the lucina system project proposal timothy bachman garrett grindle leigh mcclure scott morley...
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The Lucina SystemPROJECT PROPOSAL
Timothy BachmanGarrett GrindleLeigh McClureScott Morley
University of PittsburghSenior Design - BioE1160
Lucina Medical
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Overview• The practice of fetal heart surgery to correct
congenital heart defects has been limited by the lack of a fetal CPB system.
• It is believed that if congenital heart defects are corrected early, that blood flow patterns can be restored and the heart will develop normally.
• There is an extremely small demand for a fetal CPB system – probably 100’s of cases per year.
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Overview (cont)• This group will design a fetal cardiac bypass
system comprised of:
• Pump
• Venous and arterial cannulas
• Controller, Pressure and Flow Sensors
• Existing pumps are being evaluated for suitability
• Cannulas will be purchased and modified if necessary
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Lucina (Latin): Roman Goddess of Childbirth
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Project Goals
• Develop a working prototype of a fetal CPB system which fulfills the requirements of the PDS.
• Evaluate prototype in a mock loop.
Design complete March 12, 2004
Prototype complete April 6, 2004
Testing complete April 12, 2004
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Features & Benefits (projected)
Features Benefit
Complete fetal cardiac bypass capability
Permits open heart surgery on fetuses for the correction of congenital defects
Low priming volume
Eliminates hemodilution. Reduces blood contact with foreign SA.
Pulsatile flow Reduces placental dysfunction.
Variable flow rate Accommodates patient’s perfusion needs.
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Product Description (projected)
NOT TO SCALE
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Design Alternatives
• Pump
• Currently evaluating a pediatric centrifugal blood pump
• Concept for bladder-style pump has been proposed
• Cannulas
• Commercially available cannulas will be sought
• Custom cannulas are possible
• Sensors
• Commercially available pressure and flow sensors will be sought
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Competitive Analysis
• Research Competitors
• Stanford/UCSF group (one case w/ J&J’s pump)
• Commercial Competitors
• Blood pump companies: J&J, Medtronic, Cobe, etc
• No competing commercial products at this time
• Strengths and Weaknesses vs. Stanford/UCSF’s Group
• Stanford has not published their work. Our competitive advantage or disadvantage has not yet been determined.
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Technology
• Current pump design technology will be considered.
• Miniaturization of existing concepts will be considered.
• A novel pump design has been proposed and will be evaluated.
• Solid modeling and computational fluid dynamics will be utilized throughout the design process.
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Team/Resources• People
• Design Team: Wide variety of backgrounds including electronics, mass transport, flow visualization, and biomechanics.
• Dr. Frank Pigula, Pediatric Cardiothoracic Surgeon – Boston Children’s Hospital: Offers medical and end user advice.
• Mark Gartner, Instructor, BioE 1160: Offers engineering expertise and material resources.
• Sarah Wright, Engineer, Ension: Offers pump evaluation and design advice.
• Department of Bioengineering: Offers design space, equipment, and funding.
• School of Engineering: Offers prototyping and machining facilities.
• Limitations
• Time – Schedule is very tight, especially if pump design is required.
• Funding is limited.
• Experience of team members.
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Current Status• Completed analyses/documents:
• PDS
• Function Means Analysis
• Object Tree Analysis
• Human Factors Plan
• Initial Hazard Analysis
• Project Schedule
• Met with Dr. Pigula regarding design specifications.
• Began preliminary analysis of Nimbus Pump
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Schedule and Milestones• Conceptual Design Complete:
1/17/04• Choose pump
• Cannula size and insertion sites
• Determine console requirements and electrical safe guards
• Primary Design Complete: 2/21/04• Apply engineering model to
determine dimensions
• Determine Specific Components
• Preliminary drawing and parts list
• Design Refinement Complete: 3/13/04• Integrate components
• Manufacturing protocol
• Final drawings, parts list, and testing protocol
• Prototype Fabricated: 4/6/04
• Testing Complete: 4/12/04
• Business Plan Complete: 4/14/04
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Team ResponsibilitiesAction Item Bachman Grindle McClure Morley
Pump Design Lead
Current pump evaluations X X X X
Solid modeling X
CFD if req. if req.
Cannula Design Lead
Evaluation of available cannulas X X X X
Solid modeling X X
CFD if req. if req.
Console Design X
Regulatory and QS X
HFE X X
Fabrication and Procurement
Pump X
Cannulas X
Console X
Prototype Evaluation X X X X
Business Plan X
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Acknowledgements
• Department of Bioengineering
• Dr. Frank Pigula
• Mr. Mark Gartner
• Ms. Sarah Wright