METHOD FOR EMBOLIZATION USING LIQUID EMBOLIC MATERIALS
First Claim
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1. A method for embolization in a mammal comprising the steps of:
- a) premixing(i) a first aqueous solution or dispersion comprising at least one oxidized polysaccharide containing aldehyde groups, having a weight-average molecular weight of about 1,000 to about 1,000,000 Daltons, said at least one oxidized polysaccharide having an equivalent weight per aldehyde group of about 90 to about 1500 Daltons, said solution or dispersion containing about 5% to about 40% by weight of said at least one oxidized polysaccharide; and
ii) a second aqueous solution or dispersion comprising at least one water-dispersible, multi-arm amine wherein at least three of the arms are terminated by a primary amine group, wherein said at least one multi-arm amine has a number-average molecular weight of about 450 to about 200,000 Daltons, said solution or dispersion containing about 5% to about 70% by weight of said at least one multi-arm amine;
or(iii) a water-dispersible, multi-arm amine in the form of a neat liquid wherein at least three of the arms are terminated by a primary amine group, wherein said at least one multi-arm amine has a number-average molecular weight of about 450 to about 200,000 Daltons;
to form a mixture; and
b) introducing said mixture into the vasculature of the mammal before said mixture completely cures.
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Abstract
A method for embolization using liquid embolic materials is described. The method comprises the use of two liquid components. The first liquid component is an aqueous solution or dispersion comprising at least one oxidized polysaccharide. The second liquid component is either an aqueous solution or dispersion comprising at least one water-dispersible, multi-arm amine, or a water-dispersible multi-arm amine in the form of a neat liquid. The two components crosslink in situ to form a hydrogel that should act as an effective embolic agent.
74 Citations
30 Claims
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1. A method for embolization in a mammal comprising the steps of:
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a) premixing (i) a first aqueous solution or dispersion comprising at least one oxidized polysaccharide containing aldehyde groups, having a weight-average molecular weight of about 1,000 to about 1,000,000 Daltons, said at least one oxidized polysaccharide having an equivalent weight per aldehyde group of about 90 to about 1500 Daltons, said solution or dispersion containing about 5% to about 40% by weight of said at least one oxidized polysaccharide; and ii) a second aqueous solution or dispersion comprising at least one water-dispersible, multi-arm amine wherein at least three of the arms are terminated by a primary amine group, wherein said at least one multi-arm amine has a number-average molecular weight of about 450 to about 200,000 Daltons, said solution or dispersion containing about 5% to about 70% by weight of said at least one multi-arm amine;
or(iii) a water-dispersible, multi-arm amine in the form of a neat liquid wherein at least three of the arms are terminated by a primary amine group, wherein said at least one multi-arm amine has a number-average molecular weight of about 450 to about 200,000 Daltons; to form a mixture; and b) introducing said mixture into the vasculature of the mammal before said mixture completely cures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for embolization in a mammal comprising the step of:
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introducing into the vasculature of said mammal; i) a first aqueous solution or dispersion comprising at least one oxidized polysaccharide containing aldehyde groups, having a weight-average molecular weight of about 1,000 to about 1,000,000 Daltons, said at least one oxidized polysaccharide having an equivalent weight per aldehyde group of about 90 to about 1500 Daltons, said solution or dispersion containing about 5% to about 40% by weight of said at least one oxidized polysaccharide; and (ii) a second aqueous solution or dispersion comprising at least one water-dispersible, multi-arm amine wherein at least three of the arms are terminated by a primary amine group, wherein said at least one multi-arm amine has a number-average molecular weight of about 450 to about 200,000 Daltons, said solution or dispersion containing about 5% to about 70% by weight of said at least one multi-arm amine;
or(iii) a water-dispersible, multi-arm amine in the form of a neat liquid wherein at least three of the arms are terminated by a primary amine group, wherein said at least one multi-arm amine has a number-average molecular weight of about 450 to about 200,000 Daltons; wherein (i) and (ii) or (iii) react to form a hydrogel - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification