US3841491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dialysis apparatus
Assignee: Gambro AG
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Filing: 1973-04-02
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Granted: 1974-10-15
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Expires: 1993-04-02
Abstract
Abstract A dialysis apparatus, particularly for purifying blood includes an assembly of flat supporting plates stacked together with pairs of membranes interposed between the sides of adjacent plates. These membranes form passageways between them for the liquid to be purified, and other passageways are formed between each plate and the adjacent membrane for circulating the purifying liquid. The assembly of supporting plates and membrane pairs are traversed by tubular shafts for the purifying liquid and these shafts include distributing disks which clamp the respective pairs of membranes to the adjacent support plate.
Inventors
- 👤 O Hagstrom
- 👤 G Riede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:24
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/08; B01D63/082; B01D63/084; B01D61/00; B01D61/24; B01D61/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
253 words
A dialysis apparatus comprising a plurality of stacked supporting plates and a plurality of pairs of membranes, each pair of membranes being disposed between a pair of plates and in stacked relation therewith, said plates being provided with grooves facing said pairs of membrances to permit passage of a liquid to be purified between the membranes of each pair and to permit passage of a purifying liquid between the outside of each pair of membranes and the surface of the adjacent plate, said stack of plates and membranes being provided with holes therethrough forming a distributing passage extending transversely of the stack of plates and membranes for introducing a purifying liquid, annular button-like distributing members disposed in a recess provided in one side of each plate, the center opening of each annular distributing member coinciding with the transverse distributing passage, each member being provided with a continuously annular surface on one side facing away from the recess and forming a seal with the adjacent membrane, the other side of each member being provided with radial grooves extending from the inner central opening to the outer periphery thereof to provide passages for the purifying liquid and spacing elements therebetween, said grooves and spacing elements facing the bottom of the recess provided in the one side of said plate whereby purifying liquid may be passed into said transverse distributing passage then outwardly and radially through said radial passages to pass between the outer surface of one of said pairs of membranes and the adjacent plate.
Claim 2
Dependent Claim
253 words
A dialysis apparatus comprising a plurality of stacked supporting plates and a plurality of pairs of membranes, each pair of membranes being disposed between a pair of plates and in stacked relation therewith, said plates being provided with grooves facing said pairs of membrances to permit passage of a liquid to be purified between the membranes of each pair and to permit passage of a purifying liquid between the outside of each pair of membranes and the surface of the adjacent plate, said stack of plates and membranes being provided with holes therethrough forming a distributing passage extending transversely of the stack of plates and membranes for introducing a purifying liquid, annular button-like distributing members disposed in a recess provided in one side of each plate, the center opening of each annular distributing member coinciding with the transverse distributing passage, each member being provided with a continuously annular surface on one side facing away from the recess and forming a seal with the adjacent membrane, the other side of each member being provided with radial grooves extending from the inner central opening to the outer periphery thereof to provide passages for the purifying liquid and spacing elements therebetween, said grooves and spacing elements facing the bottom of the recess provided in the one side of said plate whereby purifying liquid may be passed into said transverse distributing passage then outwardly and radially through said radial passages to pass between the outer surface of one of said pairs of membranes and the adjacent plate.
Claim 3
Dependent Claim
52 words
A dialysis apparatus as claimed in claim 1 wherein an annular bead is provided on one of (a) the annular surface on the one side of said distributing member and (b) the surface of said adjacent plate surrounding said transverse distributing passage to improve the seal with the pair of membranes therebetween.
Claim 4
Dependent Claim
69 words
A dialysis apparatus as claimed in claim 1 wherein the recess in the one side of each plate has a larger diameter than the diameter of each button-like distributing member and at least two diametrically opposed spacing elements of each distributing member extend outwardly from the outer diameter of said member to engage the outer wall of the recess so as to properly position said member in said recess.
Claim 5
Dependent Claim
32 words
A dialysis apparatus as claimed in claim 1 wherein said spacing elements have a substantially triangular configuration the edges of which are rounded off to facilitate smooth flow of the purifying liquid.
References Cited (Backward Citations)
US3501011A
Cited
US3741395A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |