11022 Transcutaneous Signal Transmission for LVAD

February 18 , 2011Yevgeniy Popovskiy, Vince Antonicelli, Craig

LaMendola , Chrystal Andreozzi

Introduction Design Test Results Successes Challenges Recommendations

Senior Design Review Agenda

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 Leak and Pressure Test Drop Test Flexibility Testing

Test Results

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

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