US4103689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tissue pressure reference for cerebrospinal fluid shunting device
Assignee: Individual
•
Filing: 1976-12-13
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Granted: 1978-08-01
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Expires: 1996-12-13
Abstract
Abstract A device to be used as part of an artificial shunt for abnormal intracranial pressure conditions. A compliant tube of unique cross-section acts as a pressure regulator, preventing siphoning of cerebrospinal fluid under conditions of reduced pressure at the distal end of the shunt.
Inventors
- 👤 Stephen Beecher Leighton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:02
CPC Classifications
A; A61; A61M; A61M27/00; A61M27/002; A61M27/006
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
A hydrocephalus shunt system comprising an inlet tube for connection to the ventricles of the brain, and an outlet tube for connection to a body cavity downstream, and interposed there between a pressure regulating collapsible tube, the improvement wherein said collapsible tube consists of an annular walled structure of compliant material having closely juxtaposed sides such that in the relaxed position of zero transmural pressure, the lumen of the tube has a substantially closed cross-section and wherein the collapsible section is substantially free of a case or compartment or enclosure or inner wall spacing means of any kind and wherein intimate contact of the collapsible section with body tissue is maintained said collapsible tube being connected to and supported at its ends by said inlet and outlet tubes.
Claim 2
Dependent Claim
128 words
A hydrocephalus shunt system comprising an inlet tube for connection to the ventricles of the brain, and an outlet tube for connection to a body cavity downstream, and interposed there between a pressure regulating collapsible tube, the improvement wherein said collapsible tube consists of an annular walled structure of compliant material having closely juxtaposed sides such that in the relaxed position of zero transmural pressure, the lumen of the tube has a substantially closed cross-section and wherein the collapsible section is substantially free of a case or compartment or enclosure or inner wall spacing means of any kind and wherein intimate contact of the collapsible section with body tissue is maintained said collapsible tube being connected to and supported at its ends by said inlet and outlet tubes.
Claim 3
Dependent Claim
11 words
The device of claim 1 combined with a differential pressure valve.
Claim 4
Dependent Claim
24 words
The device of claim 1 wherein the collapsible section comprises two flat strips bonded together along their edges parallel to the axis of flow.
Claim 5
Independent Claim
38 words
The device of claiim 1 wherein the collapsible section comprises a slit for a fluid passage, said slit having rounded edges to prevent stress concentrations, said rounded edges being filled to prevent fluid flow in the relaxed state.
Claim 6
Independent Claim
38 words
The device of claiim 1 wherein the collapsible section comprises a slit for a fluid passage, said slit having rounded edges to prevent stress concentrations, said rounded edges being filled to prevent fluid flow in the relaxed state.
Claim 7
Dependent Claim
13 words
The device of claim 1 wherein the collapsible section comprises a cruciate cross-section.
References Cited (Backward Citations)
FR1211941A
Cited
US3463159A
Cited
US3396448A
Cited
US3624800A
Cited
US3733046A
Cited
US3769982A
Cited
US3991768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |