1. Bronchoalveolar Lavage Trap
Elise Larson, Ali Johnson, Kim Kamer, Laura Zeitler
BME 201
March 6, 2009

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

3. Overview Bronchoalveolar lavage Specimen trap problems
Client requirements
Possible prototype designs
Future work
Acknowledgments & References

4. 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

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

6. Design Proposal
Improve the current trap design to allow manipulation of the bronchoscope without losing the sample.
Specifications
Plastic
Must hold a 35 mL sample
Volume gradations
Cost effective (<$10)
Durable (40 kPa vacuum pressure)

7. 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

8. Design Option 2: Ball-and-Socket Frame
Pros
Reusable
Universal
Cons
Less likely to be accepted
Cumbersome
High prototype cost 8

9. Design Option 3: Ball in Cage Valve
Attachment to original trap

10. Ball in Cage Valve Pros Cons Universal Likely to be implemented
Not cumbersome
Cons
Prototype cost
Difficult to make 10

11. 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 9 5
Continuity 3 10
User Friendly
Feasibility 7
Acceptability among M.D.s
Dependability
Cumbersome 1
TOTAL
6.9
7.6
8.4
Scale: 1 – 10 (1 poor, 10 excellent)

12. Future Works Determine design details Order materials
Assemble prototype
Extensive testing and adaptation
Finalize prototype

13. Acknowledgements References 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
Dugdale, D.C., Medoff, B. “Bronchoscopy.” Medline Plus. Nov 4, Viewed on Feb 1,

14. Questions?