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. Author manuscript; available in PMC: 2010 Mar 1.
Published in final edited form as: Eur J Pharm Biopharm. 2008 Oct 17;71(3):519–528. doi: 10.1016/j.ejpb.2008.09.022

Figure 4.

Figure 4

Swelling-controlled drug delivery system. When the glassy hydrogel gets in contact with water, the polymer matrix begin to swell and the rubbery phase appears. Drug molecules are able to diffuse out through the rubbery phase.