Patent US3834386A successfully refreshed from Google Patents.
US3834386A
Expired / Lapsed
US
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Blood drip chamber
Assignee: Sweden Freezer
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Filing: 1972-09-07
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Granted: 1974-09-10
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Expires: 1992-09-07
Abstract
Abstract A blood drip chamber is provided with a cap having a large penetration area which includes a self-sealing rubber supported by a layer of stiffer material. The inner surface of the stiffening material is at the same general level as the remainder of the inner surface of the cap so that blood is not held by capillary action in the penetration area. The blood drip chamber includes a reservoir having a sidewall, a lower discharge port and an upper end. A blood inlet port is positioned centrally in the cap so that the inflow of blood is maintained away from the sidewalls of the reservoir.
Inventors
- 👤 J Sisley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:23
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/1411; A61M1/00; A61M1/36; A61M1/3621; A61M1/3627
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
217 words
A blood drip chamber for hemodialysis or the like comprising a reservoir for holding a quantity of blood and having a lower end with a discharge port, an upper end, and sidewalls extending between said ends; and a cap covering said upper end, said cap having a generally centrally located inlet port means for directing blood into said reservoir inwardly away from the sidewalls of the reservoir and for forming a pool of blood at the bottom of the reservoir, and penetration means in said cap for introducing a syringe needle into said reservoir and including a self-sealing medium for closing the penetration means when the needle is withdrawn, said penetration means extending approximately at least a third of the way around said inlet port means for providing a large penetration area for a syringe needle, said penetration means including a layer of stiffening material bonded to the underside of the self-sealing material for avoiding contaminable air gaps between the self-sealing material and for supporting the self-sealing material when a syringe needle is inserted or withdrawn by strengthening the self-sealing material for withstanding the stress resulting from multiple insertions of the syringe needle, said stiffening material being bonded to said self-sealing medium over substantially the entire area of contact between said self-sealing medium and said stiffening material.
Claim 2
Dependent Claim
217 words
A blood drip chamber for hemodialysis or the like comprising a reservoir for holding a quantity of blood and having a lower end with a discharge port, an upper end, and sidewalls extending between said ends; and a cap covering said upper end, said cap having a generally centrally located inlet port means for directing blood into said reservoir inwardly away from the sidewalls of the reservoir and for forming a pool of blood at the bottom of the reservoir, and penetration means in said cap for introducing a syringe needle into said reservoir and including a self-sealing medium for closing the penetration means when the needle is withdrawn, said penetration means extending approximately at least a third of the way around said inlet port means for providing a large penetration area for a syringe needle, said penetration means including a layer of stiffening material bonded to the underside of the self-sealing material for avoiding contaminable air gaps between the self-sealing material and for supporting the self-sealing material when a syringe needle is inserted or withdrawn by strengthening the self-sealing material for withstanding the stress resulting from multiple insertions of the syringe needle, said stiffening material being bonded to said self-sealing medium over substantially the entire area of contact between said self-sealing medium and said stiffening material.
Claim 3
Dependent Claim
29 words
The blood drip chamber of claim 1, said penetration means including an inner surface at generally the same level as the inner surface of the remainder of said cap.
Claim 4
Dependent Claim
162 words
A blood drip chamber for hemodialysis or the like comprising a reservoir for holding a quantity of blood and having a lower end with a discharge port, an upper end, and sidewalls extending between said ends; and a cap covering said upper end, said cap having an inlet port means for directing blood into said reservoir away from the sidewalls of the reservoir and for forming a pool of blood at the bottom of the reservoir, and a penetration area covering a substantial region of said cap for the insertion of a syringe needle through said cap, said penetration area including a soft self-sealing material, and a layer of supporting material below said self-sealing material and bonded thereto over substantially the area of contact between said self sealing medium and said supporting material to prevent contamination of the surfaces between the self-sealing material and the supporting material and to support the latter from stress of a syring needle when inserted or withdrawn.
Claim 5
Dependent Claim
162 words
A blood drip chamber for hemodialysis or the like comprising a reservoir for holding a quantity of blood and having a lower end with a discharge port, an upper end, and sidewalls extending between said ends; and a cap covering said upper end, said cap having an inlet port means for directing blood into said reservoir away from the sidewalls of the reservoir and for forming a pool of blood at the bottom of the reservoir, and a penetration area covering a substantial region of said cap for the insertion of a syringe needle through said cap, said penetration area including a soft self-sealing material, and a layer of supporting material below said self-sealing material and bonded thereto over substantially the area of contact between said self sealing medium and said supporting material to prevent contamination of the surfaces between the self-sealing material and the supporting material and to support the latter from stress of a syring needle when inserted or withdrawn.
Claim 6
Dependent Claim
25 words
The blood drip chamber of claim 3 said supporting material lying generally in the plane of the inner surface of the remainder of said cap.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |