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US3884221A
Expired / Lapsed
US
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Method for the construction and diagnosis of three dimensional ectocariagrams
Assignee: Individual
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Filing: 1969-06-10
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Granted: 1975-05-20
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Expires: 1989-06-10
Abstract
Abstract This disclosure relates to a method for extracting significant data values, analogous temporarily and electrically to the physiologic myocardial action potential which accompanies each cardiac contraction, from conventionally recorded electrocardiograms. This disclosure relates further to a method and programs for the determination, from the scalar data of the above voltage values, of three dimensional vector determinant values which alternatively permit either the construction of a physical model of each considered electrocardiographic deflection set, or, by sequential comparison of such determinants with previously determined normal and abnormal determinant series of vector set points, permits the interpretation of conventional electrocardiograms in digital computers.
Inventors
- 👤 George Eastman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:08
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/327; A61B5/339; A61B5/341; A61B5/346
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
180 words
A method for determining the existence, nature and degree of cardiac abnormalities in a subject comprising, obtaining from the subject a plurality of electrocardiographic tracings, each of which tracings comprises a plurality of sets of deflections with each such set representative of one cardiac cycle of the subject, measuring and recording from said tracing the values for each deflection in a selected number of sets, constructing from said deflection values a plurality of parameters defining a three dimensional model of the subject''s cardiac cycle, constructing a three dimensional model of the cardiac cycle of said subject from said plurality of parameters constructed from said deflection values, constructing from said deflection values a model expressing the inter and intra deflection occurrence times thereby defining the subject''s cardiac rhythm and conduction, comparing the values of said parameters and said three dimensional cardiac cycle model for said subject to the values of previously determined similar parameters and three dimensional cardiac cycle models for normal and abnormal cardiac conditions, determining from said comparison the existence in the subject of various types of cardiac abnormalities.
Claim 2
Independent Claim
180 words
A method for determining the existence, nature and degree of cardiac abnormalities in a subject comprising, obtaining from the subject a plurality of electrocardiographic tracings, each of which tracings comprises a plurality of sets of deflections with each such set representative of one cardiac cycle of the subject, measuring and recording from said tracing the values for each deflection in a selected number of sets, constructing from said deflection values a plurality of parameters defining a three dimensional model of the subject''s cardiac cycle, constructing a three dimensional model of the cardiac cycle of said subject from said plurality of parameters constructed from said deflection values, constructing from said deflection values a model expressing the inter and intra deflection occurrence times thereby defining the subject''s cardiac rhythm and conduction, comparing the values of said parameters and said three dimensional cardiac cycle model for said subject to the values of previously determined similar parameters and three dimensional cardiac cycle models for normal and abnormal cardiac conditions, determining from said comparison the existence in the subject of various types of cardiac abnormalities.
Claim 3
Dependent Claim
23 words
A method as described in claim 1 comprising measuring and recording the deflection values for only three orthogonal leads of the electrocardiographic tracings.
Claim 4
Dependent Claim
25 words
A method as described in claim 2 comprising measuring and recording deflection values for lead I, lead aVf and one of leads V1 and V2.
Claim 5
Dependent Claim
21 words
A method as described in claim 1 comprising measuring and recording the deflection values for at least six sets of deflections.
Claim 6
Dependent Claim
67 words
A method as described in claim 1 comprising submitting the deflection values to computer means, constructing in said computer means parameters defining the three dimensional model of the subject''s cardiac cycle, comparing in said computer means the constructed parameters with previously determined similar parameters for normal and abnormal cardiac conditions, and determining in said computer means the existance in the subject of various types of cardiac abnormalities.
Claim 7
Dependent Claim
48 words
A method as described in claim 5 comprising storing in said computer means standardized three dimensional parameters of the cardiac cycle for normal and abnormal conditions, and producing from the computer means for each subject an alphabetic-decimal report of the presence of specific cardiac abnormalities in the subject.
Claim 8
Dependent Claim
72 words
A method as described in claim 1 wherein the step of constructing from said deflection values a plurality of parameters defining a three dimensional model of the subject''s cardiac cycle comprises constructing from said deflection values a plurality of two dimensional parameters descriptive of the myocardial action potential accompanying the cardiac contractions of the subject, and then constructing from said two dimensional parameters the plurality of parameters defining the three dimensional model.
Claim 9
Dependent Claim
61 words
A method as described in claim 1 wherein, said plurality of parameters defining a three dimensional model comprises a spatial vector magnitude, an azimuthal angle related to said vector magnitude, and angle of right ascension related to said vector magnitude, a ventricular gradient, and a set of Eigenvectors related to the shape, size and position of the three dimensnional vector loop.
Claim 10
Dependent Claim
60 words
A method as described in claim 1 comprising, measuring and recording temporal values on the sets of deflection at preselected points of each deflection, comparing individual temporal values for similar points between sets and for dissimilar points within a set, and determining from said comparison the existance, the nature and degree of possible rhythm abnormalities in the subject''s cardiac cycle.
Claim 11
Dependent Claim
45 words
A method as described in claim 9 comprising combining the results of the comparison of temporal values with the results of the comparison of the parameters of the three dimensional model to determine the existance, nature and degree of specific cardiac abnormalities in the subject.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |