number of ECG signals is received, whether or not the signal quality of the ECG signals exceeds a minimum level; determining an average heartbeat from only those ECG signals which correspond to a normal heartbeat and for which the signal quality exceeds a minimum level; calculating a plurality of parameters related to the ischemic condition of each patient from said number of ECG signals; generating electric signals representative of the value of said plurality of parameters related to the ischemic condition of each patient; storing said electric signals representative of the value of said plurality of parameters related to the ischemic condition of each patient in a memory; and repeating the steps of determining said average heartbeat, calculating said plurality of parameters, generating electric signals and storing said electric signals for as long as ECG signals continue to be received or until the memory is full.
Claim 3
Dependent Claim
39 words
A myocardial ischemia and infarction analysis and monitoring method as recited in claim 1, which presents said plurality of parameters in trend graphs having time along the horizontal axis and the value of the parameter along the vertical axis.
Claim 4
Dependent Claim
29 words
A myocardial ischemia and infarction analysis and monitoring method as recited in claim 1, which stores the the average heartbeat in the form of said three perpendicular ECG signals.
Claim 5
Dependent Claim
49 words
A myocardial ischemia and infarction analysis and monitoring method as recited in claim 1, which further comprises the steps of: continuously recording said three perpendicular ECG signals; and calculating a second number of ECG signals from said three perpendicular ECG signals in response to a request by a user.
Claim 6
Dependent Claim
33 words
A myocardial ischemia and infarction analysis and monitoring method as recited in claim 4, which comprises the further step of displaying said second number of ECG signals in response to a user request.
Claim 7
Dependent Claim
23 words
A myocardial ischemia and infarction analysis and monitoring method as recited in claim 4, wherein said second number of ECG signals is twelve.
Claim 8
Dependent Claim
29 words
A myocardial ischemia and infarction analysis and monitoring method as recited in claim 1, wherein at least one of said plurality of parameters is a ST vector magnitude parameter.
Claim 9
Dependent Claim
29 words
A myocardial ischemia and infarction analysis and monitoring method as recited in claim 1, wherein at least one of said plurality of parameters is a STC vector magnitude parameter.
Claim 10
Dependent Claim
29 words
A myocardial ischemia and infarction analysis and monitoring method as recited in claim 1, wherein at least one of said plurality of parameters is a QRS vector difference parameter.
Claim 11
Dependent Claim
108 words
A myocardial ischemia and infarction analysis and monitoring method as recited in claim 1, which comprises the further step of: storing those ECG signals determined to correspond to a dominant heartbeat; wherein said step of determining an average heartbeat is repeated at the end of each interval in which a number of ECG signals corresponding to a dominant heartbeat is received at least a predetermined number of times and includes said number of ECG signals corresponding to a dominant heartbeat received during said interval, and wherein said steps of calculating said plurality of parameters and generating electric signals are carried out using the most recently determined average heartbeat.
Claim 12
Dependent Claim
92 words
A myocardial ischemia and infarction analysis and monitoring method as recited in claim 1, which comprises the further steps of: displaying at least one of said plurality of parameters for each patient on a respective patient monitor substantially in real time; receiving and storing data from each patient monitor at a central location, said data including said at least one of said plurality of parameters; displaying said at least one of said plurality of parameters received from each patient monitor; and printing information related to said data received from each patient monitor.
Claim 13
Dependent Claim
213 words
A myocardial ischemia and infarction analysis and monitoring system comprising: at least one patient monitor, each patient monitor having an analyzing circuit for receiving a number of ECG signals relating to the heartbeat of a corresponding patient, for determining, for each occasion that the number of ECG signals is received, whether or not the number of ECG signals correspond to a normal heartbeat, for determining, for each occasion that the number of ECG signals is received, whether or not the signal quality of the ECG signals exceeds a minimum level, for determining an average heartbeat from only those ECG signals which correspond to a normal heartbeat and for which the signal quality exceeds the minimum level, and for calculating therefrom a plurality of parameters related to the ischemic condition of the corresponding patient, and a display for displaying at least one of said plurality of parameters substantially in real time; a central workstation for receiving and storing data from each patient monitor, said data including said at least one of said plurality of parameters; a central monitoring unit for simultaneously displaying said at least one of said plurality of parameters received from each patient monitor; and a network for transferring data between each patient monitor, said central workstation, and said central monitoring unit.
Claim 14
Dependent Claim
213 words
A myocardial ischemia and infarction analysis and monitoring system comprising: at least one patient monitor, each patient monitor having an analyzing circuit for receiving a number of ECG signals relating to the heartbeat of a corresponding patient, for determining, for each occasion that the number of ECG signals is received, whether or not the number of ECG signals correspond to a normal heartbeat, for determining, for each occasion that the number of ECG signals is received, whether or not the signal quality of the ECG signals exceeds a minimum level, for determining an average heartbeat from only those ECG signals which correspond to a normal heartbeat and for which the signal quality exceeds the minimum level, and for calculating therefrom a plurality of parameters related to the ischemic condition of the corresponding patient, and a display for displaying at least one of said plurality of parameters substantially in real time; a central workstation for receiving and storing data from each patient monitor, said data including said at least one of said plurality of parameters; a central monitoring unit for simultaneously displaying said at least one of said plurality of parameters received from each patient monitor; and a network for transferring data between each patient monitor, said central workstation, and said central monitoring unit.
Claim 15
Dependent Claim
30 words
A myocardial ischemia and infarction analysis and monitoring system as recited in claim 12, wherein said at least one of said plurality of parameters includes a ST vector magnitude parameter.
Claim 16
Dependent Claim
30 words
A myocardial ischemia and infarction analysis and monitoring system as recited in claim 12, wherein said at least one of said plurality of parameters includes a STC vector magnitude parameter.
Claim 17
Dependent Claim
30 words
A myocardial ischemia and infarction analysis and monitoring system as recited in claim 12, wherein said at least one of said plurality of parameters includes a QRS vector difference parameter.
Claim 18
Dependent Claim
45 words
A myocardial ischemia and infarction analysis and monitoring system as recited in claim 12, wherein said central workstation comprises a CPU, a data storage unit, a display, a graphical interface, and a printer for printing information related to said data received from each patient monitor.
Claim 19
Dependent Claim
35 words
A myocardial ischemia and infarction analysis and monitoring system as recited in claim 12, which further comprises a printer which produces a single page printout with a plurality of ECG signals printed under each other.
Claim 20
Dependent Claim
180 words
A myocardial ischemia and infarction analysis and monitoring system comprising: at least one patient monitor, each patient monitor having an analyzing circuit for receiving a number of ECG signals relating to the heartbeat of a corresponding patient and calculating therefrom a plurality of parameters related to the ischemic condition of the corresponding patient, and a display for displaying at least one of said plurality of parameters substantially in real time; a central workstation for receiving and storing data from each patient monitor, said data including said at least one of said plurality of parameters; a central monitoring unit for simultaneously displaying said at least one of said plurality of parameters received from each patient monitor; and a network for transferring data between each patient monitor, said central workstation, and said central monitoring unit; wherein the analyzing circuit of each patient monitor continuously records a number of perpendicular lead signals corresponding to said number of ECG signals and calculates a second number of ECG signals from said recorded number of perpendicular lead signals in response to a request by a user.
Claim 21
Dependent Claim
180 words
A myocardial ischemia and infarction analysis and monitoring system comprising: at least one patient monitor, each patient monitor having an analyzing circuit for receiving a number of ECG signals relating to the heartbeat of a corresponding patient and calculating therefrom a plurality of parameters related to the ischemic condition of the corresponding patient, and a display for displaying at least one of said plurality of parameters substantially in real time; a central workstation for receiving and storing data from each patient monitor, said data including said at least one of said plurality of parameters; a central monitoring unit for simultaneously displaying said at least one of said plurality of parameters received from each patient monitor; and a network for transferring data between each patient monitor, said central workstation, and said central monitoring unit; wherein the analyzing circuit of each patient monitor continuously records a number of perpendicular lead signals corresponding to said number of ECG signals and calculates a second number of ECG signals from said recorded number of perpendicular lead signals in response to a request by a user.
Claim 22
Dependent Claim
26 words
A myocardial ischemia and infarction analysis and monitoring system as recited in claim 18, wherein each patient monitor continuously displays said second number of ECG signals.
Claim 23
Dependent Claim
23 words
A myocardial ischemia and infarction analysis and monitoring system as recited in claim 18, wherein said second number of ECG signals is twelve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-28 | 1999-11-27 | 2000-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-28 | 2003-11-27 | 2004-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-28 | 2007-11-27 | 2008-05-28 | $7700.00 | Window Closed / Lapsed |