Abstract: The invention relates to the use of implantable microcapsules, or microparticles or gels produced from alginates that are crosslinked with bivalent or multivalent cations or that are uncrosslinked, for the treatment of skin defects such as e.g. wrinkles, for the treatment of gastro-oesophageal reflux, urinary incontinence and vesico-ureteral reflux.

Abstract: A stable cross-linked alginate gel such as in the form of alginate gel beads encapsulating transplant materials is produced by binding surplus multivalent cations remaining after cross-linking alginate with the cations. A cross-linked alginate gel containing the surplus cations is contacted with a solution of multivalent anions such as sodium sulfate solution to bind the surplus cations. Preferably, a dehydration preventing agent such as protein, bone powder or implant substances is present during cross-linking. A hydrophobic substance such as a perfluoro hydrocarbon or an emulsion may be present during cross-linking to fill spaces between alginate chains. Alginate gel beads produced by the process have long term stability after transplanting.