US3889687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shunt system for the transport of cerebrospinal fluid
Assignee: Individual
•
Filing: 1974-01-31
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Granted: 1975-06-17
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Expires: 1994-01-31
Abstract
Abstract A shunt system is disclosed for treating hydrocephalus by transporting cerebrospinal fluid from a source of such fluid to a selected site in the body of the patient, wherein the fluid is conducted through tubing in which a pressure-operated check valve is included, and connected in series with that valve is a second valve including gravity-operated means effective to urge the second valve to closed position until a higher pressure is reached when the patient is in substantially vertical position and to permit the valve to open freely when the patient is in substantially horizontal position, thus compensating for the pressure drop and consequent siphoning of fluid which would otherwise occur when the patient moves from horizontal to vertical position.
Inventors
- 👤 Donald L Harris
- 👤 Salomon Hakim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:36
CPC Classifications
A; A61; A61M; A61M27/00; A61M27/002; A61M27/006; Y; Y10; Y10T; Y10T137/00; Y10T137/0753
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A shunt system for transporting cerebrospinal fluid from a source of such fluid within the body to a selected site within the body, comprising tubing for connection to the source of fluid, a pressure-operated check valve connected to said tubing, a second valve connected in series to the check valve, separate means connected with said second valve and responsive to the force of gravity for causing said second valve to open at a higher pressure when the valve is substantially vertical and permitting the valve to open freely when the valve is substantially horizontal, and tubing connected in series with said second valve for connection to a site in the body to which the fluid is to be transported.
Claim 2
Dependent Claim
119 words
A shunt system for transporting cerebrospinal fluid from a source of such fluid within the body to a selected site within the body, comprising tubing for connection to the source of fluid, a pressure-operated check valve connected to said tubing, a second valve connected in series to the check valve, separate means connected with said second valve and responsive to the force of gravity for causing said second valve to open at a higher pressure when the valve is substantially vertical and permitting the valve to open freely when the valve is substantially horizontal, and tubing connected in series with said second valve for connection to a site in the body to which the fluid is to be transported.
Claim 3
Dependent Claim
183 words
A shunt system for draining excess cerebrospinal fluid, comprising tubing for connection to a source of cerebrospinal fluid, a valve casing, a first pressure-operated check valve disposed in said casing, and a second valve disposed in said casing and connected in series with said first valve; said second valve includinG a valve seat, a first ball in said casing dimensioned to rest either on said seat or displaced from said seat, at least one other ball disposed in said casing in position to bear upon said first ball when the valve casing is in vertical position and free to roll in said casing when the valve casing is in horizontal position; and tubing connected in series with said second valve for connection to a site within the body to which the fluid is to be transported, whereby the valve casing may be so mounted in the body that only the first valve operates in response to an increase in pressure when the patient is in horizontal position but both valves open under an increase in pressure when the patient is in vertical position.
Claim 4
Dependent Claim
183 words
A shunt system for draining excess cerebrospinal fluid, comprising tubing for connection to a source of cerebrospinal fluid, a valve casing, a first pressure-operated check valve disposed in said casing, and a second valve disposed in said casing and connected in series with said first valve; said second valve includinG a valve seat, a first ball in said casing dimensioned to rest either on said seat or displaced from said seat, at least one other ball disposed in said casing in position to bear upon said first ball when the valve casing is in vertical position and free to roll in said casing when the valve casing is in horizontal position; and tubing connected in series with said second valve for connection to a site within the body to which the fluid is to be transported, whereby the valve casing may be so mounted in the body that only the first valve operates in response to an increase in pressure when the patient is in horizontal position but both valves open under an increase in pressure when the patient is in vertical position.
Claim 5
Dependent Claim
123 words
A shunt system for draining excess cerebrospinal fluid from a source of such fluid within the body to a selected site within the body, comprising tubing for connection to the source of fluid, a casing, a check valve disposed within said casing and connected to said tubing; a second valve disposed within said casing and including a valve seat, a ball cooperating with said valve seat, and at least one weight disposed adjacent said ball in position to bear upon the ball when the valve is in substantially vertical position and free to move away from the ball when the valve is in substantially horizontal position, said valves being connected in series, and tubing connected to the discharge side of said second valve.
Claim 6
Dependent Claim
123 words
A shunt system for draining excess cerebrospinal fluid from a source of such fluid within the body to a selected site within the body, comprising tubing for connection to the source of fluid, a casing, a check valve disposed within said casing and connected to said tubing; a second valve disposed within said casing and including a valve seat, a ball cooperating with said valve seat, and at least one weight disposed adjacent said ball in position to bear upon the ball when the valve is in substantially vertical position and free to move away from the ball when the valve is in substantially horizontal position, said valves being connected in series, and tubing connected to the discharge side of said second valve.
Claim 7
Dependent Claim
15 words
The shunt system defined in claim 1 wherein said means comprises at least one ball.
Claim 8
Dependent Claim
13 words
The shunt system defined in claim 3 wherein the weight is a ball.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |