Transcript Final Design Review Presentation (SD II)

P08025 – LVAD Durability Test Machine
Project CARNA
Scott Carlson
Jim Cezo
Chris Dickens
Emily Berg
Tim Dovi
Suraj Jaisinghani
June Lee
Syung Lee
Ronan Mabiala
Jackie Sergi
Project Manager
Lead Mechanical Engineer
Lead Electrical Engineer
Mechanical Engineer
Mechanical Engineer
Computer Engineer
Computer Engineer
Industrial Engineer
Electrical Engineer
Mechanical Engineer
Sponsor – Dr. Don Olsen of the Utah Artificial Heart Institute
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P08025 – Background Information
• LVAD (Left Ventricular Assist Device)
– Provides congestive heart failure patients with a high quality of
life while waiting for a heat transplant (Bridge to Transplant)
• The LVAD-R2 is currently being developed at RIT
• CARNA is a tool to gain FDA Approval for an
Investigational Device Exemption (IDE) which will
allow the LVAD-R2 to enter Clinical Human Trials.
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P08025 – High Level Customer Needs
• Probability of failure < 2% over 2 years
• Run for 2 years uninterrupted with the following exceptions
– Critical signals may be lost for 24 hours (with proof of VAD normal
operation
– Non-Critical signals may be lost for 72 hours
• Allow multi-unit connection and operation (10 VAD Units)
• Measure the LVADR2’s performance
• Safely store VAD data
• Provide remote and local access to the data
• Allow non-invasive maintenance and / or emergency repair
• Cycle through average human activity on a schedule
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P08025 – Selected Mechanical Concepts
• Dual tank design
– Head tank to control pressure at LVAD inlet
– Sump tank to drain to atmospheric pressure
• Bypass system for non-invasive maintenance
– Replace failed sensors or valves
– Swap and re-validate sensors
• Interchangeable parts
• Mobile station / Wet dock
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P08025 – Mechanical System
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P08025 – Mechanical System
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P08025 – Bypass Loop
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P08025 – Bypass Loop
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P08025 – Selected Electrical Concepts
• Pump Test Module (PTM)
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Data acquisition
Measures a pair of VAD and flow loop signals
Controls flow characteristics
Single-fault tolerant data buffer
Listens for requests/commands from the DMC
• Data Management Center (DMC)
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Central data storage (MySQL)
Multi-master date replication
Remote access
Double-fault tolerant data storage
Off-site data storage
System health monitoring
• Power grid isolation
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PTM 1
VAD 2 Loop 2
PTM 2
VAD 3 Loop 3
PTM 3
PTM 4
PTM 5
VAD 6 Loop 6
PTM 6
VAD 7 Loop 7
PTM 7
VAD 8 Loop 8
PTM 8
VAD 9 Loop 9
PTM 9
VAD 10 Loop 10
PTM 10
Power Plant
Technician
Phone
SMS
Email
DMC
Node 1
Internet
VAD 5 Loop 5
Network Switch
VAD 4 Loop 4
Health Monitor
(HM) Notify
GSM Wireless
Network
VAD 1 Loop 1
DMC
Node 2
Off-site
Storage
Node 1
Off-Site
Storage
Node 2
Standby Generator
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P08025 – Data Management Center
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P08025 – Success of CARNA
• Both systems validated independently
– Not yet fully integrated
• Computer / Electrical
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Full system performance simulation
Burn-in test for computer components
Proper connection of wires
Valve control system
• Mechanical
– Leak test
– Maximum temperature of 88ºF
• 20º increase from ambient in 12 hours
– Maintain constant head
• Maintain head within ¼” of water under several operating
conditions
– Successful transition from main to bypass loops
– Air bleed test
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P08025 – CARNA Budget
• Initial Budget = $9,100
• Money spent to date = $8,500
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P08025 – Mechanical Pros and Cons
• Strengths
– 2 tank system
– Ability to maintain necessary head pressure
– Non-invasive maintenance
• Redundant loop
– Entire system is highly visible
• Weaknesses
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Interchangeable parts are mirror images
Flow directional parts
Over-the-side heater
No fail-safe for return line
No one-way valve on return line
Wet dock not easily serviceable
Need to remove bulk heads to remove tank from fixture
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P08025 – Electrical Pros and Cons
• Strengths
– Fault Tolerant
• Data acquisition
• Control and storage
– Secure
• Network isolation
• Encrypted transport
• Privilege based remote access
– Designed for Reliability
• Linux / National Instruments RTOS
• Simple control scripts
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Weaknesses
– Lack of 3rd party software support contracts
– Sensitivity to environment
– PC Hardware
• Spindled storage
• Power supply
• CPU fan
– RJ45 Connectors
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P08025 – Future Improvements
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Health monitoring system
User interface
Power plant
Fill size tank system with 10 modules
2nd return pump
– Fail-safe
• Inline water heater
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P08025 – Future Improvements
Salinity
Tank-less
Heating
Temp.
Level
Boolean
Flow
Submersible
Pump
Rotary
Pump
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P08025 Would Like to Thank:
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Dr. Steven Day
Dr. Daniel Phillips
Dr. Don Olsen
Tyler Oderkirk
Wayne Berg
Dr. Mark Kempski
John Wellin
Bill Finch
• Our Audience
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