1. Engineering World Health: Aspirator
Client & Advisor: Dr. John Webster
Lucas Vitzthum - Team Leader
Fan Wu - BSAC
Nick Harrison - Communications
Jonathan Meyer - BWIG

2. Outline Problem Statement Background Design Specifications
Previous Design
Improvements
Vacuum source
Check valves
Hospital integration
Future Work

3. Problem Statement Medical Aspirator 3rd World Application
Limited power
Locally available parts/expertise
Inexpensive
Clear Instructions

4. Background Information
Remove mucus and other bodily fluids
Wide range of uses
Liposuction
Nasal
Gastric
Dental
Endocervical
Pediatrics
Portable
Battery or AC

5. Current Devices Problems Expensive Specialized Not locally repairable

6. Design Specifications
Locally available materials
<$100
Autoclavable suction tips
Vacuum pressure: 0 – 550 mmHg
Flow rate: 0 – 30 Lpm
Sterile and safe

7. Previous Design 12v Battery Fan Motor String Lab Glove Diaphragm
Collection Chamber
Autoclavable Tip

8. Major Areas of Improvement
Vacuum source
Check valves
Hospital integration

9. Piston Design
Transform the rotational kinetic energy to linear kinetic energy
(½ I ω^2 to ½ mV^2)
Improvement from original prototype: rigid arm over string

10. Vacuum Source Design Rubber diaphragm Syringe Inner tube
Thicker, therefore more stable and durable
Syringe
Adjustable and consistent vacuum
Can be hard to push by the piston

11. Valve Design Last semester’s valves Problems This semester
Sphignomonometer valve
One balloon valve
Problems
Cost
Efficiency
This semester
Develop an efficient, inexpensive valve made from locally available materials

12. Valve Design Three design alternatives Ball Valve Single Flap Valve
Double Flap Valve
Made from a funnel and a marble
Made from a can lid
and rubber from a bicycle inner tube
Made from a can lid
and rubber from a bicycle inner tube

13. Valve Design Probable design: Single flap valve Easiest to build
Can be constructed inside and outside a pipe

14. Hospital Integration Reduce size Cover Mobile On/off switch
Pressure control

15. Future Work Build and test prototype EWH Building instructions
Construction pictures
Testing instructions
Operating instructions

16. References
Aspirator suction machine., 2007, from
Electro surgery continuing education model. (2007). March 12, 2007, from
Hill, D. (2005). Duke engineering program improves hospital conditions in developing countries. Retrieved 4/12, 2007, from

17. Any Questions?