US3683929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for draining cerebrospinal fluid in cases of hydrocephalus
Assignee: Extracorporeal Medical Specialties Inc
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Filing: 1970-12-28
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Granted: 1972-08-15
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Expires: 1990-12-28
Abstract
Abstract A device for the draining of cerebrospinal fluid (CSF) in cases of hydrocephalus, of the type having upstream and downstream normally closed check valves which are designed to pass CSF in one direction only in response to predetermined values of fluid pressure, and having a pumping chamber between the valves for manipulation to insure that the device is functioning properly, the pumping chamber having an enlarged bulbous portion with a lateral dimension substantially greater than the diameter of the remainder of the device, the enlarged bulbous portion being molded to shape from medical grade silicone rubber, and having flow direction or other indicia molded thereon.
Inventors
- 👤 John W Holter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:13
CPC Classifications
A; A61; A61M; A61M27/00; A61M27/002; A61M27/006
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
224 words
A device for the draining of cerebrospinal fluid in cases of hydrocephalus comprising a non-flexible upstream tubular member adapted to be positioned along a rongeured slot in the patient''s skull, a non-flexible downstream tubular member, a normally closed one-way check valve supported within each tubular member, the check valves each including a thin walled flexible member in the form of a thimble provided with slit means expandable between open and closed positions and being arranged to open and permit flow of fluid therethrough in response to a predetermined value of fluid pressure on the upstream side thereof, a flexible pumping chamber directly molded to shape from flexible tissue compatible material, the pumping chamber including an upper tubular portion stretched around the upstream tubular member and a lower tubular portion stretched around the downstream tubular member to provide fluid-tight connections thereto and to position the upstream and downstream tubular members generally co-axially with respect to each other, the pumping chamber further including a mid-section having an enlarged bulbous portion with a lateral dimension substantially greater than the diameter of the upper and lower tubular portions when they are stretched around the upstream and downstream tubular members, the lateral dimension of the bulbous portion being sufficiently great to prevent the device from being inadvertantly depressed through the patient''s skull in the area of the rongeured slot.
Claim 2
Independent Claim
224 words
A device for the draining of cerebrospinal fluid in cases of hydrocephalus comprising a non-flexible upstream tubular member adapted to be positioned along a rongeured slot in the patient''s skull, a non-flexible downstream tubular member, a normally closed one-way check valve supported within each tubular member, the check valves each including a thin walled flexible member in the form of a thimble provided with slit means expandable between open and closed positions and being arranged to open and permit flow of fluid therethrough in response to a predetermined value of fluid pressure on the upstream side thereof, a flexible pumping chamber directly molded to shape from flexible tissue compatible material, the pumping chamber including an upper tubular portion stretched around the upstream tubular member and a lower tubular portion stretched around the downstream tubular member to provide fluid-tight connections thereto and to position the upstream and downstream tubular members generally co-axially with respect to each other, the pumping chamber further including a mid-section having an enlarged bulbous portion with a lateral dimension substantially greater than the diameter of the upper and lower tubular portions when they are stretched around the upstream and downstream tubular members, the lateral dimension of the bulbous portion being sufficiently great to prevent the device from being inadvertantly depressed through the patient''s skull in the area of the rongeured slot.
Claim 3
Dependent Claim
83 words
A device for the draining of cerebrospinal fluid as in claim 1 wherein the flexible pumping chamber is directly molded to shape from medical grade silicone rubber, the lateral dimension of the bulbous portion is sufficiently great to be readily distinguished by fingertip feel from the upper and lower tubular portions despite an overlying layer of the patient''s skin, and at least one of the non-flexible tubular members includes identificAtion indicia thereon which is visible through the silicone rubber tubular portion stretched therearound.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |