Mechanical deformation of polymer matrix controlled release devices modulates drug release

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Abstract
When magnetic fields were applied to polymer matrices of ethylene‐vinyl acetate copolymer embedded with drug and a small magnet, drug release was increased up to 30‐fold above baseline levels. It has been hypothesized that the effect of magnetic stimulation on the release of drugs from these matrices is the transduction of the applied magnetic field into a mechanical deformation of the matrix through motion of the magnet within the matrix. This current study provides support for this hypothesis by demonstrating that repeated pulsatile mechanical deformation of matrices can enhance the release of macromolecules from ethylenevinyl acetate copolymer matrices. Furthermore, similar modulated release kinetics were obtained with mechanically compressed and magnetically stimulated matrices. We also established that modulation was dependent on the ratio of compression area to matrix volume and that modulation was maximized when this ratio was optimized. © 1992 John Wiley & Sons, Inc.