US4231877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blood dialyzer
Assignee: Kuraray Co Ltd
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Filing: 1978-05-30
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Granted: 1980-11-04
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Expires: 1998-05-30
Abstract
Abstract The invention relates to a blood dialyzing apparatus comprising at least one bundle of semi-permeable hollow filaments and a cylindrical housing positioning said bundle of filaments and having a large length to inside diameter ratio of 7 to 10.
Inventors
- 👤 Kazuhisa Yamauchi
- 👤 Taku Tanaka
- 👤 Syuji Kawai
- 👤 Hirokuni Tanii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:52
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/02; B01D63/033; B01D65/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
100 words
An improved blood dialyzing apparatus comprising the combination of a cylindrical housing and at least one bundle of semi-permeable hollow filaments positioned in said housing, a blood inlet and outlet in respective ends of said housing, and a dialysate inlet and outlet in the side wall of said housing, the improvement wherein: said housing has an inside diameter in the range of 20 to 50 mm, and an effective length in the range of 200 to 350 mm, the ratio of the effective length of said housing to the inside diameter thereof being within the range of 7 to 10.
Claim 2
Dependent Claim
100 words
An improved blood dialyzing apparatus comprising the combination of a cylindrical housing and at least one bundle of semi-permeable hollow filaments positioned in said housing, a blood inlet and outlet in respective ends of said housing, and a dialysate inlet and outlet in the side wall of said housing, the improvement wherein: said housing has an inside diameter in the range of 20 to 50 mm, and an effective length in the range of 200 to 350 mm, the ratio of the effective length of said housing to the inside diameter thereof being within the range of 7 to 10.
Claim 3
Dependent Claim
51 words
The improved blood dialyzing apparatus of claim 1, wherein each of said hollow filaments has an outside diameter in the range of 200-2000μ and, the wall thickness of each of said filaments is in the range of 100 to 300μ, said bundle consisting of at least 3000 of said hollow filaments.
Claim 4
Dependent Claim
20 words
A blood dialyzing apparatus as set forth in claim 2 wherein the hollow filament is made of ethylene-vinyl alcohol copolymer.
Claim 5
Dependent Claim
22 words
A blood dialyzing apparatus as set forth in claim 2 wherein the hollow filament is made of regenerated cellulose from cuprammonium cellulose.
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) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |