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UW-Madison BME 300 - Sleep Lab Monitor

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Sleep Lab Monitor - Progress Report 13 11/28/08-12/5/08 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 End Tidal 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 the 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. 1Reinstatement of Team Goals from Last Week: 1. Finish the prototype a. Finish heat shrinking the wires onto the cannula b. Add the GrassLead connectors to the thermistor wires 2. Install LabView on a laptop to use for the presentation 3. Client Meeting 4. Work on the final presentation 5. Finish poster 6. Give presentation Summary of Team Accomplishments: 1. Attachment System – After adding the heat shrink to enclose the thermistor wires, the tubes became too large for the diameter of one of the attachment devices a. Heat the tube more to shrink it down further i. This shrunk it down a little, but not enough b. Cut the attachment piece by hand for a bigger diameter i. This turned out to be very difficult ii. Small cuts and progress were made however 2. Surface mount thermistors a. Proved to not be very durable b. Broke in half, and came unsoldered quite often c. Decided in order to make a durable prototype to switch thermistors 3. Redid entire prototype with beaded thermistors a. These thermistors are much more durable b. Much easier to solder by hand c. For the future, we will look into using a smaller thermistor 4. LabView was installed on a Laptop a. However, the cord to plug the ELVIS into the laptop could not be located b. Thus, we will have to use a desktop from the lab with the ELVIS c. Therefore, we have obtained a licensing code from the company to use the software 5. GrassLead connectors a. If we connect the GrassLead connectors to the prototype now, we will be unable to plug the thermistors into our circuit and into the ELVIS b. Thus, using the GrassLead connectors will have to wait for future work until we test the prototype in the sleep lab 6. Continued to write paper 7. Completed poster 8. Split up the presentation among group members 9. Obtained screen shots of sleep lab from Dr Green to use during the presentation 10. Went to the client meeting a. Discussed final prototype and presentation b. Discussed where to go from here 11. Will give presentation on 12/5/08 at 12:41 PM 2Statement of Team Goals for Upcoming Week 1. Finish Paper 2. Complete Notebooks 3. Attend last advisor meeting 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. Getting surface mount thermistors to be durable enough to use with the prototype 2. Having to switch thermistors this late in the project 3. Figuring out how to use the ELVIS and LabView during the presentation Expenses: 1. Surface mount thermistors 15 X $0.239/ea = $3.59 2. Lacquer coated thermistor disks 10 X $0.51/ea = $5.10 3. Bead/pearl shaped, ethoxyline resin coated thermistors 10 X $0.333/ea = $3.33 4. Other disk thermistors 10 X $0.277/ea = $2.77 5. Surface mount coin shaped thermistors 10 X $0.21/ea = $2.10 6. Heat shrink 1/8 IN X 4FT clear 8 ft for $2.16 7. Heat shrink 1/4 IN X 4FT clear 8 ft for $3.26 8. Heat shrink 3/16 IN X 4FT clear 8 ft for $2.62 Total thus far = $24.93 34 Activities and Individual Accomplishments: Team Meeting 12/1: 2 hours Worked on the final poster Team Meeting 12/3: 5 hours Replaced thermistors on prototype Tested the prototype Client Meeting 12/3: 1 hour Team Meeting 12/4: 2 hours Went over final presentation Practiced our parts as a team Setting up for final presentation 12/5: 2 hours Final Presentation 12/5: 2 hours Nicole – 7 hours: Replacing thermistors, poster & presentation work, attempting to obtain a mannequin head Jack – 7.5 hours: Replacing thermistors, cutting the attachment piece, progress report, poster & presentation work Lindsey – 7 hours: Testing the prototype, getting the LabView licensing, poster & presentation work Robyn – 7.5 hours: Updated website, took the final poster to be printed, testing prototype, poster & presentation work Total hours for this week: 44 hrs Cumulative hours to date: 291.5 hrsSleep 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


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UW-Madison BME 300 - Sleep Lab Monitor

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