Patent
A process for manufacture of hydrogels for burn and injury treatment
TLDR
In this article, a process for the manufacture of hydrogel dressing by cross-linking aqueous solution of synthetic polymer namely poly vinyl alcohol (PVA) and natural polymer agar-agar and one or more of other natural polymers from carageenan, sodium alginate and sodium carboxymethyl cellulose, gum acacia or similar polysaccharides or protein like gelatine etc.Abstract:
In this invention a process for manufacture of hydrogel dressing by cross-linking aqueous solution of synthetic polymer namely poly vinyl alcohol (PVA) and natural polymer agar-agar and one or more of other natural polymers from carageenan, sodium alginate and sodium carboxymethyl cellulose, gum acacia or similar polysaccharides or protein like gelatine etc. by gamma or electron beam irradiation has been described. In the process the ingredients are dissolved in distilled/deionized water at elevated temperatures. The hot solution is poured in disposable plastic mould, closed tightly and subjected to radiation dose between 25 to 60 kGy to give final, ready to use, high water content, transparent, flexible, self adhesive gel dressing. The pre irradiated gel solution contains 5-15 % by weight of PVA, 0.5 to 5 % by weight of natural polymers and distilled water not less than 80 % by weight.read more
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Patent
Multipurpose hydrogel compositions and products
TL;DR: In this paper, sterile hydrogel compositions consisting of polyvinyl alcohol (PVA), polyvinel pyrrolidone (PVP), polysaccharide (PC), polycyclic polysilicon (PCS), and a poly-saccharides were described.
Patent
Hydrogel fibres and fibrous structures
TL;DR: In this article, the first fiber raw material contains water-soluble polyvinyl alcohol and/or polyvinel alcohol copolymer, and a predetermined tempering temperature that is preferably higher than the glass transition temperature and lower than the melting or decomposition temperature of the first fibre raw material is employed.
Patent
Hydrogel and biomedical applications thereof
Xavier Bourges,Serge Baroth +1 more
TL;DR: In this paper, a method for preparing a cross-linked sterile and homogeneous hydrogel for injection, characterized in that it comprises the following steps: (a) preparing an aqueous solution containing a polymer derived from cellulose and at least one water-soluble polymer, the total polymer content ranging from 0.5 and 5 wt %, and (b) optionally adding sold particles; (c) pouring the resulting liquid mixture with the optional solid particles into a vessel and closing dais vessel using a watertight and gas-tight system; and (d
Patent
Chitosan gel for dermatological use, production method therefor and use of same
TL;DR: In this article, pharmaceutical compositions designed to leave a protective film on the skin, comprising chitosan and agents conferring curative, calming and hydrating properties on irritated skin.
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Journal ArticleDOI
Radiation formation of hydrogels for biomedical purposes. Some remarks and comments
TL;DR: In this paper, the formation of hydrogels by means of radiation technique is described and some differences connected with irradiation in solid state and solution are pointed out, and structures of primary macroeradicals of some hydrophillic polymers are given.
Patent
Method of manufacturing hydrogel dressings
TL;DR: A method of manufacturing hydrogel dressings from synthetic and natural polymers by polymerization and cross-linking involves pouring aqueous solutions of synthetic polymers, such as polyacrylamide and polyvinylpyrolidone, their monomers or their mixtures, natural polymer solvers, or their mixture of mixtures and, possibly, poly/ethylene glycol or poly/propylene glycol, into a mould imparting a shape to the dressing, tightly closing in that mould and subjecting to an ionizing radiation dose not smaller than
Journal ArticleDOI
Physical properties of gamma irradiated poly(vinyl alcohol) hydrogel preparations
TL;DR: In this article, polyvinyl alcohol films from 15% w/w aqueous solutions and a thickness of 0.2 mm were selected for a study where they were first humidified and then acetalized and/or gamma irradiated.
Patent
Hydrogel, process of preparation and use in the field of dressings
TL;DR: In this paper, a hydrogel as novel industrial product, comprising of water, PVA, polyoxyethylene, and glutaraldehyde in such quantity that the total glut-araldehyde content is lower than or equal to 0.1% by weight in relation to the weight of the hydrogels.