US3601128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventriculoatrial shunt accumulator
Assignee: Individual
•
Filing: 1968-12-26
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Granted: 1971-08-24
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Expires: 1988-12-26
Abstract
Abstract In a ventriculoatrial shunt, a fractional backflow of cerebrospinal fluid into the ventricular cavity is provided by a resilient accumulator chamber which responds to the pressure fluctuations of the cerebrospinal fluid. This backflow is effective to discourage clogging of the ventricular catheter by the choroid plexus, or other matter.
Inventors
- 👤 Salomon Hakim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:28
CPC Classifications
A; A61; A61M; A61M27/00; A61M27/002; A61M27/006; A61M25/00; A61M25/0021; A61M25/0023; A61M2025/0025; A61M25/10; A61M25/1011; A61M2025/1013
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
In a ventriculoatrial shunt system which includes a ventricular catheter and an implantable tube system for draining cerebrospinal fluid into the patient''s vein, an accumulator having an inlet conduit connected to said catheter and an outlet conduit connected to said tube system, a chamber communicating with said inlet and outlet conduits and having a flexible outwardly movable wall portion, wall means forming with said wall portion an enclosure, and gas within said enclosure providing resilient support to said wall portion such that variations in the pressure of the cerebrospinal fluid in said chamber cause pulsation of said wall portion thereby causing periodic fractional backflow of cerebrospinal fluid into and through the said catheter.
Claim 2
Dependent Claim
113 words
In a ventriculoatrial shunt system which includes a ventricular catheter and an implantable tube system for draining cerebrospinal fluid into the patient''s vein, an accumulator having an inlet conduit connected to said catheter and an outlet conduit connected to said tube system, a chamber communicating with said inlet and outlet conduits and having a flexible outwardly movable wall portion, wall means forming with said wall portion an enclosure, and gas within said enclosure providing resilient support to said wall portion such that variations in the pressure of the cerebrospinal fluid in said chamber cause pulsation of said wall portion thereby causing periodic fractional backflow of cerebrospinal fluid into and through the said catheter.
Claim 3
Dependent Claim
21 words
The accumulator defined by either of claim 1 wherein the outlet conduit is of lesser cross section than the inlet conduit.
Claim 4
Dependent Claim
17 words
The ventriculoatrial shunt system defined by claim 1 wherein the outlet conduit leads to a check valve.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |