Unconstrained Sleep Measuring Device for Breathing Movement 非穿戴式睡眠呼吸運動量測裝置

1. Unconstrained Sleep Measuring Device for Breathing Movement 非穿戴式睡眠呼吸運動量測裝置 Presenter: Kun-Han Jhan Advisor: Dr. Chun-Ju Hou Date:2013/12/25

2. Outline • Problems and Rationale • Purpose and Specific Aims • Background and Literatures Review • Materials and Methods • Preliminary Results • References

3. Problems and Rationale • Insomnia ratio: 19.3 % • Taiwan Society of Sleep Medicine (2013)

4. Problems and Rationale • Sleep disorders • Arousal and sleep fragmentation • Much movement during sleep • Restless legs syndrome during sleep • Periodic limb movements during sleep • Sleep apnea

5. Problems and Rationale • Sleep apnea features • Snoring • Fatigue • Sleep deficit • Duration of breathe pause:10s~90s

6. Problems and Rationale • Technologies for the evaluation of sleep problems • Evaluating the quality of sleep • Sleep diary, questionnaire • Polysomnography (PSG), actigraph • Preventing pressure sore and falling • Air mattress, image monitor, pressure sensing mattress

7. Problems and Rationale • Disadvantage of current techniques in evaluating the quality of sleep • Subjective evaluation • Need to memorize sleeping status after waking up • Need to wear multiple sensors on body • Limitation of manpower in clinical care • The privacy problem

8. Purpose and Specific Aims • Design an unconstrained sleep measuring device for breathing movement. • Analog and digital circuits design • System calibration and experimentalverification

9. Background and Literatures Review • Validation of Unobtrusive Pressure Sensor Array for Central Sleep Apnea Screening Daphne Townsend, Student Member, Rafik Goubran, Fellow, Frank Knoefel, and Judith Leech IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL. 61, NO. 7, JULY 2012

10. Background and Literatures Review • Identifying body movement

11. Background and Literatures Review • Pressure Sensor Array v.s PSG

12. Background and Literatures Review • Detection of Sleep Disordered Breathing with Pressure Bed Sensor Guillermina Guerrero, Juha M. Kortelainen,Elvia Palacios, Anna M. Bianchi,Giulia Tachino, Mirja Tenhunen, Martin O. Méndez,and Mark van Gils 35th Annual International Conference of the IEEE EMBS,Osaka, Japan, 3 - 7 July, 2013

13. Background and Literatures Review • The eight different Pressure Bed Sensor respiration signals

14. Materials and Methods • System architecture Analogy and Digital Circuits Computer Analogy Circuit Module Digital Signal Process Pressure Sensor Mattress Digital Circuit Module Display Pressure Signal BluetoothModule

15. Materials and Methods • System architecture Sensor 1~7 7 –Channel analog signal Constant Voltage Source Bridge circuit AD623 Sensor 8~14 Constant Voltage Source Bridge circuit AD623 Sensor 15~21 Constant Voltage Source Bridge circuit AD623 Pressure Sensor Mattress Multi-channel measurement module Sensor 22~28 Constant Voltage Source Bridge circuit AD623 Sensor 29~35 Constant Voltage Source Bridge circuit AD623 Sensor 36~42 Constant Voltage Source Bridge circuit AD623 Sensor 43~49 Constant Voltage Source Bridge circuit AD623

16. Materials and Methods • Pressure Sensor • Force sensing resistors (FSR) • Flexible

17. Materials and Methods • Design of sensor pad • Size: 70cm × 70cm • No. of sensor: 7 × 7 FSRs

18. Materials and Methods • Bridge circuit • Can detect small resistance changes • Adjust the lower limit of measurement

19. Materials and Methods • Instrumentation Amplifier • AD623 • Frequency response • 800kHz at gain:1 • CMRR: 90dB

20. Materials and Methods • Multi-channel measurement module • 7 Multiplexer • 1 Decoder

21. Materials and Methods • MSP430F5438A • Low Supply Voltage Range • 2.2Vto 3.6V • Ultralow Power Consumption • A/D converter with 12-bit,and 16-channel input • 4USCI • 16K RAM • 256 KB Flash Memory • Shortest cycle instruction execution 125ns • I/O pins:87

22. Materials and Methods • Bluetooth Mode • BTD43x • Low cost • Low power • Serial Port Profile • HyperTerminal Settings • Transmission distance:100m

23. Materials and Methods • System Caliration • FSRcalibration • System calibration

24. Materials and Methods • FSR calibration Different Force input (20 g to 500 g) Pressure sensor Multi-meter (K ohm)

25. Materials and Methods • Calibration of analog circuit different input resistance Analog circuit (49 channel) Multi-meter (V) Input resistance 150k Ω 7k 3k 2k 1k 0.5k

26. Preliminary Results • FSR calibration

27. Preliminary Results • Digital circuit calibration

28. Preliminary Results • Pressure distribution Aspiratory Aspirated

29. Preliminary Results • Pressure distribution Aspiratory Aspirated

30. Preliminary Results • Pressure distribution Aspiratory Aspirated

31. Preliminary Results • Pressure distribution Aspiratory Aspirated

32. References • 台灣睡眠醫學學會http://www.tssm.org.tw/ • Daphne Townsend, Student Member, IEEE, Rafik Goubran, Fellow, IEEE, Frank Knoefel, and Judith Leech(2012), Validation of Unobtrusive Pressure Sensor Array for Central Sleep Apnea Screening,IEEE • Guillermina Guerrero, Juha M. Kortelainen,Elvia Palacios, Anna M. Bianchi, Member,. IEEE,Giulia Tachino, Mirja Tenhunen, Martin O. Méndez,and Mark van Gils, Member, IEEE (2013) "Detection of Sleep-Disorbered Breathing with Pressure Bed Sensor",IEEE, vol. 35, pp. 1342 - 1345

33. Thanks for Your Attention