A numerical model for implantable telemetry system analysis and design is presented. This model can adequately be used to predict optimum telemetry coil geometries for best performance of the system considered. The numerical model is based upon a generalized formulation of the electromagnetic field coupling between an external instrument coil, and an implanted coil in a tissue stimulater. Variational techniques in conjunction with the finite element method are used to solve the obtained partial differential equation subject to proper boundary conditions. The numerically obtained coil geometries, as well as performance measures were in excellent agreement with lab measurements. The work presented here can greatly contribute to the reduction of telemetry system development time and cost as well as to the improvement of system performance through optimization studies.
