1. Jack Page, Robyn Hrobsky, Lindsey Carlson, Nicole Daehn
Sleep Lab Monitor
Jack Page, Robyn Hrobsky, Lindsey Carlson, Nicole Daehn
BME 400
October 17, 2008

2. School of Medicine and Public Health
Client:
Christopher G. Green, MD
Dept of Pediatrics
School of Medicine and Public Health
Advisor:
Willis Tompkins
Dept. of Biomedical Engineering
University of Wisconsin - Madison

3. Overview Background Problem Statement Current Devices
Design Alternatives
Design Matrix
Future Work

4. Sleep Disordered Breathing
Affects 18 million Americans
10 million of which remain undiagnosed
Sleep disrupted 100s of times each night
Behavioral, emotional, and social problems
Irritability, agitation, fatigue
Low alertness, attention deficit
Other Health Problems
Delayed mental and physical growth
High blood pressure

5. Polysomnography – Sleep Study Measure physiological parameters related to sleep and breathing
EEG (electroencephalogram) – Brain electrical activity
EOG (electrooculogram) – Eye movements
EMG (electromyogram) – Muscle Movement
ECG (electrocardiogram) – Heart rate/rhythm
Piezo Crystal Effort Sensor – Respiratory effort
Pulse Oximeter – Oxygen saturation
ETCO2, Airway Pressure, Flow
Sensors left to right: EEG, EOG, EMG electrodes, ECG electrodes, 2 effort belts CPAP sensor, Snoring Mic, Finger Sensor, Thermistor, Nasal prong

6. Problems Air Flow Airway Pressure & ETCO2
Thermistors: Measure ΔT between inhaled and exhaled air
Airway Pressure & ETCO2
One side of cannula to a pressure measuring device
Other side to a Capnograph
Problems
Disrupting sleep, uncomfortable
Obstructive, increases nasal resistance
Both don’t measure nasally and orally
Expensive

7. Problem Statement Combine ETCO2, pressure, & flow into one apparatus
Samples from both nostrils and the mouth
Attach in both a durable & comfortable fashion

8. Clip Design Split nasal prongs on cannula
Allow for EtCO2 & nasal pressure measurement from both prongs
Thermistor clips onto front of cannula

9. Cuff Design 3 thermistors Each attached to cuff
Removed for disinfection and reuse
Measures from nose and mouth

10. Imbedded Wire Design 3 Thermistors attached to cannula body
Wires are injected molded onto cannula body
Wires allow flexibility of oral and nasal extensions
Entire interface is disposable

11. Design Matrix TOTAL 1.0 1.20 2.05 2.65 Weight Clip Design Cuff Design
Imbedded Wire
Accuracy
0.25 1 3
Disposable
0.2 2
Cost
Client Interest
Feasibility
0.15
TOTAL
1.0
1.20
2.05
2.65

12. Attachment System Weight Velco Strap Wide Tube Comfort 0.35 1 2
Durability
0.65 3
TOTAL
1.0
1.65
2.65

13. Future Work Purchase parts Create prototype
Create LabVIEW program to monitor temperature changes
Test prototype at sleep lab
Work with manufacturer to develop device

14. References
Dallas Center for Sleep Disorders. Pediatric Sleep Apnea. Retrieved from
Dept of Respiratory Care Eduation. KU Medical Center. Polysomnography. Retrieved from
Davey, Margot. The Royal Children’s Hospital of Melbourne. Sleep Studies. Retrieved from
Viasys Healthcare. SleepScreen. Retrieved from toennies.com/english/products/sleep- diagnostics/sleepscreening/sleepscreen/
Salter Labs. Growing Steadily on a Quality Foundation. Retrieved from
Rochester Sleep. Ultra Flow Respiration Monitors. Retrieved from

15. QUESTIONS???