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

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

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

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

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

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

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

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

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

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

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

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

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

References Dallas Center for Sleep Disorders. Pediatric Sleep Apnea. Retrieved from http://www.dallas-sleep.com/pediatric-sleep-apnea.php Dept of Respiratory Care Eduation. KU Medical Center. Polysomnography. Retrieved from http://classes.kumc.edu/cahe/respcared/cybercas/sleepapnea/trenpoly.html Davey, Margot. The Royal Children’s Hospital of Melbourne. Sleep Studies. Retrieved from http://www.rch.org.au/sleep/studies.cfm?doc_id=5040 Viasys Healthcare. SleepScreen. Retrieved from http://www.jaeger- toennies.com/english/products/sleep- diagnostics/sleepscreening/sleepscreen/ Salter Labs. Growing Steadily on a Quality Foundation. Retrieved from http://www.salterlabs.com/ Rochester Sleep. Ultra Flow Respiration Monitors. Retrieved from http://www.rochestersleep.com/Respiration.htm

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