Patent US3717174A successfully refreshed from Google Patents.
US3717174A
Expired / Lapsed
US
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Perfusion safety valve
Assignee: Individual
•
Filing: 1971-08-03
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Granted: 1973-02-20
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Expires: 1991-08-03
Abstract
Abstract A perfusion safety valve for use in blood oxygenating systems. The valve includes an elongated, rigid, perforated tube and interiorly disposed therein is a collapsible membrane-like wall which may collapse to cut off the flow of blood through the tube. Exteriorly of the tube is a second membrane-like wall and the space between the two membrane walls is filled with a liquid. When a slight vacuum is pulled against the inner membrane wall, the liquid will pass through the perforations of the tube into the interior of the tube to cause collapse of the interior wall to shut off the flow through the valve to preclude the pumping of air into the arterial system of a patient using the oxygenating system.
Inventors
- 👤 R Dewall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:58
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/36; A61M39/00; A61M39/22; A61M39/227; A61M39/228; A61M1/00; A61M1/36; A61M1/3621; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/788; Y10T137/8593; Y10T137/85978; Y10T137/85986; Y10T137/86002; Y10T137/86019
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
259 words
A blood oxygenating system including a perfusion safety valve comprising an elongated, relatively rigid, perforated tube; means at each end of said tube for connecting the same into a conduit in which blood is flowing; a peripheral inner membrane wall formed of a flexible material compatible with blood within said tube; an outer membrane wall outside of said tube; said inner and outer membrane walls defining a closed space; and a liquid within said closed space; whereby when blood is flowing through said tube, said inner membrane wall will be in substantial abutment with the internal surface of said tube while when blood ceases to flow to said tube, a slight vacuum in the blood line will cause the liquid in said closed space to flow through the perforations in said tube to cause said inner membrane wall to collapse upon itself to seal off the blood line, a blood oxygenator adapted to receive blood from a patient for oxygenating the same; means Establishing a blood flow path from said oxygenator to one of said connecting means; a blood pump; means establishing a blood flow path from the other of said connecting means to said blood pump, said blood pump being adapted to conduct oxygenated blood to the patient and further being a positive displacement pump whereby a slight vacuum may be pulled upstream of the same so that the absence of blood flowing from said oxygenator to said valve will result in said valve closing to preclude the pumping of air into the arterial system of the patient.
Claim 2
Dependent Claim
259 words
A blood oxygenating system including a perfusion safety valve comprising an elongated, relatively rigid, perforated tube; means at each end of said tube for connecting the same into a conduit in which blood is flowing; a peripheral inner membrane wall formed of a flexible material compatible with blood within said tube; an outer membrane wall outside of said tube; said inner and outer membrane walls defining a closed space; and a liquid within said closed space; whereby when blood is flowing through said tube, said inner membrane wall will be in substantial abutment with the internal surface of said tube while when blood ceases to flow to said tube, a slight vacuum in the blood line will cause the liquid in said closed space to flow through the perforations in said tube to cause said inner membrane wall to collapse upon itself to seal off the blood line, a blood oxygenator adapted to receive blood from a patient for oxygenating the same; means Establishing a blood flow path from said oxygenator to one of said connecting means; a blood pump; means establishing a blood flow path from the other of said connecting means to said blood pump, said blood pump being adapted to conduct oxygenated blood to the patient and further being a positive displacement pump whereby a slight vacuum may be pulled upstream of the same so that the absence of blood flowing from said oxygenator to said valve will result in said valve closing to preclude the pumping of air into the arterial system of the patient.
Claim 3
Dependent Claim
259 words
A blood oxygenating system including a perfusion safety valve comprising an elongated, relatively rigid, perforated tube; means at each end of said tube for connecting the same into a conduit in which blood is flowing; a peripheral inner membrane wall formed of a flexible material compatible with blood within said tube; an outer membrane wall outside of said tube; said inner and outer membrane walls defining a closed space; and a liquid within said closed space; whereby when blood is flowing through said tube, said inner membrane wall will be in substantial abutment with the internal surface of said tube while when blood ceases to flow to said tube, a slight vacuum in the blood line will cause the liquid in said closed space to flow through the perforations in said tube to cause said inner membrane wall to collapse upon itself to seal off the blood line, a blood oxygenator adapted to receive blood from a patient for oxygenating the same; means Establishing a blood flow path from said oxygenator to one of said connecting means; a blood pump; means establishing a blood flow path from the other of said connecting means to said blood pump, said blood pump being adapted to conduct oxygenated blood to the patient and further being a positive displacement pump whereby a slight vacuum may be pulled upstream of the same so that the absence of blood flowing from said oxygenator to said valve will result in said valve closing to preclude the pumping of air into the arterial system of the patient.
Claim 4
Dependent Claim
259 words
A blood oxygenating system including a perfusion safety valve comprising an elongated, relatively rigid, perforated tube; means at each end of said tube for connecting the same into a conduit in which blood is flowing; a peripheral inner membrane wall formed of a flexible material compatible with blood within said tube; an outer membrane wall outside of said tube; said inner and outer membrane walls defining a closed space; and a liquid within said closed space; whereby when blood is flowing through said tube, said inner membrane wall will be in substantial abutment with the internal surface of said tube while when blood ceases to flow to said tube, a slight vacuum in the blood line will cause the liquid in said closed space to flow through the perforations in said tube to cause said inner membrane wall to collapse upon itself to seal off the blood line, a blood oxygenator adapted to receive blood from a patient for oxygenating the same; means Establishing a blood flow path from said oxygenator to one of said connecting means; a blood pump; means establishing a blood flow path from the other of said connecting means to said blood pump, said blood pump being adapted to conduct oxygenated blood to the patient and further being a positive displacement pump whereby a slight vacuum may be pulled upstream of the same so that the absence of blood flowing from said oxygenator to said valve will result in said valve closing to preclude the pumping of air into the arterial system of the patient.
Claim 5
Dependent Claim
68 words
The blood oxygenating system of claim 1 wherein said inner membrane wall has a length equal to about at least ten times the cross sectional dimension of said tube; said closed space has a volume at least slightly greater than the volume of the interior of said tube along the length of the inner membrane wall; and the liquid in said closed space is a biologically harmless liquid.
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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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |