Embodiments of the invention provide systems and methods for delivering therapeutic compositions to the inner-ear to treat inner-ear disorders. An embodiment of such a system comprises a sheath for insertion into the auditory canal and a cannula which can be inserted through the sheath. The cannula can include a tip for piercing the tympanic membrane and delivering the composition to an inner-ear tissue surface. The system may also include a therapeutic composition comprising a therapeutic agent and a thixotropic material which allows the composition to be delivered (e.g., by injection) through the cannula in liquid form and transition to gel-form once delivered to the tissue surface. A method for using the system comprises introducing the sheath into the ear, introducing the cannula through the sheath to pierce the tympanic membrane and position the tip adjacent an inner-ear tissue surface and delivering the composition through the cannula to adhere to the tissue surface.
