US3796313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dialyser apparatus
Assignee: Sandoz AG
•
Filing: 1972-12-15
•
Granted: 1974-03-12
•
Expires: 1992-12-15
Abstract
Abstract A dialysis unit particularly suited to extra-corporeal haemodialysis having at least two dialysis membrane envelopes in overlapping relationship disposed in an enclosure. The envelopes constitute discrete flow passages for liquid to be dialysed and define with the enclosure a dialysate flow passage of sinuous configuration.
Inventors
- 👤 L Bigt
- 👤 L Luppi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:26
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/08; B01D63/089; B01D61/00; B01D61/24; B01D61/28
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
115 words
A dialysis unit which comprises an hermetically sealed laminar enclosure, at least two dialysis membrane envelopes in overlapping relationship disposed in the enclosure, each envelope constituting a discrete flow passage for liquid to be dialysed, each envelope being rigidly secured over all but one of the edges thereof to the enclosure, the free edges of consecutive envelopes being in spaced apart relationship with respect to alternate sides of the enclosure, to define a continuous dialysate flow passage, between the enclosure and the envelopes, of sinuous configuration, inlets and outlets being provided for the envelopes and the dialysate flow passage so arranged as to cause cross flow of dialysate with respect to liquid to be dialysed.
Claim 2
Dependent Claim
115 words
A dialysis unit which comprises an hermetically sealed laminar enclosure, at least two dialysis membrane envelopes in overlapping relationship disposed in the enclosure, each envelope constituting a discrete flow passage for liquid to be dialysed, each envelope being rigidly secured over all but one of the edges thereof to the enclosure, the free edges of consecutive envelopes being in spaced apart relationship with respect to alternate sides of the enclosure, to define a continuous dialysate flow passage, between the enclosure and the envelopes, of sinuous configuration, inlets and outlets being provided for the envelopes and the dialysate flow passage so arranged as to cause cross flow of dialysate with respect to liquid to be dialysed.
Claim 3
Dependent Claim
70 words
The dialysis unit of claim 1, wherein the enclosure comprises two walls hermetically joined over the margins thereof and each envelope comprises a symmetrically folded sheet of dialysis membrane, the folded edge being the free edge and the unfolded overlapping edges being rigidly secured to the enclosure by interposition thereof between the margins of the walls of the enclosure, such interposition effecting a hermetic seal of the envelope so formed.
Claim 4
Dependent Claim
31 words
The dialysis unit of claim 2, wherein said margins of the walls are provided with discrete sealing means to effect hermetic sealing between the margins of the walls and the envelopes.
Claim 5
Dependent Claim
34 words
The dialysis unit of claim 3, wherein said discrete sealing means comprises a pair of cooperating endless loops of resilient material each disposed in an endless groove extending around the margin of each wall.
Claim 6
Dependent Claim
22 words
The dialysis unit of claim 1, having terminal spacer means between the terminal envelopes and the enclosure, to facilitate dialysate flow therebetween.
Claim 7
Dependent Claim
24 words
The dialysis unit of claim 5, wherein said terminal spacer means comprises an array of conical projections contacting the envelopes at the tips thereof.
Claim 8
Dependent Claim
17 words
The dialysis unit of claim 6, wherein the conical projections of the array are symmetrically relatively disposed.
Claim 9
Dependent Claim
30 words
The dialysis unit of claim 7, wherein the conical projections of the array are so disposed as to define therebetween two, mutually perpendicularly extending, series of linear, parallel, unimpeded grooves.
Claim 10
Dependent Claim
26 words
The dialysis unit of claim 8, wherein one series of grooves is disposed in the direction of flow of liquid to be dialysed through the envelope.
Claim 11
Dependent Claim
17 words
The dialysis unit of claim 5, wherein the terminal spacer means are formed integrally with the enclosure.
Claim 12
Dependent Claim
23 words
The dialysis unit of claim 1, wherein intermediate spacer means are provided between overlapping portions of the envelopes, to facilitate diaylsis flow therebetween.
Claim 13
Dependent Claim
31 words
The dialysis unit of claim 11, wherein said intermediate spacer means comprises a network structure consisting of two series of parallel and spaced apart filaments, one series crossing the other series.
Claim 14
Dependent Claim
20 words
The dialysis unit of claim 12, wherein the network structure is non-woven, the two series of filaments being bonded together.
Claim 15
Dependent Claim
22 words
The dialysis unit of claim 13, wherein the one series of filaments cross the other series of filaments at an acute angle.
Claim 16
Dependent Claim
31 words
The dialysis unit of claim 14, wherein each series of filaments extend at an equal and opposite angle to the direction of flow of liquid to be dialysed in the envelopes.
Claim 17
Dependent Claim
42 words
The dialysis unit of claim 12, wherein the intermediate spacer means consists of a spacer assembly, the network structure being sandwiched between two outer nets, each outer net consisting of woven filaments, and being of substantially finer mesh than the sandwiched network.
Claim 18
Dependent Claim
18 words
The dialysis unit of claim 16, wherein the outer nets are of plain weave and of square mesh.
Claim 19
Dependent Claim
29 words
The dialysis unit of claim 16, wherein the warp filaments of the outer nets are disposed in the direction of flow of liquid to be dialysed through the envelopes.
Claim 20
Dependent Claim
42 words
The dialysis unit of claim 1, wherein the inlet and outlet of the dialysate flow passage comprise a distribution pipe and collection pipe respectively, each pipe extending substantially across a side of the enclosure and being perforated evenly over the length thereof.
Claim 21
Dependent Claim
77 words
The dialysis unit of claim 1, wherein the inlet and outlet for the liquid to be dialysed each comprises a port having a tubular neck, a nipple portion at one end and a flattened head portion at the other end, the flattened bore being provided in the flattened head portion that is gradually flared towards the end of the port, the flattened head portion being disposed within the envelope and being hermetically sealed therein at the neck.
Claim 22
Dependent Claim
15 words
The dialysis unit of claim 1, wherein the enclosure is substantially of two-dimensionally flat form.
Claim 23
Dependent Claim
20 words
The dialysis unit of claim 21, having an interior peripheral zone of the enclosure tapered substantially to a peripheral edge.
Claim 24
Dependent Claim
25 words
The dialysis unit of claim 22, wherein said peripheral zone of the enclosure is corrugated, the lines of corrugation running normal to said peripheral edge.
References Cited (Backward Citations)
US3362540A
Cited
US3488690A
Cited
US3537588A
Cited
US3616930A
Cited
US3547271A
Cited
US3627137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |