Patent US3924635A successfully refreshed from Google Patents.
US3924635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventricular shunt having a variable pressure valve
Assignee: Individual
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Filing: 1974-06-12
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Granted: 1975-12-09
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Expires: 1994-06-12
Abstract
Abstract Proper cerebral hydraulic conditions may be maintained in the treatment of hydrocephalus by means of a ventricular shunt having a variable operating pressure valve, such that the CSF pressure may be controlled according to the size of the ventricle to correct the imbalance of forces developed by the CSF pressure against the ventricular area. These forces can be sensed in the dural region and utilized to control the operating pressure setting of the valve.
Inventors
- 👤 Salomon Hakim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:09
CPC Classifications
A; A61; A61M; A61M27/00; A61M27/002; A61M27/006; A61M2027/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
A cerebrovascular shunt valve comprising a resilient valve body adapted to be inserted into the dural region, said valve body having opposed wall portions adapted to bear against the skull and the brain respectively; a resilient tube which extends into said valve body between said wall portions and is adapted for connection to a ventricular catheter, the end of the tube being closed within the valve body, there being a slit in the side wall of the tube within said valve body for communicating CSF from said catheter into said valve body, said slit extending in a direction normal to the direction of the longitudinal axis of the tube and positioned between said opposed wall portions thereby being oriented with respect to the wall portions of said valve body to produce opening of said slit when said wall portions are driven against said tube by pressure of the brain against the skull; and outlet means for ventinG CSF from said valve body to a location outside of the skull.
Claim 2
Dependent Claim
169 words
A cerebrovascular shunt valve comprising a resilient valve body adapted to be inserted into the dural region, said valve body having opposed wall portions adapted to bear against the skull and the brain respectively; a resilient tube which extends into said valve body between said wall portions and is adapted for connection to a ventricular catheter, the end of the tube being closed within the valve body, there being a slit in the side wall of the tube within said valve body for communicating CSF from said catheter into said valve body, said slit extending in a direction normal to the direction of the longitudinal axis of the tube and positioned between said opposed wall portions thereby being oriented with respect to the wall portions of said valve body to produce opening of said slit when said wall portions are driven against said tube by pressure of the brain against the skull; and outlet means for ventinG CSF from said valve body to a location outside of the skull.
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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |