Elise Larson, Ali Johnson, Kim Kamer, Laura Zeitler

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Bronchoalveolar Lavage Trap

• Elise Larson, Ali Johnson, Kim Kamer, Laura
  Zeitler
• BME 201
• March 6, 2009

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• Client Dr. Christopher Green
• Dept. of Pediatrics
• School of Medicine and Public Health
• Advisor Prof. Brenda Ogle
• Dept. of Biomedical Engineering

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Overview

• Bronchoalveolar lavage
• Specimen trap problems
• Client requirements
• Possible prototype designs
• Future work
• Acknowledgments References

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Bronchoalveolar Lavage (BAL)

• Diagnostic procedure
• Alveolar hemorrhage
• Malignancies
• Infections
• Especially for immuno-
• compromised patients
• Equipment/Materials
• Bronchoscope
• Vacuum and light sources
• Saline solution
• Specimen trap

www.nytimes.com
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Problem and Current Solutions

• Problem
• Trap is free-hanging
• Risk losing sample
• Current Solutions
• Tape trap to scope
• Nurses can hold it

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Design Proposal

• Improve the current trap design to
  allowmanipulation of the bronchoscope without
  losing the sample.
• Specifications
• Plastic
• Must hold a 35 mL sample
• Volume gradations
• Cost effective (lt10)
• Durable (40 kPa vacuum pressure)

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Design Option 1 Fixed Long Distance

• Pros
• Cost effective
• Simple
• Feasible

• Cons
• Unlikely to be accepted
• Out of view
• Not necessarily universal

to Light Source
Vacuum, Trash Trap, Specimen Trap
to Patient
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Design Option 2 Ball-and-Socket Frame

• Pros
• Reusable
• Universal
• Cons
• Less likely to be accepted
• Cumbersome
• High prototype cost

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Design Option 3 Ball in Cage Valve

• Attachment to original trap

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Ball in Cage Valve

• Pros
• Universal
• Likely to be implemented
• Not cumbersome

• Cons
• Prototype cost
• Difficult to make

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Design Matrix
Weight Design Aspects Fixed Long distance Ball-and-socket Ball in Cage
0.05 Prototype Cost 8 4 6
0.2 Mass Production Cost/ Procedure 8 9 5
0.05 Continuity 3 8 10
0.2 User Friendly 3 8 10
0.2 Feasibility 10 7 8
0.05 Acceptability among M.D.s 3 3 10
0.2 Dependability 8 9 10
0.05 Cumbersome 8 4 10
1 TOTAL 6.9 7.6 8.4
Scale 1 10 (1 poor, 10 excellent)
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Future Works

• Determine design details
• Order materials
• Assemble prototype
• Extensive testing and adaptation
• Finalize prototype

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References
Acknowledgements

• Christopher Green, MD
• Professor Ogle

• Prakash, Udaya, Mehta, Atul, Shepherd Wes.  "The
  Art of Bronchoscopy." Bronchoscopy International
  Art of Bronchoscopy, an Electronic On-Line
  Multimedia Slide Presentation http//www.bronchosc
  opy.org/ppt-art/AB-2A/AB-2a_files/frame.htm
• Dugdale, D.C., Medoff, B. Bronchoscopy. Medline
  Plus. Nov 4, 2008. Viewed on Feb 1, 2009.
  http//www.nlm.nih.gov/medlineplus/ency/article/00
  3857.htm

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Questions?