US4768518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure control system and apparatus for the cuff of an automatic non-invasive blood pressure meter
Assignee: Instrumentarium Oyj
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Filing: 1986-09-23
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Granted: 1988-09-06
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Expires: 2006-09-23
Abstract
Abstract The invention relates to a pressure control system and apparatus for the cuff of an automatic blood pressure meter. Pressure reduction is adapted to be effected by using at least two constrictions (3) having a constant constriction, the selection and combination of such constrictions being performed by digitally controlled magnetic valves (4). Such magnetic valves are controlled by a microprocessor (6) depending on a measuring value provided by a sensor (7) for measuring the cuff pressure transition rate so as to obtain a desired, approximately linear rate of pressure reduction. The constrictors (3) comprise thin flexible tubes. The system is capable of compensating automatically for the changes caused in the desired volume air flow by the cuff size and tightness, variations in the circumference of a person's arm, the heartbeat density and pressure range.
Inventors
- 👤 Pentti Peltonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:43
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/20; G05D16/2006; G05D16/2013; G05D16/2026; G05D16/204; A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/02141; A61B5/022; A61B5/02233; A61B5/0235; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7847
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
183 words
A pressure control system for reducing the pressure in a fluid pressurizable cuff of an automatic sphygmomanometer at a substantially constant rate, said system comprising: a pressure reduction line (2) coupled to the cuff (1); at least a pair of constriction elements (3) coupled to said pressure reduction line and forming constricting paths for discharging fluid from the cuff to reduce the pressure therein, each of said elements possessing a constant magnitude fluid flow constriction property; an on-off valve means (4) operatively associated with each of said constriction elements, said valve means closing each of said constriction elements and opening each of said constriction elements to provide the constricted discharge path; means (7) for sensing the pressure in the cuff; and control means (6) coupled to said pressure sensing means and to said valve means, said control means sequentially operating individual valve means or combinations thereof responsive to the pressure sensed in the cuff by said pressure sensing means to obtain a fluid discharge through said constriction elements providing a pressure reduction in the cuff that is approximately linear with respect to time.
Claim 2
Dependent Claim
183 words
A pressure control system for reducing the pressure in a fluid pressurizable cuff of an automatic sphygmomanometer at a substantially constant rate, said system comprising: a pressure reduction line (2) coupled to the cuff (1); at least a pair of constriction elements (3) coupled to said pressure reduction line and forming constricting paths for discharging fluid from the cuff to reduce the pressure therein, each of said elements possessing a constant magnitude fluid flow constriction property; an on-off valve means (4) operatively associated with each of said constriction elements, said valve means closing each of said constriction elements and opening each of said constriction elements to provide the constricted discharge path; means (7) for sensing the pressure in the cuff; and control means (6) coupled to said pressure sensing means and to said valve means, said control means sequentially operating individual valve means or combinations thereof responsive to the pressure sensed in the cuff by said pressure sensing means to obtain a fluid discharge through said constriction elements providing a pressure reduction in the cuff that is approximately linear with respect to time.
Claim 3
Dependent Claim
16 words
The pressure control system according to claim 1 wherein said constriction elements comprise thin, flexible tubes.
Claim 4
Dependent Claim
24 words
The pressure control system according to claim 2 wherein said tubes present differing constant magnitude fluid flow constriction properties with respect to each other.
Claim 5
Dependent Claim
17 words
The pressure control system according to claim 3 wherein the constriction element tubes are of differing lengths.
Claim 6
Dependent Claim
25 words
The pressure control system according to claim 1 wherein said constriction elements present differing, constant magnitude fluid flow constriction properties with respect to each other.
Claim 7
Dependent Claim
18 words
The pressure control system according to claim 1 including three constriction elements coupled to said pressure reduction line.
Claim 8
Dependent Claim
15 words
The pressure control system according to claim 1 wherein said valve means comprise magnetic valves.
Claim 9
Dependent Claim
15 words
The pressure control system according to claim 1 wherein said control means comprises a microprocessor.
Claim 10
Dependent Claim
27 words
The pressure control system according to claim 1 wherein said control means comprises a digital microprocessor means and wherein said valve means comprise digitally controlled magnetic valves.
Claim 11
Dependent Claim
31 words
The pressure control system according to claim 1 wherein said control means is further defined as operating said valve means reponsive to the occurrence of preselected pressure levels in the cuff.
Claim 12
Dependent Claim
28 words
The pressure control system according to claim 10 wherein said control means is further defined as being adjustable to operate said valve means at different preselected pressure levels.
Claim 13
Dependent Claim
20 words
The pressure control system according to claim 1 including a pressure dump valve (5) coupled to said pressure reduction line.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |