Protective gel based on chitosan and oxidized polysaccharide
First Claim
1. An article of manufacture comprising a crosslinked hydrogel layer reacted from a fluid mixture containing chitosan and oxidized polysaccharide in amounts sufficient to form a protective gel layer in situ, the crosslinked hydrogel layer being in contact with and coating and conforming to the shape of cilia on a ciliated mucosal tissue in an ear, nasal cavity, sinus cavity or throat, the chitosan having a number average molecular weight before sterilization of at least about 50 kDa, and wherein the crosslinked hydrogel layer provides a protective gel layer that remains exposed to air or other nearby gases, reduces adhesions to anatomy, is biodegradable or bioresorbable without shedding large solid chunks and resists detachment or other disruption from such tissue until natural degradation or resorption of the protective gel layer takes place.
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Abstract
Bodily tissue and structures may be protected using a fluid layer containing a mixture of chitosan and oxidized polysaccharide. The mixture forms a protective gel layer via in situ crosslinking. Compared to crosslinking using a low molecular weight aldehyde such as glutaraldehyde or genipin, oxidized polysaccharides appear to provide faster gelation while avoiding the use of potentially less bioacceptable low molecular weight aldehydes.
105 Citations
21 Claims
- 1. An article of manufacture comprising a crosslinked hydrogel layer reacted from a fluid mixture containing chitosan and oxidized polysaccharide in amounts sufficient to form a protective gel layer in situ, the crosslinked hydrogel layer being in contact with and coating and conforming to the shape of cilia on a ciliated mucosal tissue in an ear, nasal cavity, sinus cavity or throat, the chitosan having a number average molecular weight before sterilization of at least about 50 kDa, and wherein the crosslinked hydrogel layer provides a protective gel layer that remains exposed to air or other nearby gases, reduces adhesions to anatomy, is biodegradable or bioresorbable without shedding large solid chunks and resists detachment or other disruption from such tissue until natural degradation or resorption of the protective gel layer takes place.
Specification