DRESSING COMPOSITIONS AND METHODS
First Claim
1. A wound dressing, comprisinga first component comprising a hydrophilic polymer having a sulfhydryl, thiol, or mercaptan moiety;
- anda second component comprising a cross-linker, said cross-linker forming reversible cross-linkages with the hydrophilic polymer;
wherein the first and second components form a material that adheres to skin of a mammal and acts as a wound dressing.
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Accused Products
Abstract
Described is a spray-on hydrogel comprising water-soluble PEG polymers that cross-link in situ to form a hydrogel such that the cross-links are reversible. The hydrogel can be useful as a drug delivery composition, wound dressing or surgery adjuvant. Polyethylene glycol polymer and cross-linker solutions are sprayed simultaneously through a common orifice. Cross-linking via formation of thioether or disulfide bonds is initiated upon mixing, providing rapid gelation. The hydrogel components can be derivatized with RGD peptides or analogs thereof to promote retention in/on a body compartment such as the skin, surface of the eye, or a mucosa such as the vaginal mucosa. The cross-links are reversed using a reducing solution enabling easy removal of the hydrogel by dissolution. Processes for preparation of the cross-linker, RGD derivatized PEG and RGD-linked agents are also disclosed.
44 Citations
46 Claims
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1. A wound dressing, comprising
a first component comprising a hydrophilic polymer having a sulfhydryl, thiol, or mercaptan moiety; - and
a second component comprising a cross-linker, said cross-linker forming reversible cross-linkages with the hydrophilic polymer; wherein the first and second components form a material that adheres to skin of a mammal and acts as a wound dressing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 28, 30, 31, 32, 35, 36, 41, 42, 43)
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14. An ocular dressing, comprising
a first component comprising a hydrophilic polymer having a sulfhydryl, thiol, or mercaptan moiety; - and
a second component comprising a cross-linker, said cross-linker forming reversible cross-linkages with the hydrophilic polymer; wherein the first and second components form a material that adheres to the ocular surface of an eye of a mammal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 33, 34)
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37. A method of preparing a cross-linked hydrogel composition for application to the skin, said method comprising:
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a. providing a polymer in solution, b. providing in a separate solution a cross-linker that forms reversible cross-links, c. administering both solutions concomitantly from at least one nozzle permitting mixing of the polymer and cross-linking solutions in order to provide rapid gelation of the reversibly cross-linked hydrogel at the site of administration. - View Dependent Claims (38, 39, 40)
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44. A wound or ocular dressing kit, comprising
a first component comprising a hydrophilic polymer having a sulfhydryl, thiol, or mercaptan moiety; -
a second component comprising a cross-linker capable of forming a reversible cross-linkages with the hydrophilic polymer, said first and second components being supplied as separate solutions and being mixed together during administration to a wound site such that a reversible cross-linked gel matrix forms as a wound dressing on the surface of the wound in less than about 30 minutes. - View Dependent Claims (45, 46)
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Specification