Biocompatible cellulose dialysis membrane with increased adsorption of beta-2-microglobulin
First Claim
1. A dialysis membrane for hemodialysis in the form of flat films, tubular films or hollow filaments, composed of substitution-modified cellulose, wherein the modified cellulose has a molecular structure which substantially adsorbs beta- 2-microglobulin present in blood plasma and is effective to reduce carpal tunnel syndrome and is represented by the formula ##STR3## wherein:
- Cell is a framework of an unmodified cellulose molecule or of a chitin molecule, in each case without hydroxyl groups;
A is selected from the group consisting of and Z-B;
Z is an atom of group V or VI or the Periodic System other than oxygen;
In the case where Z is an atom of group V, A is and T is a hydrogen atom or (X-Y);
in the case where Z is an atom of group VI, A is(n+s) is the mean degree of substitution;
0<
n<
m and 0≦
s<
m and n+s<
m;
m=3 in the case of the unmodified cellulose molecule and m=2 in the case of the chitin molecule;
B is selected from the group consisting of Y and X-Y;
--X-- and --X'"'"'-- are each at least one member selected from the group consisting of a substituted or unsubstituted, straight or branched chain alkylene, alkenylene or alkynylene radical in which the carbon chain may be interrupted by hetero atoms or be CO--, CONR-- or COO--groups, a substituted or unsubstituted cycloalkylene which may contain hetero atoms, a substituted or unsubstituted arylene, arylalkylene, arylalkenylene or arylalkynlene radical which may contain hetero atoms, a substituted or unsubstituted bisarylalkylene or bisarylene radical, a substituted bisarylalkylene or bisarylene radical of a condensed aromatic compound, and a substituted or unsubstituted readical of a heterocylic compound;
--Y and --Y'"'"' are each at least one member selected from the group consisting of --H, --NR2 --N+ R3, --COOH or a salt thereof, --COOR, --CONR2, --CO--R, --CS--R, --CSOH or a salt thereof, --CSOR, --CSNR2, --SO3 H or a salt thereof, --SO3 R, --SO2 R, --SO2 NR2, --SR, --SOR, --SON R2, --PO3 H2 or a salt thereof, --PO(OR)2, --PO2 H(NR2), --PO(NR2)2, --PO2 H2, --POH(OR), --CN, --NO2, --OR, halogen and Si(OR)3 ;
R is at least one member selected from the group consisting of a hydrogen atom, a straight or branched chain alkyl, alkenyl or alkynyl group having 1 to 36 atoms in which the carbon chain may be interrupted by hetero atoms or by CO--, CONR-- or COO-- groups, a substituted or unsubstituted cycloalkyl group which may contain hetero atoms, a substituted or unsubstituted aryl, arylalkyl, arylalkenyl or arylalkynyl radical which may contain hetero atoms, a substituted or unsubstituted bisarylalkyl or bisaryl radical, a substituted or unsubstituted radical or a condensed aromatic compound, and a substituted or unsubstituted radical of a heterocyclic compound;
X is identical to or different from X'"'"' and Y is identical to or different from Y'"'"'.
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Accused Products
Abstract
A dialysis membrane for hemodialysis with improved biocompatibility is composed of a modified cellulose which has a structure represented by the formula ##STR1## Cell is the framework of the unmodified cellulose molecule or of the chitin molecule, in each case without hydroxyl groups. Z is an atom of group V or VI (except oxygen) of the periodic system. Where Z is an atom of group V, T is a hydrogen atom or (X-Y). Where Z is an atom of group VI, T is omitted. (n+s) indicates the mean degree of substitution with 0<n<m and 0≦s<m and n+s<m. m=3 in the case of the unmodified cellulose molecule and m=2 in the case of the chitin molecule. -X- can be omitted as desired or -X- and -X'"'"'- denote specific divalent groups. -Y and -Y'"'"' denote -H and/or specified univalent radicals. X is identical to or different from X'"'"' and Y is identical to or different from Y'"'"'.
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Citations
11 Claims
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1. A dialysis membrane for hemodialysis in the form of flat films, tubular films or hollow filaments, composed of substitution-modified cellulose, wherein the modified cellulose has a molecular structure which substantially adsorbs beta- 2-microglobulin present in blood plasma and is effective to reduce carpal tunnel syndrome and is represented by the formula ##STR3## wherein:
- Cell is a framework of an unmodified cellulose molecule or of a chitin molecule, in each case without hydroxyl groups;
A is selected from the group consisting of and Z-B; Z is an atom of group V or VI or the Periodic System other than oxygen; In the case where Z is an atom of group V, A is and T is a hydrogen atom or (X-Y);
in the case where Z is an atom of group VI, A is(n+s) is the mean degree of substitution;
0<
n<
m and 0≦
s<
m and n+s<
m;m=3 in the case of the unmodified cellulose molecule and m=2 in the case of the chitin molecule; B is selected from the group consisting of Y and X-Y; --X-- and --X'"'"'-- are each at least one member selected from the group consisting of a substituted or unsubstituted, straight or branched chain alkylene, alkenylene or alkynylene radical in which the carbon chain may be interrupted by hetero atoms or be CO--, CONR-- or COO--groups, a substituted or unsubstituted cycloalkylene which may contain hetero atoms, a substituted or unsubstituted arylene, arylalkylene, arylalkenylene or arylalkynlene radical which may contain hetero atoms, a substituted or unsubstituted bisarylalkylene or bisarylene radical, a substituted bisarylalkylene or bisarylene radical of a condensed aromatic compound, and a substituted or unsubstituted readical of a heterocylic compound; --Y and --Y'"'"' are each at least one member selected from the group consisting of --H, --NR2 --N+ R3, --COOH or a salt thereof, --COOR, --CONR2, --CO--R, --CS--R, --CSOH or a salt thereof, --CSOR, --CSNR2, --SO3 H or a salt thereof, --SO3 R, --SO2 R, --SO2 NR2, --SR, --SOR, --SON R2, --PO3 H2 or a salt thereof, --PO(OR)2, --PO2 H(NR2), --PO(NR2)2, --PO2 H2, --POH(OR), --CN, --NO2, --OR, halogen and Si(OR)3 ; R is at least one member selected from the group consisting of a hydrogen atom, a straight or branched chain alkyl, alkenyl or alkynyl group having 1 to 36 atoms in which the carbon chain may be interrupted by hetero atoms or by CO--, CONR-- or COO-- groups, a substituted or unsubstituted cycloalkyl group which may contain hetero atoms, a substituted or unsubstituted aryl, arylalkyl, arylalkenyl or arylalkynyl radical which may contain hetero atoms, a substituted or unsubstituted bisarylalkyl or bisaryl radical, a substituted or unsubstituted radical or a condensed aromatic compound, and a substituted or unsubstituted radical of a heterocyclic compound; X is identical to or different from X'"'"' and Y is identical to or different from Y'"'"'. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- Cell is a framework of an unmodified cellulose molecule or of a chitin molecule, in each case without hydroxyl groups;
Specification