unconstrained sleep measuring device for breathing movement ...
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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
OutlineOutline
Problems and RationalePurpose and Specific AimsBackground and Literatures ReviewMaterials and MethodsPreliminary ResultsReferences
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Problems and RationaleProblems and Rationale
Insomnia ratio: 19.3 %◦Taiwan Society of Sleep Medicine (2013)
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Problems and RationaleProblems and Rationale
Sleep disorders◦Arousal and sleep fragmentation ◦Much movement during sleep◦Restless legs syndrome during sleep◦Periodic limb movements during sleep◦Sleep apnea
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Problems and RationaleProblems and Rationale
Sleep apnea features◦Snoring◦Fatigue◦Sleep deficit◦Duration of breathe pause:10s~90s
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Problems and RationaleProblems 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
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Problems and RationaleProblems 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
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Purpose and Specific AimsPurpose and Specific Aims
Design an unconstrained sleep measuring device for breathing movement.◦Analog and digital circuits design◦System calibration and experimental
verification
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Background and Literatures ReviewBackground and Literatures Review
Validation of Unobtrusive Pressure Sensor Array for Central Sleep Apnea Screening
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Daphne Townsend, Student Member, Rafik Goubran, Fellow, Frank Knoefel, and Judith Leech
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL. 61, NO. 7, JULY 2012
Identifying body movement
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Background and Literatures ReviewBackground and Literatures Review
Background and Literatures ReviewBackground and Literatures Review
Pressure Sensor Array v.s PSG
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Background and Literatures ReviewBackground and Literatures Review
Detection of Sleep Disordered Breathing with Pressure Bed Sensor
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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
Background and Literatures ReviewBackground and Literatures Review
The eight different Pressure Bed Sensor respiration signals
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Materials and MethodsMaterials and Methods
System architecture
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PressureSensor
Mattress
Analogy Circuit Module
Digital Circuit Module
Analogy and DigitalCircuits
Bluetooth Module
Computer
Digital Signal
Process
Display Pressure Signal
Materials and MethodsMaterials and Methods
System architecture
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PressureSensor
Mattress
Constant Voltage Source
Constant Voltage Source
Constant Voltage Source
Constant Voltage Source
Constant Voltage Source
Constant Voltage Source
Constant Voltage Source
Bridge circuit
Bridge circuit
Bridge circuit
Bridge circuit
Bridge circuit
Bridge circuit
Bridge circuit
AD623
AD623
AD623
AD623
AD623
AD623
AD623
Multi-channel measurement
module
Sensor1~7
Sensor8~14
Sensor15~21
Sensor22~28
Sensor29~35
Sensor36~42
Sensor43~49
7 –Channel analog signal
Materials and MethodsMaterials and Methods
Pressure Sensor◦Force sensing resistors (FSR)
Flexible
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Materials and MethodsMaterials and Methods
Design of sensor pad◦Size: 70cm × 70cm◦No. of sensor: 7 × 7 FSRs
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Materials and MethodsMaterials and Methods
Bridge circuit◦Can detect small resistance changes◦Adjust the lower limit of measurement
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𝐕𝐏𝐐= 𝐕𝐫𝐞𝐟ቆ 𝐑𝟑𝐑𝟐 + 𝐑𝟑− 𝐑(𝐓)𝐑𝟏 + 𝐑(𝐓)ቇ
Materials and MethodsMaterials and Methods
Instrumentation Amplifier◦ AD623◦ Frequency response
800kHz at gain:1◦ CMRR: 90dB
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Materials and MethodsMaterials and MethodsMulti-channel measurement module
◦7 Multiplexer ◦1 Decoder
Multiplexer
Multiplexer
Multiplexer
Multiplexer
Multiplexer
Multiplexer
Multiplexer
3-8 decoder
Digital circuits
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3
7-Channel analog signal
7-Channel analog signal
7-Channel analog signal
7-Channel analog signal
7-Channel analog signal
7-Channel analog signal
7-Channel analog signal
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Materials and MethodsMaterials and MethodsMSP430F5438A
◦Low Supply Voltage Range 2.2V to 3.6V
◦Ultralow Power Consumption◦A/D converter with 12-bit,and 16-channel
input ◦4 USCI◦16K RAM◦256 KB Flash Memory◦Shortest cycle instruction execution 125ns◦I/O pins:87
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Materials and MethodsMaterials and Methods
Bluetooth Mode◦BTD43x◦Low cost◦Low power◦Serial Port Profile ◦HyperTerminal Settings◦Transmission distance:100m
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Materials and MethodsMaterials and Methods
System Caliration◦FSR calibration◦System calibration
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Materials and MethodsMaterials and Methods
FSR calibration
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Different Force input
(20 g to 500 g)Pressure sensor
Multi-meter(K ohm)
Materials and MethodsMaterials and Methods
Calibration of analog circuit
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different input resistance
Analog circuit(49 channel)
Multi-meter(V)
Input resistance1)150k Ω2)7k3)3k4)2k5)1k6)0.5k
Preliminary ResultsPreliminary Results
FSR calibration
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Preliminary ResultsPreliminary Results
Digital circuit calibration
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Preliminary ResultsPreliminary Results
Pressure distribution
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Aspiratory Aspirated
Preliminary ResultsPreliminary Results
Pressure distribution
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Aspiratory Aspirated
Preliminary ResultsPreliminary Results
Pressure distribution
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Aspiratory Aspirated
Preliminary ResultsPreliminary Results
Pressure distribution
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Aspiratory Aspirated
ReferencesReferences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
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Thanks for Your Attention
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