US3687293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Therapeutic device
Assignee: Avon Technologies PLC
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Filing: 1970-10-30
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Granted: 1972-08-29
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Expires: 1990-10-30
Abstract
Abstract A haemodialysis unit suitable for use in an artificial kidney machine has a blood conduit which has a wall of semi-permeable material on each of closely spaced opposite sides and plastics material sheet outside and on each side of the conduit. The sheet on each side provides, with a wall of semi-permeable material on that side, walls of a passage for dialysing liquid. On each side of the conduit the sheet has parallel liquid flow-directing ribs which are directed towards and into contact with the wall of semi-permeable material. The ribs on one side of the conduit are at an angle to the ribs on the opposite side. The blood conduit may be in the form of a tube or tubes of semi-permeable material and this may be coiled together with a length of a novel form of plastics material sheet which has ribs on both sides, the ribs on one side of the sheet being at an angle to the ribs on the other side.
Inventors
- 👤 Douglas Vaughan Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:15
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/10; B01D63/101; B01D61/00; B01D61/24; B01D61/28; B01D2313/00; B01D2313/14; B01D2313/146
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
225 words
A haemodialysis unit suitable for use in an artificial kidney machine including: at least one flexible tube of semi-permeable material forming a blood conduit; means connected to each end of said tube for leading blood into and away from inside of said tube; a length of plastics material sheet having a continuous web and liquid flow-directing ribs projecting from both sides of the web, the ribs on one side of the web being parallel to each other and at an angle to the ribs on the other side of the web, the ribs on both sides being at an angle to the longitudinal direction of the said plastics material sheet, this latter mentioned angle being less than 45*; a former; and securing means for the unit; said tube and said plastics material sheet being coiled together spirally around said former and secured thereto by the securing means such that a turn of said plastics material sheet separates each pair of adjacent turns of said tube, and such that said tube has a substantially flat configuration with the two closely space side walls thereof engaging the ribs on both sides of said tube, whereby a plurality of narrow channels for dialysing fluid are formed between each respective side wall and adjacent web of the sheet, each channel extending continuously from edge to edge of the tube.
Claim 2
Dependent Claim
225 words
A haemodialysis unit suitable for use in an artificial kidney machine including: at least one flexible tube of semi-permeable material forming a blood conduit; means connected to each end of said tube for leading blood into and away from inside of said tube; a length of plastics material sheet having a continuous web and liquid flow-directing ribs projecting from both sides of the web, the ribs on one side of the web being parallel to each other and at an angle to the ribs on the other side of the web, the ribs on both sides being at an angle to the longitudinal direction of the said plastics material sheet, this latter mentioned angle being less than 45*; a former; and securing means for the unit; said tube and said plastics material sheet being coiled together spirally around said former and secured thereto by the securing means such that a turn of said plastics material sheet separates each pair of adjacent turns of said tube, and such that said tube has a substantially flat configuration with the two closely space side walls thereof engaging the ribs on both sides of said tube, whereby a plurality of narrow channels for dialysing fluid are formed between each respective side wall and adjacent web of the sheet, each channel extending continuously from edge to edge of the tube.
Claim 3
Dependent Claim
29 words
A haemodialysis unit according to claim 1 wherein said plastics material sheet is formed by extruding the plastics material and subsequently forming the ribs by means of profiling rollers.
Claim 4
Dependent Claim
29 words
A haemodialysis unit according to claim 1 wherein said plastics material sheet is formed by calendaring the plastics material and subsequently forming the ribs by means of profiling rollers.
Claim 5
Dependent Claim
29 words
A haemodialysis unit according to claim 1 wherein the height of projection of the ribs above the web is relatively small in comparison with the spacing of adjacent ribs.
Claim 6
Dependent Claim
29 words
A haemodialysis unit according to claim 4 wherein said plastics material sheet is formed by extruding the plastics material and subsequently forming the ribs by means of profiling rollers.
Claim 7
Dependent Claim
29 words
A haemodialysis unit according to claim 4 wherein said plastics material sheet is formed by calendaring the plastics material and subsequently forming the ribs by means of profiling rollers.
References Cited (Backward Citations)
US2982416A
Cited
US3077268A
Cited
FR1300140A
Cited
US3326380A
Cited
US3510004A
Cited
US3508662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |