US3901245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bio-medical pressure control device
Assignee: Bio Medical Research Ltd
•
Filing: 1973-03-15
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Granted: 1975-08-26
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Expires: 1993-03-15
Abstract
Abstract A cerebrospinal fluid anti-siphoning device for insertion into the human body to provide regulation of fluid being transported from the lateral ventricles to another part of the body. The device includes a fluid housing member through which the cerebrospinal fluid passes. The fluid housing member is adapted to contain a pair of check valves which control fluid flow through the housing member and prevent back flow from a downstream area to an upstream area. A central chamber within the fluid housing member encloses a fluid control mechanism which provides for termination of fluid flow when the downstream pressure becomes too low with respect to the upstream pressure. The fluid control mechanism includes a diaphragm which is displaced from a fluid conduit when flow is passing through the fluid housing member and is positioned contiguous to the conduit opening when the downstream pressure is too low, thereby effectively terminating the flow of the cerebrospinal fluid through the fluid housing member. The device includes a mechanism for manually actuating the flow through the outlet area of the housing member even when the antisiphoning device has been implanted within the human body.
Inventors
- 👤 Eugene B Spitz
- 👤 Gene H Samuelson
- 👤 Richard E Brenz
- 👤 Charles C Hansford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:46
CPC Classifications
A; A61; A61M; A61M27/00; A61M27/002; A61M27/006; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7835; Y10T137/7836
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
208 words
A cerbrospinal fluid anti-syphoning device comprising: a. fluid housing means having a central chamber, said fluid housing means including a flexible dome forming an upper surface of said central chamber, said flexible dome adapted to be depressable into said central chamber for increasing fluid pressure therein; b. inlet means in fluid communication with said central chamber for insertion of said fluid into said chamber; c. outlet means in fluid communication with said central chamber for transport of said fluid from said chamber; d. fluid egress conduit means extending internal said central chamber and in fluid communication with said outlet means; e. flexible diaphragm means forming a lower continuous surface of said central chamber, said diaphragm means being positionally located adjacent said fluid egress conduit means, said diaphragm means adapted to block flow of said fluid through said fluid egress conduit means when a fluid pressure differential between said inlet and outlet means is less than a predetermined value; and, f. diaphragm restraint means secured to said housing and positioned below said diaphragm means for preventing said flexible diaphragm means from being externally displaced from said housing means when said flexible dome is depressed, said diaphragm restraint means being a plate member having at least one opening passing therethrough.
Claim 2
Dependent Claim
208 words
A cerbrospinal fluid anti-syphoning device comprising: a. fluid housing means having a central chamber, said fluid housing means including a flexible dome forming an upper surface of said central chamber, said flexible dome adapted to be depressable into said central chamber for increasing fluid pressure therein; b. inlet means in fluid communication with said central chamber for insertion of said fluid into said chamber; c. outlet means in fluid communication with said central chamber for transport of said fluid from said chamber; d. fluid egress conduit means extending internal said central chamber and in fluid communication with said outlet means; e. flexible diaphragm means forming a lower continuous surface of said central chamber, said diaphragm means being positionally located adjacent said fluid egress conduit means, said diaphragm means adapted to block flow of said fluid through said fluid egress conduit means when a fluid pressure differential between said inlet and outlet means is less than a predetermined value; and, f. diaphragm restraint means secured to said housing and positioned below said diaphragm means for preventing said flexible diaphragm means from being externally displaced from said housing means when said flexible dome is depressed, said diaphragm restraint means being a plate member having at least one opening passing therethrough.
Claim 3
Dependent Claim
50 words
The cerebrospinal fluid anti-siphoning device as recited in claim 1 where said flexible diaphragm means is displaced from said fluid conduit means when said pressure differential between said inlet means and said outlet means is less than a predetermined value and said fluid is being transported through said central chamber.
Claim 4
Dependent Claim
53 words
The cerebrospinal fluid anti-siphoning device as recited in claim 1 where said flexible diaphragm means is contiguous to a fluid passage opening of said fluid conduit means when said pressure differential between said inlet means and said outlet means exceeds said predetermined valve thereby blocking flow of said fluid to said outlet means.
Claim 5
Dependent Claim
59 words
The cerebrospinal fluid anti-siphoning device as recited in claim 1 where said fluid egress conduit means includes an L-shaped conduit having a first end connected to and in fluid communication with said outlet means and a second end adjacent said diaphragm means forming a fluid passage opening for transport of said fluid within said chamber to said outlet means.
Claim 6
Dependent Claim
36 words
The cerebrospinal fluid anti-siphoning device as recited in claim 4 where said second end of said conduit provides a contact area with said diaphragm means greater than the flow area of said fluid through said conduit.
Claim 7
Dependent Claim
18 words
The cerebrospinal fluid anti-siphoning device as recited iN claim 1 where said valve means is constructed of silicone.
Claim 8
Dependent Claim
38 words
The cerebrospinal fluid anti-siphoning device as recited in claim 1 where said flexible dome is adapted to be compressed into said chamber for increasing the fluid pressure within said chamber thereby displacing said fluid through said outlet means.
Claim 9
Dependent Claim
19 words
The cerebrospinal fluid anti-siphoning device as recited in claim 7 where said flexible dome is constructed of silicone rubber.
Claim 10
Dependent Claim
35 words
The cerebrospinal fluid anti-siphoning device as recited in claim 1 where said diaphragm restraint means includes a plate member displaced from said diaphragm means, said plate member being fixedly secured to said fluid housing means.
Claim 11
Dependent Claim
21 words
The cerebrospinal fluid anti-siphoning device as recited in claim 9 where said plate member includes a plurality of openings passing therethrough.
Claim 12
Dependent Claim
18 words
The cerebrospinal fluid anti-siphoning device as recited in claim 10 where said plate member is constructed of nylon.
Claim 13
Dependent Claim
25 words
The cerebrospinal fluid anti-siphoning device as recited in claim 1 where said diaphragm restraint means includes a grid member mounted to said fluid housing means.
Claim 14
Dependent Claim
18 words
The cerebrospinal fluid anti-siphoning device as recited in claim 12 where said grid member is constructed of nylon.
Claim 15
Dependent Claim
43 words
The cerebrospinal anti-siphoning device as recited in claim 1 including inlet valve means inserted within said inlet means of said fluid housing means for transporting said fluid into said central chamber when said inlet fluid pressure is in excess of a predetermined value.
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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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |