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11022 Transcutaneous Signal Transmission for LVAD
February 18 , 2011Yevgeniy Popovskiy, Vince Antonicelli, Craig
LaMendola , Chrystal Andreozzi
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
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%
Big Picture Design
“Big Black Box”
LVAD
Skin
ICs
ICs
Motor Controller
Amplifiers
External Case
Internal Case
Electronics Function
SKINThe Big
Black Box
MCC + MCTMotor Controller
Amplifiers
Sensors
PAAS=>PADS
3
1
2
SA
Electronics Functionality Test
Outside PWBA
Inside PWBA
MCC Data from PWBA
SA Signals In (Bottom)and Out(Top from Set Up On Bread
Board
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
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
Flexibility Testing
Cable Current Cable
Designed Cable
Cable Diameter
8 mm 3.5 mm
Number of Wires
~40 10
Flexibility (N/cm)
1.43271 0.43831
•310% Increase in Flexibility•Cable diameter is 3.7 mm
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
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
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
Recommended