US4549879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valved two-way catheter
Assignee: GROSHONG & BRAWN
•
Filing: 1983-05-03
•
Granted: 1985-10-29
•
Expires: 2003-05-03
Abstract
Abstract Catheter of soft, flexible material is formed with closed end. Fluid opening formed by single slit through tubing wall of such length that valve will open only upon application of predetermined pressure differentials. Removable stiffener member is positioned in catheter, abutting closed end to push catheter into body vessel when inserting.
Inventors
- 👤 LeRoy E. Groshong
- 👤 Ronald J. Brawn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:59
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0067; A61M25/0074; A61M25/0075; A61M25/0043; A61M2025/0063
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
122 words
A closed ended tubular catheter of silicon rubber of less than 100 durometer hardness, and a two-way valve in the side wall of said catheter, said valve consisting of a single, normally closed, linearly extending slit extending through the catheter wall, said slit having such length that when predetermined pressure differentials within and without the catheter exist, the catheter wall contiguous the slit deforms and causes the opposed faces of the slit to withdraw from one another and form a temporary orifice through which fluid may be infused or withdrawn the valve area and contiguous catheter wall having been treated with dimethylsiloxane so as to weaken and make more pliable the treated catheter wall in order to facilitate the two-way valve function.
Claim 2
Dependent Claim
122 words
A closed ended tubular catheter of silicon rubber of less than 100 durometer hardness, and a two-way valve in the side wall of said catheter, said valve consisting of a single, normally closed, linearly extending slit extending through the catheter wall, said slit having such length that when predetermined pressure differentials within and without the catheter exist, the catheter wall contiguous the slit deforms and causes the opposed faces of the slit to withdraw from one another and form a temporary orifice through which fluid may be infused or withdrawn the valve area and contiguous catheter wall having been treated with dimethylsiloxane so as to weaken and make more pliable the treated catheter wall in order to facilitate the two-way valve function.
Claim 3
Dependent Claim
131 words
A closed ended tubular catheter of silicon rubber of about 59 durometer hardness, and a two-way valve in the side wall of said catheter, said valve consisting of a single, normally closed, linearly extending slit extending through the catheter wall, said slit having such length that when predetermined pressure differentials within and without the catheter exist, the catheter wall contiguous the slit deforms and causes the opposed faces of the slit to withdraw from one another and form a temporary orifice through which fluid may be infused or withdrawn, said catheter having an outer diameter of 0.089 inch, an inner diameter of 0.052 inch, said slit has a length of 0.250 inch and the valve faces and catheter wall surrounding the valve having been immersed in dimethylsiloxane for about five minutes.
Claim 4
Dependent Claim
131 words
A closed ended tubular catheter of silicon rubber of about 59 durometer hardness, and a two-way valve in the side wall of said catheter, said valve consisting of a single, normally closed, linearly extending slit extending through the catheter wall, said slit having such length that when predetermined pressure differentials within and without the catheter exist, the catheter wall contiguous the slit deforms and causes the opposed faces of the slit to withdraw from one another and form a temporary orifice through which fluid may be infused or withdrawn, said catheter having an outer diameter of 0.089 inch, an inner diameter of 0.052 inch, said slit has a length of 0.250 inch and the valve faces and catheter wall surrounding the valve having been immersed in dimethylsiloxane for about five minutes.
References Cited (Backward Citations)
US2393003A
Cited
US3020913A
Cited
US3128769A
Cited
US3885561A
Cited
US4434810A
Cited
US4475898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |