156B Week 5

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

• • Fabricating simplified first prototype in machine shop using EDM

  • Received shipment of simulated bone (Sawbones)

  • Continuing to make changes on design

Accomplishments from Previous Week

• • Performed insertion tests into Jello with multiple design iterations

  • Began fabrication of simplified prototype

Goals for Next Week (list names after each item). Use specific and measurable objectives

• • Finalize design

  • Finalize/Analyze simplified prototype

  • Fabricate scaled version out of metal (titanium), with more detail than simplified prototype

  • Change final scale of part to 2x scale

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments

• • Good improvement on the deployment test

    • The wings deployed in a way that created more contact with their surface area

  • Keep looking to see if the design can be made with peek

  • 3 Different types of test (can be done with different iterations of the anchor):

    • 1) test in Jello to show deployment motion

    • 2) test already deployed shape in sawbones with instron machine

    • 3) test final iteration: insert anchor into sawbones, then test with instron machine

  • Slightly concerned about sharp corners and how they interact with the suture in the simplified anchor assembly

Instructor Comments from Last Meeting and Actions Taken to Address these Comments

• • Look into methods of precision machining

    • Direct Metal Laser Sintering (DMLS/DMP) is likely the best option

      • Quote is still underway

    • Selective Laser Sintering

      • Complex Geometries

      • Have only seen nylon materials for manufacture; unknown if PEEK is an option

    • ED Machining

      • Needed simplified CAD model of part

      • Currently being manufactured

Risks and Areas of Concern

• • Ineffective prototypes

    • Will cause more delays in design

  • Dimensioning and scaling of anchor

    • 1.4mm diameter is too small. 2X scale is still competitive.

    • Product specs of anchors that are posted online may not be accurate.

Resources or Information Required but not Available

• • Cadavers

  • Porosity size of bone

  • Method of machining prototype (still determining how to drill suture holes)

  • Type of drilled hole for soft anchors (clearance or smaller hole where they shove in the inserter?)

Schedule

• • Manufacture anchor out of steel or titanium

Budget (list amount spent and amount remaining)

• • $240 spent

  • $860 remaining

Progress on Report and Webpage

• • Visuals added to webpage