Abstract
The paper is a literature review with 111 references on the polymeric implants forming in the site of incorporation into organism. This kind of materials may have only a structural function, but they can also serve as carriers of bioactive compounds in the treated site. In situ forming implants (ISFI) can be obtained by reaction of functional groups contained in the system components or as a result of physical processes. ISFI serving as injectable scaffolds intended for tissue regeneration and the requirements that should be fulfilled by these materials are presented. Also, various ideas for using ISFI as controlled drug delivery systems, in particular clinically used materials, are described. The attention is focused on the systems solidifying by solid phase separation, based on aliphatic polyesters accepted for biomedical applications. The composition of these systems and the influence of solvent and polymer molecular weight on the rate of implant formation as well as kinetics of bioactive substance release are discussed.
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