Desenvolvimento de um sistema de comunicação de baixo consumo para dispositivos implantáveis

Abstract

This work presented the development of an on-demand solution for communication systems applied to implantable devices. The proposed project deals with a passive communication system at 125 kHz with bidirectional half-duplex communication, formed by an external device responsible for sending a request to enable a main communication system and an implantable device that receives the request and responds to the external device if the procedure was successful. The communication of this developed system occurs passively with only an inductive link responsible for sending power to the implantable device and data in both uplink and downlink directions using ASK modulation and Manchester coding, following an own protocol based on IC EM4100. With the prototype of the devices designed and developed was possible to perform two-way communication to 3.5 cm apart with a baud rate equal to 1851.85 bit/s. Although observed an intense difficulty to adjust circuit parameters for a good relationship between power consumption and performance, the system developed was successful in presenting a solution to reduce the energy consumption of implantable devices.