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Compositions are disclosed that afford drug delivery from two-part polymer compositions that rapidly form covalent linkages when mixed together. Such compositions are particularly well suited for use in a variety of tissue related applications when rapid adhesion to the tissue and gel formation is d

Compositions are disclosed that afford drug delivery from two-part polymer compositions that rapidly form covalent linkages when mixed together. Such compositions are particularly well suited for use in a variety of tissue related applications when rapid adhesion to the tissue and gel formation is desired along with drug delivery. For example, the compositions are useful as tissue sealants, in promoting hemostasis, in effecting tissue adhesion, in providing tissue augmentation, and in the prevention of surgical adhesions.

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1. A drug-delivery system comprising: a first container comprising a first component consisting of a sulfhydryl group-containing compound of formula: Compound1-(SH)m wherein m≧3, the first container further comprising a hydrophobic drug in a micelle, where the micelle is formed from a sulfhydryl gro

1. A drug-delivery system comprising: a first container comprising a first component consisting of a sulfhydryl group-containing compound of formula: Compound1-(SH)m wherein m≧3, the first container further comprising a hydrophobic drug in a micelle, where the micelle is formed from a sulfhydryl group-containing thiol compound and an A-B block copolymer where A is a poly(alkylene oxide) and B is a degradable polyester; anda second container comprising a second component consisting of a sulfhydryl reactive group-containing compound of formula: Compound2-Yn, wherein Y is a sulfhydryl reactive acrylate group and wherein n≧3;wherein each of Compound1 and Compound2 is a multi-arm polymer comprising polyalkylene oxide;wherein a biocompatible gel forms in less than one minute after contact between the contents of the first container and the contents of the second container, the gel comprising covalent bonds formed between the sulfhydryl reactive groups of the second component and the sulfhydryl groups of each of the first component and the thiol compound; and wherein the hydrophobic drug is admixed in the biocompatible gel. 2. The drug-delivery system of claim 1, wherein m and n are each 4 or 12. 3. The drug-delivery system of claim 1, wherein the polyalkylene oxide is polyethylene glycol. 4. The drug-delivery system of claim 1 wherein the first component is in a liquid medium having an alkaline pH and the second component is in powder form or a liquid medium having a neutral or acidic pH. 5. The drug-delivery system of claim 1 wherein the hydrophobic drug is a cell cycle inhibitor. 6. A method for forming a drug-loaded biocompatible gel in situ, comprising: providing a first container comprising a first component consisting of a sulfhydryl group-containing compound of formula: Compound1-(SH)m in a liquid medium having an alkaline pH, wherein m≧3, where the first container further comprises a hydrophobic drug in a micelle, where the micelle is formed from a sulfhydryl group-containing thiol compound and an A-B block copolymer where A is a poly(alkylene oxide) and B is a degradable polyester;providing a second container comprising a second component consisting of a sulfhydryl reactive acrylate group-containing compound of formula: Compound2-Yn in powder form or a liquid medium having a neutral or acidic pH, wherein Y is a sulfhydryl reactive acrylate group and wherein n≧3;wherein each of Compound1 and Compound2 is a multi-arm polymer comprising polyalkylene oxide; andcombining the contents of the first container and the second container to form a gel incorporating the hydrophobic drug, wherein the sulfhydryl groups of each of the first component and the thiol compound react with the sulfhydryl reactive acrylate groups of the second component to form covalent bonds there between. 7. The method of claim 6, wherein m and n are each 4 or 12. 8. The method of claim 6 wherein the hydrophobic drug is a cell cycle inhibitor. 9. A method for forming a drug-loaded biocompatible gel in situ, comprising: providing a powdered mixture of a sulfhydryl group-containing compound of formula: Compound1-(SH)m, wherein m≧3, a sulfhydryl reactive group-containing compound of formula: Compound2-Yn, wherein Y is a sulfhydryl reactive acrylate group and wherein n≧3, and wherein each of Compound1 and Compound2 is a multi-arm polymer comprising polyalkylene oxide;and a hydrophobic drug in a micelle;providing a first buffer having an acidic pH;providing a second buffer having an alkaline pH;combining the powdered mixture with the first buffer to obtain a solution;combining the solution of the powdered mixture with the second buffer to form a gel incorporating the hydrophobic drug in a micelle, where the micelle is formed from a sulfhydryl group-containing thiol compound and an A-B block copolymer where A is a poly(alkylene oxide) and B is a degradable polyester, and wherein the sulfhydryl groups react with the sulfhydryl reactive groups to form covalent bonds there between. 10. The method of claim 9, wherein m and n are each 4 or 12. 11. The method of claim 9, wherein the hydrophobic drug is a cell cycle inhibitor.