Modeling of Transcutaneous Energy Transfer System for an Implantable Gastrointestinal Stimulation Device

This study models a transcutaneous energy transmission system which can supply DC power to an implanted device without an external battery. The goals of the study are to: (1) develop a model to describe the transcutaneous energy transmission system; and (2) use the developed model to design a transcutaneous energy transmission system for an implantable gastrointestinal neurostimulator. The complete trancutaneous energy system includes a power amplifier, a highly inductive coupling structure, and an ac-to-dc rectifying circuit in the receiver. Power amplification is based on the single-ended class E amplifier concept. The power amplification stage is self-oscillating, and the oscillation frequency is influenced by the coupling of the coils. The highly inductive coupling structure employs the stage tuning concept. Design methods and detailed analysis are provided. The proposed model is verified through the implementation of the design.