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Biotelemetry Unit

Biotelemetry Unit. Tom Mathew Andrew Whiting Dawnell Williams. Project Goal. The goal of our project is to save lives by speeding up medical response to persons in need. By creating a relatively inexpensive, wireless home monitoring system, we hope to add a new dimension to health care.

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Biotelemetry Unit

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  1. Biotelemetry Unit Tom Mathew Andrew Whiting Dawnell Williams

  2. Project Goal The goal of our project is to save lives by speeding up medical response to persons in need. By creating a relatively inexpensive, wireless home monitoring system, we hope to add a new dimension to health care.

  3. Create a compact low cost biotelemetry unit that will monitor patient’s blood pressure, heart rate and temperature Transmit patient data wirelessly for evaluation at local PC LabVIEW to display real time patient data and evaluate data for emergency situation Project Implementation

  4. Sensors • Blood Pressure Sensor • Electrocardiogram (ECG) • Temperature Sensor

  5. Blood Pressure Sensor • Flexible Diaphragm Tonometer - non-invasive blood pressure measurement - real-time data acquisition - compact

  6. Reasons for Rejecting Tonometer • Precision manufacturing required • Lack of available design information • Time constraints

  7. Electrocardiogram (ECG) • Chosen as replacement for blood pressure sensor • Allows measurement of patient’s pulse • Can be further expanded for accurate cardiac diagnostics

  8. ECG Circuit • Three electrodes used to obtain signal - Left arm, Right Arm (Signal) - Right Chest (Ground) • Amplitude of ECG signal is a few millivolts • Differential amplifier used to measure changes in biopotentials sent through electrodes • Non-inverting amplifier used to further amplify signal to a few volts

  9. Amplifier Schematics

  10. ECG Waveform 1 84 BPM

  11. ECG Waveform 2 96 BPM

  12. Temperature Sensor • Contact device desired to provide accurate reading of body temperature - supplier could not provide sensor • Used ambient sensor to replace contact sensor - provided acceptable output for testing purposes - required amplification for improved dynamic accuracy

  13. Scalability • Easily expandable for more sensory inputs - add A/D converter - add few lines of code to Basic Stamp

  14. Data Conversion and Transmission • Analog to Digital Converter • Basic Stamp 2 • Transmitter and Receiver • TTL to RS-232

  15. A/D converter • Sensors output analog signals which need to be converted to digital signals • 8-bit conversion maps 0-5 Volts to a byte representing 0 to 255 • A/D selected by Basic Stamp and outputs serial TTL

  16. Basic Stamp 2 • Used to combine multiple sensor outputs in order to transmit on one frequency • Alternates between sensors’ digital signals and sends them into the transmitter • Provides a clock and enable signals for A/D converters • Adds delimiters to make it easier to separate and analyze data in LabVIEW

  17. Transceiver • Decision on transceiver type - Motorola MC13176 vs. Linx Modules - Factors complexity of transceiver compactness of unit

  18. Comparing Transmitters MC13176 LINX module

  19. LINX modules • Easy to implement transmitter and receiver • Does not require extensive external circuitry • Transmits digital data

  20. Receiver • Meets design specifications for receiving data up to 30 feet • Use MAX232 to convert data for serial input into PC • Make serial connection to PC

  21. RS-232 Wiring

  22. Digital Transceiver Schematic

  23. BS2 Output vs Serial Input

  24. LabVIEW • Used to display and analyze data • Suitable for serial port applications • Provides user with interactive display • Ease of programming

  25. Importing Data • Data acquired through serial port - serial port read program available in LabVIEW • Used delimiters to separate two signals for processing • Sampling rate limited by A/D converters

  26. Processing Data • Obtaining heart rate from simulated ECG using function generator • Converting temperature data to degrees Fahrenheit • Comparing data to predetermined thresholds set by user (physician)

  27. Display • Waveforms and data displayed in real-time • Front panel indicators show when vital signs reach thresholds • Call for medical attention made when thresholds reached

  28. LabVIEW Front Panel

  29. Problems and Challenges • Building blood pressure unit • Obtaining proper temperature sensor • LINX module transmitting at fixed frequency • Importing ECG data to LabVIEW • Noise in bench supply voltages

  30. Improvements • Contact temperature sensor • Better A/D’s • Housing for circuit • Data Acquisition Card for LabVIEW • Open communications channel for help

  31. Possibilities • Integrate GPS • Compact and comfortable • Expanded analytical capabilities • Display on telemetry unit • Dispense medication

  32. Medical Telesensor Measures and Transmits Body Temperature (ORNL)

  33. Commercial ECG Telemetry Ultraview Modular Digital Telemetry (Spacelabs Medical)

  34. Thanks We’d like to express our appreciation to Dr. Thomas Ferrell of Oak Ridge National Laboratories, Shao Hsia, Lee Rumsey, and Prof Andrew Webb for their contributions to the success of our project.

  35. Conclusion We feel this is the future of health care in a system of rising costs and patient volume. It provides more efficient means of monitoring patients as well as providing the patient with peace of mind without being restricted to a hospital bed.

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