US3759289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfusion safety valve
Assignee: WALL R DE
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Filing: 1972-09-27
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Granted: 1973-09-18
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Expires: 1992-09-27
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
- 👤 Wall R De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:40
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/36; A61M1/00; A61M1/36; A61M1/3621; A61M39/00; A61M39/22; A61M39/227; A61M39/228; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/788
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
143 words
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.
Claim 2
Dependent Claim
143 words
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.
Claim 3
Dependent Claim
175 words
A perfusion safety valve comprising an elongated, rigid perforated tube; an inner, flexible membrane wall disposed about the inner periphery of said tube, said membrane wall being formed of a material compatible with blood and having a length equal to about at least ten times the cross sectional dimension of said tube; an outer membrane wall disposed about the exterior periphery of said tube; said inner and outer membrane walls being arranged with respect to each other and with respect to said tube so as to define a closed space having a volume at least slightly greater than the volume of the interior of said tube along the length of the inner membrane wall; and a biologically harmless liquid within said closed space; said inner membrane wall being adapted to be in substantial abutment with the interior of said tube to permit blood to flow therethrough and adapted to collapse in said tube upon itself upon flow of said liquid through the perforations in said tube to stop the flow of blood through said tube.
Claim 4
Dependent Claim
175 words
A perfusion safety valve comprising an elongated, rigid perforated tube; an inner, flexible membrane wall disposed about the inner periphery of said tube, said membrane wall being formed of a material compatible with blood and having a length equal to about at least ten times the cross sectional dimension of said tube; an outer membrane wall disposed about the exterior periphery of said tube; said inner and outer membrane walls being arranged with respect to each other and with respect to said tube so as to define a closed space having a volume at least slightly greater than the volume of the interior of said tube along the length of the inner membrane wall; and a biologically harmless liquid within said closed space; said inner membrane wall being adapted to be in substantial abutment with the interior of said tube to permit blood to flow therethrough and adapted to collapse in said tube upon itself upon flow of said liquid through the perforations in said tube to stop the flow of blood through said tube.
Claim 5
Dependent Claim
27 words
The valve of claim 2 further including barbed, tubular extensions on both ends of said tube adapted to be sealingly received in a flexible blood conduit tubing.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |