DOC PREVIEW
UW-Madison BME 200 - Final Report - Peak Inspiratory and Expiratory Flow Meter

This preview shows page 1-2-22-23 out of 23 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 23 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 23 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 23 pages.
Access to all documents
Download any document
Ad free experience
View full document
Premium Document
Do you want full access? Go Premium and unlock all 23 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 23 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

Peak Inspiratory and Expiratory Flow Meter BME 200/300 University of Wisconsin - Madison December 7, 2005 Team: Darshan Patel, BSAC Andrew Eley, Team Leader Sarah Offutt, Communications Eric Bader, BWIG Client: Christopher Green, MD Pediatric Pulmonology UW Hospital Advisor: Professor John Webster Department of Biomedical Engineering University of Wisconsin2Table of Contents ABSTRACT................................................................................................................................................... 3 PROBLEM STATEMENT ............................................................................................................................ 3 BACKGROUND............................................................................................................................................ 3 DESIGN CONTRAINTS............................................................................................................................... 6 ALTERNATIVE DESIGN 1 (DOUBLE BARREL) ..................................................................................... 7 ALTERNATIVE DESIGN 2 (TASER).......................................................................................................... 8 PROPOSED DESIGN 3 (SNIPER)................................................................................................................ 9 FINAL DESIGN........................................................................................................................................... 13 TESTING AND CALIBRATION................................................................................................................ 16 FUTURE WORK ......................................................................................................................................... 18 CONCLUSION............................................................................................................................................ 19 REFERENCE............................................................................................................................................... 20 APPENDIX A .............................................................................................................................................. 21 APPENDIX B............................................................................................................................................... 233Fig 1. Common causes of asthma (Green Island Graphics, 2004)Abstract A device for measuring both peak inspiratory and expiratory air flows in a single device is desired. Currently, it is common to monitor and diagnose asthma by periodically measuring peak expiratory flow. Vocal chord dysfunction is a disease that is often misdiagnosed as asthma but cannot be cured by asthma treatments. To monitor and diagnose for vocal cord dysfunction, peak inspiratory flows are measured. The final design must be cheap, lightweight, and easy to carry around. Three design ideas are presented but only one will be pursued. Future work entails additional research, design improvements, and further testing and calibration. Problem Statement The proposed project is to create a peak inspiratory and expiratory flow meter as a single device. Peak expiratory flow meters are used to monitor asthma and measure flows of about 700 liters per minute. Doctors sometimes misdiagnose vocal chord dysfunction, narrowing of the airways at the vocal chords during inspiration, as asthma. Peak inspiratory meters are used to monitor and diagnose vocal chord dysfunction. Having a peak inspiratory and expiratory flow meter in one device can help prevent a misdiagnosis of a patient’s condition. Our device will measure the peak flow at which a person can inhale and exhale air. Background Asthma occurs in the lower airways, from the trachea down to the alveoli (air sacs). Asthma is an expiratory problem, caused by a narrowing of the airways and an increase of airway resistance. There are three common causes of asthma, pictured in Figure 1. The muscles surrounding the bronchial tubes can tense causing the airways to contract. Another cause is the inflammation and swelling of the bronchial tube lining. The third cause is4excess mucus production which fills the airway leaving a small opening for air to pass. Asthma typically occurs in episodes following exposure to triggers such as exercise, cold, or substances in the air (Framingham School, 2005). Asthma is a common condition which is easy to treat and monitor. There are two measures taken to treat asthma, medication for long term effect and medication for quick response. Long term asthma medications, called anti-inflammatory agents reduce the swelling and sensitivity to triggers. This medication is taken daily. Quick response medications, called bronchodilators act principally to open the airways by relaxing bronchial muscle (American Lung Association, 2005). In order to monitor asthma, doctors prescribe the use of a peak expiratory flow meter. Vocal cord dysfunction occurs in the upper airway, specifically the larynx. A person with vocal cord dysfunction usually experiences difficulty inhaling. Vocal cord dysfunction occurs when the vocal cords do not open and close properly during breathing or speech (Allen, 2002). Typically this occurs during exercise or nervousness. Since the symptoms (wheezing, and coughing) are similar to those of asthma, vocal cord dysfunction gets misdiagnosed as asthma. Treatment for vocal cord dysfunction is speech therapy. One way for doctors to diagnose this correctly is to measure peak inspiratory flow. Multiple designs of peak expiratory flow meters are on the market today, whereas only a couple of inspiratory flow meters are available. Peak expiratory flow meters are designed to help diagnose and monitor asthma. All of the expiratory flow meters are similar in internal design but vary in outward appearance. The internal structure consists of a thin plate or plunger attached to a spring. The plunger pushes up a lightweight5Fig. 2 Current flow meters plastic indicator that corresponds to a flow rate in liters per minute. The force exerted by exhaling moves the spring and plate. Along the side of the incremental ruler, are three colored arrows. These arrows correlate to different zones and are specific to the user. If user measures above the green they are in the controlled zone. Below


View Full Document

UW-Madison BME 200 - Final Report - Peak Inspiratory and Expiratory Flow Meter

Documents in this Course
Load more
Download Final Report - Peak Inspiratory and Expiratory Flow Meter
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Final Report - Peak Inspiratory and Expiratory Flow Meter and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Final Report - Peak Inspiratory and Expiratory Flow Meter 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?