CPAP Remote Alarm System BME 272: Oral Report One Group 15 Kathleen Grunder Jessica Paulsen Molly Rice

Project Advisor Academic Advisor Dr. Roberta Leu - Clinical Instructor in the Sleep Disorders Division of Neurology, Vanderbilt University   Academic Advisor Dr. Paul King - Professor of Biomedical Engineering Emeritus, Professor of Mechanical Engineering Emeritus

Background Information Obstructive Sleep Apnea Most common form of sleep disorder breathing Results in partial or complete collapse of the upper airway Can lead to sleep deprivation, arrhythmia, high blood pressure, heart disease, stroke, or death Constant Positive Airway Pressure (CPAP) Therapy  Used to treat sleep apnea  Holds airway open with continuous flow of air  Effective when used correctly

Analysis Problem Statement Continuous Positive Airway Pressure (CPAP) machine masks often slip off during the night; this can be especially dangerous for children, who are not compliant with wearing the mask

Analysis Performance Criteria There is currently no alarm to alert parents when their child's CPAP mask has come off. Children are often not capable or willing to replace their mask when it comes off "I'm very nervous about knowing when [the mask] comes off because I realize how important it is to keep [my son's] airway open." - Dr. Judy Lewis

Analysis Primary Objective To develop a remote alarm system to be used to wake up parents when their child’s CPAP mask comes off in another room.

Hypothesis Solution Description To use a pressure or flow sensor to determine when the mask has slipped off and activate a remote alarm when the pressure or flow goes above the threshold May incorporate CO2 sensor

Hypothesis Goals To improve pediatric compliance with CPAP masks To prevent complications from apneas that can occur when the mask is not on To alert parents when the mask has come off To provide parents with comfort in knowing the mask is on

Hypothesis Factors The circuit components and complexity will most affect cost, accuracy, and quality.

Hypothesis Performance Metrics Sensitivity measurements How often does the machine sound when the mask is off? Functionality Does the alarm go off when the mask is off? Compliance Do parents and children use the alarm? Cost/Benefit Is the benefit worth the cost of the alarm? Alarm Volume Does the alarm wake up the parents? Receiver Range Can the reciever get the signal all over a house?

Progress Current Status Met with sales representatives from ResMed, a CPAP manufacturer Patent search Literature review

Progress Future Work Arrange meeting with Fisher Paykel, another CPAP manufacturer Continue research Brainstorm design ideas