Abstract
The subcutaneous implant, which can realize on-demand drug release, is used for the treatments of some chronic diseases such as chronic pain, diabetes, and osteoporosis. This paper proposes a new type of wireless actuator for potential use in active implantable drug delivery systems. The proposed structure suits both wireless power well, which requires far-field flux traveling and receiving, and actuator design, which should take advantage of strong local magnetic fields. The mover in the actuator generates mechanical movement when power is transferred wirelessly to the actuator, and the mover restores to its original position when the wireless power stops. The maximum oscillation amplitude of the mover can be achieved when the ON and OFF frequency of the wireless power transfer is equal to the mechanical resonant frequency of the mover. Experimental results on a prototype actuator with 20 mm in diameter and 10.3 mm in thickness are given for validating the proposed new idea.
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