156B Week 4 Progress

1. OVERVIEW AND PROJECT STATUS
  1. Fabricated Prototype of Designs
    1. Finger Trap (Gore-Tex)
    2. Clamp (3D Printed)
    3. Wrap (PDMS Composite)
  2. Began Testing Prototypes
2. LATEST ACCOMPLISHMENTS

- 1. Completed Design Proposal Presentation
  2. Completed All Required Lab Safety Training
  3. Fabricated Initial Design Prototypes
  4. Contacted Machine Shops with Micromills
    1. Larry Grissom - Calit2 nano3 Machine Shop
      1. Need to complete training process to use machine
  5. Contact Nanoengineering Faculty

- - 1. Dr. Vecchio - asked about use of MEMs
      1. Unable to provide assistance

- 1. Developed 2 new design ideas

- - 1. Strap-down idea
    2. heat shrink

1. GOALS FOR NEXT WEEK

- 1. Perform Tests on Prototypes
    1. Compare tensile forces need for slip (microbarb vs smooth)
    2. Compare tensile forces need for slip for various turns of screw on clamp
    3. Compare tensile forces at various weave elongations for finger trap
    4. Compare tensile forces needed for slip with various strap down lengths
  2. Narrow Down Material Considerations
  3. Purchase Required Materials
  4. Considerations for Attachment to Stainless Steel Backbone

1. SPONSOR COMMENTS

- 1. Effect of Nerve’s Stickiness on Friction
  2. Adding tire treads to help remove liquid may help but still need piercing elements to increase grip effectively
    1. Try for less fine, and more coarse overall surface roughness
    2. Less microbarb density, but greater overall height

1. INSTRUCTOR COMMENTS

- 1. Design Proposal Presentation Comments
    1. Explanation of curved shape for Finger Trap (when extended)
    2. Dental floss for material consideration for Finger Trap
      1. looking into waxless dental floss
    3. Design a hinge on one side of the Clamp such that there will be only one screw required
    4. Ease of tying sutures for PDMS Composite Wrap design
    5. Boundary conditions for non-linear FEA

1. CURRENT PROJECT RISKS

- 1. Need to Find Biocompatible High Friction Materials
  2. Methods to Bond Gripping Mechanism to Stainless-Steel Backbone
  3. Need to Find Biocompatible with slow transient property degradation (Stiffness)
  4. Consider Size and Feasibility for Surgeon

1. NEEDED RESOURCES AND INFORMATION

- 1. Micro-machining Information
    1. Need to find resources on how to machine on our small scale
  2. Accessibility of proposed materials
  3. How well can the body handle heat (for heat shrink)

1. UPCOMING MILESTONES

- 1. First Draft of Report (May 1st)
  2. Set-up Team Homepage with Graphics and Introductory Text (May 1st)
  3. Proof of Concept Presentation (May 7th)

1. BUDGET UPDATE

- 1. $1000 Parts Budget Remaining ($1000 Starting Budget)
    1. $60.78 spent for UHD 3D Printer ($100 provided)
      1. Rate: $0.30 for model material, $0.60 for support material (all per gram)
    2. $9.72 spent for lower-res 3D Printer ($100 provided)

- - - 1. Rate: $5.20 per cubic inch of material combined

- 1. 1. $*Fabian input number* spent for presentation printing ($401.33 provided by class)

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