Revisimo Remote Vital Sign Monitor

About us Dr. Thomas Morris Advisor Cory Zywno EE Data Transmission Matthew Galloway EE ADC & Temperature Sensor Matthew Gallups EE Alarm & ADC Aaron Cheeseman EE Monitor & PCB design Paul Jang CPE Data Transmission & Website

Overview Introduction Problem/Solution Constraints –Technical –Practical Technical Approach Progress Timeline Questions

Introduction What is Revisimo? –Digital wireless Thermometer

Current Problem Hospital equipment –Expensive –Hard to use Market (oral, tympanic, scanning) –Inaccurate & No Alarm –Difficulty of Continuously Monitoring

Solution Bandage –Wireless –Temperature Sensing Device Base station –Alarm –Temperature set by the user

System Overview

Constraints Revisimo must meet a set of predetermined technical and practical constraints ensuring that the device will be competitive in the home-healthcare market. Technical Constraints outline Revisimo’s functionality. Practical Constraints define usability.

Technical Constraints Battery Life Revisimo must have a minimum battery life of seven days. Wireless The bandage and monitor must communicate with each other within a 100-foot radius (indoors). Alarm System The alarm must be triggered if a user defined temperature is reached. Also, the alarm must be audible from at least 30 feet away. Temperature Precision Revisimo must calculate the core body temperature within 0.5 °F. Revisimo must read temperatures within the range of 65 °F to 110 °F. Visual Distance The display must present data to the user at a distance of up to 3 feet.

Manufacturability The bandage must fit on the temple and the monitor must be handheld.

Political Revisimo must abide by Federal Communications Commission regulations and allocations of the radio spectrum (9kHz to 3THz).

Wireless Protocols in Unlicensed Bands NameFrequency Band Data RateNominal RangeApplication ZigBee900 MHz; 2.4 GHz 250 kbit/s10m mWSNs Bluetooth2.4 GHz1 Mbit/s10 mPANs Wi-Fi2.4 GHz54 Mbit/s100 mWireless Internet Ultra Wideband 3.1 – 10.6 GHz110 Mbit/s10 mMultimedia

Microprocessors NameSizeIntegrated Radio ADCComm. Interfaces Resources Available CC24307 mm x 7 mm 2.4 GHz DSSS 12 bits UART, SPI Prototyping Boards/Stack PIC246 mm x 6 mm None10 bits UART, I 2 C, SPI Code examples for PIC architecture

Temperature Sensing Devices Name# of wires or pins CostSensitivityLinear Thermistor2Low-MidGoodNo Resistance Temperature Detector (RTD) 2-4Low-HighPoorYes Thermocouple2Low- HighPoorNo Digital IC’sMultipleLow-MidGoodYes

Fourier’s Law of Heat Conduction Bandage reduces ambient, evaporative, and environmental heat loss

Progress: Radio Testing

Progress: ADC Noise 0x1327: 0 0x1328: 3 0x1329: 29 0x132A: x132B: x132C: x132D: x132E: x132F: x1330: 320 0x1331: 9 0x1332: 0 Total: Reduces accuracy of measurements Measure a thermistor multiple times

Timeline JanuaryFebruaryMarchApril Research Radio Hardware Assembly Testing

References [1] Accessed: February 18, 2009 [2] Information Technology Strategic Plan, 02.pdf, Accessed: February 18, 2009 [3] Accessed: February 23, 2009 [4] 11&flag=1, Accessed: February 23, 2009 [5] Accessed: February 23, 2009 [6] Accessed: February 23, 2009 [7] I. G. Finvers, J. W. Haslett, and G. Jullien, “Wireless Temporal Artery Bandage Thermometer.” Biomedical Circuits and Systems Conference, BioCAS IEEE, pp , Nov Dec [Online] Available

Questions?

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