US4239048A
Expired / Lapsed
US
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Cardiotachometer using autocorrelation techniques
Assignee: DNA Medical Inc
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Filing: 1979-02-06
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Granted: 1980-12-16
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Expires: 1999-02-06
Abstract
Abstract A cardiotachometer for indicating heart rate of a user in beats per minute. The cardiotachometer comprises a sensor, placed on the body of the user, for producing an electrical signal indicative of the heart rate of the user. Circuitry is provided for converting the electrical signal into first and second digital signals. 60/t computation circuitry responds to the first and second digital signals and produces a third digital signal having a varying frequency representative of the number of heart beats per minute. An up-counter converts the third digital signal into a plurality of binary number signals, each bit of which is stored in a series of shift registers. A compare using a plurality of exclusive OR gates, compares each of the stored binary number signals with the most recent binary number signal, from the up-counter, to determine if a plurality of compared signals are within a predetermined percentage of each other. Finally, a display is provided for displaying the most recent binary number signal, when the plurality of compared signals are within the predetermined percentage of each other. Further provision is made for display of both elapsed time and time of day.
Inventors
- 👤 Robert R. Steuer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:12
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/024; A61B5/02416; A61B5/02438; A61B2560/00; A61B2560/04; A61B2560/0462; A61B2560/0468
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
127 words
A cardiotachometer for indicating heart rate of a user in beats per minute, said cardiotachometer comprising: means, responsive to the heart beats of said user for producing a heart rate signal having portions representative of the beats per minute of said user's heart; means for storing the portions of said heart rate signal; means for comparing each of said stored portions with the most recent portion of said heart rate signal; means for issuing a display signal when at least two of the comparisons in said comparing means is made between portions within a predetermined comparison range; and means, responsive to said display signal, for displaying said most recent portion of said heart rate signal in eye-readable format wherein heart rate in beats per minute is indicated.
Claim 2
Dependent Claim
127 words
A cardiotachometer for indicating heart rate of a user in beats per minute, said cardiotachometer comprising: means, responsive to the heart beats of said user for producing a heart rate signal having portions representative of the beats per minute of said user's heart; means for storing the portions of said heart rate signal; means for comparing each of said stored portions with the most recent portion of said heart rate signal; means for issuing a display signal when at least two of the comparisons in said comparing means is made between portions within a predetermined comparison range; and means, responsive to said display signal, for displaying said most recent portion of said heart rate signal in eye-readable format wherein heart rate in beats per minute is indicated.
Claim 3
Dependent Claim
12 words
The cardiotachometer of claim 1, wherein said at least two is three.
Claim 4
Dependent Claim
14 words
The cardiotachometer of claim 1 further including time delay means for removing spurious pulses.
Claim 5
Dependent Claim
153 words
A cardiotachometer for indicating heart rate of a user in beats per minute, said cardiotachometer comprising: interval means, responsive to the heart beats of said user, for producing an interval signal having portions indicative of the time interval between said beats; means for converting each portion of said interval signal into a heart rate signal having portions representative of the beats per minute of said user's heart; means for storing the portions of said heart rate signal; means for comparing each of said stored portions with the most recent portion of said heart rate signal; means for issuing a display signal when at least two of the comparisons in said comparing means are made between portions within a predetermined percentage of each other; and means, responsive to said display signal, for displaying said most recent one of said plurality of signals in eye-readable format wherein heart rate in beats per minute is indicated.
Claim 6
Dependent Claim
153 words
A cardiotachometer for indicating heart rate of a user in beats per minute, said cardiotachometer comprising: interval means, responsive to the heart beats of said user, for producing an interval signal having portions indicative of the time interval between said beats; means for converting each portion of said interval signal into a heart rate signal having portions representative of the beats per minute of said user's heart; means for storing the portions of said heart rate signal; means for comparing each of said stored portions with the most recent portion of said heart rate signal; means for issuing a display signal when at least two of the comparisons in said comparing means are made between portions within a predetermined percentage of each other; and means, responsive to said display signal, for displaying said most recent one of said plurality of signals in eye-readable format wherein heart rate in beats per minute is indicated.
Claim 7
Dependent Claim
44 words
The cardiotachometer of claim 4, further comprising sensor means, adapted to contact the skin of said user, for producing an electrical signal indicative of the heart beats of said user, and interconnect means for conveying said electrical signal for use by said interval means.
Claim 8
Dependent Claim
14 words
The cardiotachometer of claim 4 further including time delay means for removing spurious pulses.
Claim 9
Dependent Claim
21 words
The cardiotachometer of claim 4, further comprising means for producing a signal indicative of time-of-day for display by said displaying means.
Claim 10
Dependent Claim
22 words
The cardiotachometer of claim 4, further comprising means for producing a signal indicative of elapsed time for display by said displaying means.
Claim 11
Dependent Claim
165 words
A cardiotachometer for indicating heart rate in beats per minute of a user, said cardiotachometer comprising: sensor means, adapted to contact the skin of said user, for producing an electrical signal inidicative of the heart rate of said user; means for converting said electrical signal into first and second digital signals; means responsive to said first and second digital signals for producing a third digital signal having a varying frequency representative of the number of heart beats per minute; converting means for converting said third digital signal into a plurality binary number signals; storing means for storing each of said binary number signals; means for comparing each of said stored binary number signals with the most recent binary number signal from said converting means to determine if a plurality of compared signals are within a predetermined comparison range of each other; and means for displaying said most recent binary number signal when said plurality of compared signals are within said predetermined percentage of each other.
Claim 12
Dependent Claim
165 words
A cardiotachometer for indicating heart rate in beats per minute of a user, said cardiotachometer comprising: sensor means, adapted to contact the skin of said user, for producing an electrical signal inidicative of the heart rate of said user; means for converting said electrical signal into first and second digital signals; means responsive to said first and second digital signals for producing a third digital signal having a varying frequency representative of the number of heart beats per minute; converting means for converting said third digital signal into a plurality binary number signals; storing means for storing each of said binary number signals; means for comparing each of said stored binary number signals with the most recent binary number signal from said converting means to determine if a plurality of compared signals are within a predetermined comparison range of each other; and means for displaying said most recent binary number signal when said plurality of compared signals are within said predetermined percentage of each other.
Claim 13
Dependent Claim
30 words
The cardiotachometer of claim 9, wherein said comparison range is determined by the number of least significant bits excluded from each of said stored and most recent binary number signals.
Claim 14
Dependent Claim
13 words
The cardiotachometer of claim 9, wherein said sensor means comprises a pressure transducer.
Claim 15
Dependent Claim
47 words
The cardiotachometer of claim 9, wherein said sensor means comprises a light source, and a photocell responsive to variations in light intensity reflected off of the capillary bed within the skin of said user, for producing a voltage signal representative of the heart rate of said user.
Claim 16
Dependent Claim
19 words
The cardiotachometer of claim 9, wherein said sensor means detects systolic beats in order to produce said electrical signal.
Claim 17
Dependent Claim
41 words
The cardiotachometer of claim 9, wherein said third digital signal producing means comprises counting means for producing an interval signal representing the time interval between heart beats, and dividing means responsive to said interval signal for producing said third digital signal.
Claim 18
Dependent Claim
25 words
The cardiotachometer of claim 14, wherein said producing means includes a latch for holding said interval signal before it is fed to said dividing means.
Claim 19
Dependent Claim
13 words
The cardiotachometer of claim 15, wherein said dividing means is a divide-by-N device.
Claim 20
Dependent Claim
12 words
The cardiotachometer of claim 9, wherein said converting means comprises an up-counter.
Claim 21
Dependent Claim
13 words
The cardiotachometer of claim 9, wherein said storing means comprises shift register means.
Claim 22
Dependent Claim
39 words
The cardiotachometer of claim 9, wherein said plurality of binary number signals each comprises a plurality of bits, and said storing means comprises a plurality of shift registers, each for receiving a particular bit of each binary number signal.
Claim 23
Dependent Claim
28 words
The cardiotachometer of claim 9, wherein said comparing means includes an exclusive OR gate for receiving said stored binary number signals and said most recent binary number signal.
Claim 24
Dependent Claim
32 words
The cardiotachometer of claim 19, wherein said comparing means further includes means for excluding at least one of the least significant bits of each of said binary number signals from being compared.
Claim 25
Dependent Claim
49 words
The cardiotachometer of claim 9, wherein said comparing means includes means for issuing a compare signal each time said compared signals are within a predetermined percentage of each other, and wherein said displaying means includes means for issuing a display signal after receiving a plurality of said compare signals.
Claim 26
Dependent Claim
13 words
The cardiotachometer of claim 22, wherein said plurality of compare signals is three.
Claim 27
Dependent Claim
38 words
The cardiotachometer of claim 9, wherein said displaying means includes latch means for holding said most recent binary number signal prior to display, and means for displaying the contents of said latch means as an array of integers.
References Cited (Backward Citations)
US3230951A
Cited
US3202149A
Cited
US3717140A
Cited
US3717140B1
Cited
US3858574A
Cited
US3908636A
Cited
US3908640A
Cited
US4009708A
Cited
US4120296A
Cited
US4015595A
Cited
US4086916A
Cited
US4096854A
Cited
US4058118A
Cited
US4030483A
Cited
US4090504A
Cited
US4120294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |