Hydrolytically-and proteolytically-stable polycarbonate polyurethane silicone copolymers
First Claim
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1. A biodurable polycarbonate polyurethane block copolymer comprising(a) a polycarbonate glycol internal segment;
- (b) a polyurethane internal segment;
(c) a polydialkylsiloxane internal segment;
(d) di(C1-6 alkyl)amino or C1-6 hydroxyalkyl terminating segments;
(e) cyclo(C5-7 alkane)diamino internal segments; and
(f) C2-4 alkylene diamino internal segments;
wherein said segments are linked by urethane, urea, and C--Si--C moieties, said block copolymer being devoid of hydrolytically unstable Si--O--C linkages and being substantially devoid of ether linkages.
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Abstract
A biocompatible, biodurable polycarbonate polyurethane with internal polysiloxane segments and devices made therefrom.
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Citations
35 Claims
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1. A biodurable polycarbonate polyurethane block copolymer comprising
(a) a polycarbonate glycol internal segment; -
(b) a polyurethane internal segment; (c) a polydialkylsiloxane internal segment; (d) di(C1-6 alkyl)amino or C1-6 hydroxyalkyl terminating segments; (e) cyclo(C5-7 alkane)diamino internal segments; and (f) C2-4 alkylene diamino internal segments; wherein said segments are linked by urethane, urea, and C--Si--C moieties, said block copolymer being devoid of hydrolytically unstable Si--O--C linkages and being substantially devoid of ether linkages.
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2. A biodurable polycarbonate polyurethane block copolymer, obtained from reactants comprising
(a) an aromatic or aliphatic diisocyanate; -
(b) a polycarbonate diol; (c) a difunctional polydialkylsiloxane having a viscosity between 15 and 70 centistokes; (d) two chain extenders independently selected from C2-8 diamines and C2-8 diols, wherein said diamines and diols are cyclic, straight chain, or branched, and at least one chain extender is cyclic or branched; and (e) a C2-6 alkanol or di(C2-6 alkyl) amine chain terminator, or mixture thereof; wherein said block copolymer is devoid of hydrolytically unstable Si--O--C linkages and substantially devoid of ether linkages. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A vascular graft comprising a graft wall base including at least 85% by weight a biodurable polycarbonate polyurethane block copolymer comprising
(a) a polycarbonate glycol internal segment; -
(b) a polyurethane internal segment; (c) a polydialkylsiloxane internal segment; (d) di(C1-6 alkyl)amino or C1-6 hydroxyalkyl terminating segments; (e) cyclo(C5-7 alkane)diamino or cyclo(C5-7 alkane)dihydroxy internal segments; and (f) C2-8 alkylene diamino or dihydroxy internal segments; wherein said segments are linked by urethane, urea, and C--Si--C moieties, said block copolymer being devoid of hydrolytically unstable Si--O--C linkages and being substantially devoid of ether linkages; said graft wall being an anisotropically microporous single layer with a porosity between 60% and 80% void/volume.
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35. A method of making a vascular graft, said method comprising
(a) obtaining a polymer solution comprising a polar solvent; -
a water soluble filler, 10% to 60% by weight; a surfactant 1% to 10% by weight; and a polycarbonate polyurethane block copolymer obtained from reactants comprising (i) an aromatic or aliphatic diisocyanate; (ii) a polycarbonate diol; (iii) a difunctional polydialkylsiloxane or polydi(fluoroalkyl)siloxane having a viscosity between 15 and 70 centistokes; (iv) two chain extenders independently selected from C2-7 diamines and C2-8 diols, wherein said diamines and diols are cyclic, straight chain, or branched, and at least one chain extender is cyclic or branched; and (v) a C2-6 alkanol or di(C2-6 alkyl) amine chain terminator, or mixture thereof; wherein said block copolymer is devoid of hydrolytically unstable Si--O--C linkages and substantially devoid of ether linkages; (b) contacting said polymer solution with a mandrel surface; (c) synchronously rotating said mandrel and an extrusion head; (d) drawing said mandrel through an extrusion head into a coagulant maintained at a temperature less than 55 degrees Centigrade (preferably 40 degrees Centigrade); and
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Specification