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

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

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

Background Information Remove mucus and other bodily fluids Wide range of uses Liposuction Nasal Gastric Dental Endocervical Pediatrics Portable Battery or AC http://www.usemc.com/Allied-Gomco-OptiVac-G180-p/g180.htm

Current Devices Problems Expensive Specialized Not locally repairable http://www.mdsnq.com.au/products/212/140207130315.jpg

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

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

Major Areas of Improvement Vacuum source Check valves Hospital integration

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

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 http://img.alibaba.com/photo/51785400/Inner_Tube.jpg http://hydroclimes.co.uk/shop/images/10-485-005%2010cc%20Syringe.jpg

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

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

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

Hospital Integration Reduce size Cover Mobile On/off switch Pressure control http://25frames.org/media/screens/6617.jpg

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

References Aspirator suction machine., 2007, from http://www.medicalsupply4u.com/prodList.asp?idCategory=112&showFilter=0&idProduct=51 Electro surgery continuing education model. (2007). March 12, 2007, from http://www.valleylabeducation.org/esself/Pages/esself23.html Hill, D. (2005). Duke engineering program improves hospital conditions in developing countries. Retrieved 4/12, 2007, from http://www.dukenews.duke.edu/2005/09/DEWH.html

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