US4127111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic blood sampling system and method
Assignee: Free World Trust
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Filing: 1976-10-26
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Granted: 1978-11-28
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Expires: 1996-10-26
Abstract
Abstract An automatic blood sampling system and method which are characterized by preventing the transmission of electric shocks to the patient, by the use of only very small blood samples, by evacuating the used blood samples to waste and thus permitting the conduct of destructive tests on the samples, and by automatic and safe cleaning and rinsing of the tubing. This system distinctively defines a pair of mini-bypasses for the blood of a patient to produce blood circulation by-passing the blood stream of the patient and to withdraw the blood samples from the mini-bypasses, upon command from an automatic blood analyser and actuation by a logic circuit. The latter actuates the necessary electromagnetic valves by a binary coding corresponding to the "on" and "off" states respectively and to produce BLOOD SAMPLING, STANDBY, WASTE, WASH and FEED SAMPLE states of actuation of the valves in response to changes in the states of operation of the automatic blood analyser.
Inventors
- 👤 Roland A. Drolet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:50
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/15; A61B5/150007; A61B5/150015; A61B5/15003; A61B5/150206; A61B5/150229; A61B5/150992; A61B5/155; A61B5/157; G; G01; G01N; G01N35/00; G01N35/10; G01N35/1095; G01N35/1097
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
235 words
A system for automatic sampling of blood and for the automatic feeding of a measured volume of blood to an automatic blood analyser, comprising a tubing having means at both ends for communicating said tubing with two spaced points of a blood vessel of a patient to establish a partial bypass, a power-operated pump means to continuously circulate blood at a constant rate of flow through said tubing by extracting blood from and returning it to said blood vessel, a blood sample withdrawal tubing adapted to be connected at one end to said analyzer, a compressed fluid source connected to the other end of said withdrawal tubing, a branch line tubing interconnecting intermediate points of said partial bypass tubing and of said withdrawal tubing, a first electromagnetic valve in said branch line tubing, a second electromagnetic valve in said withdrawal tubing serially mounted intermediate said fluid source and said branch line, and an electric command circuit means electrically connected to said two valves and giving timed commands to said valves causing opening of said first valve for a predetermined time to allow discharge of a predetermined volume of blood through said branch line within said withdrawal tubing, while said second valve is closed, then causing closing of said first valve and subsequent opening of said second valve, whereby said fluid under pressure pushes into said analyzer the measured quantity of blood in said withdrawal tubing.
Claim 2
Independent Claim
235 words
A system for automatic sampling of blood and for the automatic feeding of a measured volume of blood to an automatic blood analyser, comprising a tubing having means at both ends for communicating said tubing with two spaced points of a blood vessel of a patient to establish a partial bypass, a power-operated pump means to continuously circulate blood at a constant rate of flow through said tubing by extracting blood from and returning it to said blood vessel, a blood sample withdrawal tubing adapted to be connected at one end to said analyzer, a compressed fluid source connected to the other end of said withdrawal tubing, a branch line tubing interconnecting intermediate points of said partial bypass tubing and of said withdrawal tubing, a first electromagnetic valve in said branch line tubing, a second electromagnetic valve in said withdrawal tubing serially mounted intermediate said fluid source and said branch line, and an electric command circuit means electrically connected to said two valves and giving timed commands to said valves causing opening of said first valve for a predetermined time to allow discharge of a predetermined volume of blood through said branch line within said withdrawal tubing, while said second valve is closed, then causing closing of said first valve and subsequent opening of said second valve, whereby said fluid under pressure pushes into said analyzer the measured quantity of blood in said withdrawal tubing.
Claim 3
Dependent Claim
127 words
A system as claimed in claim 1, further including a second branch line opening to waste and connected to said withdrawal tubing intermediate said first branch line and said other end of said withdrawal tubing, and a third electromagnetic valve in said second branch line, said electric command circuit means also electrically connected to said third valve and giving timed command to said third valve to cause the same to be in closed position when either one of said first and second valves are open and to cause opening of said third valve when both said first and second valves are closed, to thus allow the analyzer to clean the withdrawal tubing and to evacuate the content of the same through said second branch line to waste.
References Cited (Backward Citations)
US2455810A
Cited
US3756234A
Cited
US3838682A
Cited
US3910256A
Cited
US3908653A
Cited
US3995623A
Cited
US4030888A
Cited
US4014328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-27 | 1982-05-29 | 1982-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-27 | 1986-05-29 | 1986-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-27 | 1990-05-29 | 1990-11-28 | $7700.00 | Window Closed / Lapsed |