FIGURE 19.3 (A) Desired properties of polymer implants include drug release by degradation instead of diffusion. (Reprinted with permission) . (B) Biodegradable controlled-release polymer implants are intended to release content at nearly constant rate (zero-order kinetics) as they dissolve in body water. Therefore, desired properties include (a) surface erosion instead of (b) bulk erosion. (Reprinted with permission) .
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