Revisimo

Remote Vital Sign Monitor

About us

Dr. Thomas Morris

Advisor

CoryZywno

EEData Transmission

MatthewGalloway

EEADC & Temperature Sensor

MatthewGallups

EEAlarm & ADC

AaronCheeseman

EEMonitor &PCB design

PaulJang

CPEData 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 ConstraintsBattery 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

Name Frequency Band

Data Rate Nominal Range Application

ZigBee 900 MHz; 2.4 GHz

250 kbit/s 10m - 100 m WSNs

Bluetooth 2.4 GHz 1 Mbit/s 10 m PANs

Wi-Fi 2.4 GHz 54 Mbit/s 100 m Wireless Internet

Ultra Wideband

3.1 – 10.6 GHz 110 Mbit/s 10 m Multimedia

Microprocessors

Name Size Integrated Radio

ADC Comm. Interfaces

Resources Available

CC2430 7 mm x 7 mm

2.4 GHz DSSS

12 bits

UART, SPI

Prototyping Boards/Stack

PIC24 6 mm x 6 mm

None 10 bits

UART, I2C, SPI

Code examples for PIC architecture

Temperature Sensing DevicesName # of wires

or pinsCost Sensitivity Linear

Thermistor 2 Low-Mid Good No

Resistance Temperature Detector (RTD)

2-4 Low-High Poor Yes

Thermocouple 2 Low- High Poor No

Digital IC’s Multiple Low-Mid Good Yes

Fourier’s Law of Heat Conduction

• Bandage reduces ambient, evaporative, and environmental heat loss

• TsTbTshhTc

skin

bandage

Progress: Radio Testing

Progress: ADC Noise0x1327: 0

0x1328: 3

0x1329: 29

0x132A: 2656

0x132B: 2656

0x132C: 7773

0x132D: 11340

0x132E: 8045

0x132F: 2576

0x1330: 320

0x1331: 9

0x1332: 0

Total: 33232

• Reduces accuracy of measurements• Measure a thermistor multiple times

TimelineJanuary February March April

Research

Radio

Hardware

Assembly

Testing

References[1] http://www.longbeachrealestatehome.com/m/blogs/lbreh/bandaid.jpg, Accessed:

February 18, 2009[2] Information Technology Strategic Plan,

http://www.fcc.gov/omd/strategicplan/InfoTechnologyPlansandReports/itsp-07-23-02.pdf, Accessed: February 18, 2009

[3] http://www.ussensor.com/pgthermistors.html, Accessed: February 23, 2009[4] http://www.omega.com/toc_asp/subsectionsc.asp?book=Temperature&subsection=C

11&flag=1, Accessed: February 23, 2009[5] http://www.omega.com/guides/thermocouples/Unsheathed.html, Accessed: February

23, 2009[6] http://media.digikey.com/photos/Texas%20Instr%20Photos/296-SOT-23-6.jpg,

Accessed: February 23, 2009[7] I. G. Finvers, J. W. Haslett, and G. Jullien, “Wireless Temporal Artery Bandage

Thermometer.” Biomedical Circuits and Systems Conference, 2006. BioCAS 2006. IEEE, pp.166-169, Nov. 29 2006-Dec. 1 2006. [Online] Available http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=4600334&isnumber=4600290

Questions?

Thank you!