US4464337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dialysis processing of preserved living cells and cell components
Assignee: Rensselaer Polytechnic Institute
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Filing: 1983-06-27
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Granted: 1984-08-07
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Expires: 2003-06-27
Abstract
Abstract A method and apparatus of processing biological fluids by adding or removing preservatives or simply removing water comprises providing a bag of semi-permeable membrane which contains the biological fluid and bathing the bag with dialysate having controlled osmolality. The preservative or water can thus be removed or added to the bag directly through the semi-permeable membrane by controlling the osmolality of the dialysate without exposing the biological fluid to contaminants. In the case of whole or components of blood, the blood or blood components can be collected in the bag, processed for preservation, and prepared for use then administered, all in the same bag.
Inventors
- 👤 Allen Zelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:12
CPC Classifications
A; A61; A61J; A61J1/00; A61J1/14; A61J1/20; A01; A01N; A01N1/00; A01N1/10; A01N1/12; A01N1/122; A01N1/125; A61L; A61L33/00; A61L33/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
150 words
A method of preserving a specimen of blood or blood components containing water and living cells comprising: providing a sealed bag, for containing one unit of the specimen, made of semi-permeable membrane which is permeable to a preservative and has at least one port for entry of the specimen collecting the specimen in the sealed bag of semi-permeable membrane through the port; sealing the port so that the bag can be handled and stored as a portable unit of the specimen; supplying a dialysate, including glycerine as the preservative, over the bag to draw water out of the bag through the permeable membrane, whereby the specimen is dehydrated and preserved by glycerolization; the preservative containing highly dehydrated, deoxygenated glycerol with anti-oxidant whereby the cells are dehydrated, deoxygenated and ready for storage in the bag; and storing the bag with the contained specimen and preservative as a unit of the specimen.
Claim 2
Independent Claim
150 words
A method of preserving a specimen of blood or blood components containing water and living cells comprising: providing a sealed bag, for containing one unit of the specimen, made of semi-permeable membrane which is permeable to a preservative and has at least one port for entry of the specimen collecting the specimen in the sealed bag of semi-permeable membrane through the port; sealing the port so that the bag can be handled and stored as a portable unit of the specimen; supplying a dialysate, including glycerine as the preservative, over the bag to draw water out of the bag through the permeable membrane, whereby the specimen is dehydrated and preserved by glycerolization; the preservative containing highly dehydrated, deoxygenated glycerol with anti-oxidant whereby the cells are dehydrated, deoxygenated and ready for storage in the bag; and storing the bag with the contained specimen and preservative as a unit of the specimen.
Claim 3
Dependent Claim
29 words
A method according to claim 1, wherein the sealed bag comprises a sleeve of semi-permeable membrane heat-sealed at spaced locations to form a volume therebetween for containing the specimen.
Claim 4
Independent Claim
194 words
A method of adding a preservative of a biological specimen comprising: providing a sealed bag having a semi-permeable wall which is permeable to the preservative and has at least one port for entry of the specimen; supplying the specimen to the bag through the port; sealing the port so that the bag with the contained specimen is transportable for storage and handling as a unit of the specimen; positioning the bag with its contained specimen in a transport cell; supplying a dialysate which includes the preservative, over an outer surface of the bag wall in the cell, the dialysate having an initial osmoality similar to the osmoality of the contents of the bag to cause preservative to enter the bag through the semi-permeable wall; agitating the specimen in the bag to reduce a boundary layer adjacent its wall; increasing the osmoality of the dialysate supplied over the bag surface to control the flow of preservative in the bag as the concentration of preservative in the bag increases; removing the bag from the transport cell with its contained specimen to which preservative has been added; and storing the bag as a unit of the specimen.
Claim 5
Independent Claim
194 words
A method of adding a preservative of a biological specimen comprising: providing a sealed bag having a semi-permeable wall which is permeable to the preservative and has at least one port for entry of the specimen; supplying the specimen to the bag through the port; sealing the port so that the bag with the contained specimen is transportable for storage and handling as a unit of the specimen; positioning the bag with its contained specimen in a transport cell; supplying a dialysate which includes the preservative, over an outer surface of the bag wall in the cell, the dialysate having an initial osmoality similar to the osmoality of the contents of the bag to cause preservative to enter the bag through the semi-permeable wall; agitating the specimen in the bag to reduce a boundary layer adjacent its wall; increasing the osmoality of the dialysate supplied over the bag surface to control the flow of preservative in the bag as the concentration of preservative in the bag increases; removing the bag from the transport cell with its contained specimen to which preservative has been added; and storing the bag as a unit of the specimen.
Claim 6
Dependent Claim
36 words
A method according to claim 3, wherein the specimen comprises packed cells, the sealed bag being made of a sleeve of semi-permeable material heat-sealed at spaced locations to form a volume therebetween for containing the specimen.
Claim 7
Dependent Claim
29 words
A method according to claim 3, wherein the sealed bag comprises a sleeve of semi-permeable material heat-sealed at spaced locations to form a volume therebetween for containing the specimen.
Claim 8
Dependent Claim
114 words
A method according to claim 3, including again positioning the bag with its contained specimen to which preservative has been added within a transport cell, after the bag has been stored as a unit of the specimen; supplying a second dialysate over a surface of the bag, the second dialysate having an initial relatively high osmoality of the preservative which has been added to the bag; again agitating the specimen in the bag to reduce a boundary layer adjacent the wall; and decreasing the osmoality of the second dialysate supplied over the bag surface to control the flow of preservative out of the bag as the concentration of the preservative in the bag decreases.
Claim 9
Dependent Claim
28 words
A method according to claim 3, wherein the step of supplying the specimen to the bag comprises a step of initially collecting the specimen from a natural source.
Claim 10
Dependent Claim
12 words
A method according to claim 7, wherein the specimen comprises whole blood.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-07 | 1988-02-06 | 1988-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-07 | 1992-02-06 | 1992-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-07 | 1996-02-06 | 1996-08-07 | $7700.00 | Window Closed / Lapsed |