Engineering World Health: Aspirator Client: Dr. John Webster Advisor: Paul Thompson Team Lucas Vitzthum - Team Leader Fan Wu - BWIG Nick Harrison - Communications Tyler Lark - BSAC

Outline Problem Statement Background Existing Devices Design Specifications Design Ideas Design Matrix Future Work

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

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

Current Devices Brands Problems Gomco (Allied Medical) Res-Q-Vac Apria Many! Problems Expensive Specialized Not locally repairable

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

General Setup Autoclavable tip Collection chamber Vacuum source

Water Hourglass Water flow from top to bottom Venturi effect 360 degree rotation

Pros and Cons Pros Cons Simple setup Parts easily obtainable Water available in 3rd world hospitals Inexpensive Cons Weak vacuum Obstructs operating room environment

Foot Pump Mechanical Human powered Pair of one-way valves Two-stage system Compression Restitution

Foot Pump Advantages: Disadvantages: Inexpensive Man-powered (Independent of electricity) Easily replaceable Disadvantages: Weak vacuum Inconsistent airflow Physically demanding

Electric Vacuum Pump Design Salvaged Electric Motor Conversion to linear ossilations Contractions of Diaphram One way valves 12V car battery

Vacuum Pump (cont.) Pros Cons Reliable, continuous vacuum Versatile Complicated design Difficult to build Reads multiple Pressures,,, more versitile cons can’t use spring

Design Matrix Foot Pump Water Hourglass Electric Pump 7 8 4 9 5 2 1 3 Power Availability (10) 7 8 4 Construction Resources (10) 9 5 Pressure (10) 2 Hospital integration (5) Reliability/ Safety (10) 1 Cost (5) 3 Total 28 30 33

Future Work Design an airflow control Finalized design Acquire materials for a prototype Build Test

Any Questions?