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P08025 – LVAD Durability Test Machine - PowerPoint PPT Presentation


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P08025 – LVAD Durability Test Machine. Project CARNA. Scott Carlson Project Manager Jim Cezo Lead Mechanical Engineer Chris Dickens Lead Electrical Engineer Emily Berg Mechanical Engineer Tim Dovi Mechanical Engineer Suraj Jaisinghani Computer Engineer

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slide1

P08025 – LVAD Durability Test Machine

Project CARNA

Scott Carlson Project Manager

Jim Cezo Lead Mechanical Engineer

Chris Dickens Lead Electrical Engineer

Emily Berg Mechanical Engineer

Tim Dovi Mechanical Engineer

Suraj Jaisinghani Computer Engineer

June Lee Computer Engineer

Syung Lee Industrial Engineer

Ronan Mabiala Electrical Engineer

Jackie Sergi Mechanical Engineer

Sponsor – Dr. Don Olsen of the Utah Artificial Heart Institute

slide2

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.

P08025 – Background Information

slide3

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

P08025 – High Level Customer Needs

slide4

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
slide9

P08025 – Selected Electrical Concepts

  • Pump Test Module (PTM)
    • 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)
    • 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
slide10

VAD 1

Loop 1

PTM 1

Network Switch

Health Monitor

(HM) Notify

GSM Wireless

Network

Technician

VAD 2

Loop 2

PTM 2

Phone

VAD 3

Loop 3

PTM 3

SMS

VAD 4

Loop 4

PTM 4

Email

VAD 5

Loop 5

PTM 5

DMC

Node 1

Internet

Off-site

Storage

Node 1

VAD 6

Loop 6

PTM 6

VAD 7

Loop 7

PTM 7

VAD 8

Loop 8

PTM 8

DMC

Node 2

Off-Site

Storage

Node 2

VAD 9

Loop 9

PTM 9

VAD 10

Loop 10

PTM 10

Power Plant

Standby Generator

slide12

P08025 – Success of CARNA

  • Both systems validated independently
    • Not yet fully integrated
  • Computer / Electrical
    • 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
slide13

P08025 – CARNA Budget

  • Initial Budget = $9,100
  • Money spent to date = $8,500
slide14

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
    • 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
slide15

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
  • Weaknesses
    • Lack of 3rd party software support contracts
    • Sensitivity to environment
    • PC Hardware
      • Spindled storage
      • Power supply
      • CPU fan
    • RJ45 Connectors
slide16

P08025 – Future Improvements

  • Health monitoring system
  • User interface
  • Power plant
  • Fill size tank system with 10 modules
  • 2nd return pump
    • Fail-safe
  • Inline water heater
slide17

Salinity

Temp.

Tank-less

Heating

Level

Boolean

Flow

Submersible

Pump

Rotary

Pump

P08025 – Future Improvements

slide18

P08025 Would Like to Thank:

  • Dr. Steven Day
  • Dr. Daniel Phillips
  • Dr. Don Olsen
  • Tyler Oderkirk
  • Wayne Berg
  • Dr. Mark Kempski
  • John Wellin
  • Bill Finch
  • Our Audience