man’s quest for immortality: simulation of an implantable cardioverter defibrillator

Man’s Quest for Immortality:

Simulation of an Implantable Cardioverter Defibrillator

ME 224 Final Project

Andrik Cardenas John FoglesongMonica Koepnick Jon Moncton

December 12, 2001

Presentation Agenda

ObjectivesBackgroundProgram LogicResults/

ExampleConclusionQuestions

Objectives

ME Curriculum Objective: Understand and apply in-class teachings to

world around us to create solutions to everyday problems.

Final Project Objective: Create a simplified, yet realistic, ICD simulator

using LabVIEW to compare a heart rate in question with the appropriate range as determined from user-defined variables.

What is an ICD?

Purpose: Prevent ventricular

fibrillation by monitoring heart rate and delivering precisely calibrated shocks to control abnormal heart rates

Physical Structure Size Materials

What is an ICD?

88 mm

63 mm

How does an ICD work?

Pacingbrief bursts of impulses to heart muscle at

faster than normal pace

Low-Energy Cardioversionmild shocks of 0.5-2.0 Joules to break

abnormal rhythm

Defibrillationintense shocks of 30 Joules to stop

ventricular fibrillation

Simulation of an ICD

Key Considerations: Controllable patient characteristics

AgeActivity Level

Definition of healthy heart ratesActivity Level

Maximum Heartbeat (beats/min)

Minimum Heartbeat (beats/min)

High 220 – Age 100

Medium 60% of Max 80

Low 85 60

Program Logic

Key Components User Inputs Signal Manipulation and Comparison Program Outputs to User

Program Logic—User Inputs

Key Components Age Activity Level Initial Heart Rate

Program Logic—Signal Manipulation and Comparison

Read current frequencyCompute upper and lower

boundariesCompare current frequencyDetermine if “shock” is necessary

Program Logic—Program Output to User

Shock, if necessaryShow current heart rateDetermine LED outputGraph progress of heart rate

Results

It works!Simulation Example

Lab Feasibility

Main ObjectiveLengthProgram ComplexityDifficulty of Lab Handout

The Future of ICDs

MiniaturizationTransition from

conventional electronics

Artificial heart replacement

Conclusion

Conceptual OverviewUtilized LabVIEW CapabilitiesReplacement of Conventional

Electronics

Questions?

JohnnyMonica

Jon

Andrik