In this paper, a design of a microcontroller based Wi-Fi adapter for medical application is proposed. The adapter will enable data logging from an implantable biosensor directly into a Smart device, laptop, or servers connected with hospital's Wi-Fi network. This will allow medical doctors to analyze important physiological data in real time from a remote distance. The design has been prototyped in laboratory and the advantage of the proposed adapter is demonstrated for wireless capsule endoscopy application. An Android mobile app is developed for Smartphone for storing, decoding and displaying endoscopy images in real-time.