US3839200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dialysis apparatus
Assignee: Gambro Industries SAS
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Filing: 1972-03-15
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Granted: 1974-10-01
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Expires: 1992-03-15
Abstract
Abstract A dialysis apparatus, especially for the purification of blood, is provided which comprises: A. A FIRST DIALYSER AND A DIALYSIS MEMBRANE SEPARATING SAID DIALYSER INTO TWO COMPARTMENTS AND AN INLET AND AN OUTLET FOR THE FIRST COMPARTMENT FOR THE LIQUID TO BE TREATED; AND B. A SECOND DIALYSER AND AN IONIC MEMBRANE SEPARATING SAID SECOND DIALYSER INTO TWO COMPARTMENTS, THE FIRST COMPARTMENT OF SAID SECOND DIALYSER BEING CONNECTED WITH THE SECOND COMPARTMENT OF THE FIRST DIALYSER SO AS TO FORM A CLOSED CIRCUIT, AND THE SECOND COMPARTMENT OF THIS SECOND DIALYSER BEING EQUIPPED WITH AN INLET AND AN OUTLET FOR LIQUID.
Inventors
- 👤 C Gigou
- 👤 J Quentin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:35
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/14; A61M1/16; A61M1/1694; A61M1/1696
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
A DIALYSIS APPARATUS, ESPECIALLY FOR THE PURIFICATION OF BLOOD, WHICH CONSISTS ESSENTIALLY OF: A. FIRST DIALYSER AND A DIALYSIS MEMBRANE SEPARATING SAID DIALYSER INTO TWO COMPARTMENTS AND AN INLET AND AN OUTLET FOR THE FIRST COMPARTMENT FOR THE LIQUID TO BE TREATED; AND B. A SECOND DIALYSER AND AN IONIC MEMBRANE SEPARATING SAID SECOND DIALYSER INTO TWO COMPARTMENTS. THE FIRST COMPARTMENT OF SAID SECOND DIALYSER BEING CONNECTED WITH THE SECOND COMPARTMENT OF THE FIRST DIALYSER SO AS TO FORM A CLOSED CIRCUIT, AND THE SECOND COMPARTMENT OF THIS SECOND DIALYSER BEING EQUIPPED WITH AN INLET AND AN OUTLET FOR LIQUID, THE IONIC MEMBRANE HAVING A SELECTIVE PERMEABILITY GREATER THAN 50 PERCENT AND UREA/NACL SELECTIVELY GREATER THAN 5.
Claim 2
Dependent Claim
117 words
A DIALYSIS APPARATUS, ESPECIALLY FOR THE PURIFICATION OF BLOOD, WHICH CONSISTS ESSENTIALLY OF: A. FIRST DIALYSER AND A DIALYSIS MEMBRANE SEPARATING SAID DIALYSER INTO TWO COMPARTMENTS AND AN INLET AND AN OUTLET FOR THE FIRST COMPARTMENT FOR THE LIQUID TO BE TREATED; AND B. A SECOND DIALYSER AND AN IONIC MEMBRANE SEPARATING SAID SECOND DIALYSER INTO TWO COMPARTMENTS. THE FIRST COMPARTMENT OF SAID SECOND DIALYSER BEING CONNECTED WITH THE SECOND COMPARTMENT OF THE FIRST DIALYSER SO AS TO FORM A CLOSED CIRCUIT, AND THE SECOND COMPARTMENT OF THIS SECOND DIALYSER BEING EQUIPPED WITH AN INLET AND AN OUTLET FOR LIQUID, THE IONIC MEMBRANE HAVING A SELECTIVE PERMEABILITY GREATER THAN 50 PERCENT AND UREA/NACL SELECTIVELY GREATER THAN 5.
Claim 3
Dependent Claim
25 words
Apparatus according to claim 1 in which the ionic membrane has a selective permeability greater than 70 percent and a urea/NaCl selectively greater than 10.
Claim 4
Dependent Claim
27 words
Apparatus according to claim 1 in which the ionic membrane contains carboxylic, sulphonic, phosphonic or phosphinic acid groups or salts thereof, or sulphonium, phosphonium or ammonium groups.
Claim 5
Dependent Claim
85 words
Apparatus according to claim 1 in which the ionic membrane comprises a sulphonated styrene-divinylbenzene copolymer, a chloromethylated and quaternised styrene-divinylbenzene copolymer, a quaternised vinyl alcohol-vinylpyridine copolymer, a sulphated ethylene-vinyL alcohol copolymer, an ethylene-vinyl alcohol copolymer condensed with eipchlorohydrin and then aminated, a quaternised acrylonitrile-vinylpyridine copolymer, epichlorohydrin polycondensate obtained from polyhydroxyethers (polycondensation products of bisphenol with epichlorohydrin) by condensation with epichlorohydrin followed by amination, a sulphonated polyarylethersulphone, a sulphonated or chloromethylated and then aminated tetrafluoroethylene-styrene copolymer or an acrylonitrile methallylsulphonic acid copolymer or a salt thereof.
Claim 6
Dependent Claim
50 words
Apparatus according to claim 1 in which the dialysis membrane comprises cellulose acetate, a vinyl acetate-vinyl alcohol copolymer, a hydroxyethyl, hydroxypropyl, glycerol or glycidyl methacrylate homo- or co-polymer, a trimethyl-(2-hydroxy-3-methacryloyloxypropyl)ammonium chloride homo- or co-polymer, polyvinylpyrrolidone, amylose or an acrylonitrile/unsaturated monomer containing a sulphonic acid, amine or quaternary ammonium group copolymer.
Claim 7
Dependent Claim
33 words
Apparatus according to claim 1 in which a device for the removal of blood waste products, especially urea is connected to the inlet and outlet from the second compartment of the second dialyser.
Claim 8
Dependent Claim
17 words
Apparatus according to claim 6 in which the device is an activated charcoal or ion-exchange resin column.
Claim 9
Dependent Claim
83 words
In a process for the continuous regeneration of the dialysis bath coming from a haemodialyser the improvement which consists essentially of passing the bath in closed circuit from the haemodialyser through an auxiliary dialyser equipped with an ionic membrane having a selective permeability greater than 50 percent and a urea/NaCl selectivity greater than 5, the second compartment of the auxiliary dialyser being traversed by a purifying liquid which has an osmotic pressure lower than or equal to the osmotic pressure of the bath.
Claim 10
Dependent Claim
83 words
In a process for the continuous regeneration of the dialysis bath coming from a haemodialyser the improvement which consists essentially of passing the bath in closed circuit from the haemodialyser through an auxiliary dialyser equipped with an ionic membrane having a selective permeability greater than 50 percent and a urea/NaCl selectivity greater than 5, the second compartment of the auxiliary dialyser being traversed by a purifying liquid which has an osmotic pressure lower than or equal to the osmotic pressure of the bath.
Claim 11
Dependent Claim
17 words
Process according to claim 8 in which the purifying liquid is water or an aqueous sugar solution.
Claim 12
Dependent Claim
12 words
A dialysis bath regenerated by a process as defined in claim 8.
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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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |