Multiblock biodegradable hydrogels for drug delivery and tissue treatment
First Claim
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1. A macromer which is capable of forming a gel, the macromer comprising a total of five or ten covalently linked polymeric blocks, wherein:
- a) at least one polymer block is hydrophilic and each hydrophilic polymer block individually has a water solubility of at least 1 gram/liter;
b) at least two blocks are sufficiently hydrophobic to cause the macromer to aggregate to form micelles in an aqueous continuous phase;
c) the macromer comprises at least one crosslinkable group;
d) the macromer comprises at least one thermally sensitive region; and
e) a solution of the macromer is capable of gelling or crosslinking to produce a hydrogel with a temperature dependent volume.
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Abstract
Gel-forming macromers including at least four polymeric blocks, at least two of which are hydrophobic and at least one of which is hydrophilic, and including a crosslinkable group are provided. The macromers can be covalently crosslinked to form a gel on a tissue surface in vivo. The gels formed from the macromers have a combination of properties including thermosensitivity and lipophilicity, and are useful in a variety of medical applications including drug delivery and tissue coating.
373 Citations
28 Claims
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1. A macromer which is capable of forming a gel, the macromer comprising a total of five or ten covalently linked polymeric blocks, wherein:
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a) at least one polymer block is hydrophilic and each hydrophilic polymer block individually has a water solubility of at least 1 gram/liter;
b) at least two blocks are sufficiently hydrophobic to cause the macromer to aggregate to form micelles in an aqueous continuous phase;
c) the macromer comprises at least one crosslinkable group;
d) the macromer comprises at least one thermally sensitive region; and
e) a solution of the macromer is capable of gelling or crosslinking to produce a hydrogel with a temperature dependent volume. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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3. A macromer which is capable of forming a gel, the macromer comprising at least four covalently linked polymeric blocks, wherein:
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a) at least one polymer block is hydrophilic and each hydrophilic polymer block individually has a water solubility of at least 1 gram/liter;
b) at least two blocks are sufficiently hydrophobic to cause the macromer to aggegate to form micelles in an aqueous continuous phase;
c) the macromer comprises at least one crosslinkable group;
d) the macromer comprises at least one thermally sensitive region;
e) a solution of the macromer is capable of gelling or crosslinking to produce a hydrogel with a temperature dependent volume; and
f) at least one hydrophobic block is separated from any crosslinkable group by at least one hydrophilic block.
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4. A macromer which is capable of forming a gel, the macromer comprising at least four covalently linked polymeric blocks, wherein:
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a) at least one polymer block is hydrophilic and each hydrophilic polymer block individually has a water solubility of at least 1 gram/liter;
b) at least two blocks are sufficiently hydrophobic to cause the macromer to aggregate to form micelles in an aqueous continuous phase;
c) the macromer comprises at least one crosslinkable group;
d) the macromer comprises at least one thermally sensitive region;
e) a solution of the macromer is capable of gelling or crosslinking to produce a hydrogel with a temperature dependent volume; and
f) the macromer comprises at least two chemically distinct hydrophobic blocks.
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27. A macromer which is capable of forming a gel, the macromer comprising at least four covalently linked polymeric blocks, wherein:
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a) at least one polymer block is hydrophilic and each hydrophlilc polymer block individually has a water solubility of at least 1 gram/liter;
b) at least two blocks are sufficiently hydrophobic to cause the macromer to aggregate to form micelles in an aqueous continuous phase;
c) the macromer comprises at least one crosslinkable group;
d) the macromer comprises at least one thermally sensitive region;
e) a solution of the macromer is capable of gelling or crosslinking to produce a hydrogel with a temperature dependent volume; and
f) the thermally sensitive region comprises a poloxamer backbone extended with oligolactate moities, wherein the poloxamer-lactate copolymer is terminated by acrylate moieties.
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28. A macromer which is capable of forming a gel, the macromer comprising at least four covalently linked polymeric blocks, wherein:
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a) at least one polymer block is hydrophilic and each hydrophilic polymer block individually has a water solubility of at least 1 gram/liter;
b) at least two blocks are sufficiently hydrophobic to cause the macromer to aggregate to form micelles in an aqueous continuous phase;
c) the macromer comprises at least one crosslinkable group;
d) the macromer comprises at least one thermally sensitive region;
e) a solution of the macromer is capable of gelling or crosslinking to produce a hydrogel with a temperature dependent volume; and
f) the thermally sensitive region comprises an acrylate capped polyglycolide derivatized poloxamer of about 30% polypropylene oxide content.
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Specification