US3880147A
Expired / Lapsed
US
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R-R interval histogram instrument system
Assignee: Xerox Corp
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Filing: 1973-03-22
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Granted: 1975-04-29
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Expires: 1993-03-22
Abstract
Abstract A method and apparatus for generating an R-R interval histogram by collecting and processing electrocardiograph signal data over a relatively long time period. The system includes a data collection section and a data readout section with the data collection section being portable permitting a patient to wear the device for long time periods without impairing freedom of motion. R-R intervals are continuously sensed and each interval is used to increment one of a plurality of R-R interval memory locations. The count in each memory location then depends upon the number of particular R-R intervals generated over the total time period that the patient is montiored. At the conclusion of the monitoring time, the data collection section is connected to the data readout section and the count in each memory location is sequentially readout and processed to form a bar graph indication of the logarithm of the total count in that location, the complete graph being a histogram of R-R intervals. An alternate data collection technique involves recording the time difference between each R-R interval which, when read out, produces a R-R distance histogram.
Inventors
- 👤 Roger A Gruenke
- 👤 Roy J Lahr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:56
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/024; A61B5/0245; A61B5/24; A61B5/316; A61B5/318; A61B5/346; A61B5/349; A61B5/364
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
131 words
An apparatus for generating an R-R interval histogram comprising: data collection means including, means for measuring the time intervals between the R portions of an electrocardiogram waveform, means for determining the number of predetermined time periods which elapse during each of said time intervals, means for generating time interval range signals corresponding to said numbers, means for storing said range interval signals as accumulating counts in a plurality of addressable counters with an address for each counter corresponding to a particular timE interval range; and readout means selectively connectable to said data collection means including, means for addressing said addressable counters and reading out said counts stored therein, means for displaying said readout counts as a bar graph having range intervals along one axis and corresponding counts along the other axis.
Claim 2
Independent Claim
131 words
An apparatus for generating an R-R interval histogram comprising: data collection means including, means for measuring the time intervals between the R portions of an electrocardiogram waveform, means for determining the number of predetermined time periods which elapse during each of said time intervals, means for generating time interval range signals corresponding to said numbers, means for storing said range interval signals as accumulating counts in a plurality of addressable counters with an address for each counter corresponding to a particular timE interval range; and readout means selectively connectable to said data collection means including, means for addressing said addressable counters and reading out said counts stored therein, means for displaying said readout counts as a bar graph having range intervals along one axis and corresponding counts along the other axis.
Claim 3
Dependent Claim
40 words
The apparatus defined in claim 1 wherein said data collection means includes: means for holding a time interval signal; means for subtracting said held time interval signal from a present time interval signal to generate a difference time interval signal.
Claim 4
Dependent Claim
29 words
The apparatus defined in claim 1 wherein said readout means includes: means for generating a readout signal proportional to the logarithm of the particular count in said counter means.
Claim 5
Dependent Claim
49 words
The apparatus defined in claim 3 including shift register means for receiving said particular count and shifting said count until a ''''one'''' appears in the most significant bit position of said shift register, the number of shifts being proportional to the characteristic of the logarithm of said particular count.
Claim 6
Dependent Claim
26 words
The apparatus defined in claim 4 including: digital to analog converter means for converting the contents of said shift register to an approximation of said logarithm.
Claim 7
Independent Claim
86 words
A method of generating an R-R interval histogram comprising the steps of: collecting in a data collection means R-R interval data and sorting R-R interval ranges onto counts in an addressable counter memory, said counts being proportional to the frequency of occurrence of said ranges; and reading out into a readout means selectively connectable to said data collection means said counts by sequentially addressing said counter memory and generating a bar graph having R-R interval ranges along one axis and corresponding counts along the other axis.
Claim 8
Independent Claim
86 words
A method of generating an R-R interval histogram comprising the steps of: collecting in a data collection means R-R interval data and sorting R-R interval ranges onto counts in an addressable counter memory, said counts being proportional to the frequency of occurrence of said ranges; and reading out into a readout means selectively connectable to said data collection means said counts by sequentially addressing said counter memory and generating a bar graph having R-R interval ranges along one axis and corresponding counts along the other axis.
Claim 9
Dependent Claim
32 words
The method defined in claim 6 including the steps of: holding a prior count and taking the difference between said prior count and a present count to produce R-R difference interval signals.
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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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |