US4172794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow fiber dialyser
Assignee: Dr Eduard Fresenius Chemisch Pharmazeutische Industrie KG Apparatebau KG
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Filing: 1978-04-27
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Granted: 1979-10-30
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Expires: 1998-04-27
Abstract
Abstract A hollow fiber dialyser comprises a webbing of hollow fibers. A loose warphread at each end of a webbing wound on a core, acts as a wick barrier to prevent sealant from leaking into the interstices between the hollow fibers. A tight warp thread nearest the open ends of the fibers pinches off the free inner cross section of each hollow fiber to prevent sealant from penetrating into the hollow fibers.
Inventors
- 👤 Jan-Erik Sigdell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:27
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/02; B01D63/021; B01D63/0231; B01D63/022; B01D63/0221
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
A hollow fiber dialyser comprising core means, hollow fibers arranged about the core means in a ring formation, thread means binding said hollow fibers (10) to one another to form a web (11) of hollow fibers, said thread means extending across the web which is wrapped around the core means, said thread means comprising warp thread means (21) which are looped loosely as a wick barrier around the hollow fibers at each end of said web to prevent poured sealant (14) from leaking through between the hollow fibers by capillary action while the facing ends are being poured, said thread means further comprising closure thread means (20) at each end of said web, said closure thread means looping tightly around said hollow fibers for pinching off the free cross-section of said hollow fibers, whereby poured sealant is prevented from penetrating into the hollow fibers.
Claim 2
Dependent Claim
144 words
A hollow fiber dialyser comprising core means, hollow fibers arranged about the core means in a ring formation, thread means binding said hollow fibers (10) to one another to form a web (11) of hollow fibers, said thread means extending across the web which is wrapped around the core means, said thread means comprising warp thread means (21) which are looped loosely as a wick barrier around the hollow fibers at each end of said web to prevent poured sealant (14) from leaking through between the hollow fibers by capillary action while the facing ends are being poured, said thread means further comprising closure thread means (20) at each end of said web, said closure thread means looping tightly around said hollow fibers for pinching off the free cross-section of said hollow fibers, whereby poured sealant is prevented from penetrating into the hollow fibers.
Claim 3
Dependent Claim
35 words
The hollow fiber dialyser of claim 1, wherein the hollow fibers (10) are arranged in parallel to one another, said binding thread means (16, 17) running lengthwise of said web but across said hollow fibers.
Claim 4
Dependent Claim
53 words
The hollow fiber dialyser of claim 1 or 2, wherein said warp thread means comprise at least one warp thread (21) located at a distance apart from the closure thread means (20), whereby the closure thread means (20) are located between the respective warp thread (21) and the end of the hollow fibers.
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) | 1982-10-29 | 1983-04-30 | 1983-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-29 | 1987-04-30 | 1987-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-29 | 1991-04-30 | 1991-10-30 | $7700.00 | Window Closed / Lapsed |