US4421684A
Expired / Lapsed
US
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Column for adsorption of blood proteins
Assignee: Kuraray Co Ltd
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Filing: 1982-05-28
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Granted: 1983-12-20
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Expires: 2002-05-28
Abstract
Abstract A column for adsorption of blood proteins is disclosed which comprises a blood inlet and a blood outlet each with a filter, and a porous material packed between both the filters, which material has a mean pore diameter (D) of 30-3,000 amgstroms with the volume occupied by pores with diameters of 0.8D-1.2D being at least 80% of the whole pore volume. The adsorption column can eliminate specific blood proteins by selective adsorption and is useful in the treatment of autoimmune diseases and cancer, for instance.
Inventors
- 👤 Toshihide Nakashima
- 👤 Maso Tanihara
- 👤 Koichi Takakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:11
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/36; A61M1/3679; B; B01; B01D; B01D15/00; B01D15/08; B01J; B01J20/00; B01J20/22; B01J20/26; B01J20/261; B01J20/264; B01J20/28; B01J20/28054; B01J20/28057; B01J20/28069; B01J20/28078; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3214; B01J20/3217; B01J20/3219; B01J20/3231; B01J20/3242; B01J20/3244; B01J20/3246; B01J20/3257; B01J20/3268; B01J20/327; B01J20/3276; B01J2220/00; B01J2220/50; B01J2220/58; Y; Y10; Y10S; Y10S530/00; Y10S530/827; Y10S530/829; Y10S530/83; Y10S530/868
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
164 words
A method of removing blood proteins by adsorption which comprises bringing blood, plasma or serum into contact with porous glass having a mean pore diameter in the range of 30-3,000 angstroms with the ratio of the volume occupied by pores with diameters within the range of 0.8D-1.2D to the whole pore volume being at least 80%, D being the mean pore diameter, and with the mean pore diameter of the porous glass being selected to correspond to the molecular weights of the proteins to be adsorbed as follows: (a) for adsorption of proteins having molecular weights of 500-20,000, porous glass with a mean pore diameter in the range of 30-150 angstroms is used; (b) for adsorption of proteins having molecular weights of 20,000-200,000, porous glass with a mean pore diameter in the range of 150-1,000 angstroms is used; and (c) for adsorption of proteins having molecular weights of 200,000-1,000,000, porous glass with a mean pore diameter in the range of 1,000-3,000 angstroms is used.
Claim 2
Independent Claim
164 words
A method of removing blood proteins by adsorption which comprises bringing blood, plasma or serum into contact with porous glass having a mean pore diameter in the range of 30-3,000 angstroms with the ratio of the volume occupied by pores with diameters within the range of 0.8D-1.2D to the whole pore volume being at least 80%, D being the mean pore diameter, and with the mean pore diameter of the porous glass being selected to correspond to the molecular weights of the proteins to be adsorbed as follows: (a) for adsorption of proteins having molecular weights of 500-20,000, porous glass with a mean pore diameter in the range of 30-150 angstroms is used; (b) for adsorption of proteins having molecular weights of 20,000-200,000, porous glass with a mean pore diameter in the range of 150-1,000 angstroms is used; and (c) for adsorption of proteins having molecular weights of 200,000-1,000,000, porous glass with a mean pore diameter in the range of 1,000-3,000 angstroms is used.
Claim 3
Dependent Claim
36 words
A method of removing blood proteins by adsorption as claimed in claim 1, wherein the mean pore diameter of the porous glass is within the range of 350-900 angstroms so that γ-globulin can be adsorbed thereon.
Claim 4
Independent Claim
28 words
A method of removing blood proteins by adsorption as claimed in any one of claims 1 or 2, wherein the porous glass is coated with a hydrophilic polymer.
Claim 5
Dependent Claim
50 words
A method of removing blood proteins by adsorption as claimed in claim 3, wherein the hydrophilic polymer is selected from the group consisting of polymers based on acrylic acid esters, polymers based on methacrylic acid esters, polymers based on acrylamide, polymers based on vinyl alcohol, polyvinylpyrrolidone, cellulose nitrate and gelatin.
Claim 6
Dependent Claim
28 words
A method of removing blood proteins by adsorption as claimed in claim 3, wherein the hydrophilic polymer is a polymer based on an acrylic or methacrylic acid ester.
Claim 7
Dependent Claim
33 words
A method of removing blood proteins by adsorption as claimed in claim 3, wherein the hydrophilic polymer is an acrylic or methacrylic acid-based polymer in which an epoxy group-containing polymerizable monomer is copolymerized.
Claim 8
Independent Claim
28 words
A method of removing blood proteins by adsorption as claimed in any one of claims 1 or 2, wherein the surface of the porous glass is negatively charged.
Claim 9
Independent Claim
31 words
A method of removing blood proteins by adsorption as claimed in any one of claims 1 or 2, wherein the porous glass carries carboxyl or sulfo groups on the surface thereof.
Claim 10
Independent Claim
29 words
A method of removing blood proteins by adsorption as claimed in any one of claims 1 or 2, wherein the porous glass carries silanol groups on the surface thereof.
Claim 11
Independent Claim
37 words
A method of removing blood proteins by adsorption as claimed in any one of claims 1 or 2, wherein the porous glass is produced by acid treatment of alkali borosilicate glass having a fine phase separation structure.
Claim 12
Independent Claim
33 words
A method of removing blood proteins by adsorption as claimed in any one of claims 1 or 2, wherein the specific pore volume of the porous glass is not less than 0.5 cc/g.
Claim 13
Independent Claim
34 words
A method of removing blood proteins by adsorption as claimed in any one of claims 1 or 2, wherein the specific pore volume of the porous glass is within the range of 0.5-2 cc/g.
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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) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |