1. 11022 Transcutaneous Signal Transmission for LVAD February 18, 2011 Yevgeniy Popovskiy, Vince Antonicelli, Craig LaMendola, Chrystal Andreozzi

2.  Introduction  Design  Test Results  Successes  Challenges  Recommendations Senior Design Review Agenda

3.  The Left Ventricular Assist Device (LVAD) is a electro mechanical circulatory device designed to assist a patient with a failing heart. Typically, a patient will receive one for temporary use after a heart attack or major heart surgery.  Eliminate as many transcutaneous wires as possible running from the external battery and controller to the LVAD. Project Background

4.  The device must be reliable  The number of wires needs to be reduced  The cable diameter needs to be reduced  The cable needs to be more flexible Customer Needs and Engineering Specifications THE SYSTEM NEEDS TO WORK!!!!  Must Operate Reliably for 6 hours  Cable Size Reduced to 3- 4mm  Improve Cable Flexibility by 200%

5. Big Picture Design “Big Black Box” LVAD Skin ICs Motor Controller Amplifiers External Case Internal Case

6. Electronics Function SKIN The Big Black Box MCC + MCT Motor Controller Amplifiers Sensors PAAS=>PADS 312 SA

7.  Electronics Functionality Test  Leak and Pressure Test  Drop Test  Flexibility Testing Test Results

8. Electronics Functionality Test Outside PWBA Inside PWBA MCC Data from PWBA SA Signals In (Bottom)and Out(Top from Set Up On Bread Board

9.  Both cases were drop tested with boards inside  Cases sealed with o rings  Boards mounted with thermally conductive foam  External case had neoprene cover installed  Both cases dropped 3 times from 1 meter height  No damage observed to cases or electronics Drop Test

10.  Both cases were sealed only with o ring cords  Silicone sealant not used for testing  Sections of actual cables installed in cord grips  Cases were sealed, tested, and examined three times  Tested under.75 meters of water for 90 minutes  Tested under running water for 15 minutes  Cases confirmed water tight under pressure Leak and Pressure Test

11. Flexibility Testing CableCurrent Cable Designed Cable Cable Diameter 8 mm3.5 mm Number of Wires ~4010 Flexibility (N/cm) 1.432710.43831 310% Increase in Flexibility Cable diameter is 3.7 mm

12.  Time restraint on Debug Electrical System  Timely Coordination of information exchange  Major design changes from concept to finial design  Communication  Coordinating with the other team Challenges

13.  Cases easily past testing requirements  Cable diameter was reduced and flexibility increased  Successfully utilized breadboard as a cost efficient prototyping tool  Got breadboard to function properly Successes

14.  Combining all electronics used in project 11022 and project 11021  Reduce physical size of internal and external electronics by combining all internal electronic components into one compact design  Use the same tool form the simulation and finial electronics layout (example PADS) Recommendations