US3552381A
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Sphygmomanometric method and apparatus
Assignee: AT&T Inc
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Filing: 1967-05-23
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Granted: 1971-01-05
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Expires: 1987-05-23
Abstract
Abstract Diastolic blood pressure measurement by arterial auscultation is afforded by arresting flow as with a pressure cuff and then applying increasingly negative pressure probes to the cuff generally coincident with each phono- or electrocardiographically ascertained minimum of the heart''s pressure cycle, maintaining the negative wave amplitude always in excess of the pulse pressure. Cuff pressure at the onset of Korotkow sound signifies diastolic pressure level. Apparatus is described for unattended, automatic and continuous blood pressure monitoring using this method for diastolic readings. Cuff pressure in one embodiment is held constant as increasingly large negative pressure excursions are applied; in another embodiment cuff pressure is decreased while the negative pressure excursions are held constant in amplitude.
Inventors
- 👤 Gordon K Burns
- 👤 Jeofry S Courtney-Pratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:29
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/022; A61B5/02208; A61B5/0002; A61B5/0225; A61B5/026
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
70 words
A method for determining diastolic blood pressure comprising the steps of: arresting arterial flow with applied pressure; coincident with the occurrences of pulse pressure minima, momentarily relieving the applied pressure by increasing amounts until the relieved applied pressure and the pulse pressure minima overlap sufficiently to permit spurts of arterial flow; and concurrently with the onset of such spurts, measuring the relieved applied pressure as representing the desired diastolic pressure.
Claim 2
Independent Claim
70 words
A method for determining diastolic blood pressure comprising the steps of: arresting arterial flow with applied pressure; coincident with the occurrences of pulse pressure minima, momentarily relieving the applied pressure by increasing amounts until the relieved applied pressure and the pulse pressure minima overlap sufficiently to permit spurts of arterial flow; and concurrently with the onset of such spurts, measuring the relieved applied pressure as representing the desired diastolic pressure.
Claim 3
Independent Claim
51 words
A method for determining diastolic blood pressure comprising the steps of: arresting flow in a selected artery; upon the occurrence of arterial pulse wave minima points only, progressively reducing the extent of arrest until the recommencement of arterial flow; and reading the arterial pressure concurrently with the onset of said flow.
Claim 4
Independent Claim
51 words
A method for determining diastolic blood pressure comprising the steps of: arresting flow in a selected artery; upon the occurrence of arterial pulse wave minima points only, progressively reducing the extent of arrest until the recommencement of arterial flow; and reading the arterial pressure concurrently with the onset of said flow.
Claim 5
Independent Claim
79 words
A method for determining diastolic blood pressure comprising the steps of: subjecting a selected arterial point to an applied initial pressure above systolic; subjecting said arterial point further to an increasingly negative-going pressure pulse applied only at minima of the arterial pulse wave, said negative pulse having an amplitude in excess of the arterial pulse amplitude; and registering the onset of arterial flow following conjunction of an arterial pulse pressure minimum with the peak of a negative-going pressure pulse.
Claim 6
Independent Claim
79 words
A method for determining diastolic blood pressure comprising the steps of: subjecting a selected arterial point to an applied initial pressure above systolic; subjecting said arterial point further to an increasingly negative-going pressure pulse applied only at minima of the arterial pulse wave, said negative pulse having an amplitude in excess of the arterial pulse amplitude; and registering the onset of arterial flow following conjunction of an arterial pulse pressure minimum with the peak of a negative-going pressure pulse.
Claim 7
Independent Claim
104 words
A method for the measurement of blood pressure comprising the steps of: applying an initial pressure in excess of systolic to a selected artery through an inflatable cuff; applying to said artery through said cuff a series of narrow negative-going pressure pulses each centered in time at one of a plurality of successive minimum points of the arterial pulse wave; causing the peaks of said negative-going pulses to approach and then intercept successive minimum points by varying the applied cuFf pressure; detecting the onset of arterial spurts following said interception; and, concurrently, reading the instantaneous cuff pressure as representing a measure of diastolic pressure.
Claim 8
Independent Claim
104 words
A method for the measurement of blood pressure comprising the steps of: applying an initial pressure in excess of systolic to a selected artery through an inflatable cuff; applying to said artery through said cuff a series of narrow negative-going pressure pulses each centered in time at one of a plurality of successive minimum points of the arterial pulse wave; causing the peaks of said negative-going pulses to approach and then intercept successive minimum points by varying the applied cuFf pressure; detecting the onset of arterial spurts following said interception; and, concurrently, reading the instantaneous cuff pressure as representing a measure of diastolic pressure.
Claim 9
Dependent Claim
28 words
A method in accordance with claim 4 wherein said negative-going pressure pulses are substantially constant in amplitude, and wherein the cuff pressure is varied by bleeding the cuff.
Claim 10
Dependent Claim
34 words
A method in accordance with claim 4 wherein said cuff pressure variation is effected by progressively increasing the amplitude of said negative-going pressure pulses while otherwise maintaining said cuff pressure in excess of systolic.
Claim 11
Dependent Claim
157 words
Apparatus for measuring blood pressure comprising: a pressure member for the application of controlled constricting force to an artery; a pressure monitor for registering the pressure applied by said member to said artery; means for registering the occurrence of successive minima points of the arterial pulse pressure wave; means for applying to said member an initial pressure in excess of systolic to fully constrict said artery; means for further applying to said member a succession of narrow, increasingly negative-going pressure pulses, each centered in time at successive ones of said arterial pulse wave minimum points, in response to said registration thereof; means for detecting the onset of arterial flow following the abrupt momentary penetration of one of said negative-going pulses through a minimum point of said arterial pulse wave; and means responsive to said arterial flow onset detection for recording the instantaneous pressure registered by said pressure monitor, said recording being a measure of the diastolic pressure.
Claim 12
Dependent Claim
157 words
Apparatus for measuring blood pressure comprising: a pressure member for the application of controlled constricting force to an artery; a pressure monitor for registering the pressure applied by said member to said artery; means for registering the occurrence of successive minima points of the arterial pulse pressure wave; means for applying to said member an initial pressure in excess of systolic to fully constrict said artery; means for further applying to said member a succession of narrow, increasingly negative-going pressure pulses, each centered in time at successive ones of said arterial pulse wave minimum points, in response to said registration thereof; means for detecting the onset of arterial flow following the abrupt momentary penetration of one of said negative-going pulses through a minimum point of said arterial pulse wave; and means responsive to said arterial flow onset detection for recording the instantaneous pressure registered by said pressure monitor, said recording being a measure of the diastolic pressure.
Claim 13
Dependent Claim
98 words
Apparatus for determining diastolic blood pressure comprising: first means for applying pressure to a selected artery sufficient to arrest flow; second means for registering the occurence of minimum points of the arterial pulse pressure wave; third means responsive to each successive said registration for reducing the pressure applied by said first means, said reduction being in increasingly greater amounts causing said arresting pressure to approach, and finally to equal, the value of said diastolic pressure as indicated by the onset of arterial spurts; and fourth means for indicating the arterial pressure concurrently with the onset of said spurts.
Claim 14
Dependent Claim
98 words
Apparatus for determining diastolic blood pressure comprising: first means for applying pressure to a selected artery sufficient to arrest flow; second means for registering the occurence of minimum points of the arterial pulse pressure wave; third means responsive to each successive said registration for reducing the pressure applied by said first means, said reduction being in increasingly greater amounts causing said arresting pressure to approach, and finally to equal, the value of said diastolic pressure as indicated by the onset of arterial spurts; and fourth means for indicating the arterial pressure concurrently with the onset of said spurts.
Claim 15
Dependent Claim
59 words
Apparatus in accordance with claim 8 wherein said second means comprises: means for monitoring the cardiac cycle events and for deriving therefrom a recurrent timing pulse in rhythm with the arterial pulse; means for synchronizing the occurrence of said timing pulses with successive minima of the arterial pulse; and means for transmitting said timing pulses to said third means.
Claim 16
Dependent Claim
26 words
Apparatus in accordance with claim 9 wherein said first means comprises an inflatable arm cuff and wherein said fourth means comprises a pressure-indicating device connected thereto.
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |