1. Engineering World Health: Aspirator
Claire Flanagan: Leader Adam Rieves: Communicator
Mike Socie: BWIG Justin Lundell: BSAC
Advisor: Prof. Willis Tompkins Client: Dr. Robert Malkin, EWH, Duke University

2. Outline Design Matrix Future Work * Positive Displacement Pump
* Water Piston
* Turbine
* Venturi
* Aspirators in Clinical Settings
* Project Specifications
* Problem Statement
Previous Design
Design Matrix
Future Work

3. Aspirators in Clinical Settings
Remove bodily fluids
Critical in operating rooms and clinical care
Compact, powerful
-550 mmHg (gauge) at 26 L/min1
Expensive (>$300)
Require a technician to repair
1www.suctionunits.com/portable-suction-units.html

4. Problem Statement
Hospitals in developing world do not have functional suction apparatuses
Due to inability to maintain or power equipment
We must design a suction device to perform intrasurgically
Low maintenance
Low cost
Built entirely from locally available materials

5. Project Specifications
550 mmHg(gauge) vacuum
>10 L/min suction of air
Total cost <$100 USD
Receive power from 12 VDC battery
Entirely buildable from locally available materials
Simple assembly
Minimal, simple maintenance
Autoclavable suction tip & collection vessel
Compatible with manual backup

6. Previous Design Design Features Motor: car heater fan
Suction: piston-based
Radial to linear motion conversion
One-way valves define flow direction
Performance
76 mmHg (gauge) suction
1.5 L/min flow rate
$52.74

7. Positive Displacement Pump
Positive displacement traps air  physically removes it
Advantages
Effective vacuum formation
Can operate at very high speeds
Several types found in a car
Disadvantages
Requires good seals
Significant torque required
High engine speeds can damage parts

8. Automotive Transmission Pump
High Pressure Outlet
Low Pressure Inlet

9. Positive Displacement Pump
Positive displacement traps air  physically removes it
Advantages
Effective vacuum formation, high flow rate
Efficient energy transfer
Several types found in a car
Disadvantages
Requires good seals
Significant torque required
High engine speeds can damage parts

10. Turbine Advantages Disadvantages Material availability Compact
Low maintenance
Disadvantages
Limited suction
Motor cooling issues
High RPM
Poor energy transfer
Noise

11. Venturi Tube Operates under Bernoulli Principle
Dynamics of incompressible fluid flow through constricted vessel

12. Aspirator Collection Flask
Venturi Tube
Advantages
Efficient energy transfer
Pressure requirements
Flexible material selection
Disadvantages
Bulky OR integration
Some assembly required
Venturi may need to be fabricated
Upper Reservoir
Fluid Pump
Venturi Tube
Lower Reservoir
Aspirator Collection Flask

13. Positive Displacement Pump
Water Piston
Advantages
Few moving parts
Power efficient
Seal requirements
Disadvantages
Requires manual intervention
Bulky
No manual backup
Suction Tip
Collection Flask
Positive Displacement Pump
Air Release Valves
Tank 2
Tank 1

14. Positive Displacement
Design Matrix
Category
weight
Positive Displacement
Turbine
Venturi
Water Piston
Materials feasibility 20 14 18 17 12
Power Efficiency 15 11 10 13
Manual backup compatibility 5 3 4 1
Maintanance 8 9
Safety
Pressure/Flow 16
OR Integration (ergonomics) 2
Assembly
Cost
Total:
100 64 72 85 67

15. Future Work Design Develop venturi tube Select pump source Build
Tanks, tubes, valves
Pump, collection flask, tips
Test
Pressure/Flow
Battery Life

16. Engineering World Health
Developed through Duke University
“Meeting the healthcare technology needs of the world’s poorest”

17. Manual Backup Options
Bellows
Stationary Bike
Hand crank