US4231366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blood flow monitoring and control apparatus
Assignee: Dr Eduard Fresenius Chemisch Pharmazeutische Industrie KG Apparatebau KG
•
Filing: 1977-08-08
•
Granted: 1980-11-04
•
Expires: 1997-08-08
Abstract
Abstract The present blood flow monitoring and control apparatus is especially use in connection with the so-called single needle technique, for example, for treatments such as dialysis, perfusion, or diafiltration. The blood pressure control is accomplished by a measuring chamber including a pressure equalizing device operatively connected between the blood cleaning apparatus and the blood pump. Sensors are operatively connected to the volume measuring chamber. The volume sensors provide electric control input signals to a control circuit which in turn controls the blood pumps and/or valves. A reading may be provided on a display or an alarm may be given when the blood pressure or blood quantity or volume is not within predetermined limits as calculated by an electronic computer.
Inventors
- 👤 Wilfried Schael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:27
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/14; A61M1/30; A61M1/301; A61M1/303; A61M1/305; A61M1/308; A61M1/36; A61M1/3621; A61M1/3624; A61M2205/00; A61M2205/33; A61M2205/3379; A61M2205/3382; A61M2205/3386; A61M2209/00; A61M2209/08; A61M2209/082; Y; Y10; Y10S; Y10S128/00; Y10S128/13
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
307 words
A blood flow monitoring and control apparatus, comprising single needle liquid withdrawal and liquid return means (1) connectable to a patient, blood treating means (4), first artery conduit means (3') connecting said blood treating means to said single needle means, artery pump means (3) in said first artery conduit means, a single operating condition volume sensing means (5) having an inlet and an outlet, second artery conduit means operatively interconnecting said blood treating means (4) to said inlet of said single operating condition volume sensing means (5), vein conduit means (11') and vein pump means (11) in said vein conduit means operatively connecting said outlet of said single operating condition volume sensing means (5) to said single needle means to form together with said first conduit means a closed loop flow circuit in which the blood circulates in but one direction, and control means (13) operatively connected to said single operating condition volume sensing means (5) as well as to said artery and vein pump means (3, 11) to control the blood flow in said closed loop flow circuit, said operating condition volume sensing means comprising filling level sensing means 7, 8, 9, 10 for the volumetric measuring of the liquid flowing in said one direction in said closed loop flow circuit, said filling level sensing means providing control signals for a liquid withdrawal phase from said volume sensing means (5) through said vein conduit and vein pump means (11, 11') and for a liquid return phase to said volume sensing means (5) through said artery conduit and artery pump means (3, 3'), whereby the liquid withdrawal phase is stopped upon reaching a predetermined first filling level in said volume sensing means (5) and the liquid return phase is started whereas a liquid return phase is stopped upon reaching a predetermined second filling level and vice versa.
Claim 2
Dependent Claim
307 words
A blood flow monitoring and control apparatus, comprising single needle liquid withdrawal and liquid return means (1) connectable to a patient, blood treating means (4), first artery conduit means (3') connecting said blood treating means to said single needle means, artery pump means (3) in said first artery conduit means, a single operating condition volume sensing means (5) having an inlet and an outlet, second artery conduit means operatively interconnecting said blood treating means (4) to said inlet of said single operating condition volume sensing means (5), vein conduit means (11') and vein pump means (11) in said vein conduit means operatively connecting said outlet of said single operating condition volume sensing means (5) to said single needle means to form together with said first conduit means a closed loop flow circuit in which the blood circulates in but one direction, and control means (13) operatively connected to said single operating condition volume sensing means (5) as well as to said artery and vein pump means (3, 11) to control the blood flow in said closed loop flow circuit, said operating condition volume sensing means comprising filling level sensing means 7, 8, 9, 10 for the volumetric measuring of the liquid flowing in said one direction in said closed loop flow circuit, said filling level sensing means providing control signals for a liquid withdrawal phase from said volume sensing means (5) through said vein conduit and vein pump means (11, 11') and for a liquid return phase to said volume sensing means (5) through said artery conduit and artery pump means (3, 3'), whereby the liquid withdrawal phase is stopped upon reaching a predetermined first filling level in said volume sensing means (5) and the liquid return phase is started whereas a liquid return phase is stopped upon reaching a predetermined second filling level and vice versa.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1, further comprising pressure equalization means operatively connected to said volume level sensing means.
Claim 4
Dependent Claim
27 words
The apparatus of claim 1, wherein said filling level sensing means comprise a plurality of individual sensors and means for adjusting the elevational position of said sensors.
Claim 5
Dependent Claim
145 words
The apparatus of claim 1, wherein said filling level sensing means comprise measuring chamber means and a plurality of individual sensors, a first pair of said sensors being arranged for sensing the upper and lower limit of a normal filling level condition in said measuring chamber for limiting the normal filling level condition to be within said upper and lower limit, a second pair of said sensors being arranged to detect the exceeding of said upper limit and the dropping below said lower limit respectively of the filling level condition in said measuring chamber, said first pair of sensors (8, 9) being operatively connected to said control means for controlling said pump means so as to maintain the normal filling level condition in said measuring chamber means, said second pair of sensors (7, 10) being connected to said control means for stopping said pump means.
Claim 6
Dependent Claim
24 words
The apparatus of claim 4, further comprising means operatively connected to said control means for indicating the filling condition in said measuring chamber means.
Claim 7
Dependent Claim
14 words
The apparatus of claim 5, wherein said indicating means indicate an unpermissible operating condition.
Claim 8
Dependent Claim
27 words
The apparatus of claim 1, further comprising valve means in said first and second conduit means, and means operatively connecting said valve means to said control means.
Claim 9
Dependent Claim
90 words
The apparatus of claim 7, wherein said single needle liquid withdrawal and liquid return means comprise an inlet port proper, a conduit connected for liquid withdrawal and a conduit connected for liquid return, both conduits being connected to said inlet port proper, said control means being arranged to control said pump means and said valve means so that the flow rate is higher in said liquid withdrawal conduit during a liquid withdrawal phase while it is lower in said liquid return conduit and vice versa during the liquid return phase.
Claim 10
Dependent Claim
49 words
The apparatus of claim 1, wherein said control means further comprise electronic computer means operatively connected to said control means, and indicating means operatively connected to said computer means which calculate a blood flow mean value for each operational cycle, said indicating means displaying said blood flow mean value.
Claim 11
Dependent Claim
29 words
The apparatus of claim 9, wherein said control means further comprise monitoring circuit means which recognize the deviations from a preselected blood flow mean value to provide a warning.
Claim 12
Dependent Claim
22 words
The apparatus of claim 10, wherein said monitoring circuit means also recognize the stopping of the blood flow to provide a warning.
Claim 13
Dependent Claim
29 words
The apparatus of claim 1, wherein said control means further comprise flow quantity measuring means including counter means for indicating the total volume of blood flowing through the apparatus.
References Cited (Backward Citations)
US2625933A
Cited
US3609379A
Cited
US3659603A
Cited
US3701345A
Cited
US3946731A
Cited
US3830234A
Cited
US3756234A
Cited
US3802432A
Cited
US3838682A
Cited
FR2220281A1
Cited
US3896803A
Cited
US3882861A
Cited
US3890969A
Cited
US3908653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |