In this paper, we present a multi-parameter wearable sensor system within a smartphone to enable a real-time unobtrusive monitoring of core body temperature, electrocardiogram (ear-lead ECG), and blood oxygen saturation (SpO2) on ambulatory patients. Clinical researches illustrating that continuing accurate measurements of core body temperature are crucial to investigate human thermoregulation in ambulatory environment and during activity. On the other part, ECG remains the mainstay test for primary diagnosis and survival analysis of the heart diseases. We implement a wireless multisensory system that measures both the tympanic temperature inside the ear and ECG data from an ear and an arm. The behind-the-Ear device makes desirable to measure ECG data without any chest belt and allow patient move around freely. The proposed Bluetooth device has similarity the form factor of a hearing aid and is wirelessly connected to a smartphone for data transmission and displaying. This device not only gives the doctors access to the core temperature and ECG data in real time, but the device can be controlled – removed and reapplied – by the patient at any time, thus increasing the performance of personal health applications
