US4888109A
Expired / Lapsed
US
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Hemofilter for use in a continuous arterio-venous hemofiltration
Assignee: Individual
•
Filing: 1988-11-17
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Granted: 1989-12-19
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Expires: 2008-11-17
Abstract
Abstract A hemofilter is disclosed for use in a continuous arterio-venous hemofiltration ("C.A.V.H") having a bundle of hollow fibers in which the lengths of the particular fibers of the bundle are greatest for those hollow fibers closest to the blood ports of the hemofilter and, preferably, would continuously decrease in length and be least for those particular fibers furthest from the blood ports. The fibers would, preferably, be secured in a bundle to one another by means of an epoxy resin, or similar substance, which did not interfere with the passage of blood through the hollow fibers of the system. Heparin may be chemically bound to the hollow fibers of the invention.
Inventors
- 👤 Namala L. Manohar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:11
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/02; B01D63/033; B01D2313/00; B01D2313/20; B01D2313/206; B01D2313/2061
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
106 words
A hemofilter for use in a continuous arterio-venous hemofiltration, comprising: a plurality of hollow fibers of various lengths; a casing for said plurality of hollow fibers, said casing including a plurality of blood ports; and, means for securing said plurality of hollow fibers into a bundle, said bundle being located within said casing, said plurality of hollow fibers being grouped in said bundle so that the lengths of said hollow fibers of said bundle would be greatest for those hollow fibers which were located within said bundle nearest to said blood ports and least for said hollow fibers which were located farthest from said blood ports.
Claim 2
Dependent Claim
106 words
A hemofilter for use in a continuous arterio-venous hemofiltration, comprising: a plurality of hollow fibers of various lengths; a casing for said plurality of hollow fibers, said casing including a plurality of blood ports; and, means for securing said plurality of hollow fibers into a bundle, said bundle being located within said casing, said plurality of hollow fibers being grouped in said bundle so that the lengths of said hollow fibers of said bundle would be greatest for those hollow fibers which were located within said bundle nearest to said blood ports and least for said hollow fibers which were located farthest from said blood ports.
Claim 3
Dependent Claim
54 words
The hemofilter according to claim 1, wherein said plurality of hollow fibers are grouped in said bundle so that the lengths of said hollow fibers of said bundle would be greatest for those hollow fibers centrally located within said bundle and least for said hollow fibers farthest from a central location of said bundle.
Claim 4
Dependent Claim
46 words
The hemofilter according to claim 2, wherein the various lengths of said plurality of hollow fibers within said bundle form a continuum of lengths from said centrally located hollow fibers of said bundle to said hollow fibers located farthest from the central location of said bundle.
Claim 5
Dependent Claim
23 words
The hemofilter according to claim 2, wherein said hollow fibers centrally located in said bundle have a fiber length of approximately 4.5 cm.
Claim 6
Dependent Claim
33 words
The hemofilter according to claim 2, wherein said hollow fibers located furthest from the central location of said bundle of said plurality of hollow fibers have a fiber length of approximately 1.9 cm.
Claim 7
Dependent Claim
15 words
The hemofilter according to claim 1, wherein said casing is made of a transparent plastic.
Claim 8
Dependent Claim
18 words
The hemofilter according to claim 1, further comprising at least one filtrate port as part of said casing.
Claim 9
Dependent Claim
28 words
The hemofilter according to claim 7, wherein said casing includes two of said filtrate ports positioned horizontally and opposite one another on a vertical side of said casing.
Claim 10
Dependent Claim
29 words
The hemofilter according to claim 1, wherein said means for securing said plurality of hollow fibers in said bundle includes epoxy resin headers at each end of said bundle.
Claim 11
Dependent Claim
28 words
The hemofilter according to claim 1, wherein said bundle of hollow fibers has a substantially hexagonal shape in vertical cross-sectional and a substantially circular shape in horizontal cross-section.
Claim 12
Dependent Claim
18 words
The hemofilter according to claim 1, wherein said hollow fibers of said bundle have heparin chemically bound thereto.
Claim 13
Dependent Claim
20 words
The hemofilter according to claim 1, wherein said bundle of said hollow fibers has a diameter of approximately 12.7 cm.
Claim 14
Dependent Claim
32 words
The hemofilter according to claim 1, wherein total width of said bundle of said plurality of hollow fibers is greater than the length of said bundle of said plurality of hollow fibers.
Claim 15
Dependent Claim
28 words
The hemofilter according to claim 1, wherein said plurality of blood ports of said casing includes two blood ports vertically positioned on top and bottom of said casing.
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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) | 1992-12-18 | 1993-06-19 | 1993-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-18 | 1997-06-19 | 1997-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-18 | 2001-06-19 | 2001-12-19 | $7700.00 | Window Closed / Lapsed |