1 Sleep Lab Monitor - Progress Report 4 9/27/08-10/03/08 Project Title: A combined Thermistor, Pressure, and CO2 device for use in the Sleep Laboratory Team Members: Jack Page – Team Leader [email protected] Nicole Daehn – Communicator [email protected] Lindsey Carlson – BSAC [email protected] Robyn Hrobsky – BWIG [email protected] Client: Christopher G. Green, MD Dept of Pediatrics School of Medicine and Public Health [email protected] 608.263.9608 Advisor: Willis Tompkins Dept. of Biomedical Engineering University of Wisconsin - Madison [email protected] 608.263.1581 Problem Statement: There are three measurements taken from each breath during polysomnography. The following devices are used: a thermistor to detect temperature difference between inhaled and exhaled air, pressure sensors that show a flattening pressure profile during upper airway narrowing, and CO2 sampling tubes to sense exhaled CO2. These three measurements are taken from two different devices placed under the child’s nose, with two prongs going into each nostril. This method can be inaccurate if a nostril was to become obstructed, and each device may not sample from both nostrils as well as the2 mouth. Moreover, the current apparatus may be uncomfortable for the child as well as insecure on the child’s face. This could cause a disruption of sleep and a possibility of the devices becoming unfastened during the night. To solve these problems, the goal is to design and develop a prototype that combines these three measuring devices into one apparatus that samples from both of the nostrils as well as the mouth, and attaches to the child in both a durable and comfortable fashion. Summary of Team Accomplishments: 1. Brainstormed potential design ideas 2. Discussed the ideas with Dr. Green 3. Received many answers to burning questions during the client meting 4. Completed second draft of Project Design Specifications 5. Received more cannulas to inspect and possibly cannibalize 6. Met with Professor Webster and Amit Nimunkar 7. Did a bioinstrumentation lab on thermistors 8. Tested a device we received from the sleep lab that we thought was a thermistor (it turned out not to be) 9. Tested an actual thermistor and examined the resistance change while breathing on it Statement of team goals: 1. Further discuss ideas among group and combine best parts of ideas to come up with different overall designs 2. Do research on specifications and ordering thermistors 3. Decide on what type of thermistor we would like to use 4. Come up with design alternatives and begin design matrix Project Schedule 9/5/08 – 9/12/08: Choose team and project, Meet Client, Get specifications for project 9/13/08 – 9/19/08: Develop PDS, Perform background research 9/20/08 – 9/26/08: Background research, preliminary design ideas 9/27/08 – 10/3/08: Continue to brainstorm for ideas 10/4/08 – 10/10/08: Work on design and choose design alternatives 10/11/08 – 10/17/08: Complete Mid Semester Presentations 10/18/08 – 11/27/08: Develop final design and complete prototype 11/28/08 – 12/12/08: Complete and give Final Presentation, submit notebooks and paper Team Difficulties: 1. No significant difficulties this week.3 Activities and Individual Accomplishments: Advisor meeting 9/26: 1 hour Meeting with Prof Webster 9/26: 1 hour Talked about thermistors Team Meeting 9/29: 2 hours Regarding design ideas, etc Advisor meeting 9/30: 1.5 hours Spoke more regarding design and specifications Lab meeting with Amit Nimunkar 9/30: 1.5 hours Did thermistor lab Other: Nicole – 2.5 hour: Edit PDS, Research, ideas for design Robyn – 2 hour: Research, brainstorming ideas Jack – 2 hour: Progress report, brainstorming design ideas Lindsey – 2 hour: Research ideas, brainstorming Total hours for this week: 15.5 hrs Cumulative hours to date: 64.5 hr4 Sleep Lab Monitor Gantt Chart Fall 2008 Completed: In Progress/Planned: 9/5 9/12 9/19 9/26 10/3 10/10 10/17 10/24 10/31 11/7 11/14 11/21 11/28 12/5 12/12 Propose project Background research Client Meetings Meetings with Professors/Techs Develop PDS Brainstem design ideas Design alternatives/matrix Midsemester presentation Finalize design ideas Order materials Construct prototype Test prototype Plan final poster presentation Write final paper Final advisor
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