Abstract:
A bone or dental implant material in the form of a paste includes a mixture of calcium phosphate and/or calcium-containing powders, liquid glycerol, organic acid and gelling agent. The paste is stable, resistant to washout and will harden upon exposure to water. Physical characteristics of the paste, including consistency, porosity, and hardening time, are controlled by the choice and ratio of constituents.
Abstract:
The present invention relates to microbeads comprising natural polysaccharides selected from alginic acid and chitosan, and hyaluronic acid, and processes for preparing the same. The microbeads according to the present invention are biocompatible and have a high swelling property and thus can be used for various purposes such as post-operative adhesion-preventing gels or films, materials for wrinkle treatment, materials for plastic surgery, materials for arthritis treatment, and drug delivery vehicles. Especially, the chitosan-hyaluronic acid microbead and the chitosan-coated alginic acid-hyaluronic acid microbead, in which an amide bond is formed between the amine group of chitosan and the carboxyl group of hyaluronic acid and/or alginic acid, have an excellent swelling property, physical stability and viscoelasticity and thus can be used as biocompatible materials able to withstand various in vivo conditions.
Abstract:
A wound dressing containing cellulose-containing material and alginate, wherein the alginate is crosslinked through a polycarboxylic acid ester bond to the cellulose of the cellulose-containing material. A method for preparing a wound dressing is disclosed wherein alginate is crosslinked to cellulose through a polycarboxylic acid ester bond, comprising introducing cellulose-containing material into an aqueous solution wherein the aqueous solution contains water, alginate, a crosslinker, optionally an acid catalyst, and optionally polyethylene glycol to form cellulose-containing material wherein alginate is crosslinked to cellulose through a polycarboxylic acid ester bond, drying, and curing. A wound dressing wherein the wound dressing is prepared by the above method.
Abstract:
Es wird eine Vorrichtung zur Herstellung von Mikrokapseln (1) aus einer vernetzungsfähigen Kapselsubstanz, insbesondere aus vernetzten Alginaten beschrieben, mit einer ersten Abgabeeinrichtung (2) zur Abgabe eines Strahls der vernetzungsfähigen Kapselsubstanz und einer Vernetzungseinrichtung zur Applizierung eines Vernetzungsmittels auf die Kapselsubstanz, wobei die Vernetzungseinrichtung eine zweite Abgabeeinrichtung (5) aufweist, die einen Strahl (9, 13) des Vernetzungsmittels auf den Strahl der Kapselsubstanz richtet.
Abstract:
To produce a hardened tube of biocompatible material, a regulator member (318) is moved in contact with a body of hardenable liquid along a conduit (303) so that a thin layer of the liquid is formed, which immediately contacts a hardening fluid to form the hardened tube. The tube may incorporate viable cells which are then cultured in the conduit (303) to prepare a surgical implant.
Abstract:
Biocompatible hydrogels, for: scaffoldings for tissue engineering; cell encapsulation matrices; injectable bulking materials for cosmetic and functional restorations; controlled release matrices; gene delivery vehicles; immunoprotection matrices; immobilization materials; food additives; medical gels; conductive electrode gels; lubricious coatings; film forming creams; membranes; superabsorbents; hydrophilic coatings; and wound dressings. The hydrogels include: at least one water-soluble polymer/copolymer; and at least one slow and/or fast dissolving and/or releasing divalent and/or multivalent cation-containing compound. At least one of the monomers is an acid, and/or contains an acid group or a derivative thereof. Such monomer reacts with the cations to form a three-dimensional ionically crosslinked hydrogel composition. A method for preparing such a composition comprises the step of controlling a rate of gel formation by varying at least one of: solubility of the cation containing compounds; cation concentration; mixture of cation containing compounds; polymer concentration; gelation temperature.
Abstract:
The invention concerns an aqueous biocompatible gel composition of polysaccharides characterised in that it comprises a mixture of at least two polysaccharides one of which is capable of being gelled by chemical process and the other by heat process and the use of such a composition for preparing an implant. The inventive composition is characterised in that it further contains biological tissue extracts and/or an active pharmaceutical principle alone or combined.
Abstract:
Process for reducing viscosity in an aqueous polysaccharide composition comprising combining the aqueous composition with a non-aqueous viscosity reducing agent. In particular, processes for reducing the viscosity in an aqueous carbohydrate gum composition. In particular, processes for reducing viscosity of an aqueous composition of polysaccharide comprising combining viscosity reducing agent with the polysaccharide composition in an amount effective to form a two phase system. Products produced according to the aforementioned processes are also described. Aqueous compositions including polysaccharide and non-aqueous viscosity reducing agent, and wherein the water content of the composition is at least about 40 wt.%. Aqueous compositions including polysaccharide and non-aqueous viscosity reducing agent and wherein the viscosity of the composition is reduced by at least 10%. Processes for resolubilizing solid oxidized carbohydrate gum comprising combining aqueous solvent with the oxidized carbohydrate gum under conditions effective to give a resolubilized composition a pH less than about 7.
Abstract:
This invention relates to polysaccharide fibres having water absorption properties characterised by the incorporation within the fibres of at least one substance having anti-microbial properties, and to wound dressings formed from said fibres. The polysaccharide fibres are preferably formed from alginate or alginate containing additional polysaccharide materials to give additional absorbency (such as, for example, sodium carboymethyl cellulose). The fibres preferably contain a silver compound as an antimicrobial agent.