Doser x100 Accessible Syringe Dosing Device Team #1 Bob Mock Gabe Goldman Megan Bowers Karen Young University of Connecticut Biomedical Engineering April 29, 2005

Statement of Need Intravenous medication necessary for many diseases and disorders Self-dosing problematic for those with impaired vision, hearing, motor skills

Objective This instrument is a syringe-dosing apparatus used to measure and mix insulin or heparin before injection. Accurate to the nearest 0.01cc. Microprocessor-controlled digital display.

Doser x100 Clients Insulin/Heparin dependent Type 2 diabetes, strokes/heart attacks, Parkinson’s disease, tremors Blind and hearing impaired Minimal physical exertion

Market Research Several products currently on the market: –Count-A-Dose by Medicol: $59.95 –Load-Matic by Palco Labs: $49.95 –The Syringe Support by the Foundation Center Louise-Herbert: $19.95 All three devices are difficult for use by those with poor motor skills. None of the devices have a digital display.

Preliminary Designs Our team fully documented three designs before choosing an optimal design Design I: Motor and gears, logic circuit Design II: Ball-screw and stage, motor Design III: Ball-screw, microprocessor

Doser x100 Design aspects –Case Design –User Interface –Electronics Conclusion

User Interface Microprocessor Power Supply Driver LCD Display Syringe Dosing Project Block Diagram Linear Actuator Syringe

User Interface LCD display Braille Keypad Help option Text-to-speech Pictures not to scale

Case Design Plexiglas Mounting of all components: – power supply, linear actuator, driver, PCB board, syringe, and bottles. 12x8.5 inches Saw, mill, drill press

Electronics Captive Linear Actuator –Motor rotates to pulls screw –Actuator piston does not spin –High force, long length, small resolution per step ( ”) Driver –24 volts –Simplifies design – 2 inputs –Direction input - high pulls back actuator and low pushes it forward –Clock pulse input – runs actuator in addition to controlling speed by frequency of pulse

Electronics PCB board – The schematic diagram of the entire project is designed first. –The PCB is designed with connections to incoming devices optimized for easy setup. –The schematic links to PCB to check for errors.

Microprocessor PIC16F874A – 40 pin dip Accepts data from the user interface. Outputs data from user to LCD display. Programmed in C++ and converted into assembly code Accepts inputs from keypad using strobe inputs 4x4 matrix – Pulses are strobed through pins 1-4 of the keypad and then read from pins 5-8

Budget DateCompany Cost ($) 1/7/05Jameco /12/05 Maxi Aids /17/05Digi-Key /21/05Jameco8.47 1/25/05 Mansfield Supply /24/05 Haydon Switch /01/05 Mansfield Supply /22/05 US Digital /18/05 Mansfield Supply /7/05Jameco /25/05Digi-Key /25/05Jameco /25/05 Hooleon Corp /25/05 Images SI /25/05 Mansfield Supply /1/05Tsop-adapter.com /1/05Acroname /8/05 Stop & Shop /15/05Jameco /15/05PCB53.45 TOTAL

Conclusion Product is unique due to: –Accessibility to those with poor motor function –Digital user interface –Electrical and mechanical interfaces

Acknowledgements Dr. Enderle Chris Liebler Serge and Rich Tracy Makuch Haydon Switch and Instruments (HSI) The National Student Design Contest, funded by the Rehabilitation Engineering Research Center on Accessible Medical Instrumentation

Questions ?