US3822696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrocardiography st analyzer and method
Assignee: Battelle Development Corp
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Filing: 1971-09-29
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Granted: 1974-07-09
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Expires: 1991-09-29
Abstract
Abstract In electrocardiology: a method and apparatus for measuring st depression, i.e., st level relative to pg level. The st depression is obtained for each wave by storing the wave in a signal time delay apparatus and measuring the level of the st segment of the wave relative to the pq segment of the delayed copy of the wave.
Inventors
- 👤 P Ekstrom
- 👤 R Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:15
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/346; A61B5/349; A61B5/358
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
142 words
An apparatus for determining ST depression EKG signals, including, a. means for detecting and amplifying signals, such as EKG waves having R-spikes, b. means for continuously delaying the amplified signals for a desired length of time to thereby produce a delayed set of signals, c. means for subtracting electrical potentials, d. means for continuously feeding said delayed signals into said subtractor means, e. means for simultAneously feeding undelayed, amplified signals, corresponding to the same signals as those delayed, into said subtractor means, f. means for detecting relatively large, rapid potential changes within the signals, such as caused by R-spikes, g. means for obtaining the difference between the delayed and undelayed signals a predetermined time after such potential changes and for continuing the subtraction a predetermined duration, h. whereby portions of EKG signals which occur both before and after R-spikes may be compared.
Claim 2
Independent Claim
142 words
An apparatus for determining ST depression EKG signals, including, a. means for detecting and amplifying signals, such as EKG waves having R-spikes, b. means for continuously delaying the amplified signals for a desired length of time to thereby produce a delayed set of signals, c. means for subtracting electrical potentials, d. means for continuously feeding said delayed signals into said subtractor means, e. means for simultAneously feeding undelayed, amplified signals, corresponding to the same signals as those delayed, into said subtractor means, f. means for detecting relatively large, rapid potential changes within the signals, such as caused by R-spikes, g. means for obtaining the difference between the delayed and undelayed signals a predetermined time after such potential changes and for continuing the subtraction a predetermined duration, h. whereby portions of EKG signals which occur both before and after R-spikes may be compared.
Claim 3
Dependent Claim
27 words
The apparatus of claim 1 including a. means for translating signals corresponding to EKG waves from analog to digital form immediately after they are detected and amplified.
Claim 4
Independent Claim
131 words
A method of determining ST depression in EKG signals, including the steps of, a. detecting and amplifying signals, such as to EKG waves, b. continuously dividing said signals into two signal sets, c. continuously delaying one of said two signal sets relative to the other signal set, to thereby obtain two identical sets differing from each other only in time, d. detecting relatively large, rapid potential changes in one of said signal sets, such as caused by R-spikes in EKG waves, e. obtaining the result of subtracting one of the said signal sets from the other set a predetermined time after such relatively large, rapid potential changes, f. continuing said subtraction for a predetermined duration, g. whereby portions of EKG signals which occur both before and after R-spikes may be compared.
Claim 5
Independent Claim
131 words
A method of determining ST depression in EKG signals, including the steps of, a. detecting and amplifying signals, such as to EKG waves, b. continuously dividing said signals into two signal sets, c. continuously delaying one of said two signal sets relative to the other signal set, to thereby obtain two identical sets differing from each other only in time, d. detecting relatively large, rapid potential changes in one of said signal sets, such as caused by R-spikes in EKG waves, e. obtaining the result of subtracting one of the said signal sets from the other set a predetermined time after such relatively large, rapid potential changes, f. continuing said subtraction for a predetermined duration, g. whereby portions of EKG signals which occur both before and after R-spikes may be compared.
Claim 6
Dependent Claim
34 words
The method of claim 3 including the additional step of, a. converting signals corresponding to EKG waves from information in analog form to information in digital form immediately after they are detected and amplified.
Claim 7
Dependent Claim
20 words
The method of claim 3 wherein the said first and second signal sets are, respectively, portions of different EKG waves.
Claim 8
Dependent Claim
18 words
The method of claim 3 wherein the undelayed signal set is detected for relatively large, rapid potential changes.
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) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |