?:definition
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Solid sterile preparation consisting of a usually pliable, absorbent piece of material (e.g. collagen), usually impregnated with a liquid preparation, intended for implantation in the body. The material may be cut into smaller pieces before implantation, and may be shaped around a tissue (e.g. a bone) or inserted into a medical device that is then implanted. Implantation matrices are intended for release over an extended period of time, usually in order to obtain a local effect. Usually the matrix disappears with time. When the product is packaged as a separate matrix, powder and solvent (or matrix and solution), which are used to prepare the implantation matrix immediately before use, the appropriate combined term should be used; see for example \'Powder, solvent and matrix for implantation matrix\'.
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