156B Week 7

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

• • Fabricated simplified first two prototypes in machine shop using EDM

    • 1 x scale

    • 2x scale (has suture holes in wings)

  • Have made design without suture holes

    • Has one suture to go through entire anchor and will have a knot at the end and a tip to hold the knot

    • Fabricated anchor at 1x scale

    • Will make 3 more by next Monday

    • Will fabricate tip piece

  • Have evaluated testing area and drill press available at sponsor’s location

    • Will test tomorrow

  • Got training on Instron machine

Accomplishments from Previous Week

• • Have physical prototypes made from titanium

  • Have an easy to manufacture design that eliminates need for suture holes

  • Flexure Hinge Analysis

  • We have the test setup jigs ready

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

• • Finalize design

  • Finalize/Analyze simplified prototype

  • Fabricate multiple anchors

  • Test on instron machine

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

• • More confident with new design

    • Easier to manufacture, simpler insertion method

  • Locking mechanism for anchor to tip piece

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

• • Try to make a design that doesn’t need suture holes

    • Suture holes will take away from the structural integrity

    • Difficult to make holes on rounded surface

  • We made a design that doesn’t need suture holes

    • No update yet

  • Should meet with surgeon again (Anshu)

    • Compiled questions

Risks and Areas of Concern

• • Tom said he needs to focus on other groups now

    • Manufacturing is up to us

  • 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.

    • Assembling another list of questions for our surgical consult

  • Wing deployment in simulated bone

    • May need a lot of force to open

Resources or Information Required but not Available

• • Cadavers

  • Porosity size of bone

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

    • Will be included in previously mentioned list of questions for surgeon

Schedule

• • Manufacture new prototype design out of titanium

  • Test in Sawbones

Budget (list amount spent and amount remaining)

• • $245 spent

  • $855 remaining

Progress on Report and Webpage

• • Visuals added to webpage