Patent US3674050A successfully refreshed from Google Patents.
US3674050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Check valve for drainage of fluid into the vascular system or into a body cavity for the treatment of hydrocephalus internus and externus
Assignee: Individual
•
Filing: 1970-05-04
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Granted: 1972-07-04
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Expires: 1990-05-04
Abstract
Abstract The check valve for drainage of fluid into the vascular system or into a body cavity for the treatment of hydrocephalus internus and externus is fabricated of synthetic material and has a body with screw thread on each side. On the proximal side of the valve is screwed a connector, which has a cone and a cylindrical part to receive a proximal catheter, in addition to a screw thread for the fixing of a screw cap. On the connector is a shoulder serving as a stop for the screw cap and preventing shearing of the proximal catheter. The connector has a longitudinal bore which drains the fluid into the catheter, the bore widens to a cone and this cone is obturated by a piston, which possesses four longitudinal slots. A spring lays in the bore and can be adjusted by a regulating screw for the purpose of pressure calibration of the fluid.
Inventors
- 👤 Francois Kuffer
- 👤 Dietrich Strub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:52
CPC Classifications
A; A61; A61M; A61M27/00; A61M27/002; A61M27/006; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7923
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
351 words
A check valve for draining fluid into the vascular system or into a body cavity for the treatment of hydrocephalus internus and externus, comprising a cylindrical body having a longitudinal bore and which has inlet and outlet ends thereof with screw threads in said ends; a proximal connector having first screw threads in threaded engagement with the screw threads in the inlet end of said body and closing said inlet end, said connector having a cone shaped part insertable in an end of a proximal catheter, a cylindrical part with an external screw threads and a shoulder between said cylindrical part and said first screw threads, a screw cap which has a bore with an internal cone shaped portion on a different slant from that of said connector cone shaped part and a cylindrical portion being in threaded engagement with said connector cylindrical part external screw threads whereby said cap can retain said proximal catheter end on said proximal connector, said screw cap being seated on said shoulder which serves as a stop for said screw cap, said connector having a longitudinal bore for the passage of the fluid which bore widens to a cone, a piston slideably mounted in said body bore, having a closed end bore, a conical end slideably in said bore cone for closing the same and four longitudinal slots on its periphery for ensuring the flow of fluid, a spring inside said piston bore away from the fluid, a regulating screw having a cylindrical part providing a stop for said spring and having said piston slideable thereon, said regulating screw having a screw threaded peripheral part in which are situated four longitudinal slots for the flow of fluid and which is in threaded engagement with the screw threads in the outlet end of said body, a distal connector, is threadably mounted in the outlet end of said body, has a end portion insertable in an end of a distal catheter and a longitudinal bore and a second cap detachably connected to said distal connector and capable of retaining said distal catheter end on said distal connector.
Claim 2
Dependent Claim
351 words
A check valve for draining fluid into the vascular system or into a body cavity for the treatment of hydrocephalus internus and externus, comprising a cylindrical body having a longitudinal bore and which has inlet and outlet ends thereof with screw threads in said ends; a proximal connector having first screw threads in threaded engagement with the screw threads in the inlet end of said body and closing said inlet end, said connector having a cone shaped part insertable in an end of a proximal catheter, a cylindrical part with an external screw threads and a shoulder between said cylindrical part and said first screw threads, a screw cap which has a bore with an internal cone shaped portion on a different slant from that of said connector cone shaped part and a cylindrical portion being in threaded engagement with said connector cylindrical part external screw threads whereby said cap can retain said proximal catheter end on said proximal connector, said screw cap being seated on said shoulder which serves as a stop for said screw cap, said connector having a longitudinal bore for the passage of the fluid which bore widens to a cone, a piston slideably mounted in said body bore, having a closed end bore, a conical end slideably in said bore cone for closing the same and four longitudinal slots on its periphery for ensuring the flow of fluid, a spring inside said piston bore away from the fluid, a regulating screw having a cylindrical part providing a stop for said spring and having said piston slideable thereon, said regulating screw having a screw threaded peripheral part in which are situated four longitudinal slots for the flow of fluid and which is in threaded engagement with the screw threads in the outlet end of said body, a distal connector, is threadably mounted in the outlet end of said body, has a end portion insertable in an end of a distal catheter and a longitudinal bore and a second cap detachably connected to said distal connector and capable of retaining said distal catheter end on said distal connector.
Claim 3
Dependent Claim
16 words
A check valve according to the claim 1 wherein said body and connectors are of polyphenylenoxide.
Claim 4
Dependent Claim
52 words
A check valve according to the claim 1, wherein said body bore has a chamber between said piston and said regulating screw in which the fluid can accumulate and load the piston to avoid a back flow of blood and fluid and thus to urge the piston into its connector closing position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |