Stent-Saver
Senior Design Project: Stent-Saver
  • Eva Bica
  • Dominique Gonzalez
  • George Collard
  • Rebecca Gonter
  • Joseph Grogan


    • Menu Items:
    >Design

    Our Solution

    • A Remotely-Operated Stitching Device
    • Consists of three parts
      • Proximal Device
        • Front part to be inserted into patient to place spiral clips
      • Connection
        • Tube containing several tubes within it
      • Distal Device
        • Back end to be hand operated




    Breakdown Of Parts

    • Proximal Device
      • Delivers Nitinol Clips
      • Telescoping series of tubes
        • Four Tubes:
          • Tube 1: outermost, hard polyurethane
          • Tube 2: hard/springy nitinol bend (120 degrees)
          • Tube 3: soft straight nitinol, inner profile is oval, needle at top
          • Tube 4: innermost, soft polyurethane screw. Oval shape, which prevents nitinol clips from rotating, forcing them to translate upward Material: Nitinol and Polyurethane




    • Connection System
      • Translates Operation of Distal Device to Proximal Movement
      • Concentric Tubes
      • Material: Polyurethane



    • Distal Device
      • Hand-Held / Operated
      • 2 Dials, 2 Sliders
      • Internal Mechanisms Link Movements
      • Constructed of:
        • Plastic Casing and dials/sliders
        • Nylon and steel gears
      • Tubes pushed by sliders
      • Tubes rotated by dials
      • Gears link backwards motion of slider to rotation of screw



    Nitinol Clip Information

    • Purpose of clip
      • To secure stent-graft to aorta wall
      • To prevent leakage and slippage
    • Clip Selection
      • Oval spiral shape chosen because it had the strongest overallsupport
      • A series of clips will be placed to ensure safety and symmetry
      • Nitinol selected as material (FDA approved)
      • Clips are oriented in criss-cross manner to ensure a tighter hold

      


    Material Selection

    • Nitinol
      • Nickel Titanium alloy has shape memory properties (after being heated in a shape, that shape is retained)
      • Can undergo large elastic deformation

    • Polyurethane
      • Unique material that offers the elasticity of rubber combined with the toughness and durability of metal
      • Urethanes have better abrasion and tear resistance than rubbers, while offering higher load bearing capacity
      • FDA approved
      • Compatible with human body

    Reason for Development

    • To eliminate or greatly reduce the need for open surgery, which is very traumatic to the body
    • To increase the success rate of endovascular surgery over time
    • Providing a simple, safe, effective solution to the problem of leakage and slippage of endovascular stent-grafts
    • Patient saves money due to less follow up visits and eliminates need for additional procedures

     ©2004. Eva Bica, Dominique Gonzalez, George Collard, Rebecca Gonter, Joseph Grogran.