Photopolymerizable biodegradable hydrogels as tissue contacting materials and controlled-release carriers
First Claim
1. A method of forming a polymeric, biocompatible material on tissue or cells, the method comprising applying to the tissue or cells a solution of biodegradable, polymerizable macromer having a solubility of at least about 1 g/100 ml in an aqueous solution comprising at least one water soluble region, at least one degradable region which is hydrolyzable under in vivo conditions, and free radical polymerizable end groups having the capacity to form additional covalent bonds resulting in macromer interlinking, wherein the polymerizable end groups are separated from each other by at least one degradable region, in the presence of a free radical initiator, and polymerizing the macromer.
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Abstract
Hydrogels of polymerized and crosslinked macromers comprising hydrophilic oligomers having biodegradable monomeric or oligomeric extensions, which biodegradable extensions are terminated on free ends with end cap monomers or oligomers capable of polymerization and cross linking are described. The hydrophilic core itself may be degradable, thus combining the core and extension functions. Macromers are polymerized using free radical initiators under the influence of long wavelength ultraviolet light, visible light excitation or thermal energy. Biodegradation occurs at the linkages within the extension oligomers and results in fragments which are non-toxic and easily removed from the body. Preferred applications for the hydrogels include prevention of adhesion formation after surgical procedures, controlled release of drugs and other bioactive species, temporary protection or separation of tissue surfaces, adhering of sealing tissues together, and preventing the attachment of cells to tissue surfaces.
410 Citations
43 Claims
- 1. A method of forming a polymeric, biocompatible material on tissue or cells, the method comprising applying to the tissue or cells a solution of biodegradable, polymerizable macromer having a solubility of at least about 1 g/100 ml in an aqueous solution comprising at least one water soluble region, at least one degradable region which is hydrolyzable under in vivo conditions, and free radical polymerizable end groups having the capacity to form additional covalent bonds resulting in macromer interlinking, wherein the polymerizable end groups are separated from each other by at least one degradable region, in the presence of a free radical initiator, and polymerizing the macromer.
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5. A method of forming a polymeric, biocompatible material on tissue, the method comprising:
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applying a free radical initiator at a tissue site; and applying to the tissue site a solution of biodegradable, polymerizable, and at least substantially water soluble macromer comprising at least one water soluble region, at least one degradable region, and at least two free radical polymerizable regions, wherein the polymerizable regions are separated from each other by at least one degradable region, and polymerizing the macromer in the presence of the free radical initiator.
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6. A method of forming a polymeric, biocompatible material on tissue, the method comprising:
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applying a free radical initiator to a tissue site, permitting the initiator to bind to the tissue, and removing unbound initiator; applying to the tissue site, after removal of the unbound initiator, a solution of biodegradable, polymerizable, and at least substantially water soluble macromer comprising at least one water soluble region, at least one degradable region, and at least two free radical polymerizable regions, wherein the polymerizable regions are separated from each other by at least one degradable region, and polymerizing the macromer in the presence of the free radical initiator.
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39. A method of forming a polymeric, biocompatible material on a surface, the method comprising:
applying to the surface a solution of a biodegradable, polymerizable macromer, having a solubility of at least about 1 g/100 ml in an aqueous solution, and comprising at least one water soluble region, at least one degradable region which is hydrolyzable under in vivo conditions, and free radical polymerizable end groups, wherein the polymerizable end groups are separated from each other by at least one degradable region, in the presence of a free radical initiator, and polymerizing the macromer. - View Dependent Claims (40, 41, 42, 43)
Specification