US4926873A
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Method for measuring blood pressure and apparatus for automated blood pressure measuring
Assignee: Koninklijke Philips NV
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Filing: 1989-03-20
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Granted: 1990-05-22
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Expires: 2009-03-20
Abstract
Abstract A method of non-invasive blood measuring is conducted according to the oscillometric method. The size of the decremental steps Δp def of a certain measuring cycle C 1+1 is a function of subject's actual blood pressure of the preceding measuring cycle c i .
Inventors
- 👤 Michael Frankenreiter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:33
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/022; A61B5/02225; A61B5/02108; A61B5/02116
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
237 words
A method for measuring blood pressure of a subject, the method comprising the steps of: (a) applying a blood pressure cuff about a subject's limb that contains an artery; (b) inflating the cuff to a pressure p max above the systolic pressure p sys of the subject, thereby occluding flow in the artery; (c) reducing cuff pressure from p max to a pressure p min below the diastolic pressure p dia of the subject in a sequence of cuff pressure abrupt decrements Δp def of approximately equal magnitude in a sequence of time intervals, where the pressure decrement for each time interval in cycle i+1 (i≧1) is determined by dividing the difference of two pressure values p 2ci and p 1ci by a positive constant that is independent of subject and that is no greater than six, where p 1ci and p 2ci are pressure values determined in cycle i that satisfy the relations p min ≦p 1ci <p 2ci ≦p max , thereby permitting sequentially increasing flow of blood through the artery; (d) determining the artery pressure within each time interval for which cuff pressure is approximately constant and determining p sys , p dia and the mean arterial pressure for the cycle i+1; (e) displaying the blood pressure values p sys and p dia for the subject for the cycle i+1; and (f) repeating the preceding method steps (b), (c) and (d) at least once.
Claim 2
Independent Claim
237 words
A method for measuring blood pressure of a subject, the method comprising the steps of: (a) applying a blood pressure cuff about a subject's limb that contains an artery; (b) inflating the cuff to a pressure p max above the systolic pressure p sys of the subject, thereby occluding flow in the artery; (c) reducing cuff pressure from p max to a pressure p min below the diastolic pressure p dia of the subject in a sequence of cuff pressure abrupt decrements Δp def of approximately equal magnitude in a sequence of time intervals, where the pressure decrement for each time interval in cycle i+1 (i≧1) is determined by dividing the difference of two pressure values p 2ci and p 1ci by a positive constant that is independent of subject and that is no greater than six, where p 1ci and p 2ci are pressure values determined in cycle i that satisfy the relations p min ≦p 1ci <p 2ci ≦p max , thereby permitting sequentially increasing flow of blood through the artery; (d) determining the artery pressure within each time interval for which cuff pressure is approximately constant and determining p sys , p dia and the mean arterial pressure for the cycle i+1; (e) displaying the blood pressure values p sys and p dia for the subject for the cycle i+1; and (f) repeating the preceding method steps (b), (c) and (d) at least once.
Claim 3
Dependent Claim
37 words
The method of claim 1, further comprising the steps of: choosing p 2ci as p sys ci =systolic pressure determined in cycle i, and choosing p 1ci as p dia ci =diastolic pressure determined in cycle i.
Claim 4
Dependent Claim
44 words
The method of claim 1, further comprising the steps of: providing previously-determined systolic and diastolic pressure values, denoted p sys ,0 and p dia ,0, for said subject so that, for said first cycle i=1 said pressure decrement Δp def is determined by ##EQU4##
Claim 5
Dependent Claim
227 words
Apparatus for measuring blood pressure of a subject, the apparatus comprising: an inflatable and deflatable pressure cuff that can be applied about a subject's limb containing an artery; pressure means for inflating the cuff to a pressure p max above the systolic pressure p sys of the subject; pressure reduction means for reducing the cuff pressure from P max to a pressure p min below the diastolic pressure p min of the subject in a sequence of cuff pressure abrupt decrements Δp def of approximately equal magnitude in a sequence of time intervals, where the pressure decrement for each time interval in cycle i+1 (i≧1) is determined by dividing the difference of two pressure values p 2ci and p 1ci by a positive constant that is independent of subject and that is no greater than six, where p 1ci and p 2ci are pressure values determined in cycle i that satisfy the relations p min ≦p 1ci <p 2ci ≦p max , thereby permitting sequentially increasing flow of blood through the artery; measurement means for determining the artery pressure within each time interval for which cuff pressure is approximately constant and for determining p sys , p dia and the mean arterial pressure for the cycle i+1; and display means for displaying the blood pressure values p sys and p dia for the subject for cycle i+1.
Claim 6
Dependent Claim
227 words
Apparatus for measuring blood pressure of a subject, the apparatus comprising: an inflatable and deflatable pressure cuff that can be applied about a subject's limb containing an artery; pressure means for inflating the cuff to a pressure p max above the systolic pressure p sys of the subject; pressure reduction means for reducing the cuff pressure from P max to a pressure p min below the diastolic pressure p min of the subject in a sequence of cuff pressure abrupt decrements Δp def of approximately equal magnitude in a sequence of time intervals, where the pressure decrement for each time interval in cycle i+1 (i≧1) is determined by dividing the difference of two pressure values p 2ci and p 1ci by a positive constant that is independent of subject and that is no greater than six, where p 1ci and p 2ci are pressure values determined in cycle i that satisfy the relations p min ≦p 1ci <p 2ci ≦p max , thereby permitting sequentially increasing flow of blood through the artery; measurement means for determining the artery pressure within each time interval for which cuff pressure is approximately constant and for determining p sys , p dia and the mean arterial pressure for the cycle i+1; and display means for displaying the blood pressure values p sys and p dia for the subject for cycle i+1.
Claim 7
Dependent Claim
46 words
The apparatus of claim 4, further comprising data input means for making available previously-determined systolic and diastolic pressure values, denoted p sys ,0 and p dia ,0, for said subject so that, for said first cycle i=1, said pressure decrement Δp def is determined by ##EQU5##
Claim 8
Dependent Claim
29 words
The apparatus of claim 4, further comprising recycle means for causing said apparatus of claim 14 to perform two of said cycles i=1 and i=2 of blood pressure measurement.
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) | 1993-05-21 | 1993-11-20 | 1994-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-21 | 1997-11-20 | 1998-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-21 | 2001-11-20 | 2002-05-22 | $7700.00 | Window Closed / Lapsed |