US3762397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the detection and recordation of high frequency sound in the cardiovascular system
Assignee: HP Inc
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Filing: 1971-04-19
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Granted: 1973-10-02
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Expires: 1991-04-19
Abstract
Abstract High frequency sound, such as that produced by turbulence, in the cardiovascular system is sensed, amplified, demodulated, and filtered to produce an average of the amplitude of the sound, the demodulated signal being synchronously averaged over a plurality of successive cycles of the heart to produce a clear signature trace of the demodulated sound, even in the presence of background noise.
Inventors
- 👤 J Cage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:08
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
The method of analyzing cardiovascular sound comprising the steps of: detecting the sound signals produced repetitively from a source within the body; detecting a periodic condition in the body synchronous with said repetitively produced sound signals; demodulating said detected sound signals to produce a data signal representative of the average of the amplitude over a selected past period of time; synchronizing the detected sound signals with said periodic condition in the body synchronous with said detected sound signals; averaging a plurality of said demodulated signals over a plurality of successive time periods to obtain an average of the amplitudes of the demodulated signals; and displaying said average of the amplitudes.
Claim 2
Independent Claim
110 words
The method of analyzing cardiovascular sound comprising the steps of: detecting the sound signals produced repetitively from a source within the body; detecting a periodic condition in the body synchronous with said repetitively produced sound signals; demodulating said detected sound signals to produce a data signal representative of the average of the amplitude over a selected past period of time; synchronizing the detected sound signals with said periodic condition in the body synchronous with said detected sound signals; averaging a plurality of said demodulated signals over a plurality of successive time periods to obtain an average of the amplitudes of the demodulated signals; and displaying said average of the amplitudes.
Claim 3
Dependent Claim
29 words
The method as claimed in claim 1 wherein the step of synchronizing the detected sound signals with a periodic condition comprises the steps of synchronizing with an electrocardiographic signal.
Claim 4
Dependent Claim
27 words
The method as claimed in claim 1 wherein the step of detecting the sound signals comprises selecting a band pass above 200 Hz and below 20,000 Hz.
Claim 5
Dependent Claim
24 words
The method as claimed in claim 1 wherein the step of averaging a plurality of sound signals comprises averaging over at least 26 signals.
Claim 6
Dependent Claim
114 words
Apparatus for analyzing cardiovascular sound comprising: means for detecting the sound signals produced repetitively from a source within the body; said periodic condition in the body synchronous with said detected sound signals; means for demodulating said detected sound signals to produce a data signal representative of the average of the amplitude over a selected past period of time; Means for synchronizing said detected sound signals with said periodic condition in the body synchronous with said detected sound signals; means for averaging a plurality of said demodulated signals over a plurality of successive time periods to obtain an average of the amplitudes of the demodulated signals; and means for displaying said average of the amplitudes.
Claim 7
Dependent Claim
114 words
Apparatus for analyzing cardiovascular sound comprising: means for detecting the sound signals produced repetitively from a source within the body; said periodic condition in the body synchronous with said detected sound signals; means for demodulating said detected sound signals to produce a data signal representative of the average of the amplitude over a selected past period of time; Means for synchronizing said detected sound signals with said periodic condition in the body synchronous with said detected sound signals; means for averaging a plurality of said demodulated signals over a plurality of successive time periods to obtain an average of the amplitudes of the demodulated signals; and means for displaying said average of the amplitudes.
Claim 8
Dependent Claim
16 words
Apparatus as claimed in claim 5 wherein said means for averaging comprises a time averaging computer.
Claim 9
Dependent Claim
20 words
Apparatus as claimed in claim 5 wherein said synchronizing means comprises means responsive to the electrocardiographic signal of said body.
Claim 10
Dependent Claim
21 words
Apparatus as claimed in claim 5 wherein said means for detecTing said sound signals comprises a microphone positioned near said body.
Claim 11
Dependent Claim
27 words
Apparatus as claimed in claim 5 including means for filtering said detected sound signals to pass signals in selected bands above 200 Hz and below 20,000 Hz.
References Cited (Backward Citations)
US3087487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |