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US3744490A
Expired / Lapsed
US
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Automatic device for recording blood pressure
Assignee: Individual
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Filing: 1971-11-16
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Granted: 1973-07-10
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Expires: 1991-11-16
Abstract
Abstract An apparatus for producing a record of systolic and diastolic blood pressure for one or more individuals whereby an inflatable blood pressure cuff is conventionally placed on a part of the body such that inflation of the cuff constricts blood flow and causes the Korotkoff sounds to appear at roughly the diastolic pressure and disappear at roughly the systolic pressure and inflated under the control of an electrical impedance detector which, for example, may be placed on one or two digits and which detects the pulsating impedance which continues until a pressure is reached which is beyond the systolic pressure and at this pressure the cuff is automatically deflated. A transducer such as a microphone is placed, for example, under the cuff to detect the Korotkoff sounds and produce a pulse train as long as these sounds are detected. This Korotkoff signal is recorded on a conventional graphic recorder together with a signal generated, for example, by a strain gauge which indicates the cuff pressure such that the systolic and diastolic pressures both during inflation and deflation can be ascertained from the beginning and end of the pulse train superimposed on the recorded cuff pressure signal. This device can be used with one cuff transducer or simultaneously with a plurality of cuffs and transducers to simultaneously produce on different channels of a graphic recorder a record of the systolic and diastolic blood pressures of a number of different individuals.
Inventors
- 👤 H Fernandez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:27
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/022; A61B5/02208; A61B5/026; A61B5/0295
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
364 words
Apparatus for producing a record of systolic and diastolic blood pressure comprising: an inflatable blood pressure cuff adapted for placement on a part of the body so that inflation of said cuff constricts blood flow through that part and causes the Korotkoff sounds to appear at roughly the diastolic pressure and disappear at roughly the systolic pressure and valve means for connecting said cuff to a source of air pressure, to inflate said cuff and for deflating said cuff, valve control means for causing said valve means to permit air to flow into and inflate said cuff until a pressure in excess of systolic pressure is reached and then to deflate said cuff, including means for detecting the electrical impedance between two body locations adjacent said cuff placement including first and second electrodes, means for generating a signal on said electrodes, a pulse generating circuit connected to said electrodes for producing an electrical pulse train while said impedance is pulsating, means for receiving and integrating said pulse train, control circuit means connected to said valve control means for receiving said integrated signal and producing a signal for causing said valve means to inflate said cuff when said integrated signal exceeds a given valve for causing said valve means to deflate said cuff when said integrated signal is less than a given valve, timer means periodically operable to inflation of said cuff and gate means connected to said timer means and connecting said pulse train producing means to said integrating means for passing said pulse train to said receiving and integrating means while said timer is operable, means for producing a first signal while said cuff is inflating and said impedance is pulsating and a second signal wheN said impedance substantially stops pulsating, means responsive to said first signal to cause inflation and means responsive to said second signal to cause deflation, transducer means, adapted for placement to detect the Korotkoff sounds, for producing a Korotkoff signal indicating whether the Korotkoff sounds are being producted, means for sensing cuff pressure, and means connected to said sensing means and to said transducer means for recording cuff pressures and said Korotkoff signal during both inflation and deflation.
Claim 2
Dependent Claim
364 words
Apparatus for producing a record of systolic and diastolic blood pressure comprising: an inflatable blood pressure cuff adapted for placement on a part of the body so that inflation of said cuff constricts blood flow through that part and causes the Korotkoff sounds to appear at roughly the diastolic pressure and disappear at roughly the systolic pressure and valve means for connecting said cuff to a source of air pressure, to inflate said cuff and for deflating said cuff, valve control means for causing said valve means to permit air to flow into and inflate said cuff until a pressure in excess of systolic pressure is reached and then to deflate said cuff, including means for detecting the electrical impedance between two body locations adjacent said cuff placement including first and second electrodes, means for generating a signal on said electrodes, a pulse generating circuit connected to said electrodes for producing an electrical pulse train while said impedance is pulsating, means for receiving and integrating said pulse train, control circuit means connected to said valve control means for receiving said integrated signal and producing a signal for causing said valve means to inflate said cuff when said integrated signal exceeds a given valve for causing said valve means to deflate said cuff when said integrated signal is less than a given valve, timer means periodically operable to inflation of said cuff and gate means connected to said timer means and connecting said pulse train producing means to said integrating means for passing said pulse train to said receiving and integrating means while said timer is operable, means for producing a first signal while said cuff is inflating and said impedance is pulsating and a second signal wheN said impedance substantially stops pulsating, means responsive to said first signal to cause inflation and means responsive to said second signal to cause deflation, transducer means, adapted for placement to detect the Korotkoff sounds, for producing a Korotkoff signal indicating whether the Korotkoff sounds are being producted, means for sensing cuff pressure, and means connected to said sensing means and to said transducer means for recording cuff pressures and said Korotkoff signal during both inflation and deflation.
Claim 3
Dependent Claim
44 words
Apparatus as in claim 1 wherein said transducer means includes means for producing an electrical pulse train while said Korotkoff sounds are being produced so that the beginning of said pulse train indicates diastolic pressure and the end of said pulse train systolic pressure.
Claim 4
Dependent Claim
16 words
Apparatus as in claim 2 wherein said recording means includes means for producing a graphical record.
Claim 5
Dependent Claim
40 words
Apparatus as in claim 1 including timer means for initiating inflation of said cuff and for causing reinflation after deflation so as to produce at least four diastolic and systolic blood pressure readings, two during inflation and two during deflation.
Claim 6
Dependent Claim
44 words
Apparation as in claim 1 wherein said cuff pressure sensing means includes a strain gauge connected to said cuff for producing an electrical signal indicating the pressure of said cuff and wherein said recording means includes means for receiving and recording said pressure signal.
Claim 7
Dependent Claim
131 words
Apparatus as in claim 1 further including a second inflatable blood pressure cuff adapted for placement on a part of a second body so that inflation of said second cuff constricts blood flow through that part and causes the Korotkoff sounds to appear at roughly the diastolic pressure and disappear at roughly the systolic pressure, means connecting said second cuff to said valve means so that said second cuff inflates and deflates with said first cuff, and second transducer means adapted for placement on said second body to detect the Korotkoff sounds of said body and for producing a second body Korotkoff signal indicating whether the Korotkoff sounds are being produced and wherein said recording means includes means for also recording said second body Korotkoff signal and said second cuff pressure.
Claim 8
Dependent Claim
298 words
Apparatus for producing a record of systolic and diastolic blood pressure comprising: an inflatable blood pressure cuff adapted for placement on a part of the body so that inflation of said cuff constricts blood flow through that part and causes the Korotkoff sounds to appear at roughly the diastolic pressure and disappear at roughly the systolic pressure and valve means for connecting said cuff to a source of air pressure, to inflate said cuff and for deflating said cuff, valve control means for causing said valve means to permit air to flow into and inflate said cuff until a pressure in excess of systolic pressure is reached and then to deflate said cuff, including means for detecting the electrical impedance between two body locations adjacent said cuff placement, means for producing a first signal while said cuff is inflating and said impedance is pulsating and a second signal when said impedance substantially stops pulsating, means responsive to said first signal to cause inflation and means responsive to said second signal to cause deflation, transducer means, adapted for placement to detect the Korotkoff sounds, for producing a Korotkoff signal indicating whether the Korotkoff sounds are being produced including a microphone, means connected to said microphone for producing an electrical pulse train while said Korotkoff sounds are being produced, a D.C. amplifier connected to said strain gauge means for receiving said signal indicating cuff pressure, and a capacitor connecting said pulse train producing means to said D.C. amplifier, strain gauge means connected to said cuff for producing an electrical signal indicating cuff pressure, and means connected to said strain gauge and to said transducer means for recording cuff pressures and said Korotkoff signal during both inflation and deflation including a graphic recorder connected to the output of said D.C. amplifier.
Claim 9
Dependent Claim
298 words
Apparatus for producing a record of systolic and diastolic blood pressure comprising: an inflatable blood pressure cuff adapted for placement on a part of the body so that inflation of said cuff constricts blood flow through that part and causes the Korotkoff sounds to appear at roughly the diastolic pressure and disappear at roughly the systolic pressure and valve means for connecting said cuff to a source of air pressure, to inflate said cuff and for deflating said cuff, valve control means for causing said valve means to permit air to flow into and inflate said cuff until a pressure in excess of systolic pressure is reached and then to deflate said cuff, including means for detecting the electrical impedance between two body locations adjacent said cuff placement, means for producing a first signal while said cuff is inflating and said impedance is pulsating and a second signal when said impedance substantially stops pulsating, means responsive to said first signal to cause inflation and means responsive to said second signal to cause deflation, transducer means, adapted for placement to detect the Korotkoff sounds, for producing a Korotkoff signal indicating whether the Korotkoff sounds are being produced including a microphone, means connected to said microphone for producing an electrical pulse train while said Korotkoff sounds are being produced, a D.C. amplifier connected to said strain gauge means for receiving said signal indicating cuff pressure, and a capacitor connecting said pulse train producing means to said D.C. amplifier, strain gauge means connected to said cuff for producing an electrical signal indicating cuff pressure, and means connected to said strain gauge and to said transducer means for recording cuff pressures and said Korotkoff signal during both inflation and deflation including a graphic recorder connected to the output of said D.C. amplifier.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |